The Melting Temperature of PP and Process Methods
Date:2022-5-18 Author:hcscrew
Polypropylene (PP) is a cost-effective polymer with a unique set of physical, chemical, mechanical, thermal, and electrical qualities not found in any other thermoplastic.
PP Density 0.90-0.91 g/cm3
PP Melting Temperature 165 °C
Glass transition temperature -10 °C
Max/Min continuous Service temperature 100-110 °C/-20 To -10 ℃
PP Processing Temperature 190-300 °C
Polypropylene is available either as homopolymers or block co-polymers.
Homopolymers are high strength and stiff but become brittle at low temperatures.
Block co-polymers have ethylene blended-in to improve the low temperature performance but they have less clarity and gloss. The higher the ethylene content the softer and tougher the material becomes.
Random copolymers with lower ethylene content and a slightly different structure exhibit lower melting point, greater flexibility or enhanced clarity(transparency).
The properties of polypropylene can be altered by the addition of fillers like talc or glass fibres. Although talc increases stiffness, it also reduces impact strength and heat resistance with time. Glass fibres provide good rigidity, improved impact resistance, good resistance to creep and better environmental stress cracking resistance.
Strength
Low cost, processable in any way. Excellent aesthetic qualities, simple to manufacture. Low friction coefficient, stiffness, small weight, and strong tensile and flexural impact strength. Electrical insulation is excellent, and fatigue resistance is excellent. Excellent moisture resistance, Excellent strength. Autoclavable, extremely excellent chemical resistance, little moisture absorption. It is well suited to integrated hinges used for flip flop closures and compass boxes due to its natural flexibility.
Limitations
High thermal expansion, UV degradation, low weathering resistance, assault by chlorinated solvents and aromatics, difficult to bind or paint, easily oxidises, combustible.
Applications
From crates and bins to housewares, washing machine drums, and plumbing fittings, to automotive applications such as bumpers and dashboards, chemical and plating tanks, orthotics and prosthetics, PP film, containers, appliances, packaging, electrical/electronic, furniture, paint pails, industrial items, medical devices, and others.
In conclusion, understanding the melting point of PP plastic can help us to design and optimize the extruder screw and barrel structure, as well as help extruder users reasonably choose a quality barrel screw.
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Contact HUACHEN Screw Barrel for more information about the melting points of PP plastics processed with extruder screws and to get a quote.
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