I'm currently designing a carbon fibre bicycle frame. I plan on making a monoque mould out of fibreglass, filling this with an expanding foam to make a blank frame, then wrapping the foam in carbon. The final step is to dissolve out the foam once it's all cured. My question is, which foam would be best to use?
Now, polystyrene is the obvious one as it's dissolved by acetone, but I can't seem to get hold of any PS that hasn't been fully expanded to use in my own mold. Plus, I'm not sure how easy it would be to get steam throughout the mould. So I'm hoping for something I can get from a DIY store. It seems the yellow builders foam is impervious to everything but lava so that isn't suitable (it will probably be used for the prototype though).
SO, can anyone point me in the direction of an easily get-hold-able expanding foam that can be dissolved out with a liquid? Oh, and the liquid can't be damaging to the epoxy.
Thanks for your thoughts!