1,Leather Auxiliary Agents, 2,Rubber Auxiliary Agents, 1500PPMSodium sulfide Sodium sulfide/Na2S(%)60.0MinFe/Fe(%)0.15MaxSodium carbonate/Na2CO3(%)5. ... .003MaxSodium carbonate/Na2CO3(%)2.0MaxWater insolubles/Water Insoluble(%)0.2Max Sodium sulfide crystal