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Polyimide
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==Properties== Thermosetting polyimides are known for thermal stability, good chemical resistance, excellent mechanical properties, and characteristic orange/yellow color. Polyimides compounded with [[Carbon (fiber)|graphite]] or [[glass fiber]] reinforcements have [[flexural strength]]s of up to {{convert|340|MPa|psi|abbr=on}} and [[flexural modulus|flexural moduli]] of {{convert|21000|MPa|psi|abbr=on}}. [[Thermoset polymer matrix]] polyimides exhibit very low [[Creep (deformation)|creep]] and high [[tensile strength]]. These properties are maintained during continuous use to temperatures of up to {{convert|232|C|F}} and for short excursions, as high as {{convert|704|C|F}}.<ref>{{usurped|1=[https://web.archive.org/web/20200320223857/http://proofresearchacd.com/wp-content/uploads/2015/10/PROOF-ACD_data_sheet_900HT_update_10-16-15v2.pdf P2SI 900HT Tech Sheet]}}. proofresearchacd.com</ref> Molded polyimide parts and laminates have very good heat resistance. Normal [[operating temperature]]s for such parts and laminates range from cryogenic to those exceeding {{convert|260|C|F}}. Polyimides are also inherently resistant to flame combustion and do not usually need to be mixed with [[flame retardant]]s. Most carry a [[certification listing|UL rating]] of VTM-0. Polyimide laminates have a flexural strength half life at {{convert|249|C|F}} of 400 hours. Typical polyimide parts are not affected by commonly used solvents and oils β including hydrocarbons, esters, ethers, alcohols and [[freon]]s. They also resist weak acids but are not recommended for use in environments that contain alkalis or inorganic acids. Some polyimides, such as CP1 and CORIN XLS, are solvent-soluble and exhibit high optical clarity. The solubility properties lend them towards spray and low temperature cure applications.
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