--- title: 4 Tips:Reduce Residue in Clear Applications for Injection & Extrusion description: Purging Expert Eric Despotovich discusses how to reduce residue when purging clear resins in injection molding and extrusion. image: https://www.asaclean.com/hubfs/asaclean%20sunglasses.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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[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/4-tipsreduce-residue-in-clear-applications-for-injection-extrusion#subscribe-modal) ### Suscribirse Troubleshooting / 2 min read / March 11, 2020 # 4 Tips:Reduce Residue in Clear Applications for Injection & Extrusion - [Facebook Share ](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fwww.asaclean.com%2Fblog%2F4-tipsreduce-residue-in-clear-applications-for-injection-extrusion) - [Twitter Tweet ](https://twitter.com/intent/tweet?url=https%3A%2F%2Fwww.asaclean.com%2Fblog%2F4-tipsreduce-residue-in-clear-applications-for-injection-extrusion&text=4+Tips%3AReduce+Residue+in+Clear+Applications+for+Injection+%26amp%3B+Extrusion) - [LinkedIn Share ](https://www.linkedin.com/shareArticle?mini=true&url=https%3A%2F%2Fwww.asaclean.com%2Fblog%2F4-tipsreduce-residue-in-clear-applications-for-injection-extrusion&title=4%20Tips%3AReduce%20Residue%20in%20Clear%20Applications%20for%20Injection%20%26amp%3B%20Extrusion&summary=Purging+Expert+Eric+Despotovich+discusses+how+to+reduce+residue+when+purging+clear+resins+in+injection+molding+and+extrusion.&source=) - [Pinterest Pin ](https://pinterest.com/pin/create/button/?url=https%3A%2F%2Fwww.asaclean.com%2Fblog%2F4-tipsreduce-residue-in-clear-applications-for-injection-extrusion) - [Email Email ](mailto:?subject=4%20Tips%3AReduce%20Residue%20in%20Clear%20Applications%20for%20Injection%20%26amp%3B%20Extrusion&body=https%3A%2F%2Fwww.asaclean.com%2Fblog%2F4-tipsreduce-residue-in-clear-applications-for-injection-extrusion) ![4 Tips:Reduce Residue in Clear Applications for Injection & Extrusion](https://www.asaclean.com/hs-fs/hubfs/asaclean%20sunglasses.jpg?width=640&height=500&name=asaclean%20sunglasses.jpg) ![beach-daylight-eyewear-1379247](https://www.asaclean.com/hs-fs/hubfs/beach-daylight-eyewear-1379247.jpg?width=271&name=beach-daylight-eyewear-1379247.jpg)    As most of you may know, when processing resins such as Polycarbonate, Acrylic, TPU or Co-polyesters you will most likely deal with black carbon specks at some point in the process. Most of you now know that you can remove this carbon with a quality purge compound, such as Asaclean’s [EX Grade](https://www.asaclean.com/purging-products/mechanical-purging-compound/ex-grade-purging-compound/) or the chemical [NCR Grade](https://www.asaclean.com/purging-products/asaclean-chemical-purging-grades/ncr-grade-purging-compound-formerly-supernova-regular/) instead of having to pull screws. The problem then becomes getting any residue from the machine in these clear applications.   **TIP #1-** A good tip to help eliminate milky white residue from your barrels is to be very aggressive with the screw speed behind the purge. **TIP #2-** For injection molding machines, this means keeping that screw forward with high back pressure and using high screw speeds with the next resin to come behind the purge. **TIP #3-** For [extrusion](https://www.asaclean.com/asaclean-chemical-purging-procedures/), plugging any vents on the barrel will help as well as leaving a breaker plate in place to create some back pressure in the barrel. It helps to use the highest screw speed available on the extruder without tripping out the motor. **TIP #4-** Using a low residue or clarifying grade of purge, such as Asaclean [E Grade ](https://www.asaclean.com/purging-products/mechanical-purging-compound/e-grade-purging-compound/)before the next clear resin will reduce or even eliminate any milky white residue for the next job. Again, one must be aggressive when purging in front of clear resins. **Ready to reduce your ****production downtime**** to protect your profits? Learn more about how ****purging compounds**** and process efficiency work in tandem.