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По прочности керамзит делят на марки от П 15 до П 400 https://al-keram.ru/blog/keramzit-otlichnyj-material-dlya-teploizolyatsii-zdanij.html В этом случае более высокая марка соответствует и более высокому качеству материала и сырья, из которого он произведен https://al-keram.ru/blog/5-10.html Материал более ...
