... ?1. Made by flint clay clinker and binder,Website:http://www.qunhuirefractory.com, through Crushing, Mixing, Shaping, Drying and high temperature Sintering ... %3%Bulk density≥ 1.9 ~ 2.0 g/cm3≥2.1 g/cm3≥2.1 g/cm3Refractoriness≥1670ºC≥1700ºC≥1730ºCApparent ... , Bulgaria, Finland, Greece,Spain, Congo, Angola, South Africa, and Maldives,Jordan and so on. The export figure is more than USD ...