Final answer:
Ceramic ferrules are considered the best material for various reasons, such as their excellent thermal and electrical insulation properties. They are widely used in high-voltage applications.
Step-by-step explanation:
Ceramic ferrules are currently considered the best material for a number of reasons. They have excellent thermal and electrical insulation properties, which make them suitable for high-voltage applications. Additionally, ceramics have high melting temperatures, high hardness, and chemical resistance. These properties make them ideal for use in insulating connectors and as an insulating material around high-voltage wires.