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Sodium Metabisulfite

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Post Date:

Apr 15,2025

Expiry Date:

Oct 12,2025

Detailed Description:

Cas No. :7681-57-4

Property: white or light yellow crystal powder, a strong smell of sulfur dioxide,relative density is 1.4, easy to dissolve in water and glycerin, water solution. It has acidity,and its solubility will become large while raising the temperature and is less to dissolve in ethanol.
Molecular Formula : Na₂S₂O₅

Molecule Weight : 190.12

CAS NO .: 7681-57-4

Appearance : White Free Flowing Fine Crystal or Powder

Packing: Packed in 25kg plastic woven bag, 25kg Kraft paper bag, 25kg PE bag, 500kg/1000kg/1100kg/1200kg jumbo bag or as per the buyer's requirement.

Specification For Food Grade and Industry Grade :

Item	Quality Index
Item	Food Grade	Industry Grade
Purity ( As Na₂S₂O₅)	98.0% min	96.0% min
Sulfur Dioxide( SO₂)	65.0% min	65.0% min
Arsenic ( As )	0.0002% max	-
Heavy metals ( As Pb )	0.0005% max	-
Selenium (Se )	0.0005% max	-
Iron (Fe)	0.001% max	0.002% max
Water insoluble	0.02% max	0.05% max
PH value :	4.0-4.8	4.0-4.8
Remark :	Conformed with FCC V and E 223 Standard

Specification for Pharmaceutical Grade and Photo Grade

Item	Quality Index
Item	Pharmaceutical Grade	Photo Grade
Purity ( As Na₂S₂O₅)	98.0% min	98.0% min
Sulfur Dioxide( SO₂)	65.0% min	65.0% min
Thiosulphate ( As S₂O₃) :	0.05 % max	0.05% max
Chloride ( As CL^-) :	30 ppm max	50ppm max
Arsenic ( As ) :	1ppm max	1ppm max
Lead ( Pb ) :	1 ppm max	2ppm max
Copper (Cu) :	1 ppm max	1ppm max
Iron (Fe ) :	5 ppm max	5ppm max
Mercury (Hg) :	0.1ppm max	1ppm max
Chromium (Cr) :	1 ppm max	-
Selenium (Se ) :	1 ppm max	5ppm max
Zinc (Zn)	1 ppm max	1ppm max
Cadmium (Cd )	1ppm max	-
Nickel (Ni)	1ppm max	-
Na₂SO₃ + Na₂SO₄	1.5% max	-
PH value :	4.0-4.8	4.0-4.8
Remark :	Conformed with USP standard

Application:

(1) Food Grade: Bleach agent (e.g. candies, cake, bamboo shoots, etc); Loose agent (e.g. bread, cracker etc); Antiseptic and germicide (e.g. fruit juice, tinned food, brews, the cereals food is defended storage etc); Inhibitor and freshen agent (e.g. day lily, seafood, fruit and vegetable etc).

(2) Industry Grade: Mordant of printing and dyeing; Dechlorinate of textile after bleaching; Sulphonated agent and reducer of chemical industry and pharmacy; Bleach of paper pulp, bamboo and timber bleach of Stap; Treatment agent of waste water; Rubber solidifying agent Perfume industry is served as hydro carbon perfume aldehyde
The hide profession employ to do to molt dose and pliable dose and wearproof dose; sewage treatment, and so on .

(3) Pharmaceutical Grade: In chemical synthesis in the production of acrylic fibre, vitamin K, vitamin A, pharmaceutical intermediates, etc.

(4) Photo Grade: The sensitize industry is served as the developing agent reductant and the protection of fixing bath dose.

Storage: Store the product in a dry and cool place.

CAS Registry Number:	7681-57-4
Synonyms:	;Sodium pyrosulfite;disodium disulphite;Sodium metabisulphite;Sodium disulphite;Sodium pyrosulphite;SODIUM DISULFITE;disodium oxidosulfanesulfonate oxide;Sodium Metabi;Metabisulfite Sodium;Sodium Metabisulfite (Food Grade);
Molecular Formula:	Na₂S₂O₅
Molecular Weight:	190.1065
Molecular Structure:
Hazard Symbols:	Xn:Harmful;
Risk Codes:	R22:; R31:; R41:;
Safety Description:	S26:; S39:; S46:;

Company:	Weifang Zhisheng Chemical Co., Ltd. [ China ]
Contact:	Manager Du
Tel:	+86-536-8224688
Fax:	+86-536-8224688
Email:	sales@zhishengchem.com

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Wuxi city Hongxing Chemical Industry Factory 2021-11-20

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Sodium Metabisulfite

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7681-57-4