If aggregate contains organic impurities it may not be suitable for inclusion in concrete. Organic impurities, usually tannic acid and its derivatives, may interfere with the chemical reactions of hydration. Impurities are more likely to be found in fine (sand) aggregate.

Glass Bottle - 300 ml

12 ounce (300 ml approx) capacity, graduated at 2, 4 and 7 ounce positions. Sodium Hydroxide pellets are required but not supplied by ELE.
Complete with screw cap.

Complies to ASTM C40

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Colour Standard to ASTM C40

With five organic colour transparencies mounted in a holder.

Complies to ASTM C40, AASHTO T21

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