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PP Sheets

Polypropylene

Polypropylene (PP) is a semi-rigid, translucent polymer with good toughness and weather resistance properties. It is a largely non-polar, partially crystalline thermoplastic with 60 to 70% crystallinity. PP has a density of 0.90 to 0.92 g/cm3, amongst the lowest densities for all plastics. PP Sheets are made in 3 primary grades for application-based usage- in PPHomopolymer (PPH), PP-Copolymer (PP-C), and PP Random Copolymer (PP-R). PP has replaced many traditional construction materials in various applications, including metals, wood, and concrete.

Chemical and physical properties: Most commercial polypropylene is isotactic and has an intermediate level of crystallinity between that of low density polyethylene ( LDPE ) and high density polyethylene ( HDPE ); its Young's modulus is also intermediate. PP is normally tough and flexible, especially when copolymerised with ethylene. This allows polypropylene to be used as an engineering plastic, competing with materials such as ABS. Polypropylene is reasonably economical, and can be made translucent when uncolored but is not as readily made transparent as polystyrene, acrylic or certain other plastics. It is often opaque and/or coloured using pigments. Polypropylene has good resistance to fatigue.

There are three general types of PP: homopolymer , random copolymer and block copolymer . The comonomer used is typically ethylene. Ethylene-propylene rubber or EPDM added to PP homopolymer increases its low temperature impact strength. Randomly polymerized ethylene monomer added to PP homopolymer decreases the polymer crystallinity and makes the polymer more transparent.

Homopolymer:

Homopolymer is a high corrosion resistant polypropylene material which exhibits excellent tensile strength and stiffness at elevated temperatures. These polypropylene possess excellent resistance to organic solvents and degreasing agents as well as electrolytic attack..

Compared to low or high density polyethylene, homopolymer has a lower impact strength, but superior working temperature and tensile strength. In addition, polypropylene is light weight, stain resistant and has a low moisture absorption rate.

Copolymer:

Is one of the various type of impact copolymers , a rapidly growing segment of the thermoplastic sheet market. The properties can be tailored to meet a wide range of specific end-use application characteristics. Copolymers is formulated to provide high levels of impact resistance as well corrosion resistance against a broad group of reagents, including Organic solvents , degreasing agents and electrolytic solutions. Copolymers is a mid density polypropylene, which retains its high tensile strength at elevated temperatures.

Manufacturing:

The large number of end use applications for PP are often possible because of the ability to tailor grades with specific molecular properties and additives during its manufacture. For example, antistatic additives can be added to help PP surfaces resist dust and dirt. Many physical finishing techniques can also be used on PP, such as machining. Surface treatments can be applied to PP parts in order to promote adhesion of printing ink and paints.

Application:

Metal plating Barrels, Tank Covers, Plating Modules, Machined parts, Scrub Station, Scrubbers, Fume Hoods and Ducts, Artificial Limbs, Orthopaedic Appliances, Battery cases, Cutting Boards, Radio and television equipments. Acid tank lining, laboratory sinks, etching machine, etching rinse tubs.

Technical Information: