Sodium Metabisulfite
- CAS Number
- 7681-57-4
- HSN Code
- 28321090
- Molecular Formula
- Na2S2O5
- Catalogue Number
- AL4195
- Purity
- 97%
- Molecular Weight
- 190.10 g/mol
Complies with : IP | BP | USP | EP | ACS
ISO 9001
ISO 14001
GMP
COA with every batch
Key Properties
Sodium disulfite is an inorganic sodium salt composed of sodium and disulfite ions in a 2:1 ratio. It has a role as a food antioxidant.
Also known as Disodium disulfite, Sodium pyrosulfite.
- Catalogue No.
- AL4195
- CAS Number
- 7681-57-4
- Molecular Formula
- Na2S2O5
- Molecular Weight
- 190.10 g/mol
- HSN Code
- 28321090
- Grade
- AR (Analytical Reagent)
- Product Form
- Substance
Melting point: greater than 302 °F (Decomposes); Density: Specific gravity: 1.4 at 25 °C/4 °C; Solubility: Freely soluble in water, glycerol; slightly soluble in alcohol.
- Appearance
- White hexagonal crystals or powder
- Shelf Life
- 2 years
- Packaging
- Available in: 500 gm plastic bottle
- Storage
- Separated from acids, strong oxidants and food and feedstuffs. Well closed.
1.1 — Product identifier
- Chemical Name
- Sodium Metabisulfite
- Catalogue No.
- AL4195
- Product form
- Substance
- CAS Number
- 7681-57-4
- EC Number
- 231-673-0
- Grade
- AR
- EC Index Number
- 016-063-00-2
- Chemical Formula
- Na2S2O5
- HSN Code
- 28321090
- Synonyms
- Disodium disulfite, Sodium pyrosulfite
1.2 — Relevant identified uses of the substance or mixture and uses advised against
- Use of the substance/mixture
- Used as a reducing agent, antioxidant, and preservative.
- Uses advised against
- Not specified
1.3 — Details of the supplier of the safety data sheet
- Company identification
- Address:- 102, B wing, Savgan Heights, RTO Lane,Andheri (W), Mumbai-400 053Maharashtra, India.
1.4 — Emergency Contact Details
- Phone / e-Mail
- Phone : +91 22 26317055 Mobile : +91 9820385757 e-mail : info@alphachemika.co.in
2.1 — Classification of the substance or mixture
- Classification according to Regulation (EC) No 1272/2008
- Acute Tox. 4; Eye Dam. 1
- Classification source
- ECHA C&L Inventory via PubChem CID 656671 - hazard classes notified by at least 50% of companies; pictograms and signal word derived from those statements
2.2 — Label elements
- Hazard pictograms
- Corrosive, Irritant
- Signal word
- Danger
- Hazard statements
- H302: Harmful if swallowed; H318: Causes serious eye damage
- Precautionary statements
- P264, P264+P265, P270, P280, P301+P317, P305+P354+P338, P317, P330, P501
2.3 — Other hazards
- Other hazards
- Releases irritating sulfur dioxide gas upon contact with acids.
3.1 — Substance
- Name
- Sodium Metabisulfite
- CAS No.
- 7681-57-4
4.1 — Description of first aid measures
- First-aid measures after inhalation
- If a person breathes large amounts of this chemical, move the exposed person to fresh air at once.
- First-aid measures after skin contact
- Wash with soap and water. If irritation occurs, seek medical attention.
- First-aid measures after eye contact
- If this chemical contacts the eyes, immediately wash (irrigate) the eyes with large amounts of water, occasionally lifting the lower and upper lids. Get medical attention immediately.
- First-aid measures after ingestion
- If this chemical has been swallowed, get medical attention immediately.
4.2 — Most important symptoms and effects, both acute and delayed
- Symptoms relating to use
- Irritation of the respiratory tract, skin, and eyes.
4.3 — Indication of any immediate medical attention and special treatment needed
- General information
- Treat symptomatically. Show this safety data sheet to the treating physician.
5.1 — Extinguishing media
- Suitable extinguishing media
- Water spray, carbon dioxide, dry chemical powder, foam.
- Unsuitable extinguishing media
- Not specified
5.2 — Special hazards arising from the substance or mixture
- Special procedures
- Poisonous gases are produced in fire including sulfur oxides.
5.3 — Advice for firefighters
- Protection during firefighting
- Do not enter fire area without proper protective equipment, including respiratory protection.
6.1.1 — For non-emergency personnel
- Emergency procedures
- Evacuate area and ventilate. Wear appropriate protective equipment.
6.3 — Methods and material for containment and cleaning up
- Methods for cleaning up
- Personal protection: filter respirator for acid gases and vapours adapted to the airborne concentration of the substance. Collect leaking and spilled liquid in covered non-metallic containers as far as possible. Absorb liquid in sand or inert absorbent. Wash away remainder with plenty of water.
6.4 — Reference to other sections
- Reference
- Not specified
7.1 — Precautions for safe handling
- Precautions for safe handling
- Avoid inhalation and contact with skin and eyes. Use in a well-ventilated area.
- Hygiene measures
- Wash hands and other exposed areas with mild soap and water before eating, drinking or smoking and when leaving work.
7.2 — Conditions for safe storage, including any incompatibilities
- Storage conditions
- Separated from acids, strong oxidants and food and feedstuffs. Well closed.
8.2 — Exposure controls
- Hand protection
- Protective gloves (e.g. nitrile rubber)
- Eye protection
- Chemical safety goggles or safety glasses
- Skin and body protection
- Wear suitable protective clothing
- Respiratory protection
- Use appropriate respiratory protection if ventilation is inadequate.
