---
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.
---

[Plastics Processing Purging Tips On The ASACLEAN Blog ](https://www.asaclean.com/blog)

# [4 Tips:Reduce Residue in Clear Applications for Injection & Extrusion](https://www.asaclean.com/blog/4-tipsreduce-residue-in-clear-applications-for-injection-extrusion)

 Written by [Eric Despotovich](https://www.asaclean.com/blog/author/eric-despotovich) | Mar 11, 2020 3:31:32 PM

   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.**

[View full post](https://www.asaclean.com/blog/4-tipsreduce-residue-in-clear-applications-for-injection-extrusion)

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