What is the difference between Delrin and UHMW?
Answers
Answer:
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Explanation:
UHMW has surface and chemical properties that are rare to find in high-performance polymers. It is very resistant to most chemicals, UV radiation, and micro-organisms, but doesn't have the same creep resistance as Delrin.
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Explanation:
This is a question we hear a lot, and the confusion is understandable. While all Delrin is acetal, not all acetal is Delrin. (All Chevys are cars, but not all cars are Chevys.) Acetal is the popular name for the PolyOxyMethylene (POM) family of thermoplastics. Acetal is available in two general types of resins: copolymers and homopolymers. Delrin is the common name for homopolymer acetal.
Delrin has slightly better mechanical properties than copolymer acetal, but often contains a low density center, especially in large cross-sections. It also has slightly less chemical resistance than the copolymer alternative, but is ideal for applications that benefit from Delrin’s additional strength and rigidity, such as small diameter, thin-walled bushings. Delrin is easy to machine, has very low moisture absorption, and provides a nice machined surface finish.
Other benefits of Delrin over copolymer acetal include:
Greater stiffness (with higher flexural modulus) in room and elevated temperature applications
A lower coefficient of friction
18% higher tensile strength, 12% harder and 16% better rigidity
The only downside to Delrin is centerline porosity. A visible centerline is caused by out gassing during manufacturing and can cause problems with machining or moisture permeation through the material. Thus Delrin is not used for most food and medical applications due to the potential for bacteria growth.