Ready-to-use, water-based, refractory claylike materials can be press molded to form shapes and then dried/sintered to yield high-density parts. Three of these refractory clays are offered – RefClay Y (based on Yttrium Oxide and usable to 1400 C); RefClay Z (based on Zirconium Oxide and usable to 1600 C); RefClay ZRP (based on proprietary Zirconium composition to yield near-zero CTE and usable to 1500 C).