Sep 16 2001
Polyamideimide (PAI) materials are amorphous, high performance, strongly colored polymers with linear predominantly aromatic molecules of high thermal stability. They are usually melt-processed, but are infusible in their fully finished form after post-curing.
If semi-fabricated items are machined, additional post-curing is recommended to achieve maximum properties.
PAI have good wear and radiation resistance, very good high temperature properties (approaching those of polyimides), inherently low flammability and smoke emission.
They have the highest strength of any unreinforced thermoplastic, but are extremely expensive and attacked by alkalis.
Polymer Type
Thermoplastic
Advantages
Properties approaching those of Polyimide, yet melt processable. Highest strength of any unreinforced thermoplastic. Good wear resistance. Low smoke emission. Good radiation resistance.
Disadvantages
Polyamideimide is expensive and can be attacked by alkalies.
Applications
Applications of PAI include valves, bearings, electrical connectors, gears and general mechanical components.
Parts for jet engines, internal combustion engines, printed circuit boards and thrust washers.
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Internal combustion engines often use Polyamideimide (PAI) materials. Image Credit: ShutterStock/Sergey Kohl
Typical Properties
| Property |
Value |
| Density (g/cm3) |
1.40 |
| Surface Hardness |
RM109 |
| Tensile Strength (MPa) |
185 |
| Flexural Modulus (GPa) |
4.58 |
| Notched Izod (kJ/m) |
0.13 |
| Linear Expansion (/°C x 10-5) |
3.6 |
| Elongation at Break (%) |
12 |
| Strain at Yield (%) |
8 |
| Max. Operating Temp. (°C) |
210 |
| Water Absorption (%) |
0.28 |
| Oxygen Index (%) |
43 |
| Flammability UL94 |
V0 |
| Volume Resistivity (log ohm.cm) |
17 |
| Dielectric Strength (MV/m) |
23 |
| Dissipation Factor 1 kHz |
0.001 |
| Dielectric Constant 1 kHz |
3.5 |
| HDT @ 0.45 MPa (°C) |
260+ |
| HDT @ 1.80 MPa (°C) |
274 |
| Material. Drying hrs @ (°C) |
16 @ 150 |
| Melting Temp. Range (°C) |
315 - 360 |
| Mould Shrinkage (%) |
0.7 |
| Mould Temp. Range (°C) |
180 - 260 |
Source : Abstracted from Plascams
For more information on Plascams please visit RAPRA Technology Ltd.