1) Professional manufacturer for Refractory Balls 2) Al2O3: >65% 3) Size: 20mm,30mm,40mm,50mm,60mm Refractory ball usually used in shift converter and reformer in ammonia plant. Refractory ball has a lot of advantages, such as:1) High strength, long use period.2) Chemical stability, it wont react with our materials3) Good performance of resistance high temperature, resistance high temperatue up ...