Piece of perspex or similar (Gayton CH60)

We have to slide our tumble dryer out to use it and floor underneath has obviously deteriorated a bit so am looking for piece of perspex type material to put underneath. This could be an old scratched bit obviously from a window or suchlike. Approx 600mm x 600mm (2 foot square) is needed or 2 narrower pieces might work. Thanks for looking :)