---
title: "Purging Compounds For Blow Molding: What You Need To Know"
description: Prevent costly contamination in blow molding machines—learn how to select and apply the right purging compound to protect quality and profitability.
image: https://www.asaclean.com/hubfs/assets/images/images/ebook-resource-cards/best-purge-compound-400x200.jpg
---

![Asaclean Purging Compound logo](https://www.asaclean.com/hubfs/assets/images/logos/asahi-kasei-logo-white.svg)

 Search

- [Asaclean® Blog](https://www.asaclean.com/blog)
- [Request Free Consultation](https://offers.asaclean.com/free-purge-consultation)
- [Support](https://www.asaclean.com/support)

EN

- [EN](https://www.asaclean.com/?hsLang=en)
- [SP](https://www.asaclean.com/es/blog)

[![Asaclean Purging Compound logo](https://www.asaclean.com/hubfs/assets/images/logos/asaclean-logo.svg) ](https://www.asaclean.com)

- Why Purge?
  
  
  
  ### Why Purge?
  
  Purging Compounds are an easy-to-use and affordable way to dramatically reduce scrap & downtime in plastics manufacturing. But how do you know if purging compounds are right for you?
  
  Learn why purging compounds are so important and see how Asaclean® helps your entire team succeed.
  
  Our Purging Experts answer frequently asked questions and address topics that benefit Process Technicians, Maintenance teams, Buyers, and even Plant Managers.
  
  [Learn more](https://www.asaclean.com/about-purging-compounds)
  
  
  
    - [Schedule a Free 10-Minute Consultation](https://offers.asaclean.com/free-purge-consultation)
    - [Get a Free Sample](https://offers.asaclean.com/free-sample)
  
  
  
  
  #### Purging 101
  
  Our in-depth guide tells you everything you need to know about purging compounds. We want to give you the tools you need to make the best decision for your processing needs..
  
  [Explore our in-depth guide](https://www.asaclean.com/ultimate-guide-to-purge-compounds)
  
   
  
  
  
    - [ Why Purging Compounds? ](https://www.asaclean.com/en/about-purging-compounds)
    - [ Purging 101 ](https://www.asaclean.com/ultimate-guide-to-purge-compounds)
    - [ Cost Savings Calculator ](https://www.asaclean.com/cost-savings-calculator)
  
  
  [
  
  
  
  
  
  ![cost-savings-calculator-white](https://www.asaclean.com/hubfs/assets/images/ui/cost-savings-calculator-white.svg)
  
  ### Cost Savings Calculator
  
  Use our free calculator to see how much you will save with Asaclean® Purging Compounds.
  
   See the savings 
  
  
  
  ](https://www.asaclean.com/cost-savings-calculator)
- Cost Saving Solutions
  
  
  
  ### Cost Savings Solutions
  
  Our singular focus is saving your facility save time and money.
  
  Asaclean® helps injection molders, extruders, and blow molders dramatically reduce scrap and downtime.   
  Whether you’re struggling with hot runner color changeovers, costly screw pulls, or holding a bubble in blown-film extrusion, we have the solution to your problems.
  
  Asaclean® Purging Compounds are engineered to tackle your hardest processing challenges and make an incredible difference in your process efficiency.
  
  Here are some of the ways we can help you save:
  
  [Learn more](https://www.asaclean.com/solutions)
  
  
  
    - [Schedule a Free 10-Minute Consultation](https://offers.asaclean.com/free-purge-consultation)
    - [Get a Free Sample](https://offers.asaclean.com/free-sample)
  
  
  
  
    - [ Color Changeovers & Contamination ](https://www.asaclean.com/solutions/color-changeovers)
    - [ Material Changeovers & Contamination ](https://www.asaclean.com/solutions/material-changeovers)
    - [ Black Specks/Carbon Contamination ](https://www.asaclean.com/solutions/carbon-contamination)
    - [ Preventative Purging ](https://www.asaclean.com/solutions/preventative-purging)
    - [ Screw Pulls ](https://www.asaclean.com/solutions/screw-pulls)
    - [ High & Low Temperature Changeovers ](https://www.asaclean.com/solutions/high-and-low-temp-changeovers)
    - [ Residue Issues/Clear Resins ](https://www.asaclean.com/solutions/residue-and-clear-resins)
    - [ Shutdown & Sealing ](https://www.asaclean.com/solutions/shutdown-and-sealing)
    - [ Customized Purge Programs ](https://www.asaclean.com/solutions/custom-purge-programs)
    - [ Free Purge Consultation ](https://offers.asaclean.com/free-purge-consultation)
  
  
  [
  
  
  
  
  
  ![cost-savings-calculator-white](https://www.asaclean.com/hubfs/assets/images/ui/cost-savings-calculator-white.svg)
  
  ### Cost Savings Calculator
  
  Use our free calculator to see how much you will save with Asaclean® Purging Compounds.
  
   See the savings 
  
  
  
  ](https://www.asaclean.com/cost-savings-calculator)
- Process & Industry
  
  
  
  ## Process and Industry
  
  With over 2,000 current customers and a combined 200+ years of processing experience, we’ve seen it all. Asaclean® understands your priorities and has excellent cost savings solutions specific to your process and industry.
  
