(1) combustion characteristics
The combustion characteristics of various plastics vary greatly, mainly depending on the shape (solid segment, film, plate, foam, molded shape, synthetic fiber particles and powder) and chemical composition of the products. Products that do not burn at all or stop burning after removing the fire source include asbestos-containing phenol, some PVC, nylon and some fluorocarbon. There is also a kind of products that burn easily, but burn slowly, and may or may not stop burning after removing the fire source. These plastic products contain formaldehyde (urea or phenol) and some ethylene derivatives. Products that can continue to burn without hindrance after the fire source is removed, including polystyrene, propylene, some acetate fibers, polyethylene, etc.
(2) Combustion products in plastic cups
Burning plastic cups will produce combustible gas, heat, flame and smoke. It will continue to burn after leaving the fire source, and the flame state is mainly yellow (yellow at the upper end and blue at the lower end); Plastic change state: melting and dripping, which strongly stimulates the smell of formaldehyde, and these substances also contain some deadly toxic gases.
Most plastic cups smoke when they burn. Under normal circumstances, urethane will emit thick smoke at flame or non-flame high temperature, which will make the surrounding visibility worse in a few seconds. When burning, it will produce a deadly gas, as well as an irritating gas.