Food-grade quality criteria
Qualify E223 identity, Na2S2O5 assay, SO2, pH, iron, insolubles and sulfite-specific documentation.
Food grade ingredient · Sulfite antioxidant, antibrowning agent and preservative · INS 223
Food Grade Sodium Metabisulfite (SMBS)
Food grade sodium metabisulfite (SMBS), also called sodium disulfite or sodium pyrosulfite, is a sulfite used in permitted foods for antioxidant, antibrowning, flour-treatment or preservative functions.
- CAS number
- 7681-57-4
- Food additive
- INS 223
- Formula
- Na2S2O5
- Commercial basis
- Specification-led
Product image · confirm grade and packaging when ordering
Share the application, critical limits, test methods, quantity, packing and destination.
GradeFood grade, subject to source qualification
Packing25 kg plastic or neutral paper bag
Container loading25 MT / 1,000 bags / 20-foot container, without pallets
Batch evidenceCurrent specification and COA required
Product overview
What is food grade Sodium Metabisulfite?
Food grade sodium metabisulfite (SMBS), also called sodium disulfite or sodium pyrosulfite, is a sulfite used in permitted foods for antioxidant, antibrowning, flour-treatment or preservative functions.
For procurement, “food grade” must be supported by a current source-specific specification, suitable manufacturing and quality documents, and a batch COA. Final use depends on the complete formulation, intended function and destination-market rules.
Procurement snapshot
- Product
- Sodium Metabisulfite
- Common name
- SMBS
- Category
- Sulfite antioxidant, antibrowning agent and preservative
- CAS
- 7681-57-4
- Food additive
- INS 223
- Packing
- 25 kg plastic or neutral paper bag
Procurement checklist
How to source food grade Sodium Metabisulfite in bulk
Compare the offered grade, test methods and commercial terms before requesting a sample or placing an order.
Sodium metabisulfite for food preservation
Provide the exact food category, process, residual target, labeling market and validation plan.
Quantity, packing and delivery
State annual demand, pallets, destination port, Incoterm and whether the reference 20-foot loading is suitable.
Sodium metabisulfite antioxidant E223
Confirm oxidation or browning mechanism, dosing point, contact time and regulatory limit for the finished food.
Application screening
Food grade Sodium Metabisulfite applications
Application selection depends on destination-market permission and finished-food trials.
Fruit and vegetable processing
May help manage enzymatic browning in permitted products and processes.
Beverage and juice processing
Can be evaluated for antioxidant or process functions where sulfite use is permitted.
Starch and sweetener processing
May support color or oxidation control in validated manufacturing steps.
Selected bakery uses
Any flour-treatment or dough use requires exact destination-market review and process validation.
Commercial specifications
Food grade Sodium Metabisulfite reference specification
The table lists commercial reference limits alongside historical example results from 2017. The example results are not evidence for a current shipment; use the agreed specification and current batch COA for acceptance.
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| Test item | Specification | Historical example result |
|---|---|---|
| Appearance | White or yellowish crystalline powder | Historical description |
| Assay as Na2S2O5 | ≥ 96.5% | 97.5% |
| SO2 | ≥ 65.0% | 66.2% |
| Clarity | Passes test | Pass |
| Iron (Fe) | ≤ 0.003 (unit not stated) | 0.0001 |
| pH | 4.0–4.8 | 4.5 |
| Water insolubles | ≤ 0.02% | 0.01% |
| Arsenic | 1 ppm (comparator not stated) | < 1 ppm |
| Heavy metals (as Pb) | 5 ppm (comparator not stated) | < 5 ppm |
Batch and acceptance basis: The historical example is batch BSP1705261, produced June 23, 2017, with expiry June 22, 2019. Its results cannot qualify current supply. The iron unit and the acceptance comparators for arsenic and heavy metals are unspecified; establish them in the signed specification and obtain a current batch COA.
Technical selection
Questions to resolve before approving Sodium Metabisulfite
Sulfite declaration
Assess allergen or sensitivity labeling, residual sulfite and market-specific disclosure requirements.
Current data
The historical example relates to material whose stated expiry was in 2019. Require current batch evidence before shipment.
SO2 basis
Align assay and sulfur dioxide reporting basis, units and analytical methods.
Process validation
Confirm dosage, residual level, sensory impact, packaging and shelf-life performance in the actual food.
Qualification support
Product documents and quality requirements
Product documents
Request the current signed specification or TDS, SDS, test methods, representative COA and batch COA.
Food-grade selection requirements
Verify applicable food-safety, quality, Kosher, Halal and site documents for the exact grade and source.
Official identity reference
Review the FAO/JECFA sodium metabisulfite specification, then apply destination-market rules to the exact finished food.
Storage and handling
Protect Sodium Metabisulfite in storage
- EnvironmentStore in a cool, dry and well-ventilated area in accordance with the current SDS.
- MoistureKeep containers tightly closed and protect packaging from water, humidity, contamination and damage.
- ControlsUse food-ingredient hygiene, lot traceability and stock rotation appropriate to the supplied shelf life.
Buyer questions
Food grade Sodium Metabisulfite FAQ
What is food grade Sodium Metabisulfite used for?
Sodium Metabisulfite is used in suitable food processes for sulfite antioxidant, antibrowning agent and preservative functions. Legal use, dosage and performance must be confirmed for the exact food and destination market.
What are the CAS and food additive numbers for Sodium Metabisulfite?
Sodium Metabisulfite is identified here by CAS 7681-57-4 and INS 223. Confirm the identity and supplied form on the current specification.
What specification should a buyer request for Sodium Metabisulfite?
Request the current signed specification, agreed test methods, representative COA and a current batch COA. Resolve every missing unit, comparator or particle-size requirement before approval.
How is food grade Sodium Metabisulfite packed?
25 kg plastic or neutral paper bag. Confirm food-contact liner, palletization, marks and container loading in the quotation.
What should be included in a SMBS RFQ?
Provide the food application, target standard and critical limits, quantity, packing, destination, certificates, Incoterm and requested delivery date.
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Specification-led sourcing
Request a food grade Sodium Metabisulfite quote
Share the application, target grade and limits, quantity, packing, destination and required documents for a relevant bulk-supply proposal.
Product documents
Request documents
Tell us your grade and destination market so we can confirm which documents are available for your order.
An external reference is not a batch certificate or a Bespring product specification.