Silicone is an RTV sealant.

• A. False
• B. Not used in automotive sealing
• C. Only at high temperature
• D. True

Answer: (D)

Silicone used as an RTV sealant means it cures at room temperature to form a flexible, durable seal. RTV stands for room-temperature vulcanizing, and silicone sealants are classic because they cure without heat, bond well to metal, glass, and many plastics, and withstand wide temperature ranges while resisting oil and coolant exposure. In automotive sealing, these properties make silicone RTVs common for gaskets, weatherstripping, windshield sealants, and other joints that must stay flexible as the engine heats and cools. Because of this, the statement is true. The other options don’t fit because silicone RTVs are indeed used in automotive sealing, they’re not limited to high-temperature use, and they cure at room temperature.