Hi Guys
I'd be very suprised if Flotex was made of glass although it does have a glass fibre base which i was involved in the development of in the late 70's, when the Flotex UK plant opened.
It has nylon fibres stuck into PVC coated onto the glass tissue.
As for recycled glass this is again probably referring to the base rather than the fibre which would be too brittle,
Cheers
Doug