Sunday, 2024-12-29
The daily puzzle:
What does '*****' mean in the following text?
"A ***** material is one that retains its strength at high temperatures. ASTM C71 defines refractories as "non-metallic materials having those chemical and physical properties that make them applicable for structures, or as components of systems, that are exposed to environments above 1,000 °F (811 K; 538 °C)". ***** materials are used in linings for furnaces, kilns, incinerators and reactors. They are also used to make crucibles."--++--++--
The answer and more (#)