Introduction to Thermosetting Plastics
Aminos
[1] Urea formaldehyde resins:
Urea formaldehyde resins are copied from the reaction of urea with formal - dehyde or the polymers of it. These resins cannot present high resistance to heat.
[2] Melamine:
While the resin is employed with asbestos or glass fibre as filler material, the heat resistance of it is in the range of 2000 C. It is extremely resistant to chemicals. Possess outstanding electric arc resistance. Excellent resistance to water. Presented in full range of opaque colours or translucent. Boards are prepared from these material are employed like distributor heads, casings for electric devices, terminal boards.
Phenolics [Phenol formaldehyde resin]:
They are prepared through a reaction among the phenol and formaldehyde. They are possibly the most extensively employed and most cheap of thermosetting plastics. Rigid, Strong, and dimensionally stable.
Heat and solvent resistant. Non-conductors of electricity. Employed like a Electrical appliance handles, TV and Radio cabinets.
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