  [Learn more](https://www.asaclean.com/process-industry)
  
  
  
    - <https://www.asaclean.com/blog/purging-compounds-for-blow-molding-what-you-need-to-know#>[Schedule a Free 10-Minute Consultation](https://offers.asaclean.com/free-purge-consultation)
    - [Grade Selection Guide](https://www.asaclean.com/grade-selection-guide)
    - [Get a Free Sample](https://offers.asaclean.com/free-sample)
  
  
  
  
    - [ Industries ](https://www.asaclean.com/industry) 
          - [ Automotive ](https://www.asaclean.com/en/industry/automotive)
          - [ Custom Molders ](https://www.asaclean.com/industry/custom-molders)
          - [ Consumer Products ](https://www.asaclean.com/industry/consumer-products)
          - [ Electronic ](https://www.asaclean.com/industry/electronics)
          - [ Packaging ](https://www.asaclean.com/industry/packaging)
          - [ Medical ](https://www.asaclean.com/industry/medical)
          - [ General Industrial ](https://www.asaclean.com/industry/industrial)
          - [ Aerospace ](https://www.asaclean.com/industry/aerospace)
          - [ Other Industries ](https://www.asaclean.com/industry/other)
          - [ See All Industries ](https://www.asaclean.com/industry)
    - [ Process ](https://www.asaclean.com/process) 
          - [ Injection Molding ](https://www.asaclean.com/process/injection-molding)
          - [ General Extrusion ](https://www.asaclean.com/process/general-extrusion)
          - [ Film Extrusion ](https://www.asaclean.com/process/film-extrusion)
          - [ Sheet Extrusion ](https://www.asaclean.com/process/sheet-extrusion)
          - [ Wire/Tubing ](https://www.asaclean.com/process/wire-tube-pipe-extrusion)
          - [ Compounding ](https://www.asaclean.com/process/compounding)
          - [ Blow Molding ](https://www.asaclean.com/process/blow-molding)
          - [ See All Processes ](https://www.asaclean.com/process)
- [Purging Products ](https://www.asaclean.com/purging-products) 
    - [**Purging Products** ](https://www.asaclean.com/purging-products)
    - [ Mechanical Purging Compounds ](https://www.asaclean.com/purging-products/mechanical-purging-compounds)
    - [ Chemical Purging Compounds ](https://www.asaclean.com/purging-products/chemical-purging-compounds)
    - [ Purging Concentrates ](https://www.asaclean.com/purging-products/purge-concentrates)
- Resources
  
  
  
  ## Resources
  
  Learn how processors at over 2,000 manufacturing locations in North and South America use Asaclean® to cut scrap rates, reduce downtime, and transform their process efficiency.
  
  [See all resources](https://www.asaclean.com/resources)
  
  
  
    - [Cost Savings Calculator](https://www.asaclean.com/cost-savings-calculator)
    - [Schedule a Free 10-Minute Consultation](https://offers.asaclean.com/free-purge-consultation)
    - [Get a Free Sample](https://offers.asaclean.com/free-sample)
  
  
  
  
    - [ Customer Resources ](https://www.asaclean.com/resources#customer-resources) 
          - [ Purging Instructions ](https://www.asaclean.com/resources/purging-instructions)
          - [ Grade Technical Documentation ](https://www.asaclean.com/resources/grade-documentation)
          - [ Certifications & Compliance Documents ](https://www.asaclean.com/resources#certifications)
          - [ Training Videos ](https://www.asaclean.com/resources/training-videos)
          - [ Purging & Plastics Processing Tips ](https://www.asaclean.com/blog)
          - [ FAQs ](https://www.asaclean.com/frequently-asked-questions)
    - [ Other Resources ](https://www.asaclean.com/resources#other-resources) 
          - [ Cost Savings Calculator ](https://www.asaclean.com/cost-savings-calculator)
          - [ Grade Selection Guide ](https://www.asaclean.com/grade-selection-guide)
          - [ eBooks & White Papers ](https://www.asaclean.com/resources/ebooks)
          - [ Case Studies ](https://www.asaclean.com/case-studies)
          - [ Webinars ](https://www.asaclean.com/resources/webinars)
          - [ Testimonials ](https://www.asaclean.com/customer-testimonials)
  
  
  [
  
  
  
  
  
  ![grade-selection-guide](https://www.asaclean.com/hubfs/assets/images/ui/white/grade-selection-guide.svg)
  
  ### Grade Selection Guide
  
  Use our Grade Selection Guide to receive personalized Asaclean® product recommendations based on your goals & processing information.
  
