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Polypropylene (PP) is a thermoplastic polymer produced via chain-growth polymerization from the monomer propylene. Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar. Its properties are similar to polyethylene, but it is slightly harder and more heat resistant. Polypropylene is the second-most widely produced commodity plastic and is one of the top-three most-used polymers today. Homopolymers and copolymers are the two main types of polypropylene available in the market. Polypropylene is one of those most versatile polymers available with applications, both as a plastic and as fibre, in virtually all of the plastics end-use markets.
Automotive Applications, Household Goods, Electrical/Electronic Applications, Appliances, Industrial Applications, Containers, Packaging – Flexible & Rigid, Automotive Interior Parts, Film, General Purpose, Fibre & Fabrics, Medical Application
PolyPropylene homopolymer has a high strength-to-weight ratio and is stiffer and stronger than the copolymer. These properties combined with good chemical resistance and weldability make it a material of choice in many corrosion resistant structures.
Polypropylene copolymer is a bit softer but has better impact strength. It’s tougher and more durable than a propylene homopolymer. It tends to have better stress crack resistance and lower temperature toughness than a homopolymer at the expense of a small reduction in other properties. PP Copolymer is further divided into Block Copolymer and Random Copolymer.
Polypropylene Block Copolymer (PP Block) is also known as Impact Copolymer. Impact copolymer PP resins are derived through copolymerization with ethylene, but with this grade, the ethylene content is much higher. This results in a much tougher material with excellent impact strength even at low temperatures. For this reason, impact copolymer PP resins are particularly suitable for freezer and microwave applications.
Polypropylene Random Copolymer (PP Random) is created by modifying the polymer chain through the addition of random chains of ethylene among the PP units. Due to the presence of ethylene, the rigidity characteristic of homopolymer resins is somewhat sacrificed. However, this results in improved impact strength and a softer feel. Random Copolymer PP resins also exhibit good chemical resistance against most inorganic acids, alkalis and salts. Clarified grades of random copolymer are available from Impact Plastics.