| Product Name: | Sodium pyrosulfite | Other Name: | Disulfurous acid,sodium salt (1:2);Pyrosulfurous acid,disodium salt;Disulfurous acid,disodium salt;Sodium pyrosulfite (Na2S2O5);Sodium pyrosulfite;Sodium metabisulfite;Sodium metabisulfite (Na2S2O5);Disodium pyrosulfite;Fertisilo;Disodium disulfite;Sodium disulfite (Na2S2O5);Disodium metabisulfite;Disodium pyrosulfite (Na2S2O5);Campden Tablets;Colorstrip Catalyst 100;E 223;Sobis;Sobisu;Sodium sulfur oxide (Na2S2O5);NSC 158277;NSC 227243;15771-29-6;1287784-10-4;2242622-57-5 |
| CAS No.: | 7681-57-4 | Molecular Formula: | H2O5S2.2Na |
| InChIKeys: | InChIKey=ZBVPOSMABOMSMZ-UHFFFAOYSA-N | Molecular Weight: | 190.095 |
| Exact Mass: | 189.898254 | EC Number: | 231-673-0 |
| UNII: | 4VON5FNS3C | ICSC Number: | 1461 |
| UN Number: | 1759 | DSSTox ID: | DTXSID0029684 |
| Color/Form: | White hexagonal crystals or powder|White to yellowish crystals or powder.|Colorless crystals|White granular or powdered salt | HScode: | 2832100000 |
| Categories: | Preservative |
| PSA: | 125 | XLogP3: | -3.7 |
| Appearance: | White to slightly yellow Powder/Solid | Density: | 3″>1.4 g/cm3 |
| Melting Point: | 150 °C (decomp) | Boiling Point: | Decomposes |
| Water Solubility: | H2O: 540 g/L (20 ºC) | Storage Conditions: | Storage containers are predominantly made from 1.4571 grade stainless steel. Fiberglass-reinforced plastic containers are also suitable for storage. Paper or plastic sacks, steel barrels, or big bags made of synthetic fibers are used for transportation. |
| Toxicity: | 2000 mg/kg”>LD50 orally in Rabbit: 1540 mg/kg LD50 dermal Rat > 2000 mg/kg | Flammability characteristics: | Noncombustible Solid |
| Odor: | In the presences of traces of water, it develops an odor of sulfur dioxide | PH: | 4,0-5,5 (10 % aqueous solution) |
| Experimental Properties: | … in moist air it decomposes with loss of part of its SO2 content and by oxidation to sodium sulfate … Dry sodium metabilsulfite is more stable to oxidation than dry sodium sulfite|Slowly oxidized to the sulfate on exposure to air and moisture | Air and Water Reactions: | Acts as a corrosive acid when mixed with water. Reacts slowly with air and water. |
| Reactive Group: | Sulfite and Thiosulfate Salts | Reactivity Alerts: | Strong Reducing Agent |
| Reactivity Profile: | SODIUM METABISULFITE is incompatible with the following: Heat (decomposes) [Note: Slowly oxidized to the sulfate on exposure to air & moisture.] (NIOSH, 2016). | Flammable Limits: | Noncombustible Solid |
Classification of the substance or mixture
Acute toxicity – Category 4, Oral
Serious eye damage, Category 1
GHS label elements, including precautionary statements
| Pictogram(s) |   |
|---|---|
| Signal word |
Danger |
| Hazard statement(s) |
H302 Harmful if swallowed H318 Causes serious eye damage |
| Precautionary statement(s) | |
| Prevention |
P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P280 Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/… |
| Response |
P301+P317 IF SWALLOWED: Get medical help. P330 Rinse mouth. P305+P354+P338 IF IN EYES: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P317 Get medical help. |
| Storage |
none |
| Disposal |
P501 Dispose of contents/container to an appropriate treatment and disposal facility in accordance with applicable laws and regulations, and product characteristics at time of disposal. |
Other hazards which do not result in classification
no data available
Precautions for safe handling
Handling in a well ventilated place. Wear suitable protective clothing. Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Use non-sparking tools. Prevent fire caused by electrostatic discharge steam.
Conditions for safe storage, including any incompatibilities
Separated from acids and strong oxidants.The bulk material should be stored in a well closed container, protected from light, in a cool, dry place.