[Minor Bug 1.23] Construction Foam?

From the description I read this as the foam has an 'expansion' phase when it's malleable and then a permanence phase when it is not. If it's like glass where breaking it doesn't drop anything then I don't think it's a good enough material. Glass at least is translucent and can be crafted from stone via maceration and re-heating, so it's redeemable as an end-product of the lava/magma+water infinite supply chain. Clay however could only be produced via uu-mater and this is simply far too costly for these ends.

You can make clay blocks by forming 4 clay balls into a square. It also has an alternate recipe in ic2, but I can't remember it. Clay is super-common in 1.8 maps so I imagine the alternate recipe is not necessary.