Specification of Sodium Meta Silicate –Pentahydrate  

CAS NO.

10213-79-3 (Pentahydrate)

EINECS NO.

229-912-9

Formula

SiO3Na2•5H2O

Mol Wt

212.74 

H.S.Code

2839.19

Synonyms

Metso Beads, Silicic acid, disodium salt; Sodium-m- Silicate;  Orthosil; Disodium metasilicate; Disodium  Monosilicate; Waterglass; Disodium trioxosilicate; 

Physical And Chemical Properties

Physical State

White granule

Solubility In Water

Soluble in cold water.Hydrolyzes in hot water

pH

12.3 - 12.5 (1% Solution)

Flash Point  

Not considered to be a fire hazard

Stability  

Stable under ordinary conditions

Appearance

white granules

SiO2

28.5 ± 1.0%

Na2O  

28.5 ± 1.0%

H2O

45.5 ± 1.0%

Fe

100ppm max