Effect of short fiber filler on the properties of NBR-matrix insulator

A new type of NBR-matrix insulator filled with non-asbestos fiber filler was developed. By comparing several synthetic fibers such as polyacrylonitrile pre-oxidation fiber,viscose staple fiber, Metamax fiber and so on, phenolic fiber was selected as the short fiber filler. Effect of the amount of phenolic fiber on the ablation-resistant and physical properties of NBR was investigated and the heat affecting mechanism was analyzed. The result show that the properties of the material will be well balanced when phenolic fiber/NBR weight radio of 25/100 is used. Linear ablation rate, tensile strength, elongation-to-break, and density of the material is 0.04mm/s, 8.12MPa, 794%and 1.114g/cm~3respectively.