Sodium pyrosulfite

Sodium pyrosulfite

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 焦亚硫酸钠 Sodium pyrosulfite

Also known as:disodiummetabisulfite; disodiumpyrosulphite; fertisilo; metabisulfitedesodium; Sodiummetabisufite; sodium-metabisulfite(na2-s2o5);sodiumpyrosulfite(na2s2o5); Sodium dissulfite; Sodium disulphite; Sodium pyrosulphite

Molecular Formula:  Na2S2O5  Molecular Weight: 190.10   Quality Standard: Industrial Grade:HG/T2826-2008   Food Grade: GB1893-2008
CAS Number:  7681-57-4 Appearance:  white or slightly yellowish crystalline powder
Packaging: Polyethylene textile bag (outside), polyethylene plastic bag (lining); net weight 25kg/bag, 1000kg/bag or 1100kg/bag (customizable).
Application: It can be used as a mordant in printing and dyeing, dechlorinating agent after fabric bleaching, bamboo, wood and paper fiber bleach, as well as chemical and pharmaceutical reducer and sulfonating agent; ore-dressing agent for non-ferrous metal; germicide anticorrosive agent for food preservation, brewing industry and beverages, hydrocarbyl perfume aldehyde in perfume industry, wastewater disposal agent; leather treating, softening and wear-resistant agent in leather industry; rubber coagulator; in photographic material industry, it is used as a reducing agent for developers and a protective agent for fixing solution.
Precautions for transportation and storage: Transportation: prevent rain, moisture, sun exposure and packaging damage; it must not be stored or transported together with acids, oxidants and toxic and hazardous substances. Storage: stored in a ventilated, dry, corrosion-free warehouse. It is easy to decompose when affected with damp, and it is vulnerable to oxidative degeneration and will continuously give off SO2 gas when exposed in air, so it should not be stored for a long time.


Items
National Standard GB1893-2008
Usual Values
Main content (Na2S2O5), %
≥96.5
≥97.5
Iron content (Fe), %
≤0.003
≤0.0015
Clarity
Passes test
Clear
Heavy metal content (Pb), %
≤0.0005
≤0.0002
Arsenic content (As), %
≤0.0001
≤0.0001



Items Indicators
Main content (Na2S2O5), % ≥98
Iron content (Fe), % ≤0.001
Clarity Clear
Insoluble matter content, % ≤0.01
Heavy metal content (Pb), % ≤0.0005
Arsenic content (As), % ≤0.0001
PH value 4.2~4.8



Items Indicators
Main content (Na2S2O5), % ≥99
NaCl content, % ≤0.010
Iron content (Fe), % ≤0.0005
Insoluble matter content, %span> ≤0.005
Clarity Clear
Arsenic content (As), % ≤0.00005
Heavy metal content (Pb), % ≤0.00005
The above products are all in line with the United States Pharmacopoeia (USP), the British Pharmacopoeia (BP), and the Chinese Pharmacopeia (CP).



Items

National Standard HG/T2826-2008

Usual Values

Premium Grade

First Grade

Main content (Na2S2O5), %

≥96.5

≥95.0

≥97.0

Iron content (Fe), %

≤0.005

≤0.010

≤0.002

Insoluble matter content, %

≤0.05

≤0.05

≤0.02

Arsenic content (As), %

≤0.0001

≤0.0001









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