Sodium metabisulfite (CAS 7681-57-4) — formula Na2O5S2, molecular weight 189.90 g/mol; category fine chemicals.
Sodium metabisulfite (CAS 7681-57-4) is a chemical raw material in the fine chemicals category. Its molecular formula Na2O5S2 comprises 2 Na, 5 O, 2 S atoms. Its molecular weight is about 189.90 g/mol. As a sourcing and distribution partner we help locate and compare this item across domestic and cross-border channels, arranging samples and batch orders with full COA and compliance files.
| CAS Number | 7681-57-4 |
|---|---|
| Molecular Formula | Na2O5S2 |
| Molecular Weight | 189.90 g/mol |
| Packaging | 25/50kg woven bags, 20/25/50kg fibre drums, 200kg plastic drums, 1000kg IBC (subject to order confirmation) |
| Applications | 典型应用领域：化工原料。规格/纯度：以批次 COA 为准。包装：25/50kg 编织袋, 20/25/50kg 纸板桶, 200kg 塑料桶, 1000kg IBC（以订单确认为准）。储存：阴凉干燥, 密封保存, 开封后尽快使用。样品 10~100g 或 100~500g |
| Category | Fine Chemicals|Basic Chemical Raw Materials |
Documented applications: 典型应用领域：化工原料。规格/纯度：以批次 COA 为准。包装：25/50kg 编织袋, 20/25/50kg 纸板桶, 200kg 塑料桶, 1000kg IBC（以订单确认为准）。储存：阴凉干燥, 密封保存, 开封后尽快使用。样品 10~100g 或 100~500g.
Sodium metabisulfite is a high-value fine compound with CAS registry number 7681-57-4 and molecular formula Na2O5S2 (molecular weight 189.90 g/mol), belonging to the fine chemicals segment of chemical raw materials.
CAS number: 7681-57-4
Its molecular formula Na2O5S2 comprises 2 Na, 5 O, 2 S atoms.
Also known as: Sodium metabisulfite · 焦亚硫酸钠
Category: fine chemicals / fine chemicals
The CAS registry number of Sodium metabisulfite is 7681-57-4.
Molecular formula Na2O5S2, molecular weight 189.90 g/mol.
It is also registered under: Sodium metabisulfite, 焦亚硫酸钠.
Recorded applications: 典型应用领域：化工原料。规格/纯度：以批次 COA 为准。包装：25/50kg 编织袋, 20/25/50kg 纸板桶, 200kg 塑料桶, 1000kg IBC（以订单确认为准）。储存：阴凉干燥, 密封保存, 开封后尽快使用。样品 10~100g 或 100~500g.
Category: Fine Chemicals / Basic Chemical Raw Materials.
Packaging is agreed per order, from lab-scale packs to bulk, and confirmed with each order rather than fixed on the page. A Certificate of Analysis (COA) ships with every batch and MSDS is available; where the end use carries a regulatory limit (food contact, pharmaceutical or cosmetic), state the standard at enquiry and the grade is set against it.
Independent reference data for Sodium metabisulfite (CAS 7681-57-4), compiled from public chemistry databases.
| CAS Registry Number | 7681-57-4 |
|---|---|
| PubChem CID | 656671 |
| Molecular formula | Na2S2O5 |
| UNII (FDA) | 4VON5FNS3C |
| Molecular Weight | 190.11 |
|---|---|
| Hydrogen Bond Donor Count | 0 |
| Hydrogen Bond Acceptor Count | 6 |
| Rotatable Bond Count | 0 |
| Exact Mass | 189.89825401 |
| Monoisotopic Mass | 189.89825401 |
| Topological Polar Surface Area | 125 |
| Heavy Atom Count | 9 |
| Solubility | 54 % (NIOSH, 2024) |
|---|---|
| Solubility | 66.7 g/100 g water at 25 °C |
| Solubility | 54% |
| Density | 2.36 g/cm³ |
| Density | 1.4 |
| Density | 1.4 @25 °C |
| LogP | -3.7 |
| Decomposition | 150 °C |
| pH | 4,0-5,5 (10 % aqueous solution) |
Sodium metabisulfite; 7681-57-4; Sodium pyrosulfite; Sodium disulfite; Disodium pyrosulfite; Natrii disulfis; Campden Tablets; Disodium metabisulfite; Natrium pyrosulfit; Natriummetabisulfit; sodium pyrosulphite; Sodium bisulfite anhydrous; Natrium metabisulfurosum; Sodium pyrosulfite (Na2S2O5); Disodium pentaoxodisulfate; 4VON5FNS3C
| Regulatory & Food Contact | FDA Substance added to food: ANTIMICROBIAL AGENT, ANTIOXIDANT, COLOR OR COLORING ADJUNCT, DOUGH STRENGTHENER, ANTIOXIDANT; FLOUR_TREATMENT_AGENT; PRESERVATIVE: Food Additives ANTIMICROBIAL AGENT, ANTIOXIDANT, COLOR OR COLORING ADJUNCT, DOUGH STRENGTHENER, FLOUR TREATING AGENT, FREEZIN JECFA ADI: 0-0.7 mg/kg bw TRS 891-JECFA 51/30 FAS 42-JECFA 51/95 |
|---|---|
| GHS notification summary | 0.4% (11 / 3060) |
| GHS notification summary | 0.4% (11 / 3060) |
|---|---|
| Reported hazard statements | H302, H318, H317, H334, H335, H402, H412, H320 |
H302: Harmful if swallowed [Warning Acute toxicity, oral]
H318: Causes serious eye damage [Danger Serious eye damage/eye irritation]
Sodium Metabisulphite Food Grade · CAS 7681-57-4 · Na2S2O5. UNII 4VON5FNS3C. Solubility: 54 % (NIOSH, 2024); Solubility: 66.7 g/100 g water at 25 °C; Solubility: 54%.
Source: PubChem / Wikidata; the batch COA governs where values differ.
Supplier: Jinan Shenghe Chemical Co., Ltd.
中文页面: 焦亚硫酸钠