Descriptions: Ceramic End Cap. Electricity saving rate: 30% Infrared normal direction radiant rate: over 94%. Electric heat transformation rate: over 98%. Quartz heaters consist of a helically wound resistance coil housed in a tube of pure vitreous silica fused quartz tube. Both ends are connected to special ceramic insulators,The ceramic insulators are attached to the quartz tube by high temperature cement which allows strong support for the end terminals. Applicance: widely used for electric heater.