Typic plastic materials properties and application:

Polyethylene (PE)
Glass transition temperature: -78oC.
Melting temperature: 100oC.
Amorphous density at 25oC: 0.855 g/cm3.
Crystalline density at 25oC: 1.00 g/cm3.
Molecular weight of repeat unit: 28.05 g/mol.
Typical physical properties
Polyethylene is an inexpensive and versatile polymer with numerous applications. Control of the molecular structure leads to low density (LDPE), linear low density (LLDPE) and high density (HDPE) products with corresponding differences in the balance of properties.

Polypropylene (PP)
Glass transition temperature: -10oC.
Melting temperature: 173oC.
Amorphous density at 25oC: 0.85 g/cm3.
Crystalline density at 25oC: 0.95 g/cm3.
Molecular weight of repeat unit: 42.08 g/mol.
PROPERTIES
(Semi-rigid, translucent, good chemical resistance, tough, good fatigue resistance, integral hinge property, good heat resistance).
PP does not present stress-cracking problems and offers excellent electrical and chemical resistance at higher temperatures. While the properties of PP are similar to those of Polyethylene, there are specific differences. These include a lower density, higher softening point
APPLICATIONS
Polypropylene can be processed by virtually all thermoplastic-processing methods. Most typically PP Products are manufactured by: Extrusion Blow Moulding, Injection Moulding, and General Purpose Extrusion. Expanded Polypropylene (EPP) may be moulded in a specialist process.

Acrylonitrile-butadiene-styrene (ABS)
Acrylonitrile-butadiene-styrene (ABS) resins consist of a styrene-acrylonitrile copolymer matrix and a styrene-butadiene copolymer dispersed rubber phase. These are engineering plastics, with better solvent and high temperature resistance than impact polystyrenes. Optimum properties require grafting between the matrix and dispersed phases.

Polycarbonate (PC)
Glass transition temperature: 145oC.
Melting temperature: 225oC.
Amorphous density at 25oC: 1.20 g/cm3.
Molecular weight of repeat unit: 254.3 g/mol.
Polycarbonate (PC) is a clear, colorless polymer used extensively for engineering and optical applications. It is available commercially in both pellet and sheet form. Outstanding properties include impact strength and scratch resistance. The most serious deficiencies are poor weatherability and chemical resistance.

Polyvinyl Chloride (PVC)
Glass transition temperature: 85oC.
Melting temperature: 240oC.
Amorphous density at 25oC: 1.385 g/cm3.
Crystalline density at 25oC: 1.52 g/cm3.
Molecular weight of repeat unit: 62.50 g/mol.
Poly(vinyl chloride) (PVC) is one of the most widely used polymers in the world. This polymer is usually plasticized with low or medium molecular weight materials such as dioctyl phthalate, trioctyl phosphate, and poly(propylene glycol) esters. The properties can be finely tuned from rigid to soft and flexible by varying the plasticizer content from a few percent to more than 60%. The largest use is for rigid pipe; other uses include window frames, flooring, cable insulation, and other household and construction applications.

Polystyrene (PS)
Glass transition temperature: 100oC.
Amorphous density at 25oC: 1.05 g/cm3.
Molecular weight of repeat unit: 104.1 g/mol.
Polystyrene (PS) is a clear, colorless polymer used extensively for low-cost applications. It is available commercially in both pellet and sheet form. The most serious deficiencies are low impact strength, poor weatherability and poor chemical resistance. Numerous modified grades which seek to correct these shortcomings are commercially available.