--- title: 3 Easy Ways To Stop Your Purging Compound From Leaving Residue description: Discover 3 simple but highly effective ways to prevent your purging compound from leaving behind residue, ensuring resin transitions are quick and clean. image: https://www.asaclean.com/hubfs/Residue%20Blog%20Header.jpg --- [ 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 - 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[Twitter Tweet ](https://twitter.com/intent/tweet?url=https%3A%2F%2Fwww.asaclean.com%2Fblog%2F3-easy-ways-to-stop-your-purging-compound-from-leaving-residue&text=3+Easy+Ways+To+Stop+Your+Purging+Compound+From+Leaving+Residue) - [LinkedIn Share ](https://www.linkedin.com/shareArticle?mini=true&url=https%3A%2F%2Fwww.asaclean.com%2Fblog%2F3-easy-ways-to-stop-your-purging-compound-from-leaving-residue&title=3%20Easy%20Ways%20To%20Stop%20Your%20Purging%20Compound%20From%20Leaving%20Residue&summary=Discover+3+simple+but+highly+effective+ways+to+prevent+your+purging+compound+from+leaving+behind+residue%2C+ensuring+resin+transitions+are+quick+and+clean.&source=) - [Pinterest Pin ](https://pinterest.com/pin/create/button/?url=https%3A%2F%2Fwww.asaclean.com%2Fblog%2F3-easy-ways-to-stop-your-purging-compound-from-leaving-residue) - [Email Email ](mailto:?subject=3%20Easy%20Ways%20To%20Stop%20Your%20Purging%20Compound%20From%20Leaving%20Residue&body=https%3A%2F%2Fwww.asaclean.com%2Fblog%2F3-easy-ways-to-stop-your-purging-compound-from-leaving-residue) ![3 Easy Ways To Stop Your Purging Compound From Leaving Residue](https://www.asaclean.com/hs-fs/hubfs/Residue%20Blog%20Header.jpg?width=640&height=500&name=Residue%20Blog%20Header.jpg) ![3_Easy_Ways_To_Stop_Your_Purging_Compound_From_Leaving_Residue.jpg](https://www.asaclean.com/hs-fs/hubfs/3_Easy_Ways_To_Stop_Your_Purging_Compound_From_Leaving_Residue.jpg?width=307&name=3_Easy_Ways_To_Stop_Your_Purging_Compound_From_Leaving_Residue.jpg "3_Easy_Ways_To_Stop_Your_Purging_Compound_From_Leaving_Residue.jpg")As a plastics processing company, you know that contamination and resin purging residue are costly, both in the amount of product that cannot be sold and the resulting production downtime between resin transitions. You need a purging compound that allows you to transition from one color to another quickly, so your production runs are smooth and on schedule. With the [right purging compound and purging process](https://asaclean.com/why-asaclean/), contamination, scrap rate and production downtime are controlled or completely eliminated. The following are three simple ways to prevent your resin transitions from leaving residue and contamination, ensuring scrap rate and downtime are no longer an issue: **1. Apply The Proper Purging Compound Grade** The melt index (MI) of your resins is a major factor in purging residue issues, especially if the purge is much stiffer than the next resin. MI is the first characteristic to consider when selecting a purging compound that’s going to effectively purge resins and contamination. [A low-residue purging compound application](https://www.asaclean.com/solutions/residue-and-clear-resins) is needed if your MI is high, while [a glass-filled purging compound grade](https://www.asaclean.com/purging-products/ex-grade) may be necessary to flush out contamination. If contamination exists, purge first with the glass-filled purging compound grade (please note: this is for the screw and barrel only), and then follow with the low-residue grade prior to transitioning to the next resin. If no contamination exists, just use the low-residue grade. **2. Use The Recommended Temperature Range For The Purging Process** Purging process temperature and MI are the most consistent indicators of how to successfully eliminate residue. That’s why it’s critical to use the recommended temperature range for the purging compound and resin. If you use a purging compound that is not designed for a specific temperature range, it may stiffen and leave behind residue. For example, low-temperature resins, such as PVC, require a purging compound specifically designed to run at lower temperatures. **3. Be Aggressive When Displacing The Purge** When purging resins, you may be worried about using too forceful of screw speeds or back pressure. While your concern is founded, some assertiveness may be needed when purging certain resins like Bayer’s Texin, Desmopan (TPU) and Makrolon (PC). If you’re experiencing issues with residue when changing production resins, low-to-medium back pressure and screw speeds are often to blame. To help minimize residue, follow these easy but effective steps: **For Injection Molding** - Keep the screw in the full forward position by increasing backpressure to the maximum