Polypropylene modified by the addition of reinforcements such as talc, chalk, mica and glass fibre has enabled it to establish itself as a metal substitute in engineering applications. Further sophistication involving development of coupling systems, impact modifiers and technology for improved surface finish has more recently led to rapid growth of second generation grades in areas traditionally dominated by other engineering plastics such as ABS, Polyamide, modified PPO, Polyester, Acetal and Polycarbonate.