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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

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. For additional information, see our article at: http://www.squidoo.com/types-of-teflon