Thermosetting plastics include phenol-formaldehyde resins known as bakelite. Phenol-formaldehyde polymers are rigid and heat stable up to 150 degrees Celsius, with low thermal conductivity and good electrical insulation. They are used in electrical components like plugs, sockets, and switches. Amino-formaldehyde resins include urea-formaldehyde and melamine-formaldehyde, which are also hard and rigid with electrical insulation properties. Urea-formaldehyde and melamine-formaldehyde resins find applications in electrical devices and circuit breakers. Other thermosetting plastics such as polyesters, vinylesters, epoxies, and polyurethanes are used in applications like safety helmets

1. THERMO SETTING
PLASTICS

2. PHENOLICS
• It is also known as bakelite
• Pheonolic materials is the POLYFORALDEHYDE
POLYFORALDEHYDE:
It is consists of phenol and formaldehydes.
CHARACTERISTICS:
1. Hard and rigid thermoset stable up to 150 c
2. Low thermal conductivity and good electrical
insulation
3. Low in cost

3. APPLICATIONS
• Electrical plugs
• Sockets
• Switches
• Telephones

5. AMINO FORMALDEHYDE
• High polymers contains amino group with
aldehydes
– Urea formaldehyde
– Melamine formaldehyde

6. Urea formaldehyde
• Urea monomers with formaldehyde
CHARACTERISTICS:
1. Similar to pheonolics
2. Hard and rigid
3. Electrical insulation properties
4. Good resistance to most chemical
APPLICATIONS:
Electrical devices, circuit breakers, switches.

7. MELAMINE FORMALDEHYDES
• Melamine monomers with formaldehyde
CHARACTERISTICS:
1. Similar to the urea formaldehyde
• APPLICATIONS:
– Same as the urea formaldehydes.

8. Other thermoset plastics
• POLYESTERS( safety helmets, machine
covers)
• VINYLESTERS
• EPOXIDES (Sports goods, electrical circuits)
• POLYURATHENES (Car bumpers, hammer
heads)