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.
Flammability Limits in air
Gas @ 70°F(21.1°C),