CoorsTek 65565 High-Alumina Combustion Boat, 15ml Capacity, 100mm Length, 10mm Width, 13mm Height Alumina-ceramic combustions boats are ideal for chemists, metallurgists, and other scientists involved in high-temperature work demanding contamination-free results Recommended for use with refractory metals such as molybdenum, platinum, rhodium, tungsten, tantalum and iridium Permeability: Gas-tight. Water Absorption: None. AD-998 High-Alumina properties include a maximum use temperature (without load) of 1750C