GB/T 42764-2023 English PDF (GBT42764-2023)

This document describes test methods for assessing the inherent biodegradability of plastic raw materials and polymers in marine environments without any environmental exposure or pretreatment. The test methods in this document are carried out under aerobic, mesophilic conditions and are aimed to obtain the ultimate biodegradability of materials, i.e. conversion into carbon dioxide, water, and biomass. This document is only used to evaluate the inherent biodegradability of materials. It is not used to evaluate the environmental hazards of possible constituents such as heavy metals and other substances, nor is it used to evaluate its potential ecotoxicity. This document is suitable for assessing the overall environmental impact of plastics released intentionally or unintentionally into the marine environment. This document is not used to evaluate the performance of products processed from biodegradable plastic raw materials and biodegradable polymers. The lifetime and biodegradation rate of biodegradable plastic products in the ocean are often affected by specific environmental conditions as well as the thickness and shape of the product. The test results of biodegradability obtained under the test conditions specified in this document cannot be directly extrapolated to the actual marine environment. This document does not apply to ¡°marine biodegradable¡± claims for biodegradable plastic raw materials. If necessary, refer to the relevant product standard. The test methods specified in this document cannot be used to determine the specific biodegradation rate (i.e. rate per available surface area) of the test material. If necessary, refer to the relevant standards about biodegradation rates. GB/T42764-2023 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 10