   Use the guide 
  
  
  
  ](https://www.asaclean.com/grade-selection-guide)
- [About Us ](https://www.asaclean.com/about-us) 
    - [**About Us** ](https://www.asaclean.com/about-us)
    - [ About Asaclean® ](https://www.asaclean.com/about-us)
    - [ The Asaclean® Difference ](https://www.asaclean.com/about-us/the-asaclean-difference)
    - [ The Asaclean® Guarantee ](https://www.asaclean.com/about-us/the-asaclean-guarantee)
    - [ About Asahi Kasei Plastics North America ](https://www.asaclean.com/about-us/asahi-kasei-plastics-north-america)
    - [ About Asahi Kasei Group ](https://www.asaclean.com/about-us/asahi-kasei-group)
    - [ Articles ](https://www.asaclean.com/about-us/articles)
    - [ Sustainability ](https://www.asaclean.com/about-us/sustainability)

[ Order Online ](https://asaclean.my.site.com/b2bstore) [ Free Sample ](https://offers.asaclean.com/free-sample)

EN

- [EN](https://www.asaclean.com/?hsLang=en)
- [SP](https://www.asaclean.com/es/blog)

 Search

[Resources ](https://www.asaclean.com/resources)

Menu

- Why Purge? 
    - [Why Purging Compounds?](https://www.asaclean.com/en/about-purging-compounds)
    - [Purging 101](https://www.asaclean.com/ultimate-guide-to-purge-compounds)
    - [Cost Savings Calculator](https://www.asaclean.com/cost-savings-calculator)
- [Cost Saving Solutions](https://www.asaclean.com/solutions) 
    - [Color Changeovers & Contamination](https://www.asaclean.com/solutions/color-changeovers)
    - [Material Changeovers & Contamination](https://www.asaclean.com/solutions/material-changeovers)
    - [Black Specks/Carbon Contamination](https://www.asaclean.com/solutions/carbon-contamination)
    - [Preventative Purging](https://www.asaclean.com/solutions/preventative-purging)
    - [Screw Pulls](https://www.asaclean.com/solutions/screw-pulls)
    - [High & Low Temperature Changeovers](https://www.asaclean.com/solutions/high-and-low-temp-changeovers)
    - [Residue Issues/Clear Resins](https://www.asaclean.com/solutions/residue-and-clear-resins)
    - [Shutdown & Sealing](https://www.asaclean.com/solutions/shutdown-and-sealing)
    - [Customized Purge Programs](https://www.asaclean.com/solutions/custom-purge-programs)
    - [Free Purge Consultation](https://offers.asaclean.com/free-purge-consultation)
- [Process & Industry](https://www.asaclean.com/process-industry) 
    - [Industries](https://www.asaclean.com/industry) 
          - [Automotive](https://www.asaclean.com/en/industry/automotive)
          - [Custom Molders](https://www.asaclean.com/industry/custom-molders)
          - [Consumer Products](https://www.asaclean.com/industry/consumer-products)
          - [Electronic](https://www.asaclean.com/industry/electronics)
          - [Packaging](https://www.asaclean.com/industry/packaging)
          - [Medical](https://www.asaclean.com/industry/medical)
          - [General Industrial](https://www.asaclean.com/industry/industrial)
          - [Aerospace](https://www.asaclean.com/industry/aerospace)
          - [Other Industries](https://www.asaclean.com/industry/other)
          - [See All Industries](https://www.asaclean.com/industry)
    - [Process](https://www.asaclean.com/process) 
          - [Injection Molding](https://www.asaclean.com/process/injection-molding)
          - [General Extrusion](https://www.asaclean.com/process/general-extrusion)
          - [Film Extrusion](https://www.asaclean.com/process/film-extrusion)
          - [Sheet Extrusion](https://www.asaclean.com/process/sheet-extrusion)
          - [Wire/Tubing](https://www.asaclean.com/process/wire-tube-pipe-extrusion)
          - [Compounding](https://www.asaclean.com/process/compounding)
          - [Blow Molding](https://www.asaclean.com/process/blow-molding)
          - [See All Processes ](https://www.asaclean.com/process)
- [Purging Products](https://www.asaclean.com/purging-products) 
    - [Mechanical Purging Compounds](https://www.asaclean.com/purging-products/mechanical-purging-compounds)
    - [Chemical Purging Compounds](https://www.asaclean.com/purging-products/chemical-purging-compounds)
    - [Purging Concentrates](https://www.asaclean.com/purging-products/purge-concentrates)
- [Resources](https://www.asaclean.com/resources) 
    - [Customer Resources](https://www.asaclean.com/resources#customer-resources) 
          - [Purging Instructions](https://www.asaclean.com/resources/purging-instructions)
          - [Grade Technical Documentation](https://www.asaclean.com/resources/grade-documentation)
          - [Certifications & Compliance Documents](https://www.asaclean.com/resources#certifications)
          - [Training Videos](https://www.asaclean.com/resources/training-videos)
          - [Purging & Plastics Processing Tips](https://www.asaclean.com/blog)
          - [FAQs](https://www.asaclean.com/frequently-asked-questions)
    - [Other Resources](https://www.asaclean.com/resources#other-resources) 
          - [Cost Savings Calculator](https://www.asaclean.com/cost-savings-calculator)
          - [Grade Selection Guide](https://www.asaclean.com/grade-selection-guide)
          - [eBooks & White Papers](https://www.asaclean.com/resources/ebooks)
          - [Case Studies](https://www.asaclean.com/case-studies)
          - [Webinars](https://www.asaclean.com/resources/webinars)
          - [Testimonials](https://www.asaclean.com/customer-testimonials)
- [About Us](https://www.asaclean.com/about-us) 
    - [About Asaclean®](https://www.asaclean.com/about-us)
    - [The Asaclean® Difference](https://www.asaclean.com/about-us/the-asaclean-difference)
    - [The Asaclean® Guarantee](https://www.asaclean.com/about-us/the-asaclean-guarantee)
    - [About Asahi Kasei Plastics North America](https://www.asaclean.com/about-us/asahi-kasei-plastics-north-america)
    - [About Asahi Kasei Group](https://www.asaclean.com/about-us/asahi-kasei-group)
    - [Articles](https://www.asaclean.com/about-us/articles)
    - [Sustainability](https://www.asaclean.com/about-us/sustainability)

