State various thermal insulating materials. State any two properties of insulating material

State various thermal insulating materials. State any two properties of insulating material
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1 Answer

Answer :

Thermal insulating materials:

1) Asbestos

2) Aluminum Foil

3) Thermocol

4) Saw dust

5) Cork board slabs

6) Foam glass

7) Rock Wool

8) Glass Wool

9) Concrete Block

10) Flexible Blankets

11) Gypsum Boards

Properties:

a) It should be fire proof

b) It should not absorb moisture

c) It should be easy to handle

d) It should be chemical proof.

e) It should be bio resistant and dry

f) Bulk density should be below 600kg/m3

g) Pores: Most of the common insulating materials are porous in structure.

The entrapped air or any other gas within the pores decreases the thermal conductivity of the material.

h) Presence of Moisture: with the increase in moisture content, the coefficient of thermal conductivity rises greatly

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