Calcium oxide has high flame retardant properties in plastics

The thermal decomposition temperature of calcium oxide is above 800℃, while the general plastics are flammable, 

and their ignition temperature is around 400℃, so it is impossible to hope that the decomposition of calcium oxide 

will release carbon dioxide during the initial combustion stage. The advantage of the presence of calcium oxide only

 lies in the reduction of the amount of combustible material, and the higher the content of calcium oxide, the less 

combustible material in the same volume, which is of course conducive to flame retardation. However, due to the 

presence of calcium oxide, polymer materials combustion process of rapid expansion and gasification of the formation 

of countless microporous, greatly increasing the surface area of the combustible material in contact with oxygen, so that

 more combustible material to participate in the combustion and further increase the temperature of the fire area, more

 conducive to the expansion of the combustible material with the gasification of the results of the vicious circle, so that 

calcium oxide as a non-combustible material's contribution to the negligible. In the 1990s Japan and other countries and

 regions took the lead in the polyethylene garbage bags to add 30% of heavy calcium, is out of the incinerator calcium 

oxide is conducive to polyethylene combustion considerations.

　Experiments have shown that 100g of polyethylene film containing 30% calcium oxide and 1% incineration of thermal 

oxygen degradation agent requires only 4 seconds to burn completely, while the same weight of pure polyethylene film 

requires 12 seconds to burn completely, a threefold difference between the two!