** ![Eric Despotovich](https://www.asaclean.com/hs-fs/hubfs/Eric%20Despotovich%20LinkedIn%20Headshot%202%20-%20Copy.jpg?width=150&name=Eric%20Despotovich%20LinkedIn%20Headshot%202%20-%20Copy.jpg) #### [ Eric Despotovich ](https://www.asaclean.com/blog/author/eric-despotovich) Eric Despotovich, an esteemed Asaclean Purging Expert and Technical Sales Representative, brings over 40 years of processing experience to his role. With over 18 years of dedication to our company, Eric has become a cornerstone of our sales team, renowned for his commitment to client success. His extensive industry knowledge and genuine passion for helping clients make him a trusted advisor in optimizing their operations. Eric's approach is characterized by deeply understanding each client's unique challenges, ensuring tailored solutions that drive efficiency and profitability. - [Share On LinkedIn ](https://www.linkedin.com/in/eric-despotovich-5449682b) ## Related Posts [![Super Engineering Resins and Hot Runner Manifolds](https://www.asaclean.com/hs-fs/hubfs/Super%20Engineering%20Hot%20Runner%20Tool%20Blog-1.jpg?width=450&height=250&name=Super%20Engineering%20Hot%20Runner%20Tool%20Blog-1.jpg) Super Engineering Resins and Hot Runner Manifolds Injection... / 2 min read / August 23, 2022 ](https://www.asaclean.com/blog/super-engineering-resins-and-hot-runner-manifolds) [![Asaclean UF2 Blown Film Use-2](https://www.asaclean.com/hs-fs/hubfs/Asaclean%20UF2%20Blown%20Film%20Use-2.jpg?width=450&height=250&name=Asaclean%20UF2%20Blown%20Film%20Use-2.jpg) Stop Running to Failure: A Tip for Extrusion Troubleshooting / 2 min read / November 22, 2019 ](https://www.asaclean.com/blog/stop-running-to-failure-a-tip-for-extrusion) ## Comments Get Started ## Ready to start improving your efficiency and increasing your profitability? - [Request a Consultation](https://www.asaclean.com/blog/4-tipsreduce-residue-in-clear-applications-for-injection-extrusion#) - [Contact Sales](https://www.asaclean.com/blog/4-tipsreduce-residue-in-clear-applications-for-injection-extrusion#) ![](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. 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[See your savings](https://www.asaclean.com/cost-savings-calculator) [ Back to Top ](https://www.asaclean.com/blog/4-tipsreduce-residue-in-clear-applications-for-injection-extrusion#top) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Eric Despotovich", "url" : "https://www.asaclean.com/blog/author/eric-despotovich" }, "dateModified" : "2025-06-27T17:22:28.929Z", "datePublished" : "2020-03-11T15:31:32.000Z", "headline" : "4 Tips:Reduce Residue in Clear Applications for Injection & Extrusion", "image" : [ "https://www.asaclean.com/hubfs/asaclean%20sunglasses.jpg" ], "mainEntityOfPage" : { "@id" : "https://www.asaclean.com/blog/4-tipsreduce-residue-in-clear-applications-for-injection-extrusion", "@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 most of you may know, when processing resins such as Polycarbonate, Acrylic, TPU or Co-polyesters you will most likely deal with black carbon specks at some point in the process. Most of you now know that you can remove this carbon with a quality purge compound, such as Asaclean’s EX Grade or the chemical NCR Grade instead of having to pull screws. The problem then becomes getting any residue from the machine in these clear applications.", "author" : { "@type" : "Person", "name" : "Eric Despotovich" }, "datePublished" : "March 11, 2020", "headline" : "4 Tips:Reduce Residue in Clear Applications for Injection & Extrusion", "image" : "https://468726.fs1.hubspotusercontent-na1.net/hubfs/468726/asaclean%20sunglasses.jpg", "name" : "4 Tips:Reduce Residue in Clear Applications for Injection & Extrusion", "url" : "https://www.asaclean.com/blog/4-tipsreduce-residue-in-clear-applications-for-injection-extrusion" } ```