GB 10621-1989

This standard specifies the technical requirements, test methods, inspection rules, and packaging, labeling, storage, and transportation conditions for liquid carbon dioxide used as a food additive, specifically when sourced from lime-kiln or ammonia plant off-gases. It is applied in the food industry to ensure the purity and safety of carbon dioxide used for carbonating beverages, as a propellant in food packaging, and as a preservative or pH regulator in food processing. The standard also governs quality control testing for manufacturers and regulatory compliance for suppliers of food-grade carbon dioxide.