Lever-640 is a specialized additive used in nylon/spandex blending to aid in the coloring of spandex fibers. It can improve the coloring of spandex components in nylon/spandex blending, making the blending fibers nearly consistent in color. It solves the problem of spandex whitening and staining during dyeing, without affecting the elasticity of spandex. It is particularly recommended for nylon elastic knitted fabrics such as underwear, swimsuit, casual wear, and high-grade sportswear.

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