Which insulators are considerably lighter and more durable?

• A. Ceramic
• B. Polymer
• C. Glass
• D. Porcelain

Answer: (B)

Insulator performance in the field often comes down to weight and how well the material ages outdoors. Polymer insulators use a fiberglass core with a silicone (or epoxy) housing, making them light yet strong. The silicone outer layer is hydrophobic, so water tends to bead and shed rather than form a continuous conductive film, which helps prevent leakage paths and improves reliability in wet or polluted conditions. Because of this mix of light weight, good mechanical toughness, and weathering performance, polymer insulators are considerably lighter and more durable than traditional porcelain, ceramic, or glass insulators.