PP

Material Type

Plastic

Material Full Name

Polypropylene

Process Compatibility

Injection Molding, CNC Machining

PP Description

Price

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Strength

High chemical resistance, lightweight properties, low moisture absorption, excellent fatigue resistance, good electrical insulation.

Weakness

Susceptibility to UV degradation, poor resistance to high temperatures, tendency to warp under stress, and limited impact strength.

Common Application

PP is commonly used in packaging, automotive components, consumer products, textiles, and medical devices.

PP Properties

Polypropylene (PP) is valued for its diverse properties, including high chemical resistance, lightweight nature, and low moisture absorption. It boasts excellent fatigue resistance, making it ideal for repeated use.

Properties at a Glance

*Pease note: The following material properties are for reference only. Actual values may vary depending on the selected material brand.

Property	Metric	English
Density	0.9 g/cm³	0.033 lb/in³
Shore Hardness D	45-55	45-55
Min Temp. Air	-40-20°C	-40 - 68 °F
Max Temp. Air	80-130 °C	176 - 266 °F
UL94 Fire Rating	HB	HB
Elongation at Break	8-12%	8-12%

Chemical Properties

Resistant to many acids and alkalis.
Susceptible to degradation by strong oxidizing agents and aromatic hydrocarbons.
Generally resistant to organic solvents and oils.

How Additives Improve PP Properties

PP (polypropylene) material can be modified through the addition of various additives. These additives can include UV stabilizers, antioxidants, nucleating agents, fillers, and impact modifiers. They are typically mixed into the PP resin during the compounding process to improve specific properties such as UV resistance, thermal stability, impact strength, and stiffness.

When modifying PP with additives, it's crucial to consider the specific properties you want to enhance and any potential trade-offs. For instance, adding fillers like talc or glass fibers can increase stiffness and strength but may decrease impact resistance. Similarly, incorporating flame retardants to improve fire resistance might affect the material's mechanical properties or processing characteristics.

Knowledge Hub

A Comprehensive Guide For PP Injection Molding

What is PP Injection Molding Polypropylene PP Injection molding is a process in which a polypropylene material is heated to its melting point and then ...

2023-11-13

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FAQs of PP Materials

View our FAQ center for more questions.

Is PP recyclable?

Yes, PP material is recyclable. It can be melted down and reprocessed into new products, reducing waste and conserving resources.

Is PP safe?

Yes, PP (polypropylene) is generally considered safe. It is non-toxic, resistant to chemicals, and does not leach harmful substances into food or beverages, making it suitable for use in food packaging and medical devices. However, as with any material, proper handling and disposal practices should be followed to ensure safety.

What are the types of PP?

Polypropylene (PP) is commonly available in several types, including:

Homopolymer PP: Consists of only propylene monomer units and offers good stiffness, strength, and chemical resistance.
Copolymer PP: Contains a blend of propylene and ethylene monomer units, providing improved impact resistance and clarity compared to homopolymer PP.
Random Copolymer PP: Incorporates ethylene randomly along the polymer chain, enhancing flexibility and impact resistance while maintaining high chemical resistance.