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> Polyamide imide (PAI).
Used
for aerospace applications, it is initially moulded as a thermoplastic
and then postcured to produce partial thermosetting properties
including improved temperature resistance. Hot/wet in service
temperature ~ 190°C. These resins have a good resistance
to UV, gamma radiation and wear and have low smoke emissions
during combustion. However they are expensive and difficult
to injection mould, in addition to this they absorb moisture
and are susceptible to attack by alkalis, oxidising agents
and formic acid.
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