Page 275 - Engineering Plastics Handbook

Thermoplastic Polyimide (TPI) 237

200
Tensile strength, MPa 150

100

50

0
0 50 100 150 200 250 300 350
(122) (212) (302) (392) (482) (572) (662)
Temperature, °C (°F)
Figure 10.9 SuperAurum ™ XPL, tensile strength versus
temperature.

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injection molding. SuperAurum has better chemical and mechanical
properties as well.

High-temperature properties
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Figure 10.9 shows the features of SuperAurum . Aurum is an amor-
phous polymer after injection molding. Therefore, the designs for more
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dimensionally precise parts require Aurum , along with superior wear
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and friction up to 455°F (235°C). SuperAurum, however, is in a different
category since it is crystallized during injection molding. It has outstand-
ing mechanical, wear and friction, and chemical properties up to elevated
temperatures beyond 455°F (235°C). It is much easier to understand the
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differences between other engineering superplastics and SuperAurum by
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examining the modulus versus temperature curve. Aurum can keep a high
modulus at up to 235°C, but the modulus decreases beyond 235°C since
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the T is 250°C and it is amorphous. Since SuperAurum has T of 374°F
g
g
(190°C) but is a crystalline polymer, it can maintain high rigidity even at
wide-ranging temperatures of 482 to 626°F (250 to 330°C).
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SuperAurum grades
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The following SuperAurum grades are commercially available. See
Table 10.10 for a list of properties.
1. Natural grade: powder, XPD; pellets, XPL
2. Carbon fiber reinforced: XCN3030
3. Glass fiber reinforced: XGN3030
4. Wear and friction grade: XCL3030