PHYSICAL STATE
white crystalline powder with odor of sulfur dioxide
MELTING POINT
150 C (Decomposes)
BOILING POINT
SPECIFIC GRAVITY
1.48
SOLUBILITY IN WATER
Freely soluble (470g/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 65.0% 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. Bisulfite 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 sterlization of equipment.
SALES SPECIFICATION
TECH GRADE
APPEARANCE
White to slightly yellowish crystalline powder
CONTENT
98.0% min
SO2
65.0% min
Na2S2O4
2.0% max
INSOLUBLES IN WATER
0.05% max
PARTICLE SIZE
85% (mesh 200)
4 -4.6
Fe
5ppm max
FOOD GRADE
HEAVY METALS
10ppm max
As
1ppm max
4.5 - 5.5
-
联系商家时请提及chemicalbook，有助于交易顺利完成！