Homopolymers or copolymers made from formaldehyde.
Typical Characteristics and Applications
• High levels of hardness and rigidity
• Good elastic properties
• Low creep tendency
• Good friction and wear properties (slightly lower wear resistance than PA 6.6, but lower friction coefficient)
• Cold resistant down to –50 °C, upper operating temperature 100 °C, 150 °C for brief periods
• Low moisture absorption
• Favourable dielectric behaviour
• Resistant to petrol, oil and numerous solvents, weak acids; copolymers also resistant to alkali solutions
• Practically no tendency to stress crack formation in air
• Natural colour strongly whitish-opaque
• Applications: precision components, parts subjected to friction stress and wear stress (bearings, gears, etc), similar to PA, however with better dimensional stability. All kinds of parts with high permanent load, frequently replacing metals. Components with flexible parts, especially for tear off closures.
Typical processing data is given in Table 6.19.
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