|
sodium meta-bisulfite
Synonym:
Sodium Pyrosulfite
Formula: Na2S2O5
M.W.:190.10
Grade: industrial
Description:White or slightly yellow granular powder with
the odor of sulfa dioxide,soluble in water,water solution is alkaline
in reaction:It will be turned into Na2SO4 when
exposed to air.
Specification:
Content
(as SO2)  |
65%
|
Insoluble
matter in water |
0.05%
|
| Fe |
0.005%
|
| pH |
4-4.6
|
Uses:
Photographic developer,Chrome tanning of leather,Manufacture of
dyes and chemicals,Dyeing of textiles,Antichlor in bleaching(cotton,Wool,fibre,etc.),Preservative
for food,Deal with waste water containing with chrome,Reducing agent
for chemical,Handle latex emulsion,Rayon,Paper,medical industries.
Packing:In 25/50kg net glass fibre woven bags lined with
PVC bags.
sodium bisulfite
M.F.: NaHSO3
M.W.: 104.06
Grade: industrial
Properties: clear monoclinic crystal or white crystalline
powder; sulfa dioxide odor; specific density: 1.48; dissociate upon
heating; water soluble; acidic aqueous solution; slightly soluble
in alcohol; readily oxidized into sodium sulfate in air; strongly
reductive; form adduct with formaldehyde; storage: tightly sealed
and avoid light.
Standard: IS:248-1971
Specifications:
Applications:
in photographic developer, preservative for food, electrobath
for electroplating of copper; for bleaching of organic products,
chemical synthesis etc.; as reductant; in pesticide etc.
Packing: 25/50kg N.W. in knitted bag lined with PVC bag.
premium
sodium pyrosulfite
Product Quality:
| premium
sodium pyrosulfite |
|
item
|
premium
grade
|
| purity
% |
98
|
| iron
(Fe) % |
0.001
|
|
chloride
(Cl) %
|
0.02
|
| heavy
metal (in Pb) % |
0.001
|
| water
insoluble substance % |
0.01
|
| sulfate
(in Na2SO4) % |
1.45
|
| arsenic
(As) % |
0.0002
|
| color
number |
20
|
| pH
(10% solution) |
3.2-4.5
|
food
additive grade sodium pyrosulfite
Appearance:
white or slightly yellow crystalline powder
Applications: as preservative, bleach or loosener for food
Product Quality:
|
item
|
value
|
| sodium
pyrosulfite (in SO2) % |
65.0
|
| iron (Fe),
% |
0.005
|
| water
insoluble substance % |
0.05
|
| pH |
4.0-4.6
|
| heavy metal
(in Pb) % |
0.002
|
| arsenic
(As) % |
0.0002
|
|
