This British Standard describes a method for determiation of yarn slippage in woven fabrics at stitched seams.
The method is particularly applicable to apparel fabrics, but it is not intended for industrial fabrics, e.g. beltings.
Tests are normally made with a seam opening of 6 mm, but provision is made for a very small seam opening of 3 mm which would produce an unsatisfactory appearance on certain fabrics, e.g. fabrics with warp and weft of contrasting colours.
BS 3320:1988 history
2004BS EN ISO 13936-1:2004 Textiles - Determination of the slippage resistance of yarns at a seam in woven fabrics - Fixed seam opening method
1988BS 3320:1988 Method for determination of slippage resistance of yarns in woven fabrics: seam method