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This study is on the scratch resistance of polypropylene resins and polypropylene compound materials being widely used for automotive interior applications. The study describes the scratch phenomenon of plastic materials and demonstrates the contribution of each major component in PP compounds to the scratch characteristics of the plastic materials.

These days, many new applications for long-fiber-reinforced thermoplastic Polypropylene (PP-LFT) have been coming in the worldwide automobile market. Main issue of this paper is to explain how PP-LFT door module plate was developed, which processes were executed, and what kind of advantages we can get, once it is used as door module plate. Some of steel parts in the car have been changed to the reinforced PP-LFT with weight-saving. Change of material can make modularity more efficient, and then improvement of manufacturing process results in cost-saving. Stress analyses and MoldFlow analyses have been performed to choose the optimized conditions and a product model. Then various tests including waterproof test, drop-weight test and stiffness test have been executed to check if the weight-reduction is suitable for mass-production.