0
|
Material that in itself is normally stable, even under fire
exposure conditions, and is not reactive with water. |
Example: liquid nitrogen |
1
|
Material that in itself is normally stable, but which can become
unstable at elevated temperatures and pressures. |
Example: phosphorus (red or white) |
2
|
Material that readily undergoes violent chemical change at
elevated temperatures and pressures or which reacts violently with
water or which may form explosive mixtures with water. |
Example: calcium metal |
3
|
Material that in itself is capable of detonation or explosive
decomposition or reaction but requires a strong initiating
source or which must be heated under confinement before
initiation or which reacts explosively with water. |
Example: fluorine gas |
4
|
Material that in itself is readily capable of detonation or of
explosive decomposition or reaction at normal temperatures and pressures. |
Example: trinitrotoluene (TNT) |
Safety in the Chemistry Laboratory