Expanding polyurethane foam for plug deisgn?

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Expanding polyurethane foam for plug deisgn?

Expanding polyurethane foam for plug deisgn?

Author	Message
20_rc51_00	20_rc51_00 posted 11 Years Ago HOT Topic Details
Group: Forum Members Posts: 95, Visits: 548	Anyone use this type of material in the past? http://www.smooth-on.com/Rigid-and-Flexible/c10/index.html There are various densities, I have tried the 3lb density but it seemed a bit too soft and the surface next to the mold that I poured it in seemed to stay soft and not hard like that exposed to the air. Also the cells on the mold side seemed to crush/pop on their own once pulled from the mold under atmospheric pressue. \ I was thinking that a 8-10lb density would be better for shaping and then surface finishing. Any thoughts or suggestions?
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Hanaldo	Hanaldo posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	Out of interest, would this (or rather, the stuff you can get from hardware stores, eg. https://www.masters.com.au/product/902404820/fuller-fula-foam-fire-resistant-500g) be suitable for similar methods to that used in the EC pattern making tutorial? Ie. closed cell foam core (probably Corecell SAN foam) spine, then use expanding polyurethane foam instead of the PU foam blocks that EC uses? I know it would be a lower density, but would that be a huge issue? Would it still work fine with filler, etc? Reason I ask, is local supply of PU foam is quite limited to me. Minimum order is 2500x1500mm sheets, which works out quite expensive. When I only want to make one smallish part, it makes it quite unaffordable... Would this be a cheap alternative?
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Matthieu Libeert	Matthieu Libeert posted 11 Years Ago HOT Post Details
Group: Forum Members Posts: 955, Visits: 3.4K	It could surely work! make a skeleton out of wood for example, fill the gaps with PU-foam from spraycans from a DIY store an then sand. I know a lot of carframe and bike-modelors using a similar method, sometimes with wireframe as well to create a better curve in models. an other way of working is using insulation foam they sell in diy stores, It is mostly PU foam as well and can be very cheap! Matthieu Libeert Founder MAT2 Composites X Sports website: www.mat2composites.com
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