ASTM D2902-21

Podrobné informace

Označení: ASTM D2902-21

Datum vydání: 01.03.2021

Stran: 7

Země: Americká technická norma

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Anotace

This specification applies to flexible fluoropolymer resin heat-shrinkable extruded tubing made from tetrafluoroethylene resin, copolymer of tetrafluoroethylene and hexafluoropropylene (FEP), and from perfluoroalkoxy (PFA) resin for use as electrical insulation. This specification covers three types of tubings, namely: Type I tubing, normally made by paste extrusion, and Type II and Type III tubings, normally made by melt extrusion. The finished compound shall be free of all foreign matter other than intended formulation additives. The material shall conform to the specified chemical and physical property requirements such as: (1) restricted shrinkage, (2) specific gravity, (3) longitudinal change, (4) tensile modulus at elongation, (5) volume resistivity, (6) dielectric breakdown voltage, (7) heat resistance, (8) low-temperature flexibility, and (9) melting point. The dimensional requirements after unrestrictive shrinkage such as inside diameter, wall thickness, and stock lengths are specified. The sampling and test methods to determine conformance to the specified requirements are given.


Keywords:
electrical insulation, FEP, fluoropolymer resin heat-shrinkable tubing, heat-shrinkable tubing, PFA fluoropolymer, PTFE,, ICS Number Code 29.035.20 (Plastic and rubber insulating materials),83.140.10 (Films and sheets)