The current national standard "building materials and products of combustion classification performance GB8624, building materials and products can be divided into class A non-combustible material (and products), B1 level flame retardant materials and products), B2 combustible materials (and products), B3 level flammable materials (and products).

Heat preservation material combustion performance level should comply with the design requirements, design selection is not only to meet the requirements of thermal performance of the heat preservation material, also should comply with the regulations of fire protection design. To avoid the fire, the current national standard "building materials and products of combustion classification performance GB8624 besides stipulates the combustion performance of heat preservation material classification method, at the same time of foam insulation materials and oxygen index requirements: B1 level oxygen index value OI 30% or higher; According to the standard for the current national standard "plastic oxygen index method is used to test the combustion behavior part 2: test at room temperature," GB/T2406.2.

A large amount of oxygen index verification test show that B1 level of polyurethane and EPS thermal insulation material basic can reach 30, oxygen index XPS heat preservation material to take corresponding measures to achieve. Table 1 is common on the market of several representative insulation materials combustion performance and oxygen index test results.

Insulation materials in accord with combustion performance at the same time, its physical and chemical properties must also comply with the design requirements. Density, thickness and strength of insulation materials, thermal conductivity performance indexes such as the effect of heat preservation and heat insulation is related to its key factors, these performance shall conform to the requirements of relevant standards, including product acceptance standards, design specifications, etc.