Sodium hydrosulfite
| Physicochemical properties | Color and odor state: white crystalline powder, odorless or slightly peculiar smell | Toxicity: Low toxicity | |
| Flammability: Flammable, easy to release heat and burn when exposed to water and acid | Relative density (water=1): 2.13 | ||
| Volatility: non-volatility | Corrosive: Slightly corrosive | ||
| Boiling point: meaningless (decomposed by heat). | Acidity and alkalinity: weakly alkaline | ||
| Stability: unstable, easy to oxidize in the air, and react violently when exposed to water | Melting point: 52~55°C (decomposition). | ||
| Moisture absorption: strong moisture absorption | Viscosity: powder, non-sticky | ||
| Spontaneous ignition point: 250°C | Deliquescence: Strong deliquescence | ||
| Decomposability: It is easy to decompose when exposed to water, acid, and oxidants, releasing sulfur dioxide and a large amount of heat, and even combustion and explosion | |||
| Solubility: soluble in water, insoluble in organic solvents such as ethanol and ether | |||
| Various numbers | CAS: 7775-14-6 | HS: 2831100000 | EINECS：231-890- |
| Uses | It is used as a reducing agent in the printing and dyeing industry, bleach in pulp and textiles, bleach and antioxidant in the food industry, and is also used in chemical, pharmaceutical, mineral processing and other industries | ||
| Hazard category | Class 4.2 Spontaneous combustible goods, Class 5.1 Oxidizing agents (concurrent). | ||
| Fire-fighting measures | Firefighters must wear air respirators and full-body fire and gas clothing to extinguish the fire in the upwind direction. Do not use water, foam, or carbon dioxide to extinguish the fire. Fire extinguishing agent: dry powder, dry sand. It is forbidden to use water and foam to extinguish fires. | ||
| Emergency treatment | Skin contact: Remove contaminated clothing immediately and rinse with plenty of running water. Seek medical attention. Eye contact: Lift the eyelid immediately and rinse thoroughly with plenty of running water or saline for at least 15 minutes. Seek medical attention. Inhalation: Quickly leave the scene to fresh air. Keep your airways open. If breathing is difficult, give oxygen. If breathing stops, perform artificial respiration immediately. Seek medical attention. Eating: Drink enough warm water to induce vomiting. Seek medical attention. | ||
| Packaging, storage, transportation | Packaging: 25kg /50kg/ sealed iron drum / plastic drum (lined with plastic bag, filled with nitrogen and moisture-proof), lined with plastic bag, the packaging must be tight and moisture-proof. Storage: Store in a cool, dry and well-ventilated warehouse. Stay away from fire and heat sources. The storage temperature does not exceed 30°C and the relative humidity does not exceed 75%. The packaging must be sealed and never exposed to moisture. It should be stored separately from oxidants, acids, alkalis, water, and edible chemicals, and should not be mixed. Transported according to the requirements of dangerous goods. | ||
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