Polystyrene Hips/gpps

HDPE – high density polyethylene is defined by a density of greater or equal to 0.941 g/cm3. HDPE has a low degree of branching and thus stronger intermolecular forces and tensile strength. HDPE can be produced by chromium/silica catalysts, ziegler-natta catalysts or metallocene catalysts. The lack of branching is ensured by an appropriate choice of catalyst and reaction conditions. HDPE is used in products and packaging such as milk jugs, detergent bottles, margarine tubs, garbage containers and water pipes. High-density polyethylene (HDPE) or polyethylene high-density (PEHD) is a polyethylene thermoplastic made from petroleum. It takes 1.75 kilograms of petroleum (in terms of energy and raw materials) to make one kilogram of HDPE. HDPE is commonly recycled, and has the number “2” as its recycling symbol.

Polypropylene ( PP ) is thermoplastis copolymer used in a wide variety of different applications including packaging, textiles, plastic parts and reusable containers. It is defined by a density range of 0.946 g/cm3 for crystalline. PP is resistant to many chemical solvents, bases and acids. Polypropylene is most commercial isotactic and has an intermediate level of crystallinity between that of low-density polyethylene (LDPE) and high-density polyethylene (HDPE). Polypropylene is normally tough and flexible, especially when copolymerized 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 transucent when uncolored but is not as readily made transparent as polystyrene, acrylic, or certain other plastics.

Polyvinylchloride (PVC), is a theermoplastic polymer. It is a vinyl polymer constructed of repeating vinyl groups (ethenyls) having one of their hydrogens replaced with a chloride group. Polyvinylchloride (PVC) is the third most widely produced plastic after polyethylene and polypropylene. PVC is widely used in construction because it is cheap, durable, and easy to assemble. PVC production is expected to exceed 40 million tons by 2016. PVC intrinsic properties make it suitable for a wide variety of applications. It is biologically and chemically resistant, making it the plastic of choice for most household sewerage pipes and other pipe applications where corrosion would limit the use of metal.With the addition of impact modifiers and stabilizers, it becomes a popular material for window and door frames. By adding plasticizers, it can become flexible enough to be used in cabling applications as a wire insulator. It is also used to make vinyl records.

Linear low density polyethylene LLDPE is a substantially linear polymer polyethylene, with significant numbers of short branches, commonly made bycopolymerization of ethylene with longer-chain olefins. Linear low-density polyethylene differs structurally from conventional low-density polyethylene because of the absence of long chain branching. LLDPE has penetrated almost all traditional markets for polyethylene, it is used for plastic bags and sheets, plastic wrap, stretch wrap, pouches, toys, covers, lids, pipes, buckets and containers, covering of cables.