This document specifies the product classification, requirements, inspection rules, marking, packaging, transportation and storage of recycled polypropylene foam insulation sheets (hereinafter referred to as "products"). This document is applicable to using recycled polypropylene resin as the main raw material, adding a certain amount of foaming agent and a small amount of additives, and producing a single layer with a cellular structure and an apparent density of 20kg/m3 to 500kg/m3 through extrusion molding. Production, inspection and sales of foam sheets.