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## Properties - Thermocole is spongy, porous and has foam like structure. - Though it is extremely light, but it is quite strong. - Its density is low (22 kg/m³). - It is quite shock proof. - It is chemically inert and resists ageing. - It has extremely low thermal conductivity (0.27 kcal/m²/°C/hr)...

## Properties - Thermocole is spongy, porous and has foam like structure. - Though it is extremely light, but it is quite strong. - Its density is low (22 kg/m³). - It is quite shock proof. - It is chemically inert and resists ageing. - It has extremely low thermal conductivity (0.27 kcal/m²/°C/hr). - It has low electrical conductivity. - It can be used upto 55°C. - Its tensile strength, compressive strength and shear strength are quite high. ## Applications - It is mainly used as heat insulator in refrigeration and air conditioning due to outstanding thermal insulating properties. - Thermocole is used as ideal packing material for delicate electrical and electronic equipments being it light and shock-proof. - It is used for decorative purposes. - It is used for protecting screens in radars. - Thermocole is used as a core in sandwich panel. ## Thermocole - How thermocole is prepared? - Write four applications and four properties of thermocole. ## Polymers (Plastic) - Define thermocole. Explain its preparation, properties and application. - Define thermocole. Give its properties and applications. ### Preparation - Thermocole is a foamed plastic obtained by blowing air through molten polystyrene or polyurethanes. - It is spongy, porous (having 3 to 6 million fine air cells or pores per litre) foam like in structure. - Because of large number of air cells, it possesses an outstanding insulating property. - Plastic is a material, which has capacity to get deformed or change the shape under pressure. i.e. It possess the property of plasticity. - A word plastics has been obtained from Greek word 'Plastikos' which means fit for moulding. - Now-a-day plastics have replaced a number of traditionally used materials such as various metals, ceramics. - Hence, plastics are mostly employed in production of various articles such as buckets, pipes, fabrics, bowls, bags, wrappers, toys, etc.