[ Order Online ](https://asaclean.my.site.com/b2bstore) [ Free Sample ](https://offers.asaclean.com/free-sample)

## [ Asaclean Blog ](https://www.asaclean.com/blog)

 Browse by Topic " aerospace asaclean asaclean news Asaclean® benefits asahi kasei automotive Best Practices black specks blisters blow molding blown-film extrusion buyers caps and closures carbon contamination cast-film extrusion Chemical Purging Compounds clear applications Color Changeovers Company News compounding consumer products contamination Cost savings custom molders Customer Success Story decreasing scrap defects electronics Energy Efficiency EX Grade extruder cleaning Extrusion fillament glass filled Glitter Grade Selection HDPE High and Low Temp Changeovers hold a bubble Hot Runners Injection Molding Injection Molding Tips LDPE Lightweight automotive components LLDPE low residue maintenance Material Changeovers Mechanical Purging Compounds medical Melt Flow Index NPE 24 nylons on the fly packaging PCR PEEK Polypropylene Post Consumer Resins preventative preventative purging processing tips profile extrusion Purge Program purge programs Purge Training Purge Trial purging purging compounds purging concentrates purging procedures Purging Tips quality recycled resins residue issues scrap reduction Screw Pulls sheet extrusion shutdown and sealing start-up super engineering resins Sustainability Tech Day technical support training trials Troubleshooting Twin Screw twin screw extrusion two step purging U Grade ULTEM venting Viscosity webinars wire extrusion

