Zinc oxide
Test items Indirect method Direct method
Zinc oxide(counted by dried substances )% ≥ 99.7 99.5
Metal ( Zn ) % ≤ None None
Lead oxide( Pb ) % ≤ 0.037 0.12
Manganese oxide ( Mn) % ≤ 0.0001 0.0002
Cupric oxide ( Cu ) % ≤ 0.0002 0.006
Burning decrement % ≤ 0.2 0.4
105℃ volatile substances % ≤ 0.3 0.4
Water dissoluble % ≤ 0.1 0.4
Hydrochloric indissoluble substance % ≤ 0.006 0.03
Sieve Residue % ≤ 0.1 0.28
Lead oxide(PbO) % ≤ -- 0.12
Package: woven bag, inner with plastic bag.25KG/bag
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Dimethylamine |
Appearance: colorless transparent liquid.
Dimethylamine ≥ 99.8%;
Monomethylamine ≤ 0.10%;
Trimethylamine ≤ 0.05%;
Ammonia ≤ 0.03%;
Purposes: m... |
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Hydrogen fluoride |
HF:≥99.95%;
H2O:≤0.03%;
SO2:≤0.007%;
H2SO4:≤0.005%;
H2SiF6:≤0.010%. |
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Sodium metabisulfite |
Test items Refined High-purity grade Food-grade Industrial-grade
Sodium metabisulfite % ≥ 98.5 98 97.5 97.0
Iron Fe % ≤ 0.0005 0.001 0.0015... |
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Zinc oxide |
Test items Indirect method Direct method
Zinc oxide(counted by dried substances )% ≥ 99.7 99.5
Metal ( Zn ) % ≤ None None
Lead oxide( Pb ... |
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Anhydrous Sodium Sulfite |
Test items Food-grade High-purity grade Industrial-grade
Sodium sulfite (Na2SO3) % ≥ 97 98 97
Iron Fe % ≤ 0.001 0.001 0.003
Free Alkali (N... |
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