This specification deals with the requirements for processed unfilled polytetrafluoroethylene (PTFE) products which may occur in several forms. The PTFE used to make the semi-finished product is described in IS0 12086-1 and, as provided in that International Standard, may contain up to one percent of a comonomer. The PTFE used to make the semi-finished product may be virgin,
reprocessed, or recycled resin. The addition of up to 1.5 % by mass of pigment or colourant is permitted. The standard allows for four grades based on tensile strength and elongation at break. The semi-finished products can be as processed (type P) or dimensionally stabilized (type S) and also may have specified electrical properties or other properties when they are required for an
application. NOTE: References to other standard specifications for semi-finished products
made from polytetrafluoroethylene are listed in Annex A for information.