Specification for Kevlar 49 fiber and sampling plan for tensile strength

A specification for Kevlar 49 yarn is presented along with a sampling plan for tensile strength. The specification may be used for purchase and acceptance or for quality control of Kevlar 49 yarn (380 denier). Applied to yarn used in high-performance filament wound composite applications, it calls for clear definition of the material chemically, physically, and mechanically. The material must conform to preset standards of linear weight (denier), chemical structure, density, water content, and tensile properties. Recommended test procedures are included. The sampling plan is based on tensile strength, and the tensile property values listed stem from prior experience with the material. The sampling plan is a sequential acceptance type that applies to a property for which a minimum value is set.