L1 /
17
CH3041
CHARACTERISTICS OF
DIFFERENT KINDS OF SUBSTANCE
DIFFERENT KINDS OF SUBSTANCE
1) Flammable & Combustible liquids
Flash point: an ignitable liquid is heated in steps and exposed to a flame. At some T the vapour / air ratio is sufficient for ignition to occur at the liquid surface.
Flash point: an ignitable liquid is heated in steps and exposed to a flame. At some T the vapour / air ratio is sufficient for ignition to occur at the liquid surface.
Flammable
liquid: flash
point < 60.5oC
Combustible liquid: 60.5oC
< flash point < 93.5oC
Diethyl
ether f.p. -43oC Acetone f.p. -20oC
Toluene f.p. 4oC
Methanol f.p. 12oC
Naphthalene f.p. 157oC
2)
Pyrophoric substance (type of flammable)
These
substances catch fire without an ignition
source eg. white phosphorus, Na.
