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 The general constitution of PP compounds for automotive applications. The impact strength of the - impact PP, which is composed of homo PP and ethylene propylene copolymer (EP copolymer), is improved by adding an ethylene - based elastomer such as ethylene-butene or ethylene-octene copolymer, to which inorganic filler such as talcum is added for enhanced rigidity. With respect to resin-based automotive parts, lower weight is demanded for the sake of  reduced environmental burden and better design and higher moldability are also required. In response to that demand, various phases of PP compounds for automotive applications have been improved.The improvements made thus far include greater rigidity, impact strength, fluidity and crystallization. Such enhancements of PP compounds have been achieved by compounding PP with additives such as elastomers and/or various inorganic fillers, as well as through higher stereoregularity, fluidity and rubberization which have been achieved with the aforementioned improvements in catalysts and the manufacturing process. The growth of PP compounds for automotive applications has thus far been supported by the improved performance of PP resins which serve as the base of PP compounds and advancements in compound technology. With respect to the former, catalysts and the polymerization process have been continually, energetically improved in order to control the primary and higher order structures of polymers. Regarding the latter, improvements in the performance and dispersibility of elastomers, as well as the control of particle size, dispersion and interface of  inorganic fillers, have been attempted up to the present time. With respect to resin-based automotive parts, lower weight is demanded for the sake of reduced environmental burden and better design and higher  moldability are also required. Also with the use of the filler materials the strength of the material made of polypropylene fibre has been improved. Also the property of polypropylene compound of fire resistant as the ignition temperature of the PP is very high. And the flexural strength is excellent, hence it is best replacement for metals and plastic for the car parts.