Still worth testing, but it is difficult to know what to test. I have an idea for building hulls with a work around for the weak shear properties of EPS. But the only way i can see to test it would be to build a hull and see what happens. This could be expensive and, to the engineering purist would not be conclusive.
I have ordered some of the 400, which I will infuse, bend, bash, and peel apart. If it is successful, I'll build a small tender, (or maybe a camping hull for Elementarry) to try the next stage.
If you want to send me a 12" x 12" sample of 25mm 700 I will repeat the tests and compare the results. Could you get 10 sqm and 100 sqm price for the 25mm 700, please? Ta.