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Viscosity is a property of fluids. Since calcium oxide is a solid at ambient temperature (ca. 20°C) such a study does not need to be conducted for this substance (melting point: >450°C) (in accordance with section 1, Annex XI of regulation (EC) 1907/2006 (REACH)). Calcium carbonate is also a solid which remains solid at temperatures significantly above room temperature (melting point >825 °C). OECD Guideline no. 114 on the viscosity of liquids, indicates that the substances to be tested must be liquid at room temperature, and therefore a study of the viscosity of calcium carbonate is not required.

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