... , food additive, antistaling agent, glucide, sodium glutamate, citric acid, pectin, glutin, essence and spice, activated clay etc.Also used for chemical ntermediate, cystine ... /T13803.3-1999 orGB/T12496-1999.For external standard, refer to ASTM standard for activated carbon & AWWA standard for activated carbon.Packing: 20KG or 25KG ...