PPA Injection Molding
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PPA materials is a high-performance thermoplastic engineering plastic, and it costs more than ABS and Nylon.
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What is PPA Plastic?
PPA is a high – performance thermoplastic. It has excellent heat resistance, allowing it to maintain its mechanical properties at relatively high temperatures. For example, it can withstand continuous use temperatures that are much higher than many common plastics like polyethylene or polypropylene.
PPA also has good chemical resistance. It can resist a wide range of chemicals including oils, greases, and many solvents. This property is valuable in industrial and automotive settings where the parts may come into contact with various fluids.
It has high strength and stiffness. The mechanical properties of PPA enable it to be used in load – bearing applications. The tensile strength and modulus of elasticity of PPA are relatively high, which means it can resist deformation under stress.
Description
Full Name
Polyphthalamide
Process
Finishing options
Mold texturing，Pad printing，Laser engraving，Electroplating, Bead Blasting
Applications
Impact-resistant applications, Appliances, Housings, Toys
Prices
$
Features
Appearance
Red, White, Yellow, Orange Red, Black, Green, Blue, Purple
Strengths
Good Scratch Resistance, High Dimensional Stability, Ease of processing
Tensile Strength
6090 – 151000 PSI
Elongation at Break
0.500 – 150 %
Density
1.34 – 1.75 g/㎤
Advantages of PPA Injection Molding
There are many benefits derived from ABS plastic molding, Some of the advantages of the material include:
Exceptional Heat Resistance
PPA (Polyphthalamide) has a high heat distortion temperature, withstanding up to 250 – 300°C, far more than common thermoplastics like PP or ABS.
High Mechanical Strength
PPA has high tensile strength and stiffness. It can bear heavy loads and mechanical stresses, making it suitable for load bearing applications.
Superb Chemical Resistance
PPA injection molded products resist a wide range of chemicals, including oils, fuels, solvents, and many industrial ones.
High Dimensional Accuracy
PPA has good dimensional stability during and after the injection molding process. Once molded, the parts maintain their intended size and shape.
Long Term Durability
The combination of heat resistance, chemical resistance, and mechanical strength results in PPA molded parts having a long service life.
Applications of PPA Injection Molding
PPA (Polyphthalamide) injection – molded products have a wide range of applications due to their excellent properties:
PPA Injection Molding Material Properties
PPA Plastic Properties
Value
Tensile Strength (Yield) （MPa）
24.8 - 307
Flexural Modulus（GPa）
1.50 - 44.8
Impact Resistance (Izod Impact, Notched)
3.86 - 13.0 J/cm (7.23 - 24.4 ft-lb/in)
Maximum Service Temperature（℃）
130 - 255
Chemical Formula
H n+2 P n O 3n+1
Glass Transition Temperature（℃）
95.0 - 135
Heat Deflection Temperature（℃）
220
Drying Temperature（℃）
100-140
Drying Time（hr）
6-8
Mold Temperature（℃）
45～80
Melt Temperature（℃）
223～340
Injection Pressure（MPa）
41.4 - 124
Injection Speed（ mm/sec）
50-100
Cooling Time（S）
30～60
Scrap Quantity（mm）
2～8
Back Pressure（MPa）
8～15
Clamping Force（ton/in2）
4
Return Speed (rpm)
70～100
Shrinkage
1.5% to 2%
PPA Injection Molding Design Guide
Wall Thickness
Aim for consistent wall thicknesses of 1.5 to 4 mm. Thin sections can lead to warping and uneven cooling, while thick sections might cause material degradation due to prolonged exposure to high temperatures.
Draft Angles
Use a draft angle of at least 1-2° to facilitate easy part ejection from the mold.
Rib Design
Ribs should be designed with a thickness of 50-60% of the wall thickness to avoid excessive stress concentration and ensure even cooling.
Bosses Design
Bosses should have a uniform thickness and avoid sharp corners to reduce the risk of cracks and stress concentrations.
Parting Line
Ensure that the parting line is placed where cosmetic defects won’t affect the performance of the part.
Gate Location
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