safe level. - Increase the screw speed to the highest safe level once the barrel is full of the production resin. - Once the production resin is free of the purging compound residue, drop the backpressure and perform short, high-velocity injection shots. **For Extrusion** - Plug any vents on the barrel. - Leave a breaker plate in place to create some back pressure in the barrel. - Use the highest screw speed available on the extruder without tripping out the motor. With the cleaning power of a proper purging compound and purging process for your resin transitions, preventing residue is easy for your crew. Using the right purging procedures helps you gain back machine capacity and experience a significant scrap rate reduction. Contamination is eliminated, your residue issues are resolved and your production runs are smooth and efficient as you switch from color to color on one machine. **Ready to learn more about how to achieve successful resin transitions without residue? Discover why purging compounds and process efficiency must work in tandem.** [![](https://www.asaclean.com/hubfs/images/asaclean_nro3_cover.png) Strengthen Your Bottom Line By Pairing Purging Compounds & Process Improvement Download Your Free Guide ](https://cta-service-cms2.hubspot.com/web-interactives/public/v1/track/click?encryptedPayload=AVxigLIPAElnNDhlj1Hztj2cSZRs0TXIP33K5e6OUSZQrlFPYwOJzwFXtC%2BXZW6foctYZiIGPijfCwCAmxGtkjB0JjA%2BEIN7faxu6BSusk6lrzktHFFPxqZJFMiLq1RcCeojLdHPsxEy8K1Az%2F3Tmies8Ypd9BccTcxmoRxOePc2nC69ub4YL0xF1zeywST2rACml7tTkG5sME9aWkcXg%2B%2FI8pvFB6ZUyIgq&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 [![4 Tips for Faster Changeovers and Reduced Downtime](https://www.asaclean.com/hs-fs/hubfs/Asaclean%20Watching%20Clock.jpg?width=450&height=250&name=Asaclean%20Watching%20Clock.jpg) 4 Tips for Faster Changeovers and Reduced Downtime Purging Tips / 4 min read / February 16, 2021 ](https://www.asaclean.com/blog/4-tips-for-faster-changeovers-and-reduced-downtime) [![4 Ways To Avoid Production Downtime And Achieve Fast Resin Transitions](https://www.asaclean.com/hs-fs/hubfs/AI-Generated%20Media/Images/This%20image%20depicts%20a%20business%20person%20watching%20a%20clock-1.jpeg?width=450&height=250&name=This%20image%20depicts%20a%20business%20person%20watching%20a%20clock-1.jpeg) 4 Ways To Avoid Production Downtime And Achieve Fast Resin Transitions Injection... / 3 min read / July 05, 2016 ](https://www.asaclean.com/blog/4-ways-to-avoid-production-downtime-and-achieve-fast-resin-transitions) ## Comments Get Started ## Ready to start improving your efficiency and increasing your profitability? - [Request a Consultation](https://www.asaclean.com/blog/3-easy-ways-to-stop-your-purging-compound-from-leaving-residue#) - [Contact Sales](https://www.asaclean.com/blog/3-easy-ways-to-stop-your-purging-compound-from-leaving-residue#) ![](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) [ Back to Top ](https://www.asaclean.com/blog/3-easy-ways-to-stop-your-purging-compound-from-leaving-residue#top) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Tom Hanvey", "url" : "https://www.asaclean.com/blog/author/tom-hanvey" }, "dateModified" : "2025-05-13T14:11:20.109Z", "datePublished" : "2016-12-20T12:42:00.000Z", "headline" : "3 Easy Ways To Stop Your Purging Compound From Leaving Residue", "image" : [ "https://www.asaclean.com/hubfs/Residue%20Blog%20Header.jpg" ], "mainEntityOfPage" : { "@id" : "https://www.asaclean.com/blog/3-easy-ways-to-stop-your-purging-compound-from-leaving-residue", "@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" : "As a plastics processing company, you know that contamination and resin purging residue are costly, both in the amount of product that cannot be sold and the resulting production downtime between resin transitions. You need a purging compound that allows you to transition from one color to another quickly, so your production runs are smooth and on schedule. With the right purging compound and purging process, contamination, scrap rate and production downtime are controlled or completely eliminated. The following are three simple ways to prevent your resin transitions from leaving residue and contamination, ensuring scrap rate and downtime are no longer an issue:", "author" : { "@type" : "Person", "name" : "Tom Hanvey" }, "datePublished" : "December 20, 2016", "headline" : "3 Easy Ways To Stop Your Purging Compound From Leaving Residue", "image" : "https://468726.fs1.hubspotusercontent-na1.net/hubfs/468726/Residue%20Blog%20Header.jpg", "name" : "3 Easy Ways To Stop Your Purging Compound From Leaving Residue", "url" : "https://www.asaclean.com/blog/3-easy-ways-to-stop-your-purging-compound-from-leaving-residue" } ```