... .Cetification of Analysis ITEMSINDEXIIINa2S, %,≥60.060.0Fe, %,≤0.150.015Na2CO3 ,%, ≤5.05.0Water Insolubles, %, ≤0.40.4 9.Property: brown ... industries, and so on;11.Variety:1)Sodium Sulphide 60% Min Yellow FlakeS/Nos.TESTTECH SPECS1Na2S60% Min2Fe0.003% ... Max3NaCO32% Max4Water Insolubles0.05% Max2)Sodium Sulphide 60% Min Red SolidS/Nos.TestSpecification1Na2S60% Min2Fe1500ppm Max3)Sodium Sulphide ...