Bleeding Issues

Bleeding in Injection Molding

Bleeding in injection molding is defined as undesired movement of materials within a mold or molded part. In most instances, bleeding leads to an increase in scrap and rejects, plus downtime, none of which are good for plastic injection molders.

The good news is that with the right Nanoplas product, you can mitigate bleeding. See below for the most common causes and our proven solutions.

Common Cause:

Higher Temperatures

Higher temperatures can cause grease to break down and liquify. When this happens, grease can migrate and turn tacky, causing build-up in troublesome areas or contaminating parts.



MIN-LUBE High Performance Grease can withstand higher temperatures, so it won’t break down and bleed out.

Common Cause:

Over Applying Rust Preventative

When a rust preventative is over-applied, it can cause grease to break down in certain areas of the mold, leading to bleeding. If it’s breaking down and bleeding around ejector pins, your parts will likely be contaminated. If the grease breaks down on the slides and lifters, it could become tacky, causing them to seize, or it’ll bleed completely out, causing you to run metal-on-metal, wreaking havoc on your mold.


Mold Guard Rust Preventative Cut Out

Mold Guard™

As a truly dry rust preventative, Mold Guard won’t break down grease. It can also be molded through at startup, so you can get your mold up and running faster.

Common Cause:

Over Applying Grease

Over applying grease, especially on ejectors pins, can lead to part contamination. You may also find grease seeping out of ejector pin holes, slowly migrating to the part or other areas of the mold cavity that may come in contact with the finished goods being produced. This can lead to scrap or buildup in troublesome areas of the mold.




A very thin application of Min-Lube is enough lubrication for traditional molding operations, because this product provides high load-bearing properties, and wear protection due to it’s extreme mechanical stability.


Min-Lube High Performance Lubricating Mold Grease


Min-Lube High Performance Grease has strong adhesion, anti-wear additives, and a low coefficient of friction, so the thinnest of coatings is enough to get the job done, and it’ll stay put.

Better Together

When used in tandem, Nanoplas products can help you significantly reduce costs, downtime, scrap, and more. Scientifically formulated, each product is individually effective, so when used together, they enhance mold performance significantly.

2300% Increase in Run Capacity with SYN-LUBE*

See Case Study

SYN-LUBE* is lasting weekly, as opposed to daily. Run capacity has increased from 1,000-1,500 parts to 24,000 parts before having to reapply.”

*SYN-LUBE is no longer available. Try Min-Lube.

William Duffield

Tool Room Supervisor, Erwin Quader, Inc.