Yes, there is a huge difference between Polyethylene (PE) and Polyurethane (PU). PU is like the cushions in your couch whereas PE is like the inserts you find in tool kits.
Generally speaking, Ester is a higher end polyurethane with better tensile, elongation and tear strength characteristics. Ether is very good for most applications but loses its rebound faster over time.
This depends greatly on the application. The higher the density, the more it can withstand higher weight being applied, but will be less flexible overall and more costly. Sometimes the best way to determine desired density is to perform some preliminary testing with the particular application using various densities of foam.
Uncoated polyurethane foam will quickly succumb to the elements. The biggest proponent of its deterioration is UV light found in sunlight. In direct sunlight, the foam will become discolored (in as little as 1 hour) while molecularly the UV light breaks down the integrity of the foam. Once this happens, rain gains a foothold furthers the deterioration until the foam begins crumbling apart. Even a little bit of protection from the elements can go a long way in preserving the foam’s characteristics. Simply putting the foam in a cardboard box will protect it from the adverse effects of sunlight.
Sure. We can either send you a Sample Kit that has several pieces of our most common foam or we can make you a prototype for your current project. Simply Contact Us to request either.
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No job is too hard or too big for us. If it needs foam then we can make it and send it anywhere in the world.