... ,Dimethyl Sulfoxide 99.9%min purity methyl sulfonyl methane powder MSM Methyl Sulfonyl Methane/Dimethyl sulfoneMethylsulfonylmethane,%: 99.9 MinimumDMSO, %: 0.01MaxmumAppearance: white ... (g/ml): 0.74 MinimumWater, %: 0.20 MaximumHeavy Metals (As Lead): < 10.0 ppmResidue on Ignition: <0.10 methyl sulfonyl methane powder