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Hydrated Lime is a dry powder mainly composed of calcium hydroxide Ca(OH)2. It is a colorless or white powder, which is obtained by hydrating Quicklime (Calcium Oxide) using specific equipment called hydrator in a process called hydration. ... 54.27% - Silica as SiO2: 0.98% - Calcium Carbonate as CaCO3: 96.87% Origin: Oman Supplier Of Limestone ...