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Deleterious organic materials in fine aggregates can be easily detected with the Organic Impurities Test, a simple, widely-used test. Samples are mixed in a special graduated colorless glass bottle with a 3% sodium hydroxide solution, then allowed to stand for 24 hours. If the color of the supernatant liquid above the test sample is darker than a standard reference color, organic compounds may be present and further testing should be done before approval.
HM-137 Gilson Organic Impurities Test Set includes six 8oz (240ml) graduated Impurities Test Bottles w/ lids, 1lb (454g) of Sodium Hydroxide (NaOH) Pellets and a circular Color Reference Disk with five reference colors. The sodium hydroxide pellets make enough 3% solution to perform over 150 tests. For areas with shipping restrictions, this set is available without sodium hydroxide as HM-137F. For strict compliance to ASTM and AASHTO Standards, HM-818 Reagent Grade Sodium Hydroxide Pellets can be ordered separately. Impurities Test Bottles are graduated in oz and ml measurements and have watertight screw-on caps. All individual set components can also be purchased separately.
HM-815 Color Reference Disk comes with five permanent, fade-free solid-glass reference colors of 5, 8, 11, 14 and 16 on the Gardner color scale mounted in a protective plastic frame. Individual Gardner Liquid Color Standards are alternately available for the same reference colors and also meet ASTM/AASHTO requirements.
HM-137: 6.0lb (2.72kg)
HM-137F: 4.0lb (1.81kg)
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