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R&R GLASS-CAST BANDUST 101 is an economical, all-purpose mold material for kiln casting/slumping of glass. It has very fine particles, providing the smoothest of surfaces. R&R GLASS-CAST BANDUST 101 has sufficient strength for most glass castings of small and medium size. It is the investment of choice for open-face molds and small molds made using the lost wax process. Made using technology that reduces respirable dust during the investing process.