Name the First Fully Synthetic Fibre also name it Ingredient

Answer:

The first totally synthetic fibre was nylon. Fabrics and textiles are composed of synthetic fibres rather than natural fibres. Nylon is a polymer made up of chemical polyamides. 

It is the strongest synthetic fibre and can be moulded into any shape. Nylons are a type of polyamide created by combining carbon-based compounds found in coal and petroleum in a high-pressure reaction.

Synthetic Fibres:

Synthetic fibres are fibres created by humans through chemical synthesis, as opposed to natural fibres generated directly from living organisms such as plants (such as cotton) or animal fur.