I am working on an idea to deploy six pointed three dimensional glass stars on icy roads when needed to raise the coefficient of friction during stopping or turning/control events. I have produced a limited quantity and found excellent results that far exceed the usual sand/salt applications. The obvious problem is the broken glass itself when it fractures on the road surface. I understand that heat tempering such a small structure (about 1/4" point to point) is difficult. Is there a possible way to temper these glass stars so that they maintain their formed shape (not sharp) until they fracture and disintegrate to glass powder the way tempered glass does when it breaks.
The concept is explained more fully at icyroads.net
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