Dyed or other colored textiles can fade or color shift when exposed to the combination of heat, light and moisture. In addition, natural or synthetic polymers can lose mechanical strength. Therefore, it is important to test textiles to determine their stability and durability to the environments in which they will be exposed.
ASTM, ISO and AATCC published general lightfastness and weathering standards for textiles. Application-specific methods, such as for automotive interior, often use these same methods or are modified in OEM or other standards and specifications.