This document specifies the terms and definitions, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of high-flux reinforced polyvinylidene fluoride (PVDF) unlined ultrafiltration membranes. This document is applicable to the manufacturing technology of various large-flux reinforced polyvinylidene fluoride (PVDF) unlined ultrafiltration membranes. Other different types of filter membranes can be used as a reference.