A study on flame-retardant properties of air filter paper for internal combustion engines

In order to improve the flame-retardant properties of air filter paper for internal combustion engines, the effect of different retention rate of APP flame retardant,Br-Sb synergistic flame retardant and their compound on fire-retardant effectiveness, mechanical properties and permeability of air filter paper were discussed by experiment. The results show that the flame-retardant properties can be satisfied with the requirements of GB/T14656-93 and smokeless when the retention rate of the compound flame retardant is 20%, and the ratio of APP and Br-Sb is 1:1. Meanwhile its stiffness essentially remains unchanged, and its bursting strength and permeability are reduced by 12% and 13% respectively.