- [All](https://www.asaclean.com/blog/page/1)
- More
  
    - [aerospace](https://www.asaclean.com/blog/topic/aerospace)
    - [asaclean](https://www.asaclean.com/blog/topic/asaclean)
    - [asaclean news](https://www.asaclean.com/blog/topic/asaclean-news)
    - [Asaclean® benefits](https://www.asaclean.com/blog/topic/asaclean-benefits)
    - [asahi kasei](https://www.asaclean.com/blog/topic/asahi-kasei)
    - [automotive](https://www.asaclean.com/blog/topic/automotive)
    - [Best Practices](https://www.asaclean.com/blog/topic/best-practices)
    - [black specks](https://www.asaclean.com/blog/topic/black-specks)
    - [blisters](https://www.asaclean.com/blog/topic/blisters)
    - [blow molding](https://www.asaclean.com/blog/topic/blow-molding)
    - [blown-film extrusion](https://www.asaclean.com/blog/topic/blown-film-extrusion)
    - [buyers](https://www.asaclean.com/blog/topic/buyers)
    - [caps and closures](https://www.asaclean.com/blog/topic/caps-and-closures)
    - [carbon contamination](https://www.asaclean.com/blog/topic/carbon-contamination)
    - [cast-film extrusion](https://www.asaclean.com/blog/topic/cast-film-extrusion)
    - [Chemical Purging Compounds](https://www.asaclean.com/blog/topic/chemical-purging-compounds)
    - [clear applications](https://www.asaclean.com/blog/topic/clear-applications)
    - [Color Changeovers](https://www.asaclean.com/blog/topic/color-changeovers)
    - [Company News](https://www.asaclean.com/blog/topic/company-news)
    - [compounding](https://www.asaclean.com/blog/topic/compounding)
    - [consumer products](https://www.asaclean.com/blog/topic/consumer-products)
    - [contamination](https://www.asaclean.com/blog/topic/contamination)
    - [Cost savings](https://www.asaclean.com/blog/topic/cost-savings)
    - [custom molders](https://www.asaclean.com/blog/topic/custom-molders)
    - [Customer Success Story](https://www.asaclean.com/blog/topic/customer-success-story)
    - [decreasing scrap](https://www.asaclean.com/blog/topic/decreasing-scrap)
    - [defects](https://www.asaclean.com/blog/topic/defects)
    - [electronics](https://www.asaclean.com/blog/topic/electronics)
    - [Energy Efficiency](https://www.asaclean.com/blog/topic/energy-efficiency)
    - [EX Grade](https://www.asaclean.com/blog/topic/ex-grade)
    - [extruder cleaning](https://www.asaclean.com/blog/topic/extruder-cleaning)
    - [Extrusion](https://www.asaclean.com/blog/topic/extrusion)
    - [fillament](https://www.asaclean.com/blog/topic/fillament)
    - [glass filled](https://www.asaclean.com/blog/topic/glass-filled)
    - [Glitter](https://www.asaclean.com/blog/topic/glitter)
    - [Grade Selection](https://www.asaclean.com/blog/topic/grade-selection)
    - [HDPE](https://www.asaclean.com/blog/topic/hdpe)
    - [High and Low Temp Changeovers](https://www.asaclean.com/blog/topic/high-and-low-temp-changeovers)
    - [hold a bubble](https://www.asaclean.com/blog/topic/hold-a-bubble)
    - [Hot Runners](https://www.asaclean.com/blog/topic/hot-runners)
    - [Injection Molding](https://www.asaclean.com/blog/topic/injection-molding)
    - [Injection Molding Tips](https://www.asaclean.com/blog/topic/injection-molding-tips)
    - [LDPE](https://www.asaclean.com/blog/topic/ldpe)
    - [Lightweight automotive components](https://www.asaclean.com/blog/topic/lightweight-automotive-components)
    - [LLDPE](https://www.asaclean.com/blog/topic/lldpe)
    - [low residue](https://www.asaclean.com/blog/topic/low-residue)
    - [maintenance](https://www.asaclean.com/blog/topic/maintenance)
    - [Material Changeovers](https://www.asaclean.com/blog/topic/material-changeovers)
    - [Mechanical Purging Compounds](https://www.asaclean.com/blog/topic/mechanical-purging-compounds)
    - [medical](https://www.asaclean.com/blog/topic/medical)
    - [Melt Flow Index](https://www.asaclean.com/blog/topic/melt-flow-index)
    - [NPE 24](https://www.asaclean.com/blog/topic/npe-24)
    - [nylons](https://www.asaclean.com/blog/topic/nylons)
    - [on the fly](https://www.asaclean.com/blog/topic/on-the-fly)
    - [packaging](https://www.asaclean.com/blog/topic/packaging)
    - [PCR](https://www.asaclean.com/blog/topic/pcr)
    - [PEEK](https://www.asaclean.com/blog/topic/peek)
    - [Polypropylene](https://www.asaclean.com/blog/topic/polypropylene)
    - [Post Consumer Resins](https://www.asaclean.com/blog/topic/post-consumer-resins)
    - [preventative](https://www.asaclean.com/blog/topic/preventative)
    - [preventative purging](https://www.asaclean.com/blog/topic/preventative-purging)
    - [processing tips](https://www.asaclean.com/blog/topic/processing-tips)
    - [profile extrusion](https://www.asaclean.com/blog/topic/profile-extrusion)
    - [Purge Program](https://www.asaclean.com/blog/topic/purge-program)
    - [purge programs](https://www.asaclean.com/blog/topic/purge-programs)
    - [Purge Training](https://www.asaclean.com/blog/topic/purge-training)
    - [Purge Trial](https://www.asaclean.com/blog/topic/purge-trial)
    - [purging](https://www.asaclean.com/blog/topic/purging)
    - [purging compounds](https://www.asaclean.com/blog/topic/purging-compounds)
    - [purging concentrates](https://www.asaclean.com/blog/topic/purging-concentrates)
    - [purging procedures](https://www.asaclean.com/blog/topic/purging-procedures)
    - [Purging Tips](https://www.asaclean.com/blog/topic/purging-tips)
    - [quality](https://www.asaclean.com/blog/topic/quality)
    - [recycled resins](https://www.asaclean.com/blog/topic/recycled-resins)
    - [residue issues](https://www.asaclean.com/blog/topic/residue-issues)
    - [scrap reduction](https://www.asaclean.com/blog/topic/scrap-reduction)
    - [Screw Pulls](https://www.asaclean.com/blog/topic/screw-pulls)
    - [sheet extrusion](https://www.asaclean.com/blog/topic/sheet-extrusion)
    - [shutdown and sealing](https://www.asaclean.com/blog/topic/shutdown-and-sealing)
    - [start-up](https://www.asaclean.com/blog/topic/start-up)
    - [super engineering resins](https://www.asaclean.com/blog/topic/super-engineering-resins)
    - [Sustainability](https://www.asaclean.com/blog/topic/sustainability)
    - [Tech Day](https://www.asaclean.com/blog/topic/tech-day)
    - [technical support](https://www.asaclean.com/blog/topic/technical-support)
    - [training](https://www.asaclean.com/blog/topic/training)
    - [trials](https://www.asaclean.com/blog/topic/trials)
    - [Troubleshooting](https://www.asaclean.com/blog/topic/troubleshooting)
    - [Twin Screw](https://www.asaclean.com/blog/topic/twin-screw)
    - [twin screw extrusion](https://www.asaclean.com/blog/topic/twin-screw-extrusion)
    - [two step purging](https://www.asaclean.com/blog/topic/two-step-purging)
    - [U Grade](https://www.asaclean.com/blog/topic/u-grade)
    - [ULTEM](https://www.asaclean.com/blog/topic/ultem)
    - [venting](https://www.asaclean.com/blog/topic/venting)
    - [Viscosity](https://www.asaclean.com/blog/topic/viscosity)
    - [webinars](https://www.asaclean.com/blog/topic/webinars)
    - [wire extrusion](https://www.asaclean.com/blog/topic/wire-extrusion)

[ Subscribe ](https://www.asaclean.com/blog/purging-compounds-for-blow-molding-what-you-need-to-know#subscribe-modal)

