Question

1. Write down the properties as well as uses of the following:
i) Polythene
ii) PVC
iii) Perspex
iv) Teflon
v) Bakelite
vi) Melamine

Answer 1

i) Polythene 1) It is water resistant. 2) It is strong but flexible and can be rolled into sheets and moulded into different shapes. Uses: Polythene sheets are used for the packaging of liquids such as milk.

ii) PVC PVC has been used extensively in a wide range of construction products for over half a century. PVC's strong, lightweight, durable and versatile characteristics make it ideal for window profiles.

iii) Perspex A high gloss, hard surface. Perspex® is one of the hardest thermoplastics and remains aesthetically attractive for much longer than many other plastic sheet products.

Answer 2

Answer:

Explanation:

1)Characteristics of polythene are as follows:

have low strength.

Polythene is of two types high density and low density.

2) Teflon

Teflon has the following properties: it is inert to the atmosphere and chemical substances. both water and oil do not stick to the teflon coated articles. it has a high melting point i.e. 327∘C which means there is no effect of high temperatures on it.

3)Bakelite

Bakelite has a number of important properties. It can be molded very quickly, decreasing production time. Moldings are smooth, retain their shape and are resistant to heat, scratches, and destructive solvents. It is also resistant to electricity, and prized for its low conductivity.

4) Melamine

Melamine is highly stable and can resist high temperature exposure as well as physical and chemical degradation. Melamine is also a flame retardant and also possesses properties like hardness, scratch and moisture resistance.

5)PVC

Electrical Properties: PVC may be a good insulation material, because of its good dielectric strength.

Durability: PVC is immune to weathering, chemical rotting, corrosion, shock and abrasion. it's therefore the well-liked choice for several long-life and outdoor products.

6)Perspex

It

is one of the hardest thermoplastics and remains aesthetically attractive for much longer than many other plastic sheet products. High tensile strength and rigidity. Perspex® is ideal for applications where surfaces that are resistant to bending or deformation are required.

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