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Surface Material Tests
Video showing the process of casting a thin polyurethane table surface and incorporating it into a prototype where the surface indentations appear, then disappear.

Casting the first mold. 150ml of Part A and 150ml Part B polyurethane (PMC 121-30) mixed and poured over plexiglass with 2″ MDF walls compression strapped around. Spread out by hand with tongue depressors. Mold is 15.5″ x 15.5″ (inches). Wear gloves. Slippery, too.

Polyurethane left overnight (at least 16 hours to cure). Pealed off by hand. A bit difficult; maybe try some release agent next time.

Second mold attempt to make it thinner (1-2mm). Notice addition of side rails double-sided taped to plexi glass, which will act as guides in leveling the second pour of reduced amount (100ml Part A and 100ml Part B polyurethane (PMC 121-30)). Also note: both molds use masking tape as a release around perimetre of plexi, sticky-side in.

Second mold added 5% black dye.

Second mold (approx. 200ml total polyurethane) with 5% black dye, curing overnight.

First mold set in temporary clamps above MDF with 3″ inch bored hole.

Yoghurt container and duct tape for vacuum chamber underneath, with hose running to vacuum compressor (not pictured).




Hi Tobias, Jeff,
Tim Höfer, November 14, 2008I am not sure yet what exactly you are working on but it’s mindblowing already. Are you using Arduino for the table?