9.1 — Information on basic physical and chemical properties
- Physical state
- Solid
- Colour
- White
- Odour
- In the presences of traces of water, it develops an odor of sulfur dioxide
- Odour threshold
- Not specified
- pH value
- 4.5 (1% solution)
- Relative evaporation rate (butylacetate=1)
- Not specified
- Melting point
- greater than 302 °F (Decomposes)
- Freezing point
- Not specified
- Boiling point
- 190 °C (decomposes)
- Flash point
- Not applicable
- Auto-ignition temperature
- Not applicable
- Decomposition temperature
- Not specified
- Flammability (solid, gas)
- Not flammable
- Vapour pressure
- Not specified
- Relative vapour density at 20°C
- Not specified
- Density
- Specific gravity: 1.4 at 25 °C/4 °C
- Solubility
- Freely soluble in water, glycerol; slightly soluble in alcohol
- Log Pow
- -3.7
- Viscosity, kinematic
- Not applicable
- Viscosity, dynamic
- Not specified
- Explosive properties
- Not explosive
- Oxidising properties
- Not oxidizing
- Explosive limits
- Not applicable
10.1 — Reactivity
- Reactivity
- Stable under normal conditions, but reacts with acids to release sulfur dioxide.
10.2 — Chemical stability
- Chemical stability
- On exposure to air and moisture is slowly oxidized to sulfate.
10.3 — Possibility of hazardous reactions
- Possibility of hazardous reactions
- Decomposes on heating and on contact with acids. This produces sulfur oxides. The substance is a strong reducing agent.
10.4 — Conditions to avoid
- Conditions to avoid
- Avoid contact with incompatible materials and excessive heat.
10.5 — Incompatible materials
- Incompatible materials
- Strong acids, strong oxidizers.
10.6 — Hazardous decomposition products
- Hazardous decomposition products
- When heated to decomposition it emits toxic fumes of sulfur and sodium oxides.
11.1 — Information on toxicological effects
- Acute toxicity
- LD50 Rat dermal > 2000 mg/kg; LD50 Hamster iv 95 mg/kg bw; LD50 Rabbit iv 65 mg/kg bw
- Skin corrosion/irritation
- Not classified (based on available data)
- Serious eye damage/irritation
- H318: Causes serious eye damage
- Respiratory or skin sensitisation
- Not classified (based on available data)
- Germ cell mutagenicity
- Not classified (based on available data)
- Carcinogenicity
- Not classified (based on available data)
- Specific target organ toxicity (single exposure)
- Not classified (based on available data)
- Specific target organ toxicity (repeated exposure)
- Not classified (based on available data)
12.1 — Toxicity
- Toxicity information
- Not specified
12.2 — Persistence - degradability
- Persistence - degradability
- Not specified
12.3 — Bioaccumulative potential
- Bioaccumulative potential
- Not specified
12.4 — Mobility in soil
- Mobility in soil
- Not specified
12.6 — Other adverse effects
- Environmental precautions
- Not specified
13.1 — Waste treatment methods
- Additional Info
- Dispose of contents/container in accordance with local, regional, national and international regulations.
14.1 — UN number
- UN-No. (ADR)
- Not assigned
- UN-No. (IMDG)
- Not assigned
- UN-No. (IATA)
- Not assigned
- UN-No. (ADN)
- Not assigned
- UN-No. (RID)
- Not assigned
14.2 — UN proper shipping name
- Proper Shipping Name (ADR)
- Sodium Metabisulfite
- Proper Shipping Name (IMDG)
- Sodium Metabisulfite
- Proper Shipping Name (IATA)
- Sodium Metabisulfite
- Proper Shipping Name (ADN)
- Sodium Metabisulfite
- Proper Shipping Name (RID)
- Sodium Metabisulfite
14.3 — Transport hazard class(es)
- Transport hazard class(es)
- Not classified as hazardous for transport
14.4 — Packing group
- Packing group (ADR)
- Not applicable
- Packing group (IMDG)
- Not applicable
- Packing group (IATA)
- Not applicable
- Packing group (ADN)
- Not applicable
- Packing group (RID)
- Not applicable
14.5 — Environmental hazards
- Dangerous for the environment
- Not specified
- Marine pollutant
- Not specified
- Other information
- No supplementary information available
15.1 — Safety, health and environmental regulations/legislation specific for the substance or mixture
- 15.1.1 EU-Regulations
- Not specified
Sodium metabisulfite is widely used in the food industry as a preservative and antioxidant, particularly in dried fruits and wines, to prevent browning and spoilage. In analytical chemistry, it serves as a reducing agent in various titrations and reactions. Additionally, it is utilized in the photography industry for developing films and papers, as well as in water treatment processes to remove chlorine. Its ability to release sulfur dioxide makes it effective in controlling microbial growth and oxidation in various applications.
ISO 9001
ISO 14001
GMP
COA with every batch
- Batch Number
- AL-2026-AL1393A
- Manufacturing Date
- September-2026
- Expiry Date
- September-2031
- Molecular Weight
- 190.10 g/mol
| Test | Standard | Observed |
|---|---|---|
| Assay (Purity) | 97% min | 97.5% |
| Moisture Content | < 1% | 0.5% |
| Residue on Ignition | < 0.5% | 0.3% |
| Solubility | 50 g/L in water | 52 g/L |
The above product is expected to comply with AR grade specification.
Technical Data Sheet
| Grade | Assay/Purity | Melting/Boiling Point | Moisture/LOD | Residue on Ignition | Related Substances | Solubility |
|---|---|---|---|---|---|---|
| AR | 97% | m.p. greater than 302 °F (Decomposes) | < 1% | < 0.5% | None detected | Freely soluble in water, glycerol; slightly soluble in alcohol |
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“From ordering to shipping, every course of action was smooth. Timely delivery.”
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“Speedy delivery, professional staff.”
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