They have been adopted by several Canadian governments and others as their legal limits. A flammable liquid has a flashpoint below 37.8oC. 4. This may occur from friction, absorbing moisture, from spontaneous chemical change, or by retaining heat from manufacturing or processing. The flame then travels back along the trail of gas, vapour or aerosol to its source. These chemicals may be flammable, toxic or have other hazards.
Uncontrolled polymerization can be extremely hazardous.
Some polymerization processes can release considerable heat or can be explosive. International Agency for Research on Cancer. It is usually expressed in air concentration in ppm of material per weight of test animal. LC stands for lethal concentration. It is usually expressed in weight of material per weight of test animal.