CERPASS® HTB is a seeded gel product is a durable ceramic grain manufactured by Saint-Gobain Grains & Powders. CERPASS HTB® modifies the chemical composition to minimize grain growth at high temperatures which stabilizes the nano-structure and allows for vitrified bond systems at 1250C. The aggressive grain is available in treated (HTB-0537), and untreated (HTB-0535) macro-grit grains that conform to standard ANSI or FEPA sizes 20-150.