آسیاب کردن سنگ گچ: را باید آسیاب و تا به ذرات ریزتری تبدیل شود. این مرحله با استفاده از آسیاب های گچ انجام می شود. تهیه محلول گچ: را با آب ترکیب نمود تا یک محلول گچ تشکیل شود.
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