This document specifies the terms and definitions, specifications, requirements, test methods, inspection rules, packaging, labeling, storage and transportation of reusable silk daily protective masks. This document applies to reusable protective masks with mulberry silk fabric as the inner and outer layers and filter material as the middle layer in daily environments. This document does not apply to respiratory protective equipment for special industries such as hypoxic environments, escape, firefighting, medical and industrial protection. This document does not apply to respiratory protective equipment for infants and children.