The first fully synthetic fibre, produced entirely from petrochemical-based substances, is :
Nylon
Silk and wool are natural fibres obtained directly from animals, so they are not synthetic at all. Rayon is often called a semi-synthetic fibre because it is manufactured by chemically treating a natural raw material, cellulose from wood pulp, rather than being built entirely from petrochemicals.
Nylon, on the other hand, was developed by polymerizing petrochemical-derived monomers with no natural fibre content, making it the first fibre synthesized completely from petrochemical-based substances.
Therefore, the first fully synthetic fibre is nylon.
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