What is a good insulating material that can be readily machined into the desired shape?

Bakelite is an excellent choice for an insulating material that can be readily machined into the desired shape. It is a type of thermosetting plastic that hardens when molded and retains its shape and properties even after the application of heat. This makes Bakelite ideal for electrical applications, as it is not only a good insulator but also highly durable and heat-resistant.

Moreover, its machinability allows for it to be easily shaped into various forms, which is crucial in electrical applications where precise dimensions are necessary for components. Its characteristics combine to make it a widely used material in electrical insulation.

While rubber offers good insulating properties, it can be more challenging to machine into specific shapes compared to Bakelite. Glass is an excellent insulator but is typically brittle and not as easily machined into various shapes without specialized techniques. Plastic, while also machinable and insulative, varies significantly in terms of its properties depending on the type, and may not provide the same level of thermal stability as Bakelite in demanding environments.