Insulators... Questions about!

[Dead-End Insulator]

Hello!

Name is Brian, I work in a factory that produces a type of insulator for power-line applications. All I know about the product is we make three sizes, two different materials, and they are called "Dead-End Insulators." They are made of a rubber-material over a FG rod with special hardware on the ends.

We also market a line of ceramic insulators.. many different styles.

I am not advertising... on the contrary I am trying to gather more information on insulators, what they do, what kind does what and stuff of that nature.

Are there any websites, text-books or other information sources out there that ya'll can recommended?

Thank you for your help!