OEKO-TEX Article Numbers Covering One Construction and Not Its Sister
An OEKO-TEX certificate scope covers only explicitly listed article descriptions, leaving chemically modified sister constructions uncertified without separate testing.
Elastane Blend
Fiber Structure
Fabric constructions containing a mix of rigid structural yarns and highly elastic polyurethane fibers provide stretch and recovery properties in modern apparel. Designing an elastane blend allows mills to create garments that conform closely to the body while maintaining shape during movement. This composition is common in activewear and denim.
Tensile Performance
Mechanical behavior in these textiles is characterized by high elongation under load and rapid snapback when the tension is removed. Core spun yarns wrap a sheath of cotton or polyester around the stretchy core to combine a natural feel with synthetic elasticity. This configuration prevents the fabric from bagging or sagging after prolonged use.
Weaving Configuration
Inserting stretch yarns into the weft direction creates comfort stretch. The percentage of elastic fiber typically ranges from two percent for denim to twenty percent for sportswear.
Finishing Care
Thermal setting is required to lock the elastic fibers into their stable state before the fabric undergoes wet processing. Excessively high drying temperatures degrade the polyurethane core, leading to premature elasticity loss and broken fibers that emerge as small hairs on the fabric surface. Quality inspection teams measure dimensional stability after washing to confirm that the heat setting process was executed correctly.