Potassium metabisulphite, BP/USP/EP/Ph. Eur., AR, food grade (FCC)
- CAS
- 16731-55-8
- Formula
- K2O5S2
- MW
- 222.33 g/mol
ZX-038712
Alkali Metal Compounds (Li, Na, K, Rb, Cs)
Potassium metabisulphite, 95%
Available on request
Buy Potassium metabisulphite, 95% (CAS 16731-55-8) from Zemixal: K2O5S2, COA and SDS with every lot, worldwide shipping.
CAS number16731-55-8
FormulaK2O5S2
Molar mass222.33 g/mol
Physical formCrystalline
HS code28322010
Purity98%
InChIKeyRWPGFSMJFRPDDP-UHFFFAOYSA-L
About Potassium metabisulphite, 95%
Zemixal supplies Potassium metabisulphite, 95% within its inorganic Chemicals, Metals & Advanced Materials portfolio. Key data (98%): CAS 16731-55-8, formula K2O5S2 and molar mass 222.33 g/mol. Typical appearance is powder or crystals or crystalline powder, white, passes test.
Use cases we see most often
- Antioxidant additive
- Materials research
Storage and safety notes
Classified under GHS with signal word Danger and hazard statements H315, H318 and H335. Read the SDS before first use.
Order it in 500 g, 5 kg and 4 x 25 kg packs or ask for a bulk quotation. You receive a batch certificate of analysis and a 16-section SDS with each order. Add it to your quote list and our team replies with price, lead time and shipping options within one business day.
Specifications and identifiers
| Product name | Potassium metabisulphite, 95% |
|---|---|
| Catalogue number | ZX-013106 |
| CAS number | 16731-55-8 |
| Molecular formula | K2O5S2 |
| Molar mass | 222.33 g/mol |
| Exact mass | 221.8461 |
| Purity / assay | 98% |
| Physical form | Crystalline |
| Appearance | Powder or crystals or crystalline powder, white, passes test |
| H-bond donors / acceptors | 0 / 6 |
| Topological polar surface area | 125 Ų |
| HS code | 28322010 |
| InChIKey | RWPGFSMJFRPDDP-UHFFFAOYSA-L |
| SMILES | [O-]S(=O)S(=O)(=O)[O-].[K+].[K+] |
| PubChem CID | 28019 |
| Synonyms | Potassium disulfite, Potassium pyrosulfite, Dipotassium pyrosulfite, Dipotassium disulfite, Dipotassium metabisulfite, Potassium disulfite (K2S2O5), Potassium pentaoxodisulfate, Pyrosulfurous acid, dipotassium salt, Ins-224, Potassium metabisulfite (e 224), Disulfurous acid, potassium salt (1:2), Potassium metabisulfite [NF] |
Lot values are stated on the batch certificate of analysis. Ask for a typical COA with your quotation.
Safety and GHS hazards
Signal word Danger
- H315Causes skin irritation
- H318Causes serious eye damage
- H335May cause respiratory irritation
Precautionary statements P261, P264, P264 + P265, P271, P280, P302 + P352, P304 + P340, P305 + P354 + P338, P317, P319, P321, P332 + P317, P362 + P364, P403 + P233, P405, P501
Classification summarised from public GHS notifications. It can vary with grade and concentration, so always follow the SDS supplied with your lot.
Pack sizes
| 500 g | Quoted on request | |
| 5 kg | Quoted on request | |
| 4 x 25 kg | Quoted on request |
Need a different size? Bulk drums and custom packing are quoted on request through the quote form on this page.
Questions about Potassium metabisulphite, 95%
Which CAS number identifies Potassium metabisulphite, 95%?
Potassium metabisulphite, 95% is registered under CAS 16731-55-8. You may also see it listed as Potassium disulfite, Potassium pyrosulfite, Dipotassium pyrosulfite. Our catalogue number for this item is ZX-013106.
What are the formula and molar mass of Potassium metabisulphite, 95%?
For Potassium metabisulphite, 95%, its formula is K2O5S2 and its molar mass is 222.33 g/mol. InChIKey RWPGFSMJFRPDDP-UHFFFAOYSA-L lets you match it in any structure database.
What grade and pack sizes are available for Potassium metabisulphite, 95%?
This listing is 98% purity. Standard packs are 500 g, 5 kg, 4 x 25 kg. Larger quantities and custom packing can be quoted on request.
Which documents come with Potassium metabisulphite, 95%?
Each lot ships with a batch certificate of analysis and a 16-section GHS safety data sheet. A typical COA or specification sheet can be shared with the quotation before you order.
Can Zemixal ship Potassium metabisulphite, 95% to my country?
Yes. Because Potassium metabisulphite, 95% is classed as hazardous, it travels in UN-approved packaging as dangerous goods under IATA or IMDG rules, with the export paperwork your broker needs.
Other grades with CAS 16731-55-8
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