what is fibreglass? What properties does it have?

Answer 1

Fiberglass is a composite material made out of glass wool (reinforcing filaments) and epoxy (matrix). Glass wool are fine strands of glass. Each filament is quite strong. It is also very light. The epoxy glue is used to combine these fibers together in a rigid complex shape, which is also very light and strong.

Answer 2

Fibreglass is also known as glass fibre or fibre glass. The knowledge that fibres could be made from glass is probably as old as glass itself. Molten glass is viscous like treacle, and on being touched with anything, it will ‘string out’ to form a filament when it is drawn away. As glass is in a molten condition during its manufacture, these filaments must have been discovered at an early date. Nature herself produces glass fibres of this type from molten volcanic glass that is spun into fibres by the wind.
The generic term glass was adopted by the U.S. Federal Trade Commission for fibres of this type, the official definition being as follows:
“A manufactured fibre in which the fibre-forming substance id glass”