Sodium metabisulfite

Name: Sodium metabisulfite
Brand: 济南圣和化工有限公司

CAS 7681-57-4Na2O5S2MW 189.90 g/mol

Sodium metabisulfite（CAS 7681-57-4）属Food Additives类产品，分子式 Na2O5S2，分子量 189.90 g/mol。济南圣和化工有限公司常年现货供应该产品，常规纯度按批次COA提供(不公开发布)，可按客户需求安排分装包装，欢迎邮件或来电询价。

产品概览

CAS号	7681-57-4
分子式	Na2O5S2
分子量	189.90 g/mol
纯度	按批次COA提供(不公开发布)
包装	按订单/批次确认(不公开发布)
应用领域	Food Additives；Bleaching Agents；Basic Chemical Raw Materials
类别	Food Additives\|Bleaching Agents\|Basic Chemical Raw Materials

应用领域

Food Additives；Bleaching Agents；Basic Chemical Raw Materials

目前 Sodium metabisulfite 主要服务于Food Additives与Bleaching Agents两大方向。我们可按应用场景提供不同规格，随货 COA 列明实测指标，方便您做入厂检验比对。

包装与储存

包装规格按订单/批次确认(不公开发布)

纯度规格按批次COA提供(不公开发布)

储存条件密封、阴凉干燥处保存

运输常规化工运输

样品可协商提供

交期现货/按订单安排

采购提示：本产品按按订单/批次确认(不公开发布)起订发货，收到货物后请先核对包装完好性再行入库。储存条件为阴凉干燥、密封保存；如需 MSDS 或运输说明，可在询价时一并索取。

质量与文件

每批产品随货提供 COA（分析证书）；可按需提供 MSDS/技术数据表及第三方检测报告。纯度与包装以批次 COA 及订单确认为准。

关于供应商

济南圣和化工有限公司位于山东济南，主营化工原料供应，精选产品齐全，覆盖有机化学品、无机化学品、食品添加剂、医药中间体等多个大类。我们随货提供 COA 分析证书，一个工作日内回复报价，欢迎国内外采购方长期合作。

常见问题

Sodium metabisulfite 的 CAS 号是多少？

Sodium metabisulfite 的 CAS 号为 7681-57-4。

该产品的纯度和包装规格是什么？

常规纯度规格为按批次COA提供(不公开发布)，包装为按订单/批次确认(不公开发布)，随货提供 COA。

Sodium metabisulfite 有什么用途？

主要应用于Food Additives；Bleaching Agents；Basic Chemical Raw Materials。

如何购买或获取报价？

请发送邮件至 info@591daili.com 或通过 WhatsApp 联系，注明产品名称、CAS 号与需求数量，一个工作日内回复报价。供应商：济南圣和化工有限公司。

PubChem 公开数据

Description

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%.

Identification

CAS Registry Number	7681-57-4
PubChem CID	656671
Molecular formula	Na2S2O5
UNII (FDA)	4VON5FNS3C

Computed Descriptors

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
Formal Charge	0
Complexity	136

Physical & Chemical Properties

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)

Physical description & handling notes

Sodium metabisulfite appears as a white crystalline or powder solid with a slight sulfur odor. Toxic by inhalation. Strongly irritates skin and tissue. Noncombustible, but may decompose to emit toxic oxide fumes of sulfur and sodium when heated to high temperature. A corrosive acid when mixed with water. Used as a food preservative and as a laboratory reagent.
Dry Powder; Other Solid; Wet Solid; Large Crystals; CBI; Liquid
White crystals or crystalline powder
White to yellowish crystals or powder with an odor of sulfur dioxide; [NIOSH]
WHITE POWDER WITH CHARACTERISTIC ODOUR.
White to yellowish crystals or powder with a slight odor of sulfur.

Regulatory Status

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 Hazard Classification

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]

Documented Uses

CIR ingredient: Sodium Metabisulfite
Sodium and potassium metabisulfite are used as antioxidants in photographic film development. [Kanerva, p. 1637] Used as an antioxidant (food preservative, pharmaceutical aid, silage preservative; [HSDB] Used in the pickling stage of leather production; [PMID 21938525]
Leather Tanning and Processing [Category: Industry]
Photographic Processing [Category: Other]
Sodium Metabisulfite functions as reducing agents in cosmetic formulations. ... Sodium Bisulfite, and Sodium Metabisulfite /also/ function as antioxidants.
In foods, as preservative; lab reagent

Synonyms

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

Frequently Asked Questions

What are the CAS number and molecular formula of Sodium Metabisulphite Food Grade?

CAS 7681-57-4; molecular formula Na2S2O5; molecular weight — g/mol.

What other names is Sodium Metabisulphite Food Grade known by?

Sodium metabisulfite, 7681-57-4, Sodium pyrosulfite, Sodium disulfite, Disodium pyrosulfite, Natrii disulfis.

What is the regulatory status of Sodium Metabisulphite Food Grade?

Documented regulatory listings: 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.

Is Sodium Metabisulphite Food Grade classified as hazardous?

0.4% of GHS notifications report no hazard classification (11 of 3060).

What are the key physical properties of Sodium Metabisulphite Food Grade?

Solubility: 54 % (NIOSH, 2024); Solubility: 66.7 g/100 g water at 25 °C; Solubility: 54%; Density: 2.36 g/cm³.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.