Polypropylenes are chemically similar to polyethylenes but have somewhat better physical strength. The density of polypropylene is among the lowest of all plastic materials, ranging from 0.900 to 0.915. Polypropylenes are perhaps the only thermoplastic that surpasses all others in combined electrical properties, heat resistance, rigidity, toughness, chemical resistance, dimensional stability, and surface gloss at a lower cost compared to other thermoplastic materials.
Although polypropylenes are arranged spatially into ISOTACTIC, SYNDIOTACTIC AND ATACTIC, isotactic polypropylenes are the most common. Furthermore, PP materials are distinguished between homopolymer and copolymer whereby the former has only monomers of polypropylene connected during polymerisation, whereas other substances such as polyethylene are added to the copolymer (thus becoming a “block copolymer”) in order to provide the material with the required higher tenacity consequently, hardness, stiffness and yield stress are reduced. The result is a material that has mechanical properties situated between homopolymer and polyethylene but with a significant increase in its notched impact strength.
Polypropylenes are available in 3 colours, RAL7032 industrial Grey, Natural (food approved) and UV resistant Black.
Polypropylenes therefore can be characterised by the following properties:
• Low density
• High chemical resistance
• High corrosion resistance
• High surface hardness
• Negligible moisture absorption
• Very good electrical insulation properties
• Poor abrasion resistance
Fields of application: battery cells, acid tanks and linings, chemical pipes, orthoses and prostheses, medical parts and water de-ionisation equipment.
• Block Copolymer
• Flame Retardant
• Talc Filled
• Copper resistant
• Electrically Conductive