On Wednesday, 20 September 2017 13:02:44 UTC+1, The Natural Philosopher wrote:
I think what the OP really needs is the sort of stuff tablecloths are
made of.

https://www.iwantfabric.com/uv-resis...er-fabric.html

0.75 mm thick

Dental dam is thinner (0.125 mm), but usually latex

http://www.propdog.co.uk/dental-dam-Ultra-Thin-latex

Owain