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Question 42 of 47

Q.Write the uses of Silicones.

Tamil Nadu DgeTamil Nadu HSC (DGE) Board 2023Subjective· 2mImportance★★★★★
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Silicones are synthetic organosilicon polymers (−Si(R)2−O−-Si(R)_2-O- repeat units) valued for chemical inertness, thermal stability, and water repellency, giving them a wide range of industrial and medical uses.

Silicones are used: (i) as water-proofing agents — coated on fabrics, paper, and wood to make them water-repellent, since silicones repel water while allowing air/moisture vapour through;

(ii) as electrical insulators, in electrical equipment and switches, because of their good dielectric strength and stability at high temperature;

(iii) as high-temperature lubricants and greases in machinery, since silicone oils remain stable and do not thicken or thin drastically across a wide temperature range;

(iv) as sealants and adhesives in construction and automotive applications, due to their flexibility and resistance to weathering; …

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