keemiline ühend (oksiidid, nitriidid, karbiidid, intermetalliidid jne), mille sulamistemperatuur on reeglipäraselt üle raua sulamistemperatuuri 1539 °C (vt rasksulavus)
a material (usually inorganic, non-metallic, ceramic) of very high meltig point with properties that make it sustainable for such uses as furnace linings (see: refractoriness)
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