Injection molding plastic

Physical and mechanical properties of injection molded plastic

Injection molding plastic

Physical and mechanical properties of injection molded plastic

We use plastic almost every day, and many people use plastic to design products, but few of them have a thorough understanding of the characteristics of the plastic they use, what they intend to do with it, or how they are measured.

Commonly used injection molding plastics are tough and elastic materials with excellent creep resistance, geometric stability, and impact resistance even at low temperatures.

Homopolymer materials have good tensile strength and fatigue strength but are not easy to process. Copolymer materials have good thermal stability, chemical stability and are easy to process. Both homopolymer materials and copolymer materials are crystalline materials and do not easily absorb water.

Aria takes the time to describe and test some of the same properties (both physical and mechanical) of plastics so that you won’t be confused when designing or reading a list of plastic properties provided by a supplier.

Document
Materials Feature Testing Conditions Authority file
Melt Flow Index g/10min ASTM D1238
Tensile Strength 5mm/min ASTM D638
Elongation at Break 5mm/min ASTM D638
Flexural Strength 2.8mm/min ASTM D790
Flexural Modulus 2.8mm/min ASTM D790
Impact Strength of notched specimens 1/4" or 1/8" ASTM D256
Rockwell Hardness R-scale ASTM D785
Heat deflection temperature 15.56kgf/cm ASTM D645
Vicat Softening temperature 5Kg ASTMD1525
Document
Materials Feature Testing Conditions Authority file
Melt Flow Index g/10min ASTM D1238
Tensile Strength 5mm/min ASTM D638
Elongation at Break 5mm/min ASTM D638
Flexural Strength 2.8mm/min ASTM D790
Flexural Modulus 2.8mm/min ASTM D790
Impact Strength of notched specimens 1/4" or 1/8" ASTM D256
Rockwell Hardness R-scale ASTM D785
Heat deflection temperature 15.56kgf/cm ASTM D645
Vicat Softening temperature 5Kg ASTMD1525