Breaking strength measures a fabric's ability to resist tearing or breaking when subjected to tension.
To evaluate breaking strength, the
fabric to be tested is gripped by clamps at one end while weight is applied to pull it from the other end. This test is performed in both the warp and the filling directions. The
number of pounds required to cause the fabric to break or tear determines the rating.
50 pounds minimum = upholstery
35 pounds minimum = panel and vertical surface fabrics
15 pounds minimum = drapery.
Seam slippage refers to the condition when fabrics pull apart at a sewn seam.
To measure a fabric's ability to resist seam slippage, a seam
is sewn in the fabric to be tested. These sewn fabrics are then clamped at one end and pulled by weights at the other end. This test is performed in both the warp and filling
directions. The weight is increased until the seam separates a specified distance. The number of pounds required to cause this separation determines the fabric's rating.
25 pounds minimum = upholstery
25 pounds minimum = panel and vertical surface fabrics
15 pounds minimum = drapery