Which of the following insulating material CANNOT be used for high voltage cables?

Insulating material for high voltage cables

High-voltage cables require insulating materials with high dielectric strength, mechanical durability, and resistance to moisture and environmental conditions.

• Impregnated paper: Used in high-voltage applications due to its excellent insulating properties when impregnated with insulating oil.
• Rubber: A good insulator used in various electrical applications.
• Vulcanized rubber: More durable and resistant to environmental factors than natural rubber.

Silk has some insulating properties, it is not suitable for high-voltage cables due to its low dielectric strength, poor moisture resistance, and mechanical weakness.