This document discusses properties and uses of natural rubber, timber, and plastic. It describes that natural rubber is derived from rubber tree sap and is an elastic hydrocarbon polymer called isoprene. Timber refers to any wood used in engineering construction, and it has natural and artificial defects as well as properties such as strength, flexibility, and cost effectiveness. Plastic is made through polymerization of monomers like ethylene and polyethylene, and there are two types: thermo-plastic and thermo-setting plastic. The document lists many common uses of these materials such as flooring, packaging, furniture for timber, and bottles, bags, and CDs for plastic.

1. VERY GOOD
AFTERNOO
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2. GROUP MEMBERS

4. Lecturer at
Port City International University
Dept. of Engineering

6. o Derived from sap of rubber tree
o Hydrocarbon polymer
o isoprene

7. (i) Natural Rubber
(ii) Artificial Rubber
(Synthetic)

8. o Tension
o Shear
o Insoluble in water
o Elasticity
o Deteriorate easily by oil, grease, fat
o An elastomer (large elastic deformation

10. Any wood which is used in
engineering construction is
termed as timber

11.  NATURAL DEFECTS
 ARTIFICIAL DEFECTS
DEFECTS OF TIMBER

12.  Temperature Effect
 Environmentally Friendly
 Strong And Light weight
 Safe
 Easy to install
 Cost effective
 Flexible
PROPERTIES OF TIMBER

13.  VENEERS
 PLYWOODS
 LAMINATED BOARD
 BATTEN BOARDS
 RECONSTRUCTED WOOD
INDUSTRIAL FORMS OF TIMBER

14.  CEILINGS
 DECORATIVE PURPOSES
 DOORS
 PARTITION
 FURNITURE
 INSULATING BOARD
USES OF TIMBER

15.  ORGANIC SUBSTANCE
 USE IN REPAIR MATERIAL
 RIGID AND STABLE
PLASTIC

16. • ETHYLENE
• POLYTHELENE
POLYMERIZATION

17. • There are two types of plastic based on heat
treatment.
• (i) Thermo-plastic
• (ii) Thermo-setting plastic
TYPES OF PLASTIC

18.  APPEARANCE
 DUCTILITY
 DIMENSIONAL STABILITY
 MAINTENANCE
 STRENGTH
PROPERTIES OF PLASTIC

19.  Carbonated Drinks Bottles
 Plastic Film
 Flooring
 Supermarket Bags
 Plastic Bags
 CD
 Food Packaging
USES OF PLASTIC