Because it is a thermoformed plastic it doesn't come in weights that are directly comparable.

i.e. GRP cloth weights are gsm before resin is added, not sure how you turn gsm into a final weight or density as that is what really counts. Also the final weight of various gsm materials depends upon how well it is processed.

Anyway our material has a finished (processed) density of 1.5 grams/cm3 (g/cc). It has a glass content of 60% by mass and 35% by volume.

I think this is a farly long winded way of saying its about the same weight as GRP.

Gareth
www.fourhulls.com