Plastic bottle caps are often made from PP. Dielectric strength depends on the temperature and the wall thickness of an item. Compared to low or high density polyethylene, it has a lower impact strength, but superior It can mostly be found in battery cases and trays, bumpers, fender liners, interior trim, instrumental panels and door trims. Material Properties of Plastics 1.1 Formation and Structure The basic structure of plastics (or polymers) is given by macromolecule chains, formulated from monomer units by chemical reactions. This combination of performance properties gives polypropylene a position in the injection molding field that is unique among thermoplastics. Typical reactions for chain assembling are polyaddition (continuous or step wise) and condensation polymer-ization (polycondensation) [1] (Figure 1.1).. Among these and many other great properties, polypropylene is easily fabricated. Automotive Applications: Polypropylene is widely used in automotive parts because of its low cost, weldability, and mechanical properties. Items such as disposable coffee cups, plastic food boxes, plastic cutlery and packing foam are made from PS. Polypropylene is an economical material that offers a combination of outstanding physical, chemical, mechanical, thermal and electrical properties not found in any other thermoplastic. Polypropylene is one of those most versatile polymers available with applications, both as a plastic and as a fibre, in virtually all of the plastics end-use markets PP, like polyethylene (see HDPE, L/LLDPE) and polybutene (PB), Polypropylene is a polyolefin or saturated polymer. It offers a great combination of properties such as lightweight, strong, high heat resistance, as well as stiffness and flexural retention. Polypropylene is a good insulator with very low dielectric constant and low dissipation factor. Polypropylene (PP) is a linear hydrocarbon polymer, expressed as CnH2n. Polypropylene is highly responsive to injection speed and pressure and sets up quickly in the mold, enabling molders to attain high production rates. heat tolerance (°C) 82-93 132-149 66-93 90-140 Min. Figures - … Polypropylene has very good mechanical properties which result from regular structure and molecular weight distribution. Numerous industrial end uses exist as well, including rope and cordage, disposable nonwoven fabrics for diapers and medical applications, and nonwoven fabrics for ground stabilization and reinforcement in construction and road paving. Properties Polyethylene Polypropylene Polyvinyl chloride Cellophane Max. Polystyrene is commonly recycled, but is difficult to do. 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