Rui Desheng Chemical, [market] metabisulfite, sodium metabisulfite provided by 瑞德胜 chemical. We are Weifang Rui Desheng Chemical Co., Ltd. (www.ruidesheng.com) located at: Shandong Weifang specializes in: sodium sulfate, sodium metabisulfite, deicing salt, calcium chloride, sodium bicarbonate, sodium metabisulfite and easy nature and stability of a damp decomposition of sodium metabisulfite cheap, easily oxidized in air exposed to sodium. Irritation. 2 Contact with acid emit sulfur dioxide and generate the corresponding salts. Heated to 150 ℃ decomposition. Sodium metabisulfite as a white powder with a strong smell of SO2 in the market, and the loss of SO2 absorbed in the air and O2 into Na2SO4. Soluble in water, sodium metabisulfite production process, acidic aqueous solution, when the solution is heated to above 65 ℃ sodium metabisulfite, which is decomposed into Na2SO3 and SO2. Weifang Rui Desheng Chemical Co., Ltd. mainly produces food grade, industrial grade sodium metabisulfite, there is a need, please contact 0536-5330114, Fax 0536-5300069 food grade industrial grade purity (with Na2S2O5 dollars) ≥ 98% ≥ 97% of sulfur dioxide (SO4) ≥ 65.0% ≥ 65.0% Arsenic (As) ≤ 0.0002% Heavy metals (as Pb) ≤ 0.0005% selenium (Se) ≤ 0.0005% Iron (Fe) ≤ 0.001% ≤ 0.002% Water insoluble ≤ 0.02% ≤ 0.05% PH value 4.0 -4.8 4.0-4.8