Comparison of engineering plastics PEI, PSU and PPSU

Comparison of engineering plastics PEI, PSU and PPSU

These three materials, PEI PSU PPSU, are non-reinforced amorphous bodies, which have many characteristics of common engineering plastics, and at the same time have excellent comprehensive properties, such as mechanical, thermal and electrical properties.

PEI PSU PPSU Main features:
1. The allowable working temperature in the air is higher (for PPSU, PEI, PSU continuous working temperature is 180°C, 170°C and 150°C respectively);
2. Good mechanical strength and high rigidity in a wide temperature range;
3. Excellent hydrolysis resistance (suitable for repetitive steam);
4. Physical inertness (suitable for contact with food);
5. Very good dimensional stability;
6. Translucent, opaque (except PPSU is black);
7. Anti-UV;
8. Resistance to high-energy radiation (Y-rays and X-rays);
9. Good electrical insulation performance application field.

PEI PSU PPSU Application:
Aiming arm and spotting mirror:
In the process of correcting femoral fractures, the assembled PEI aiming arm and positioning mirror are used in conjunction with positioning screws. By using PEI components, the positioning can be checked through the screen, (instead of exposing hands to X-rays, when After the beam locks the position, the mirror is removed and a hole is drilled to repair the bone with titanium screws)

Clip, the high insulation and inherent low flammability of PEI, is an ideal material for aircraft, tank and ship video type, circuit board clips.

Cleaning Equipment Liners
Liners made of PSU make nylon distribution components chemically resistant to hot water and chemical cleaning equipment.

Endoscope Probe Positioning Clamp
Due to its excellent high pressure properties, PPSU was chosen as the positioning collar material on the instrument handles of endoscopic surgical devices.

Important note: PSU PEI and PPSU are amorphous thermoplastics that are very sensitive to stress cracking when in contact with polar organic solvents such as ethanol. The working environment is completely harmless to non-stressed parts, but it will cause stress embrittlement to parts with high stress. Not only the external load will generate stress, but also the internal stress generated during the machining process and the profile production process will have a great effect on the phenomenon of stress embrittlement. The stress relief of machining with some form of heat treatment will therefore reduce the risk of stress embrittlement to zero. Oil-based coolants should not be used on these amorphous thermoplastics as they appear to increase environmental stress cracking. For these materials, good coolants are pure water or compressed air.
In view of the poor wear resistance and high friction coefficient of PPSU, PEI and PSU, it is not recommended to be used in occasions requiring friction or wear resistance