A pyrophoric substance is a substance that ignites spontaneously, that is, its autoignition temperature is below room temperature. Examples are methanetellurol (CH3TeH), and many reactive metals including uranium, when powdered. The autoignition temperature of a substance is the lowest temperature at which it will spontaneously combust in a normal atmosphere, without an external source of ignition, such as a flame or spark. ... Room temperature, in laboratory reports, is taken to be roughly 21–23 degrees Celsius (70 degrees Fahrenheit), or 294–296 kelvins. ... For alternative meanings see metal (disambiguation). ... Jump to: navigation, search hello everyone! ...
Pyrophoric preparations made of crushable open-celled metal skeleton such as honeycomb, metal foam or expanded twisted foil, filled with pyrophoric powder, so that when crushed to make a compact disc the metal skeleton is deformed and helps lock the powder particles in place.
The combination of claim 1 in which the metal is combustible and the pyrophoric powder is sufficient to cause the metal to be raised to its combustion temperature by the pyrophoric reaction of the powder.
The present invention relates to pyrophoric preparations, and particularly to such preparations in which the pyrophoric character is contributed by pyrophoric powder.
Many pyrophoric chemicals release noxious or flammable gases and should be handled in a hood. In addition, some pyrophoric materials are stored under kerosene (or other flammable solvent), therefore the use of a fume hood is required to prevent the release of flammable vapors into the laboratory.
Gloves should be worn when handling pyrophoric chemicals. The selection of glove materials should be made according to the MSDS and the recommendations of the glove manufacturer.
Pyrophoric chemicals should be stored under an atmosphere of inert gas or under kerosene as appropriate. Do not store pyrophoric materials with flammable materials or in a flammable-liquids storage cabinet. Store these materials away from sources of ignition. Minimize the quantities of pyrophoric chemicals stored in the laboratory.
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