This part of EN ISO 13935 describes the grab test determination of seam maximum force of sewn seams. Part 1 of EN ISO 13935 will describe the method known as the strip test. The method is mainly applicable to woven textile fabrics. It may be applicable to fabrics produced by other techniques. It is not normally applicable to woven elastic fabrics, geotextiles, nonwovens, coated fabrics, textile-glass woven fabrics and fabrics made from carbon fibres or polyolefin tape yarns. The sewn fabrics may be obtained from previously sewn articles or may be prepared from fabric samples. This method is applicable to straight seams only and not to curved seams.