ASTM D5155-19 Determination of the Isocyanate Content of Aromatic Isocyanates

ASTM D5155-19 Determination of the Isocyanate Content of Aromatic Isocyanates

The ASTM D5155-19 method is specific to measure the isocyanate content of aromatic isocyanates used as polyurethane raw materials. The isocyanate sample is reacted with a large amount of dibutyl amine to make the corresponding urea. The values stated in SI units are to be regarded as standard.

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    ASTM D5155-19 is crucial for research or quality control to characterize isocyanates used in polyurethane products. All three test methods are essential for determining crude or modified isocyanate content of suitable reactivity and solubility.

    Test Procedure 

    In all three test methods given in ASTM D5155-19, the isocyanate sample is reacted with an excess amount of dibutyl amine to form the corresponding urea. The NCO content is determined from the amount of dibutyl amine consumed in the reaction. The test methods differ in the reaction conditions, solvents used, or both.

    Test MethodsSection
    Test Method A (Unheated toluene-dibutyl amine)Section 10-14
    Test Method B (Heated toluene-dibutyl amine)Section 15-19
    Test Method C (Unheated trichloro benzene toluene-dibutyl amine)Section 20-25

    Specimen Size

    Laboratory humidity of the samples to be tested by ASTM D5155-19 must be kept low, preferably below 50 % relative humidity.


    The ASTM D5155-19 test result is the average of duplicates, expressed as percent NCO, to the nearest 0.01 %.


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