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Based on temperature withstanding ability, classify insulating material. 

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Temperature withstanding ability in 0C Materials
Y
90
Cotton, silk paper and similar organic materials neither impregnated nor immersed in any oil, rubber, PVC.
A
105
Impregnated paper, silk, cotton, polyamides resins
C
120
Enameled wire insulations on base of polyvinyl formal, polyurethane and epoxy resins, molding etc.
B
130
Inorganic materials ( mica, fibre, glass, asbestos) impregnated with varnish and other compounds 
F
155
Mica, polyester, epoxide varnishes with a high heat resistance
H
180
Composite materials on mica, fiber, glass and asbestos bases, impregnated with silicon rubber except other rubber compounds
C
Above 180 
Mica, ceramics, glass, Teflon, quartz, etc. 

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