Sodium Meta Silicate

Storage & Sensitivity: Ambient temperatures.

Physical State	Solid granules or powder
Colour	White
Odour	Odourless
Odor Threshold	Not Applicable
pH	12.7 (1% solution)
Melting Point/Freezing Point	1089°C
Initial Boiling Point and Boiling Range	>1200°C
Flash Point	Not Applicable
Evaporation Rate	Not Applicable
Flammability	Non-Flammable
Upper Flammable Limit	Not Applicable
Lower Flammable Limit	Not Applicable
Vapour Pressure (mm Hg, 20oC)	Not Applicable
Vapour Density (Air=1)	Not Applicable
Relative Density	Not Applicable
Solubility(ies)	Completely soluble in water. Decomposed by ethanol.
Partition Coefficient: noctanol/water	Not Availble
Auto-ignition Temperature	Not Availble
Decomposition Temperature	Not Availble
Viscosity	Not Availble
Explosive Properties	Not Availble
Specific Gravity (Water=1)	2.61
% Volatiles by Volume	Not Availble
Formula	Na2SiO3
Molecular Weight	122.062 g/mol

Solubility: Soluble in cold water. Hydrolyzes in hot water. Insoluble in acids, alcohol and salt solutions.

Production

Sodium metasilicate is made by adding caustic soda to liquid sodium silicate to obtain an equal molar ratio of sodium oxide (Na2O) to silicon dioxide (SiO2).  The resulting metasilicate liquor is then cooled to crystallize the pentahydrate product or passed through a dryer to remove water and yield the anhydrous product. 

Chemical Identity

Name:  Sodium Metasilicate Chemical Abstracts Service (CAS) number:  6834-92-0.