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State the insulating materials used in motor. Write temperature class and withstand temperature ranges for them. 
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The insulating materials used in motor are as belows:


1. Cotton,

2. Silk, or paper,

3. Press board,

4. Resins

5. PVC

6. Cellulose-Fiber,

7. Enameled coating, etc 


Insulation Classes
Maximum permissible temperature (°C)
Materials 
Class-Y 
90°
cotton, silk, or paper, press board, vulcanized fiber, wood, celluloseFiber, PVC VIR etc without impregnating substance
Class- A 
105°
cotton, silk, or paper, press board, vulcanized fiber, wood, with impregnated varnish or insulation oil
Class- E 
120°
Superior wire enamels based on polyvinyl ferrul or epoxy resins, moudling with cellulose fibers, cotton fabric and paper laminates. 
Class- B 
130°
Glass fiber, asbestos, Mica, Varnished glass fiber textile, built up mica
Class- F
155°
adhesives, silicone, and alkyd-resin varnish of higher thermal endurance and: Glass fiber, asbestos, Mica, Varnished glass fiber textile, built up mica
Class- H
180°
Combination of materials such as mica, glass, fiber, asbestos, with suitable high resistive bonding material like silicon
Class- C
Over 180°
Mica, porcelain, ceramics, glass quartz, asbestos, treated glass fiber or treated asbestos. etc.
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