Plastics are organic polymers that can be molded into any shape when heated. They have properties like low cost, a wide color range, water resistance, and low electrical and thermal conductivity. Raw materials for plastics come from animal and plant byproducts as well as coal and petroleum byproducts. Plastics are classified as thermoplastics, which soften when heated and harden when cooled, allowing remolding, and thermosets, which permanently harden and cannot be remolded or softened by heat. Common thermoplastics include polythenes, polystyrenes, and nylons, while important thermosetting plastics are polyesters, phenolic, and epoxides

1. PLASTICS

2. PLASTICS
• It is a organic polymer
• It can be moulded in to any desired shape with
the help of heat.
• Properties such as:
– Low cost
– Color range
– Water resistance
– Low electrical and thermal conductivity.

3. SOURCES OF RAW MATERIALS OF
PLASTICS
• Animals and vegetables by products.
• Coal by products (Distillation of coal)
• Petroleum by products ( refining of crude oil)

4. CLASSIFICATION OF PLASTICS
• THERMO PLASTICS
• THERMO SETS
– THERMO PLASTICS:
• Plasticity increases with increase in temperature
• Its liquid when heated hardened when cooled
• Its are soft and ductile
– THERMOSETS:
• Permanent hard , not soften when heated
• It cannot be remoulded
• Its harder, stronger, more resistance to heat.

5. COMMODITY AND ENGINEERING
PLASTICS
• Commodity plastics are used for a commodity
purpose( home).
• Engineering plastics are used for the
engineering purpose.
• Both plastics are having
– Thermo plastics
– Thermo sets plastics.

8. IMPORTANT THERMOPLASTICS
• Polythenes
• Polystyrenes
• Polyvinyls
• Acrylics
• Polyamides(Nylones)
• Polytetrafluoro ethylenes(Teflon)
• Cellylosics

9. IMPORTANT THERMOSETTING
PLASTICS:
• Polyesters
• Phenolic
• Urea formaldehyde
• Melamine formaldehyde
• Epoxides.