Product Description A colorless gas with a choking or suffocating odor. Boiling point -10C. Heavier than air. Very toxic by inhalation and may irritate the eyes and mucous membranes. Under prolonged exposure to fire or heat the containers may rupture violently and rocket. Liquid sulphur dioxide (SO2) is a versatile chemical with many uses, both in liquid form or as a source of gaseous SO2. Liquid SO2 is used the pulp and paper industry, mining industry, and in the food industry as a preservative. It can function as a reducing agent, an oxidizing agent, a pH controller, purifying agent, preservative, a germicide and bleaching agent. SO2 can also be used as a refrigerant, heat transfer fluid and selective solvent. Products specification: Specifications Special grade Grade A SO2 content % 99.97 99.90 Residue content % 0.010 0.040 Moisture content % 0.020 0.060 Arsenic(As) content % 0.000004 0.0001 Color (as liquid) Water White Water White Color (as gas) Colorless Colorless Standard No. GB3637-93