Matching barrel linings, screws, and screw tip materials to abrasive, corrosive, and general-purpose resins to reduce wear, prevent downtime, and extend equipment life.

Different plastics have different needs, some plastics are mild, some are abrasive, and some are corrosive. The most common lining used is the Standard Bimetallic, with a nickel-boron alloy. It has good abrasion resistance to general purpose resins without reinforcement or abrasive fillers and can even handle abrasive fillers like glass-filled up to 30%. 

Next is the Carbide Bimetallic. With its tungsten carbide liner it can withstand the most abrasive of resins with 30% or higher fillers. Halogenated and chlorinated polymers like PVC and PTFE are corrosive resins. They release acids and need linings like cobalt-nickel alloys with high chromium content or stainless steel that won’t react to the acids. 

The more abrasive resins with high filler content will need something stronger like CPM9V tool steel. With its high percentage of vanadium carbide, CPM9V is designed for the high wear that abrasive resins bring. Corrosive resins will affect the screw just like the barrel, needing a hardened cobalt or nickel alloy with chrome plating. 

Using the wrong materials can lead to premature wear causing unexpected downtime, higher maintenance costs, creating longer cycle times, using more energy, and even inconsistent shots. If it seems like your screw and barrel are deteriorating too fast, make sure that you are using an appropriate material. We have guides in our catalog to help make sure you are using the right alloy for your application.  

Screw Material Guidelines

Barrel Lining Material

By making sure that you choose the appropriate materials for your screws and barrels you can help ensure that your equipment does not wear down prematurely, giving peace of mind that your injection molding press is running efficiently with less maintenance.