Hydroforming with urethane

Just for sport, I made a die the other night from 6061t6511 The deepest details in the cavity were .06" The sheet sample I used was 5052? .020" I tried a .5" panel of urethane, maybe around 60-70 durometer, sort of worked, but the process destroyed the urethane. I tried again with .19" thick urethane, maybe 85 durometer, and got much better results.

I was curious who has played with this, if you can recommend interesting relative websites, and any suggestions on guidelines for this process.

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Jon Grimm
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