| General Characteristics |
Silicon Tetrafluoride is a colorless, toxic, nonflammable gas with a suffocating odor. It is irritating to the mucous membranes. Silicon Tetrafluoride forms fumes in humid air, and hyrolyses rapidly to form fluorosilicic acid and hydrogen fluoride. It is shipped as a free gas, and the contents vary with the pressure. |
| |
| Physical Properties |
| Molecular Weight |
104.08 |
| Flammability Limits in air |
Nonflammable |
Specific Gravity,
Gas @ 70°F(21.1°C), 1 atm(Air=1) |
3.55 |
Density,
Gas @ 70°F(21.1°C), 1 atm |
0.266lb/ft^3 (4.26g/l) |
Specific Volume,
Gas @ 70°F(21.1°C), 1 atm |
3.76ft^3/lb (0.23l/g) |
| Sublimation Point @ 1 atm |
-139.2°F (-95.1°C) |
| Freezing Point @ 1 atm |
-130°F (-90°C) |
| Critical Temperature |
6.5°F (-14.2°C) |
| Critical Pressure |
538.8 psia (37.2 bar) |
| Toxicity (as HF, a 4 to 1 ratio) |
| PEL/TLV |
3 ppm |
| STEL |
6 ppm |
| LC50 |
450 ppm |
| IDLH |
38 ppm |
