This document specifies the terms and definitions of polyvinylidene fluoride hollow fiber ultrafiltration membranes, product models, basic requirements, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage and quality commitments. This document applies to polyvinylidene fluoride hollow fiber ultrafiltration membranes (hereinafter referred to as ultrafiltration membranes) used in seawater, brackish water pretreatment, sewage treatment, industrial and domestic water treatment.