Sodium Metabisulphite (SMBS)
White to off-white crystalline powder · CAS 7681-57-4
DocumentsSpec sheet (PDF, 32 KB)Safety Data Sheet (PDF, 82 KB)
Also available: Sodium Metabisulphite (SMBS) — Lion Brand (China), Sodium Metabisulphite (SMBS) — Magna Brand, Sodium Metabisulphite (SMBS) — Aditya Birla.
This is one of 7 grades in our Sodium Metabisulphite (SMBS) — Industrial and Food Grades. Compare all 7 grades →
Overview
Sodium Metabisulphite, commonly abbreviated SMBS (CAS 7681-57-4, also known as sodium pyrosulphite), is a white to off-white crystalline reducing agent Suraj Chemicals supplies for dechlorination and general reducing duties in water treatment, as a boiler feed-water oxygen scavenger, and for use as a reducing agent in photographic and textile bleach baths (a food-grade version is also listed separately for preservative use). It's packed in 25/50 kg bags, with bulk supply available on request.
Specification Sheet — Characteristics
Download Specification Sheet (PDF)| Characteristics | Specifications |
|---|---|
| Content (Na₂S₂O₅) | 97.0% Min |
| SO₂ | 65.0% Min |
| Iron (Fe) | 0.003% Max |
| Arsenic (As) | 0.0001% Max |
| Water Insoluble Matter | 0.05% Max |
These values come from our own lab test on Sodium Metabisulphite. They vary slightly from batch to batch, so ask for a current certificate of analysis with your order.
Origin
- Imported – China
A certificate of analysis is supplied with every batch.
Applications
- Dechlorination and reducing agent in water treatment
- Boiler feed-water oxygen scavenger
- Food and beverage preservative (food grade also available)
- Photographic and textile bleach-bath reducing agent
Safety & Handling Summary
| Topic | Summary |
|---|---|
| Signal word | Warning |
| GHS hazards | H302 — Harmful if swallowed H315 — Causes skin irritation H319 — Causes serious eye irritation H335 — May cause respiratory irritation |
| Incompatible with | Acids, water/moisture, powdered potassium/sodium metals, alkali and oxidizing agents, chlorates |
| Gloves | Protective gloves as needed to prevent excessive skin contact |
| Eye / face | Protective eyeglasses or goggles per OSHA 29 CFR 1910.133 |
| Respiratory | Follow OSHA respirator regulations (29 CFR 1910.134); wear an MSHA/NIOSH-approved respirator selected for the working conditions. Wear SCBA for emergency or non-routine operations (spill cleanup, reactor vessels, storage tanks) |
| Body | Protective boots and clothing when necessary to prevent excessive skin contact |
| Transport (road) | Confirm the shipping classification with us before dispatch — see Section 14 of the SDS |
| Emergency handling | First aid, fire-fighting and spill / release measures are in Sections 4–6 of the SDS. Emergency contact: +91 70927 22822 / +91 98402 84032. |
A summary of the Sodium Metabisulphite Safety Data Sheet. The full SDS is the authority: download it at the top of this page and read it before first use. Hazard ratings can change with grade and concentration, so confirm the transport class for each consignment.
Frequently Asked Questions
What is Sodium Metabisulphite (SMBS)?
Sodium Metabisulphite (SMBS) is supplied by Suraj Chemicals as white to off-white crystalline powder, identified by CAS number 7681-57-4. It falls under our Salts & Minerals range — see the Specification Sheet table above for its full characteristics.
What is Sodium Metabisulphite (SMBS) used for?
Typical applications include: Dechlorination and reducing agent in water treatment; Boiler feed-water oxygen scavenger; Food and beverage preservative (food grade also available); Photographic and textile bleach-bath reducing agent.
How should Sodium Metabisulphite (SMBS) be stored and handled?
Store sealed in a dry, cool area away from moisture and oxidizers — releases SO₂ gas when damp.
What packaging and pack sizes does Suraj Chemicals supply Sodium Metabisulphite (SMBS) in?
25/50 kg bags; bulk supply on request. Contact us if you need a different pack size, or a bulk/tanker quantity.
What is the shelf life of Sodium Metabisulphite (SMBS)?
Typically 3–6 months from date of manufacture when stored sealed, in a cool place away from direct sunlight and heat. Active content in hypochlorite / oxidising products declines gradually over time, so this is one to watch closely. As with any industrial chemical, request the current batch's manufacturing date and a fresh certificate of analysis for orders where exact remaining shelf life matters.
Is Sodium Metabisulphite (SMBS) hazardous to handle?
Yes. Sodium Metabisulphite (SMBS) is classified under GHS (signal word: Warning) as: harmful if swallowed (H302); causes skin irritation (H315); causes serious eye irritation (H319); may cause respiratory irritation (H335). Follow the storage and handling guidance above, use appropriate PPE, and download the Safety Data Sheet (SDS/MSDS) in the sidebar above for full GHS hazard, handling and PPE details.
Is a Specification Sheet, TDS or MSDS available for Sodium Metabisulphite (SMBS)?
Yes. a downloadable Specification Sheet (PDF) with full characteristics and specifications is available above, and a downloadable Safety Data Sheet (SDS/MSDS) for Sodium Metabisulphite (SMBS) is also available above.
Can I get a sample or discuss order quantity for Sodium Metabisulphite (SMBS)?
Yes. use the Request Price & Availability button or WhatsApp us with your required quantity, and our team will confirm pricing, minimum order quantity, sample availability and delivery timelines for Sodium Metabisulphite (SMBS).
Actual packaging as supplied by Suraj Chemicals
CAS Number
7681-57-4
Also Known As
Sodium Metabisulfite, SMBS, Disodium Disulfite, Sodium Pyrosulfite
Chemical Formula
Na2S2O5
Grade
Technical / Industrial Grade
Appearance
White to off-white crystalline powder
Packaging
25/50 kg bags; bulk supply on request
Storage & Handling
Store sealed in a dry, cool area away from moisture and oxidizers — releases SO₂ gas when damp.
Shelf Life
Typically 3–6 months from date of manufacture when stored sealed, in a cool place away from direct sunlight and heat. Active content in hypochlorite / oxidising products declines gradually over time, so this is one to watch closely. As with any industrial chemical, request the current batch's manufacturing date and a fresh certificate of analysis for orders where exact remaining shelf life matters.