Package: In inner plastic bag, outside woven bag

Uses : Sodium metabisulfite purposes: industry used in printing and dyeing, organic synthesis, printing, leather, pharmaceutical and other department. In the food processing as preservative, bleach...

Molecular Structure:

Product description:

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
	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
	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.

Packing photo:

1000kg Jumbo bag	25kg P.P woven bag
25kg Kraft paper bag	25kg PE bag