Which product is a silicone sealant used to encapsulate backs of cannon plug casings, eyelets and grounds, creating a protective barrier from the environment?

• A. RTV 3145
• B. RTV 3140
• C. Type III
• D. Anti- seize

Answer: (A)

The main idea is using a silicone encapsulant that cures neutrally and creates a durable, flexible barrier against moisture and contaminants for metal connectors. RTV 3145 fits this role because it is a neutral-curing silicone sealant designed for electrical encapsulation. It bonds well to metal surfaces like cannon plug casings and grounds, forms a protective, moisture-resistant layer, and remains flexible to handle vibration and temperature changes without cracking. It also avoids corrosive byproducts during cure, which helps protect metal parts.

In contrast, RTV 3140 typically cures with acetoxy chemistry, which releases acetic acid and can corrode metal surfaces and connectors. Type III isn’t a silicone encapsulant suitable for environmental sealing, and anti-seize is a lubricant, not a sealant, so it wouldn’t provide the protective barrier.