Sodium metabisulfite CAS 7681-57-4

Product name:Sodium metabisulfite
CAS：7681-57-4
MF：H2O5S2.2Na
MW：192.12
EINECS:231-673-0

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Model:
7681-57-4
Brand:
futurechem
Code:
7681-57-4

Product Description

Product Description

Product name:Sodium metabisulfite

CAS：7681-57-4

MF：H2O5S2.2Na

MW：192.12

EINECS:231-673-0

Applicatiuon：

The pharmaceutical industry is used to produce chloroform, phenylpropyl sulfone and benzaldehyde. Used as coagulant in rubber industry. In the printing and dyeing industry, it is used as a dechlorination agent after bleaching cotton cloth and as a scouring aid for cotton cloth. Used in the tanning industry to treat leather to make it soft and plump. In the chemical industry, it is used to produce hydroxyvanillin, hydroxylamine hydrochloride, etc. In photosensitive industry, it is used as developer, etc.

Specifications :

ITEM	SPECIFICATION	TEST RESULT
PURITY(AS Na2S2O5 ):	97.0%MIN	97.26%
SULFUR DIOXIDE(SO2):	65.0%MIN	65.53%
HEAVY METALS(As Pb):	0.0005%MAX	0.00015%
WATER INSOLUBLE:	0.05%MAX	0.02%
IRON(Fe):	0.003%MAX	0.0013%
PH VALUE:	4.0-4.8	4.4

公司信息

Sodium metabisulfite CAS 7681-57-4 2Na.O5S2

Quality Assurance

Full-Process Quality Control: From incoming raw material inspection to in-process monitoring and final outgoing checks, every batch is inspected at each production stage against strict acceptance standards.
Third-Party Certified & Tested: Our quality management system is certified to ISO 9001, and products are regularly tested by accredited laboratories (e.g. SGS, TÜV). Test reports are available on request.
100% Batch Traceability: Each batch carries a unique lot number that links raw material records, production parameters, and test results, enabling complete traceability from factory to final delivery.
Pre-Shipment Inspection: Every order passes a final pre-shipment inspection, with inspection photos and reports shared before dispatch.

FAQ From Customers

Q1: What is the minimum order quantity?

A: There is no quantity limit for the first sample or trial order. Just tell us the actual quantity you need.
Q2: How can I confirm that the quality meets the requirements?

A: Provide your specifications, and our technical team will check them or customize them for you; we can provide TDS, MSDS, and COA, and accept third-party testing.
Q3: How do you ensure stable quality?

A: We manufacture under an ISO 9001 quality system, test every batch before release, and retain samples for 24 months for traceability.
Q4: Do you provide samples?

A: Yes — Free samples are available; freight is at buyer's expense for express delivery.