2. What is
thermosetting
plastic ?
2
Substances that cannot be reheated or remoulded
when they heated or transformed once. They are
difficult to recycle
Uses of thermosetting plastics
a) Rubbers
b) Balloons
c) Insulated electric wires
d) erasers
3. 3
Properties of thermosetting
plastics :
Durability:
thermosetting plastics are highly
resistant to heat, chemicals& impact
of force.
Flame Resistance:
Thermosetting plastics posses
inherent flame resistance properties,
which makes it suitable for fire-
retardant applications.
Insulation:
These plastics are excellent for
electrical insulators, which makes it
ideal for electronic appliances &
electric systems.
Dimensional Stability:
Due to the irreversible cross linking
process, thermosetting plastics
exhibit minimal shrinkage &
deformation, ensuring dimensional
stability.
4. Types of
thermosetting
plastics:
Epoxy resin:
It is a versatile thermosetting plastic widely used in adhesives &
composites.
Phenolic resin:
They are renowned for their excellent heat resistance, low
flammability which makes it a popular choice in automotive &
construction industry.
Melamine formaldehyde:
It offers a exceptional heat resistance makes it a suitable choice
for electrical switches, countertops & laminates
4
5. 5
HIGH STRENGTH
Thermosetting plastic possesimpressivestrength due to their network of
cross linked molecular bonds.
HEAT RESISTANCE
Thermosetting plastic can withstand high temperature without melting or
deforming,ensuring stability in various environment.
CHEMICAL RESISTANCE
Thermosetting plastic exhibit excellent resistance to corrosive chemicals,
making them suitable for harsh environment
DESIGN FLEXIBILITY
These materials can be moided into complexshapes, providing designerswith
greater freedom& flexibilityin their applications.
Advantages Of
Thermosetting
Plastics:
6. 6
IRREVERSIBLE
Once cured, thermosetting plastics cannot be melted or
reshaped, limiting their reusability and repairability.
BRITTLENESS
Some thermosetting plastics can be brittle, making them
susceptible to cracking or breaking under certain impact
forces.
SLOW CURING
The cross-linking process of thermosetting plastics often
requires time and specific conditions, leading to longer
production cycles.
Disadvantage Of
Thermosetting
Plastics:
