What is the difference between homopolymer & copolymer acetal?
There are 2 basic types of acetal: Homopolymer & Copolymer. They usually can be interchanged because many properties are so similar.
ACETAL HOMOPOLYMER-Delrin®: Made by DuPont. Advantages:
* Higher impact strengths at room & low temperatures
* Tensile strength 10-15% higher than comparable copolymers
* Slightly higher continuous use temperature
* Stiffer & slightly harder than copolymer, lower coefficient of friction
ACETAL COPOLYMER-Ultraform®, Celcon®, etc.: Made by several companies such as BASF and Ticona. Advantages:
* Improved dimensional stability
* Better chemical resistance with high pH (basic) solutions
* Lower centerline porosity in extruded shapes
What is the difference between virgin and mechanical grades of Teflon/PTFE?
Virgin Teflon is a higher grade material. It is much better for chemically resistant applications, and it continuously handles high temperatures. Virgin has better physical properties and is a good electrical insulator. It is FDA approved.
Mechanical Teflon is an economical, reprocessed (recycled) Teflon with slightly lower physical properties. Both Virgin and reprocessed Teflon are 100% PTFE material.
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