When sourcing flame retardant curtains, you must ensure compliance with specific regional standards. For the US market, NFPA 701 is the primary requirement for drapery. For the European market, BS 5867 Part 2 Type B or C (UK) and DIN 4102 B1 (Germany) are the gold standards. It is critical to distinguish between FR (Flame Retardant treated) and IFR (Inherently Flame Retardant) fabrics; IFR fabrics, usually made of Trevira CS or modified polyester, maintain their properties after repeated washing, whereas treated fabrics may lose efficacy over time.