Starbalst Ultra blasting abrasive is designed for those applications that require more aggressive abrasive, such as steel maintenance, heavy rust, and paint removal. Starblast Ultra blasting abrasive is stronger than the Starblast and Starblast XL. While stronger than Starblast and Starblast XL, Starblast Ultra continues to offer the same product advantages, such as Greater blasting visibility due to considerably less dust generation. Lower labor costs through faster, more efficient cleaning. Fewer material costs due to reusability. Starblast Ultra is guaranteed to have less than 5% free silica, typically <3%. Rounded to subangular grains result in less abrasive embedment. Electrically non-conductive.