CAN/CGSB-4.2 No. 9.4-M91 (R2013)

This National Standard of Canada is based on International Standard ISO 2062:1972. 1.1 This method determines the breaking strength of single strands of yarns, including monofilaments, single yarns, plied or folded yarns, cabled yarns, cords, threads and twines. It is designed primarily for testing yarn in package form but can be used for single strands removed from a fabric. 1.2 The method is applicable to testing yarns either in the conditioned state or when wet. 1.3 The method may be used with constant-rate-of-extension type (e.g., strain gauge), constant-rate of-traverse type (e g., pendulum), or constant-rate-of-loading type (e.g., inclined plan) testing machines (Note 1). 1.4 Automatic yarn-testing machines may be used provided they can be operated under the conditions specified. Note 1: The three types of testing machines do not necessarily give the same breaking strength of a given sample of yarn when tested at a constant-time-of-break. Good experimental agreement (differences of 5% or less) has been reported in the literature between the results obtained on CRe and CRT testers when the times-to-break were the same but the agreement with the results obtained on CRL testers was not as good (averages differed from those on CRE or CRT testers by as much as 15%).