--- title: Is Overuse of Mold Release Hurting Your Injection Molding Process? description: Sometimes too much of a good thing is a bad thing. If you are an injection molding plastics processor using too much mold release spray, you could screwing up. image: https://www.asaclean.com/hubfs/AI-Generated%20Media/Images/This%20image%20depicts%20three%20spray%20paint%20cans%20with%20blank%20labels.jpeg --- [ 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%2Foveruse-of-mold-release-hurts-your-injection-molding-process&text=Is+Overuse+of+Mold+Release+Hurting+Your+Injection+Molding+Process%3F) - [LinkedIn Share ](https://www.linkedin.com/shareArticle?mini=true&url=https%3A%2F%2Fwww.asaclean.com%2Fblog%2Foveruse-of-mold-release-hurts-your-injection-molding-process&title=Is%20Overuse%20of%20Mold%20Release%20Hurting%20Your%20Injection%20Molding%20Process%3F&summary=Sometimes+too+much+of+a+good+thing+is+a+bad+thing.+If+you+are+an+injection+molding+plastics+processor+using+too+much+mold+release+spray%2C+you+could+screwing+up.&source=) - [Pinterest Pin ](https://pinterest.com/pin/create/button/?url=https%3A%2F%2Fwww.asaclean.com%2Fblog%2Foveruse-of-mold-release-hurts-your-injection-molding-process) - [Email Email ](mailto:?subject=Is%20Overuse%20of%20Mold%20Release%20Hurting%20Your%20Injection%20Molding%20Process%3F&body=https%3A%2F%2Fwww.asaclean.com%2Fblog%2Foveruse-of-mold-release-hurts-your-injection-molding-process) ![Is Overuse of Mold Release Hurting Your Injection Molding Process?](https://www.asaclean.com/hs-fs/hubfs/AI-Generated%20Media/Images/This%20image%20depicts%20three%20spray%20paint%20cans%20with%20blank%20labels.jpeg?width=640&height=500&name=This%20image%20depicts%20three%20spray%20paint%20cans%20with%20blank%20labels.jpeg) ![spray-cans_2444031.jpg](https://www.asaclean.com/hs-fs/hubfs/spray-cans_2444031.jpg?width=320&name=spray-cans_2444031.jpg "spray-cans_2444031.jpg") Many years ago, I performed a trial at a Midwest Injection Molding company. They asked me to troubleshoot a knit line problem with a part that was being produced from Vectra A-130 (LCP) resin. For those not familiar, Vectra inherently has poor knit line strength. The part was a 10” long probe, approximately 3” in diameter with a thick wall thickness of about 0.100”. It was gated in such a way that it caused a knit line on the opposite side of the gate.   First off, I discovered that the old Cincinnati Milacron machine I was working had a leaky check ring and I could not pack the part out properly. This caused a poor weld/knit line to form. Once the machine was fixed and the tech was producing parts, I noticed him spraying mold release on the core for the part to release. This was where the [mold release](http://www.ptonline.com/articles/know-your-mold-coatings) became detrimental to the process. They used so much mold release that the Vectra flow front was pushing the release along the core and trapping it in the weld/knit line, thus producing rejected parts.  The solution was easy. With a new check ring in the machine, we stopped using mold release and we made some simple adjustments to the tool to help it release. Once these two steps were taken, we were producing great parts with strong weld lines and no rejects. **Learn about the importance of implementing proper purging procedures by downloading this free industry guide.** **** ** [![](https://no-cache.hubspot.com/cta/default/468726/interactive-161630774182.png) ](https://www.asaclean.com/hs/cta/wi/redirect?encryptedPayload=AVxigLKK7A%2Bm22UPOGmLAmcREzQ04ZhHD1vSSPkIbXen65x7LVRG%2BaV67Awq5pHbcjo9f8lPgIOmf1gkMr9nk9g7rM4kcUg%2FDcDJTnrA1CUG7pi9p4ZlpQhMPW4keAk%2FOq%2Bwx6rArCJi%2FLxUFE1gJJRdBHxh49VTM7CDFXD8S3z8%2FLTrE31eMlaAtqTzEnmKBtzsYaN0Nf5RRtbIyNFMGhqWAoEACmANI9AKZeXf1kFKa6K%2FszJripnMcW0%2B&webInteractiveContentId=161630774182&portalId=468726) ** ** ** ![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 [![3 Effective Tips for Managing Shear Heat in Injection Molding](https://www.asaclean.com/hs-fs/hubfs/pexels-photo-167084.jpg?width=450&height=250&name=pexels-photo-167084.jpg) 3 Effective Tips for Managing Shear Heat in Injection Molding Troubleshooting / 2 min read / October 22, 2024 ](https://www.asaclean.com/blog/3-tips-for-dealing-with-shear-heat-in-injection-molding) [![The Importance of Experience: Seeing the Bigger Picture](https://www.asaclean.com/hs-fs/hubfs/AI-Generated%20Media/Images/this%20image%20depicts%20a%20sign%20that%20says%20Knowledge%20Vs%20Experience-2.jpeg?width=450&height=250&name=this%20image%20depicts%20a%20sign%20that%20says%20Knowledge%20Vs%20Experience-2.jpeg) The Importance of Experience: Seeing the Bigger Picture Troubleshooting / 3 min read / April 12, 2018 ](https://www.asaclean.com/blog/the-importance-of-experience-seeing-the-bigger-picture) ## Comments Get Started ## Ready to start improving your efficiency and increasing your profitability? - [Request a Consultation](https://www.asaclean.com/blog/overuse-of-mold-release-hurts-your-injection-molding-process#) - [Contact Sales](https://www.asaclean.com/blog/overuse-of-mold-release-hurts-your-injection-molding-process#) ![](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/overuse-of-mold-release-hurts-your-injection-molding-process#top) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Eric Despotovich", "url" : "https://www.asaclean.com/blog/author/eric-despotovich" }, "dateModified" : "2025-07-08T17:37:26.159Z", "datePublished" : "2017-04-18T14:12:00.000Z", "headline" : "Is Overuse of Mold Release Hurting Your Injection Molding Process?", "image" : [ "https://www.asaclean.com/hubfs/AI-Generated%20Media/Images/This%20image%20depicts%20three%20spray%20paint%20cans%20with%20blank%20labels.jpeg" ], "mainEntityOfPage" : { "@id" : "https://www.asaclean.com/blog/overuse-of-mold-release-hurts-your-injection-molding-process", "@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" : "Many years ago, I performed a trial at a Midwest Injection Molding company. They asked me to troubleshoot a knit line problem with a part that was being produced from Vectra A-130 (LCP) resin. For those not familiar, Vectra inherently has poor knit line strength. The part was a 10” long probe, approximately 3” in diameter with a thick wall thickness of about 0.100”. It was gated in such a way that it caused a knit line on the opposite side of the gate.", "author" : { "@type" : "Person", "name" : "Eric Despotovich" }, "datePublished" : "April 18, 2017", "headline" : "Is Overuse of Mold Release Hurting Your Injection Molding Process?", "image" : "https://468726.fs1.hubspotusercontent-na1.net/hubfs/468726/AI-Generated%20Media/Images/This%20image%20depicts%20three%20spray%20paint%20cans%20with%20blank%20labels.jpeg", "name" : "Is Overuse of Mold Release Hurting Your Injection Molding Process?", "url" : "https://www.asaclean.com/blog/overuse-of-mold-release-hurts-your-injection-molding-process" } ```