Fabrics with bulk yarns such as chenille and boucle are prone to fail what type of test?

Fabrics constructed with bulk yarns like chenille and boucle are typically more susceptible to seam slippage due to the way their fibers engage and support the integrity of seams. These fabrics feature a textured surface with bulky fibers that can create a loose structure, making it challenging for the yarns to hold together under stress.

When subjected to force, particularly along the seams where the fabric is stitched, this type of textile may experience a phenomenon known as seam slippage, which is when the fabric pulls apart at the seams rather than tearing through the fabric itself. This can be exacerbated in these textured fabrics, as their surface characteristics can hinder the effective locking of stitches. Therefore, during the seam slippage test, the ability of the fabric to withstand pulling forces without the seams losing their structural integrity is evaluated, revealing weaknesses that can be attributed to the characteristics of the yarns used in these fabric types.

In contrast, while colorfastness tests address how colors remain stable when exposed to various conditions and pilling tests evaluate the formation of small balls of fiber on the fabric surface, neither of these tests directly evaluates the structural stability of seams, making them less relevant in this context.