Polyimide fiber, tseem hu ua P84 fiber, yog cov khoom siv hluav taws xob kub-resistant nrog kub kub ua haujlwm.Ntawm 300 ℃ rau 100 h, lub zog tuav tus nqi yog 50%, qhov elongation yog txo los ntawm 5% ~ 10%, thiab qhov raug tus nqi yog 250 H, lub zog tuav tus nqi ntawm 45%, zoo heev seem stability ntawm 275 ℃, tsis melting , iav kub ntawm 315 ℃, tsuas yog tso cov pa phem me ntsis thaum decomposition.Nws tuaj yeem khiav tsis tu ncua ntawm 260 ℃ thiab qhov kub ua haujlwm tam sim no tuaj yeem ncav cuag 280 ℃.