Use with caution - twice as thick doesn't necessarily mean twice the standoff voltage, for a bunch of complex reasons (density variations, flaws, unequal charge distribution etc).
Still, this is too good to not post:
http://www.professionalplastics.com/pro ... astics.pdf
Here - just in case the link goes away.
Dielectric strength of plastics
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Doug Coulter
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Dielectric strength of plastics
Posting as just me, not as the forum owner. Everything I say is "in my opinion" and YMMV -- which should go for everyone without saying.