Pyrolitic boron nitride, pyrolitic boron nitride crucible, pyrolitic boron nitride cell, Quartz CERAMICS, LABORATORY ACCESSORY, LABORBEDARF, LABWARE, CRUCIBLES; DETAILS FOR GLASS FORMING MACHINERY - BUSHING ETC. CERAMICS FOR METALLURGY AND CHEMICAL INDUSTRY. QUARTZ GLASS. pyrolitic boron nitride ceramics, nozzle, corundum ceramics ...