Last month I met an artist from a nearby Ohio town. When he learned I was a woodcarver, he asked if I had ever tried carving high-density urethane. I’ve carved the rubber centers in golf balls, the core of softballs and Potatowood but never urethane. I learned that this HDU is used for sign making and is designed to be durable enough for outdoor use. My new friend, a sign maker, uses power routers, Dremels, pneumatic tools and saws to shape the material on a larger scale than I work, but I was interested in trying to use regular woodcarving tools. I was told the material is very expensive so my friend keeps his larger scraps, just like me with my wood scraps except I seem to keep everything. He generously gave several pieces to me for experimental purposes. The scraps are 2 inches thick but can be laminated to increase that dimension.
I have two densities now. One is called Signfoam and at 15 pounds per cubic foot, it’s easier to use of the two. It’s white with a smoother surface when carved. The second type, from Jasper Products, is darker with a grainier rougher carved surface. At 18 pounds per cubic foot, it doesn’t appear to be as dense. I can’t explain the logical contradiction except that it is a different compound.
I prefer the 15 PCF foam but, in both densities, a slicing cut is required. I used a carving knife for most of the work. A gouge will work but only if it’s rotated to make a slicing cut. A V-tool is not very effective because it’s usual cutting method tends to crush the material and a slicing action is difficult. I had to resort to using a knife for making hair.
Here is a link to a vendor if you want to learn more. http://signfoam.com/carving.html
The first two examples are from the Signfoam.
This is an example from the Jasper Products foam. You should be able to see the rougher texture.
I still have some of both left so I may do some more experimenting. It is interesting but I’ll stick to Basswood for now.