Starblast blasting abrasives is a general purpose staurolite abrasive used in steel fabrication and bridge maintenance to remove rust, mil scale and weathered coatings. Starblast XL, at less than 1% free crystalline silica, meets the most stringent industry and military specifications. Starblast & Starblast XL offer the same product advantages, such as: Greater blasting visibility due to considerably less dust generation. Lower labor costs through faster, more efficient cleaning. Less material costs due to reusability. More uniform blasting pattern. Starblast is guaranteed to have less than 3% free silica, and Starblast XL less than 1%. Rounded to subangular grains result in less abrasive embedment.