... 10,13,19,25,38,50mm 99% High Alumina Ball for Ethylene Dryers XINGFENG 99% High Alumina Support Media is equal Denstone 99 ... silica (SiO2 ), it's a very excellent and ideal product for high temperature and steam applications, such as secondary reformers in ammonia ... thermal properties, with its high density high-temperature resistance 1550°C , also it's a good choice for heat retention or equilibration ...