Silane SiH4 is a colorless gas with a foul odor at room temperature and pressure.
It can catch fire at room temperature; it can burn explosively in air or halogen gas. Even if diluted with other gases, it can still spontaneously combust if the concentration is not low enough. Silane can still catch fire when it contains 2% in argon, 2.5% in nitrogen, and 1% in hydrogen. Silane concentration is non-flammable when it is less than 1%, spontaneously combusts when it is greater than 3%, and may burn when it is 1% to 3%.
It can be said that it is a "grumpy brother", and it is confirmed!
It is also a very toxic special gas. How strong is it?
Contact with silane can cause eye irritation. Inhalation can cause headaches, nausea, and irritation of the mucous membranes and respiratory tract. Although silane is reported to have a nasty odor, it cannot be used as a warning sign of the presence of dangerous concentrations of gas. By the time you smell it, you have already been infected.
Studies have shown that the threshold limit exposure to silane in an occupational environment is 5 ppm, which has been determined by the American Conference of Governmental Industrial Hygienists (ACGIH) and adopted by the U.S. Occupational Safety and Health Administration (OSHA). A four-hour inhalation Lclo (rat) of 9600 ppm has been determined. Silane burns to produce silicon oxide, which can cause respiratory irritation.
It can be said that the main danger of silane comes from its ability to spontaneously combust in contact with air and its toxicological properties.
Knowing so much, do you still dare to carelessly expose the gas cylinder containing silane SiH4 to the air?
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