### Suscribirse

 Purging Tips  / 5 min read  / September 06, 2016

# Purging Compounds For Blow Molding: What You Need To Know

- [Facebook Share ](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fwww.asaclean.com%2Fblog%2Fpurging-compounds-for-blow-molding-what-you-need-to-know)
- [Twitter Tweet ](https://twitter.com/intent/tweet?url=https%3A%2F%2Fwww.asaclean.com%2Fblog%2Fpurging-compounds-for-blow-molding-what-you-need-to-know&text=Purging+Compounds+For+Blow+Molding%3A+What+You+Need+To+Know)
- [LinkedIn Share ](https://www.linkedin.com/shareArticle?mini=true&url=https%3A%2F%2Fwww.asaclean.com%2Fblog%2Fpurging-compounds-for-blow-molding-what-you-need-to-know&title=Purging%20Compounds%20For%20Blow%20Molding%3A%20What%20You%20Need%20To%20Know&summary=Prevent+costly+contamination+in+blow+molding+machines%E2%80%94learn+how+to+select+and+apply+the+right+purging+compound+to+protect+quality+and+profitability.&source=)
- [Pinterest Pin ](https://pinterest.com/pin/create/button/?url=https%3A%2F%2Fwww.asaclean.com%2Fblog%2Fpurging-compounds-for-blow-molding-what-you-need-to-know)
- [Email Email ](mailto:?subject=Purging%20Compounds%20For%20Blow%20Molding%3A%20What%20You%20Need%20To%20Know&body=https%3A%2F%2Fwww.asaclean.com%2Fblog%2Fpurging-compounds-for-blow-molding-what-you-need-to-know)

![Purging Compounds For Blow Molding: What You Need To Know](https://www.asaclean.com/hs-fs/hubfs/assets/images/images/ebook-resource-cards/best-purge-compound-400x200.jpg?width=640&height=500&name=best-purge-compound-400x200.jpg)

![Purging_Compounds_For_Blow_Molding_What_You_Need_To_Know.jpg](https://www.asaclean.com/hs-fs/hubfs/Purging_Compounds_For_Blow_Molding_What_You_Need_To_Know.jpg?width=350&name=Purging_Compounds_For_Blow_Molding_What_You_Need_To_Know.jpg "Purging_Compounds_For_Blow_Molding_What_You_Need_To_Know.jpg")There are many different variations of blow molding, but all  can benefit from the use of commercial purging compounds.

In order to fight against color and carbon contamination, blow molding machines require the appropriate type and grade of purging compound and processes. Following specific purging tips and recommendations will help maintain high-quality products and minimize total purging costs.

Commercial purging compounds contain a base resin and other additives engineered to clean your screw, barrel and die. The two main types of compounds used are mechanical and chemical.

### **The Basics Of Mechanical ****Purging Compounds**

Most mechanical purging compounds rely on shear force in the barrel with simple physical adjustments of the machine and differences in material viscosities to clean machines. Some mechanical purges also rely on material affinity - they are attracted to carbon and other resins but not to metal so that they don’t stick to the screw and inner wall of the barrel. Unlike other types of compounds, mechanical purging compounds do not require time to soak because they do not clean by chemical reactions.

Unlike other types of purging compounds used specifically in certain environments, mechanical purges are effective across a wide variety of applications.

### **The Basics Of Chemical ****Purging Compounds**

Unlike mechanical types, these purging compounds clean your machine by the chemical reaction that occurs in the barrel and/or die when the purge is exposed to heat in your barrel. This kind of purge breaks the chemical bonds of the contaminants to help get rid of them.

Chemical purges require soak times of between five and 30 minutes, and often are aided by the inclusion of foaming agents.

Chemical purges are often more effective than mechanical purges in low-pressure and low flow environments.

### **How To Choose The Right ****Blow Molding** **Purging Compound**

To properly clean your blow molding machines, you must use the proper purging compound. First and foremost, the compound should have a similarly low melt index, which is better for resin compatibility.

The following are typical melt indices (MI or MFI) for blow molding resins:

- LDPE: <2g/10 min
- HDPE: <1g/10 min
- PP: <2g/10 min

If you’re using different resins, you may not necessarily use the same purging compound. You must purge between resin changes with the appropriate compound to completely clean your machine and prevent contamination.

### **How To Make The Most Of Purging**

To prevent layering of resins and contaminants in your barrel and head, reduce defects such as black specks, off-color or thin spots, and minimize costly screw pulls, purging *cannot* be a reactive measure.

Proactive maintenance is critical to maximizing your efficiency and profitability.

Sealing your screw and barrel eliminates the risk of degradation, which creates havoc (and kills your profitability) upon startups. Even throughout your production periods, you must periodically purge to protect against contamination.

Deposits that are just beginning to build are removable, but if they’re not purged soon enough, carbon forms and adheres to the metal. Without preventative purging, the carbon is encased by subsequent resin and will break off and contaminate your product.

With the proper purging compound – used as part of a proactive, preventative maintenance program – your blow molding machines are equipped to continuously produce high-quality products and help you maximize your bottom line.**** ****

**Talk to an expert to help you determine the proper purging compounds and processes for your business.**

[![](https://no-cache.hubspot.com/cta/default/468726/interactive-161641969972.png) ](https://www.asaclean.com/hs/cta/wi/redirect?encryptedPayload=AVxigLKJS4nQDWO2p88dSmFsWSqNbyVbM%2FoTz5uuJFKnZakHm6dEqKT8h06TL8lpIvRNuKOlGW3%2F2%2BJ9vf0v212F7Qct3C3IMgweJ%2BEydkYzAhojy%2Fqt1ZE3lEy2y8dCCZcNgHgN%2BFLdnNPDPkvCmr5%2Bjyfg%2BLHl19mEvYYsuQPaURBTg5KhvyR0cT%2B%2Bhw%3D%3D&webInteractiveContentId=161641969972&portalId=468726)

