Microsilica

COMPOSITION/INFORMATION ON INGREDIENTS

Item

WT.%

CAS Registry#

Silicon Dioxide (SiO2) amorphous

>75%

69012-64-2

Carbon(C)

<10%

7440-44-0

Silicon Dioxide(SIO2)Crystalline

<0.5%

14808-60-7

PHYSICAL AND CHEMICAL PROPERTIES

Physical State:

Ultrafine amorphous powder (respirable dust),dust forms agglomerates
Color:  Light to dark gray
Odor: Odorless
Solubility (Water): Insoluble to slightly soluble.
Melting Point (C): Approx. 1230
Solubility (Organic solvents) Insoluble to slightly soluble.
Specific Gravity (water=1) 2.2-2.3
Bulk density (kg/m3) approx  400-700
Particle size (m) Approx 0.3

STABILITY AND REACTIVITY

STABILITY:

Microsilica is stable and does not react with water.

MATERIALS TO AVOID:

Avoid contact with hydrofluoric acid and fluorides

HAZARDOUS REACTIONS:

Microsilica reacts with hydrofluoric acid (HF) forming toxic gas (SiF4).

HAZARDOUS DECOMPOSITION PRODUCTS:

Prolonged heating above 500C (930F) will convert amorphous silica to the crystalline

phases. See Section 11.