BS EN ISO 20932-1 Textiles. Determination of the Elasticity of Fabrics. Strip Tests.
Replaces BS EN 14704-1
There is a new European standard for the determination of elasticity of fabrics. This was published May 2020 and is recommended to be followed from 28th August 2020.
Changes
BS EN ISO 20932-1:2020 was developed as a result of technical advancements in yarn and fabric structures and properties. It is based on EN 14704-1 and is almost the same as EN 14704-1, but BS EN ISO 20932-1 includes the “pretension” if the automatic calculation is used from a Constant Rate of Extension (CRE) machine.
Major Updates / Changes in ISO 20932-1:
• Pretension is required for automatic calculation from CRE is used
• Method A Strip specimen:
Woven – 1cN/CM
Knitted – 0.5cN/CM
• Method B Loop specimen:
Woven – 2cN/CM
Knitted – 1cN/CM
• The cross-head moves to this pretension to record the initial length.
• If a pretension is used, placing of reference marks is not required,
since the length at pretension is used for calculation
• Term of Un-recovery elongation is changed to Permanent deformation in
ISO 20932-1
It is recommended that you update your testing requirements / testing manual.
Please refer to the actual standard for the full and detailed requirements.
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