Technical material engineering question

Where's da brains on TT?

I need a cheap, mixable, pourable substance that sets like ultra-hard rubber, holds it's form, doesn't stick, is relatively thermally stable, can be machined, and I can re-use over and over again. I need it as a mould at 350mm dia x 50mm thick and I need to mix, pour and fix on site. Colour is irrelevant.

Any ideas?

Have u tried mixing Olive Oil, Egg, Baking Powder, Sugar and Yeast? Dont know if it will work, but what u descrive above reminded me my mum's cake.

playdoh?

This the stuff you are looking for?

I wouldnt know where to find it in Munich though.. or come to think of it, anywhere!

SIN, In so of france, I used a product called SILICAST to make molds for small decorative forms. Purchased this 3chemical mix in boat/ship supply outlet. Is flexible in different grades, can withstand plastic/plaster casting for limited time depending...of course is toxic but after initial usage when dry(5 days-25°c),it sets extremely exact taking impressions of the tiniest hair or wrinkle. don't know where to get this stuff in Germany. I think SILICAST may have a site-in French? If you locate it, let me know, for I need same for art project. good yuk, TOMCATTOO

Thanks Grinner. That certainly looks like the stuff I need. It just looks like UTC don't sell it outside their own production. bluedave put me on to Tufnol, but sadly that is a pre-formed product, and not one that you can mix-pour-fix in the field.

Another option is stuff called vinamould. It is a hot melt hard rubber mould that can be melted in the microwave before pouring. it sets very hard and I have used it many times for casting fibreglass items etc.

Thanks all. I think I've found the stuff now. It was complicated. I need to mix and pour up to 500cm³ of the stuff and pour it for a complex engineered laser mirror polishing mould inside a metal polishing ring. It has to cure overnight and has to be reusable for hundreds of these mirrors.