In order to produce a rubber sealing material with satisfactory physical and mechanical properties

heat resistance

and flame retardance

a nano MH/AF/NBR composite material was made by using nitrile butadiene rubber (NBR)

aramid fiber (AF)

and nano magnesium hydroxide (MH). Physical and mechanical performance

heat resistance

and flame retardance of the composite material were investigated for different proportions of nano MH and AF. Nano MH reinforced the internal structure of the composite material. The bond strength between AF and rubber matrix decreased with increasing amount of AF in the composite. When MH/AF ratio was 20/10

the stress at definite elongation and tensile strength were increased by 4%

and compression set was reduced by 1%. When MH/AF ratio was 30/10

hardness increased to 73 degree. The nano MH/AF composite had good flame retardance and improved thermal stability of NBR. Additionally

the total smoke production of the composite material was reduced. The results established a foundation for further applications using the nano MH/AF/NBR composite material as a sealant.