Should PA injection molding choose new materials or recycled materials?

author: Universe plastic

2024-06-19

What is PA material

PA plastic material refers to polyamide, also known as nylon. It is a synthetic polymer material with a variety of excellent properties and is used in the manufacture of plastic parts in various fields.

During injection molding, new PA materials and recycled PA materials are often used. This article will introduce the differences between recycled plastic materials and new plastic materials in detail to help you choose in injection molding projects.

What types of PA materials are there?

1. PA6 (nylon 6): It has very good wear resistance, toughness and impact resistance, and is suitable for the manufacture of gears, bearings, automotive parts and electrical insulation parts.

2. PA66 (nylon 66): It has very high hardness and heat resistance, and is suitable for the manufacturing of industrial components, electronic appliances, mechanical parts, and sports equipment.

3. PA11 (nylon 11): It has excellent flexibility, chemical resistance and low temperature toughness, and is suitable for fuel pipes, air pipes, sports equipment, medical equipment, etc.

4. PA12 (nylon 12): It has good impact resistance, chemical resistance and low water absorption. It is used in pipe plastic parts, cable sheaths, automobile fuel systems, etc.

5. PA46 (nylon 46): It has high heat resistance and mechanical strength, and is mostly used for plastic parts in high temperature environments.

6. PA610 (nylon 610): Its performance is between PA6 and PA66, and its hygroscopicity is low. Used to make brushes, fibers, pipes, engineering plastics, etc.

7. PA612 (nylon 612): It has excellent wear resistance and low water absorption, and has similar performance to PA610.

8. PA1010 (nylon 1010): It has excellent toughness, chemical resistance and dimensional stability. It is used in oil pipes, air pipes, precision parts, medical equipment, etc.

9. Copolymerized nylon: Copolymerized by different nylon monomers, such as PA6 and PA66. Combining their respective advantages, the performance is more balanced.

PA material properties

density	1.13-1.15 g/cm³	water absorption	1.2-1.5%
Tensile Strength	60-80 MPa	Bending strength	90-110 MPa
Impact strength	80-100 kJ/m²	melting point	220°C
Heat distortion temperature	70-120°C	Dielectric constant	3.5-5.0
Dielectric strength	15-25 kV/mm	chemical resistance	Not resistant to strong acid and alkali

*The above data is for PA6

Application of PA materials

1. Automotive plastic parts: air intake pipe, fuel tank, radiator end cap, door handle, instrument panel, foot pedal.

2. Household electrical parts: connectors, wire harness sheaths, connecting plugs, hot and cold water pipes, gas pipes, and plastic parts for power tools.

3. Industrial parts: gears and bearing plastic parts, conveyor belts and chains, valve parts, bolts, nuts, drone parts.

4. Sports equipment: skis, ski boots, sports shoe soles and support structures.

5. Consumer products: such as brushes, combs, toothbrush handles, pot handles, and kitchen utensils.

Parameter comparison between new PA and regenerated PA

Property	New PA Material	Recycled PA Material
density	1.13-1.15 g/cm³	1.2-1.5g/cm³
water absorption	1.2-1.5%	1.3-1.8%
Tensile Strength	60-80 MPa	50-70 MPa
Bending strength	90-110 MPa	85-100 MPa
Impact strength	80-100 kJ/m²	65-85 kJ/m²
melting point	220°C	220°C
Heat distortion temperature	70-120°C	65-110°C
Dielectric constant	3.5-5.0	3.5-5.0
Dielectric strength	15-25 kV/mm	13-22 kV/mm
Wear resistance	excellent	Slightly worse

The main differences between PA new materials and recycled materials

1. Mechanical properties

New material: has high tensile strength, bending strength, heat resistance, wear resistance and chemical stability.

Recycled Materials: Although recycled materials are reprocessed, their mechanical properties, thermal and chemical resistance are often reduced.

2. Density quality

New materials: high purity, no impurities, low density and light weight.

Recycled material: The density increases slightly, depending on fillers or plasticizers added during the recycling process.

3. Cost-effectiveness

New materials: Processed from raw materials, the supply cost is high.

Recycled materials: Processed using recycled materials, low cost and environmentally friendly.

Conclusion

There are differences between new PA materials and recycled PA materials in terms of performance, quality, environmental impact and market demand. It is necessary to analyze the application requirements of the project before selecting a suitable material. Dongguan Universe Plastic Company has more than 15 years of plastic manufacturing experience and can provide You submit the most suitable material solution.

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