GB/T 5558-2015

This standard specifies test methods for evaluating the wetting performance of surfactants used in mercerization baths, a textile processing step where cotton yarn or fabric is treated with concentrated sodium hydroxide. It is applied in the chemical and textile industries to assess how effectively a wetting agent facilitates uniform alkali penetration into cellulose fibers, ensuring consistent fabric luster, strength, and dye uptake. The evaluation is critical for quality control and product selection in textile manufacturing and surfactant formulation.