Si₃N₄ Insulating Ring Brands Leading manufacturers of silicon nitride rings for electrical and thermal insulation. #Si3N4 #Insulators #EngineeringCeramics https://www.advancedceramics.co.uk/blog/key-factors-determining-the-quality-of-single-crystal-silicon-purity-bubbles-and-crystallization-of-quartz-crucibles/