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Plastics Commonly Used for Injection Molding

Reported 26 Aug 2024 17:31:13
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26 Aug 2024 17:31:13 Eric Hoy posted:
The choice of plastic for injection molding depends on various factors, including the desired properties of the final product, cost, and processing conditions. Here are some of the most common plastics used in injection molding:

Thermoplastics:
ABS (Acrylonitrile Butadiene Styrene): A versatile plastic known for its impact resistance, stiffness, and good dimensional stability.
PP (Polypropylene): A lightweight, durable plastic with excellent chemical resistance and heat resistance.
PE (Polyethylene): A flexible and tough plastic available in high-density (HDPE) and low-density (LDPE) forms.
PVC (Polyvinyl Chloride): A rigid plastic with good chemical resistance and flame retardancy.
PC (Polycarbonate): A strong, transparent plastic with high impact resistance and heat resistance.
Nylon: A tough, durable plastic with good abrasion resistance and chemical resistance.
PET (Polyethylene Terephthalate): A clear, strong plastic with good barrier properties, often used for beverage bottles.
Thermosetting Plastics:
Epoxy: A rigid, high-strength plastic with excellent chemical resistance and good electrical properties.
Phenolic: A durable, heat-resistant plastic with good flame retardancy and electrical insulation properties.
Polyester: A versatile plastic with good mechanical properties and chemical resistance.
Factors to consider when selecting a plastic:

Mechanical properties: Strength, stiffness, toughness, and flexibility.
Chemical resistance: Resistance to acids, bases, solvents, and other chemicals.
Heat resistance: Ability to withstand high temperatures without deformation or degradation.
Flame resistance: Ability to resist ignition and spread of flames.
Electrical properties: Insulation resistance, dielectric strength, and conductivity.
Optical properties: Transparency, color, and gloss.
Cost: The cost of the plastic material and the processing costs.

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