種々の形を持つ耐火物。並型(JIS R 2101の規定 230×114×65mm)などの直方体れんがや、横ぜり、縦ぜり、ばち形など、使用目的に応じて様々な形状が製造されている[1]。化学組成の違いでは、クロム煉瓦、マグネシア煉瓦、けい石煉瓦、粘土質耐火煉瓦、高アルミナ煉瓦などに分類でき、用途や要求温度に応じて使い分けが行われる[2]。
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