These are both polyacetal grades, manufactured by companies such as Quadrant Engineering Plastics.
Acetal is a copolymer version;
Copolymer grades tend to be more resistant against hydrolysis, strong
alkalis and thermal-oxidative degredation than the homopolymer grades.
Delrin is a homopolymer version;
The homopolymer grades have a higher
mechanical strength, stiffness, hardness and creep resistance as well
as a lower thermal expansion rate and often it also presents a better
wear resistance.
Be wary of listings with both the words 'Acetal' and 'Delrin' in the
title- they may be trying to sell Acetal at Delrin prices, which are
usually slightly higher.
Look out for brand-names, Ertacetal for example comes in a
number of forms- Ertacetal C is a copolymer Acetal, Ertacetal H is a
homopolymer made from genuine DuPont Delrin resin.
Both products are usually available in Natural (White) and Black.
Acetal is made in other colours, with Blue being a popular choice in
the food industry.
Search for Acetal on eBay | Search for Delrin on eBay | Visit eBay Shop \'Plastic Supermarket\'
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