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Physical Properties


Specific gravity 2.82
Index of refraction 1.58
Hardness (Moh’s scale) 2.5
pH value (BS 3483) 7.7
pH for distilled water 5.2
Oil absorbtion 60-90 g/oil
(BS 3483) 100g Mica
Water Soluble Not more
(BS 1765) than 0.5%
Effect by common acids Slight
Phericity Factor 0.01
Softening point 2800°F
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