Food grade sodium metabisulfite supplier
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
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
Direct product answer
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.
Buyer-intent guide
How to source food grade Sodium Metabisulfite in bulk
Use these qualification points when comparing a China supplier, manufacturer source, distributor offer, bulk quotation or sample.
Sodium metabisulfite for food preservation
Provide the exact food category, process, residual target, labeling market and validation plan.
SMBS 25 kg bags bulk quote
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
These are application-screening areas, not universal approvals or dosage recommendations. Confirm legal use and performance in the finished food.
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.
Supplied technical data
Food grade Sodium Metabisulfite reference specification
The attachment contains a dated 2017 sample record plus specification limits. The table preserves those values for historical screening and must not be treated as a current COA.
| Test item | Specification | Supplied 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 |
Data note: Historical record: batch BSP1705261, produced June 23, 2017, with expiry June 22, 2019. Iron units and the arsenic/heavy-metal comparators are not explicit in the source. Request the current signed specification, current COA and agreed methods before approval.
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 supplied test result expired years ago; require fresh 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
Documents and evidence to request
Product documents
Request the current signed specification or TDS, SDS, test methods, representative COA and batch COA.
Food qualification
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.
Last reviewed 2026-07-25 by Bespring Chemical technical and export team.
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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.