Neat CF PEI examples of tensile strength retention versus temperature C

For long-term heat ageing, property retention depends on the property and grades considered, notably the heat stabilizers used. Impact strength and elongation at break are especially heat-sensitive characteristics. 

The behaviour at low temperatures is good, depending on the grades and the mechanical constraints experienced. 

Generally, polyetherimide displays notch sensitivity and stress concentrators must be avoided when designing. Notched Izod impact strengths slowly decrease between room temperature and -30°C retaining, for example, 80-100% of the original value. 

These results relate to some grades only and cannot be generalized. 

Amorphous polyetherimides are transparent to visible and infrared light with a slight amber colour and refractive indices of about 1.63-1.69. 

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Figure 4.109. Neat CF PEI examples of tensile strength retention (%) versus temperature (°C)...

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