![Tom Hanvey](https://www.asaclean.com/hs-fs/hubfs/Tom%20Headshot.jpg?width=150&name=Tom%20Headshot.jpg)

#### [ Tom Hanvey ](https://www.asaclean.com/blog/author/tom-hanvey)

Tom Hanvey is the Associate Director of Marketing & Sustainability at Asahi Kasei Plastics North America. Before joining APNA, he worked as the Senior Marketing Manager for Asaclean Purging Compounds. He's worked in the plastics industry for over 10 years and focuses on recyclable resins and on the inbound marketing side, providing easy-to-digest content to processors looking for an edge on their competition.

- [Share On LinkedIn ](https://www.linkedin.com/in/thomashanvey/)

## Related Posts

[![Automotive molder inspecting an injection-molded, glass-filled part on the production floor for contamination and surface defects.](https://www.asaclean.com/hs-fs/hubfs/Automotive%20Nylon%20Blog%20Header.jpg?width=450&height=250&name=Automotive%20Nylon%20Blog%20Header.jpg)

Purging Compounds for Automotive Molders: Protecting OEM-Approved Programs from Contamination

 SCRAP REDUCTION  / 11 min read  / July 21, 2026 

](https://www.asaclean.com/blog/purging-compounds-for-automotive-molders-protecting-oem-approved-programs-from-contamination)

[![](https://www.asaclean.com/hs-fs/hubfs/AKAC%20Press%20Release%20Header-Mar-23-2022-09-31-16-12-PM.jpg?width=450&height=250&name=AKAC%20Press%20Release%20Header-Mar-23-2022-09-31-16-12-PM.jpg)

Asaclean® Purging Compound Maker Sun Plastech Promotes Joseph Serell to VP

 asaclean news  / 1 min read  / June 30, 2007 

](https://www.asaclean.com/blog/asaclean-sun-plastech-inc-announces-the-promotion-of-joseph-serell-to-vice-president-of-the-company)

## Comments

Get Started

## Ready to start improving your efficiency and increasing your profitability?

- [Request a Consultation](https://www.asaclean.com/blog/purging-compounds-for-blow-molding-what-you-need-to-know#)
- [Contact Sales](https://www.asaclean.com/blog/purging-compounds-for-blow-molding-what-you-need-to-know#)

![](https://www.asaclean.com/hubfs/assets/images/icons/icon-layers.svg)

#### Free Sample

Request a free sample of Asaclean® Purging Compounds for your plant and start saving today.

[Request your free sample](https://offers.asaclean.com/en/free-sample?hsLang=en)

![](https://www.asaclean.com/hubfs/assets/images/icons/icon-calculator.svg)

#### Cost Savings Calculator

Use our free calculator to see how much you could be saving with Asaclean® Purging Compounds.

[See your savings](https://www.asaclean.com/cost-savings-calculator)

- [Why Purge?](https://www.asaclean.com/en/about-purging-compounds) 
    - [Why Purging Compounds?](https://www.asaclean.com/en/about-purging-compounds)
    - [Purging 101](https://www.asaclean.com/ultimate-guide-to-purge-compounds)
    - [Cost Savings Calculator](https://www.asaclean.com/cost-savings-calculator)
- [Cost Saving Solutions](https://www.asaclean.com/solutions) 
    - [Color Changeovers & Contamination](https://www.asaclean.com/solutions/color-changeovers)
    - [Material Changeovers & Contamination](https://www.asaclean.com/solutions/material-changeovers)
    - [Black Specs/Carbon Contamination](https://www.asaclean.com/solutions/carbon-contamination)
    - [Preventative Purging](https://www.asaclean.com/solutions/preventative-purging)
    - [Screw Pulls](https://www.asaclean.com/solutions/screw-pulls)
    - [High & Low Temperature Changeovers](https://www.asaclean.com/solutions/high-and-low-temp-changeovers)
    - [Residue Issues/Clear Resins](https://www.asaclean.com/solutions/residue-and-clear-resins)
    - [Shutdown & Sealing](https://www.asaclean.com/solutions/shutdown-and-sealing)
    - [Customized Purge Programs](https://www.asaclean.com/solutions/custom-purge-programs)
    - [Free Purge Consultation](https://offers.asaclean.com/free-purge-consultation)
- [Industry](https://www.asaclean.com/industry) 
    - [Automotive](https://www.asaclean.com/en/industry/automotive)
    - [Custom Molders](https://www.asaclean.com/industry/custom-molders)
    - [Consumer Products](https://www.asaclean.com/industry/consumer-products)
    - [Packaging](https://www.asaclean.com/industry/packaging)
    - [Medical](https://www.asaclean.com/industry/medical)
    - [General Industrial](https://www.asaclean.com/industry/industrial)
    - [Aerospace](https://www.asaclean.com/industry/aerospace)
    - [Other Industries](https://www.asaclean.com/industry/other)
- [Process](https://www.asaclean.com/process) 
    - [Injection Molding](https://www.asaclean.com/process/injection-molding)
    - [Extrusion](https://www.asaclean.com/process/general-extrusion)
    - [Blow Molding](https://www.asaclean.com/process/blow-molding)
    - [Grade Selection Guide](https://www.asaclean.com/grade-selection-guide)
- [Purging Products](https://www.asaclean.com/purging-products) 
    - [Mechanical Purging Compounds](https://www.asaclean.com/purging-products/mechanical-purging-compounds)
    - [Chemical Purging Compounds](https://www.asaclean.com/purging-products/chemical-purging-compounds)
    - [Purging Concentrates](https://www.asaclean.com/purging-products/purge-concentrates)
- [Resources](https://www.asaclean.com/resources) 
    - [Processing Tips Blog](https://www.asaclean.com/blog)
    - [Customer Resources](https://www.asaclean.com/resources)
    - [Cost Savings Calculator](https://www.asaclean.com/cost-savings-calculator)
    - [Testimonials](https://www.asaclean.com/customer-testimonials)
    - [FAQs](https://www.asaclean.com/frequently-asked-questions)
- [About Us](https://www.asaclean.com/about-us) 
    - [About Asaclean®](https://www.asaclean.com/about-us)
    - [The Asaclean® Difference](https://www.asaclean.com/about-us/the-asaclean-difference)
    - [The Asaclean® Guarantee](https://www.asaclean.com/about-us/the-asaclean-guarantee)
    - [About Asahi Kasei Plastics North America](https://www.asaclean.com/about-us/asahi-kasei-plastics-north-america)
    - [About the Asahi Kasei Group](https://www.asaclean.com/about-us/asahi-kasei-group)
    - [Sustainability](https://www.asaclean.com/about-us/sustainability)

