Grey Pro - Poisson's ratio

In my design calculations I need the Poisson’s ratio for the cured Grey Pro resin; I don’t see it on the datasheet, is there a Formlabs document where this valus is stated?
I’m guessing that the Poisson’s ratio is around 0.35, but I would like to quote a value with some confidence.
If anyone has a reliable value, I would much appreciate.
Regards, Tim