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Mixture of C6 aliphatic hydrocarbons (CAS RN 92112-69-1), containing by weight 60 % or more but not more than 80 % of n-hexane (CAS RN 110-54-3), with: -a specific gravity of 0,666 or more but not more than 0,686, -a total of carbonyl compounds of less than 1 ppm, -a total of acetylenic compounds of less than 2 ppm