- [About Us](https://www.asaclean.com/about-us) 
    - [About Asaclean](https://www.asaclean.com/about-us)
    - [The Asaclean® Difference](https://www.asaclean.com/about-us/the-asaclean-difference)
    - [The Asaclean® Guarantee](https://www.asaclean.com/about-us/the-asaclean-guarantee)
    - [About Asahi Kasei Plastics North America](https://www.asaclean.com/about-us/asahi-kasei-plastics-north-america)
    - [About Asahi Kasei Group](https://www.asaclean.com/about-us/asahi-kasei-group)
    - [Sustainability](https://www.asaclean.com/about-us/sustainability)
- Need Help? 
    - [Schedule a Consultation](https://offers.asaclean.com/free-purge-consultation)
    - [Contact Us](https://www.asaclean.com/contact-us)
    - [Support](https://www.asaclean.com/support)

- [Facebook](https://www.facebook.com/AsacleanPurge)
- [LinkedIn](https://www.linkedin.com/company/asaclean-purging-compounds)
- [Twitter](https://twitter.com/ASACLEAN)

- [Privacy Policy](https://www.asaclean.com/privacy-policy)
- [Careers](https://www.asaclean.com/careers)
- [Find a Distributor](https://www.asaclean.com/find-a-distributor)

![Asaclean Purging Compound logo](https://www.asaclean.com/hubfs/assets/images/logos/asahi-kasei-logo-blue.svg)

©2026 Asahi Kasei Plastics North America. All rights reserved.

[ Back to Top ](https://www.asaclean.com/blog/purging-compounds-for-blow-molding-what-you-need-to-know#top)

```json
{
  "@context" : "https://schema.org",
  "@type" : "BlogPosting",
  "author" : {
    "@type" : "Person",
    "name" : "Tom Hanvey",
    "url" : "https://www.asaclean.com/blog/author/tom-hanvey"
  },
  "dateModified" : "2025-05-13T14:20:50.731Z",
  "datePublished" : "2016-09-06T12:00:00.000Z",
  "headline" : "Purging Compounds For Blow Molding: What You Need To Know",
  "image" : [ "https://www.asaclean.com/hubfs/assets/images/images/ebook-resource-cards/best-purge-compound-400x200.jpg" ],
  "mainEntityOfPage" : {
    "@id" : "https://www.asaclean.com/blog/purging-compounds-for-blow-molding-what-you-need-to-know",
    "@type" : "WebPage"
  },
  "publisher" : {
    "@type" : "Organization",
    "logo" : {
      "@type" : "ImageObject",
      "url" : "https://www.asaclean.com/hubfs/Asaclean%20Logo%20TM.jpg"
    },
    "name" : "Asahi Kasei Plastics North America"
  }
}
```

```json
{
  "@context" : "http://schema.org",
  "@type" : "Article",
  "articleBody" : "There are many different variations of blow molding, but all can benefit from the use of commercial purging compounds. In order to fight against color and carbon contamination, blow molding machines require the appropriate type and grade of purging compound and processes. Following specific purging tips and recommendations will help maintain high-quality products and minimize total purging costs.",
  "author" : {
    "@type" : "Person",
    "name" : "Tom Hanvey"
  },
  "datePublished" : "September 06, 2016",
  "headline" : "Purging Compounds For Blow Molding: What You Need To Know",
  "image" : "https://f.hubspotusercontent20.net/hubfs/468726/assets/images/images/ebook-resource-cards/best-purge-compound-400x200.jpg",
  "name" : "Purging Compounds For Blow Molding: What You Need To Know",
  "url" : "https://www.asaclean.com/blog/purging-compounds-for-blow-molding-what-you-need-to-know"
}
```