Page 21 - Demo

Type of Plastic
Polyurethane
Polystyrene
Nylon
Code
TPUR PUR PUR PU PU PU PS
N/A
Advantages
Wide Range of Hardness high Load Bearing Capacity Abrasion & Impact Resistance
Light hard stiff transparent with good water resistance
outstanding mechanical and and electrical properties particularly toughness and wear resistance
Disadvantages
Some types of TPUR have a a short shelf life Not as as cost effective as as other alternatives Brittle low impact polystyrene breaks very easily not strong
High shrinkage in in moulded sections pollution problems lack of stability
Applications
Building insulation Refrigerators and freezers Furniture and bedding Footwear Automotive packaging applications and household appliances
From aircraft components to components for the electric utility industry 20
Figure 24 – Plastics [7]
Figure 23 – Common Injection Moulding Plastics [6]
Acrylonitrile Butadiene ABS Styrene
Uniform shrinkage in in both the flow and transverse-to-flow directions Minimal warpage strong
and flexible Not weather resistant and opacity (opaque)
office machines electronics and consumer related products Casings for kitchen equipment (e g food processors) toys telephones car components tool handles
Cheap Decent chemical resistance
Polypropylene PP and clarity Good electrical insulating properties Not great for UV exposure Moderate heat resistance
Protective caps for electrical contacts battery housings and small containers Polybutylene PBT sections due to its low melt Teraphthalate viscosity Excellent for molding thin cross
High mould shrinkage Poor resistance
to to hydrolysis Prone to to warping due to high differential shrinkage From under the hood automotive parts to to plastic housing in in in electrical industry