Acetal is a high-strength thermoplastic also known by its brand names, Delrin®, Tecaform® and Sustarin®. It has exceptional mechanical properties and temperature resistance when compared to other, more common plastics. It is easy to machine and has excellent dimensional stability. This combination of properties makes CNC machining in Delrin perfect for high-precision mechanical components such as gears and bearings. Delrin parts can be found in consumer electronics such as printers and televisions.
Delrin is the DuPont trade name for homopolymer acetal. It has better mechanical properties than acetal copolymer with a notable improvement in impact resistance. In addition to its exceptional mechanical properties, CNC machined acetal offers superior dimensional stability that makes it ideal for high-precision parts.
Due to its high impact resistance and low friction characteristics, CNC machined Delrin is ideal for gears, door system components, and bushings. It is a lightweight and cheap alternative to metal parts and in many ways bridges the gap between plastics and metals. Delrin can also maintain its properties across a temperature range of -40oC to 120oC, which is a much bigger range than most other plastics can tolerate.
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As is the case with most plastics for machining, acetal parts can only accept a few types of surface finishes. Below are some options for improving the surface finish of CNC machined Delrin components.
Acetal (Delrin) is one of the more expensive plastics on the market so it is important to follow the cost-saving principles below.