タイトルまたは説明
We are a leading supplier & exporter of Sodium Metabisulfite
from China. We supply high quality products on wholesale price. We
also ensure purity of the chemicals we sell. Wanna buy, feel free
to contact us.
SODIUM METABISULFITE
PRODUCT IDENTIFICATION
CAS NO.
********4
EINECS NO.
********0
FORMULA
Na2S2O5
MOL WT.
**0.*0
H.S. CODE
TOXICITY
SYNONYMS
Dinatriumdisulfit; Disulfito de disodio; Disulfite de
disodium; Disodium disulfite; Disodium Salt Pyrosulfurous Acid;
Disulfurous acid, disodium salt; Pyrosulfurous acid, disodium salt;
Sodium Metabisulfite; Sodium disulfite; Sodium Pyrosulfite
DERIVATION
CLASSIFICATION
PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE
white crystalline powder with odor of sulfur dioxide
MELTING POINT
**0 C (Decomposes)
BOILING POINT
SPECIFIC GRAVITY
1.*8
SOLUBILITY IN WATER
Freely soluble (**0g/l)
pH
3.5 - 5
VAPOR DENSITY
AUTOIGNITION
NFPA RATINGS
Health: 1; Flammability: 0; Reactivity: 0
REFRACTIVE INDEX
FLASH POINT
STABILITY
Stable under ordinary conditions. Hygroscopic.
GENERAL DESCRIPTION & APPLICATIONS
Sodium Metabisulfite is a white to slightly yellowish crystalline
powder with sulfur dioxide odor; readily soluble in water. Sodium
metabisulfite containing more than *5.0% SO2 w/w releases sulfur
dioxide gas when mixed with water. It forms a bisulfite adduct with
aldehyde and with ketones to a sulfonic acid. It is used to purify
or isolate aldehydes and ketones. Sodium metabisulfite's reductive
and sulfonating properties provide versatile applications. It is
used as an oxygen scavenger to eliminate the dissolved oxygen in
waste water and in pipes.
Sodium Metabisulfite is a reductive bleaching agent. It reduces
carbonyl and alcohol groups, which function as colorants of the
substances. It is used in bleaching mechanical paper pulp, cotton,
wool and kaolin clay. Additional applications include as a
preservative (antioxidant), a hair waving agent, and Ensiling
agent. Bisulfites are used in industries concerned with leather
processing, food and beverage processing, gas purification, water
treatment to remove excess chlorine, textiles and pulp
processing, and many others. It is used as a reducing agent in
chemical manufacturing. It is an alternative to sulfur dioxide
which is used in sterilization of equipment.
SALES SPECIFICATION
TECH GRADE
APPEARANCE
White to slightly yellowish crystalline powder
CONTENT
*8.0% min
SO2
*5.0% min
Na2S2O4
2.0% max
INSOLUBLES IN WATER
0.*5% max
PARTICLE SIZE
*5% (mesh **0)
pH
4 *4.6
Fe
5ppm max
FOOD GRADE
APPEARANCE
White to slightly yellowish crystalline powder
CONTENT
*8.0% min
SO2
*5.0% min
Na2S2O4
2.0% max
INSOLUBLES IN WATER
0.*5% max
PARTICLE SIZE
*5% (mesh **0)
HEAVY METALS
*0ppm max
As
1ppm max
Fe
5ppm max
pH
4.5 - 5.5
TRANSPORTATION
PACKING
*5kgs in bag
