ASTM D6979-18 Basicity in Polyols, Expressed as Percent Nitrogen

Scope:

ASTM D6979-18, Polyether polyols, and polyether polyol blends used in urethane processes can be tested using this method. This test method is appropriate for quality assurance, specification testing, and research. The results are used to estimate reactivity and are measures of batch-to-batch homogeneity. A polyol’s percent nitrogen can describe it or identify the proportions of different components in a polyol blend. If required, the data can also be expressed as equivalents of base per gram of material.

Procedure

In ASTM D6979-18, first, the Glacial acetic acid is used to dissolve the material, and the sample is adequately weighed. Then, a standardized perchloric acid solution in acetic acid is used to titrate the resulting single-phase solution to a potentiometric endpoint at room temperature. Finally, the results are presented as percent nitrogen.

Specimen size

Autotitrator Buret with Dosing Device, Potentiometric Automatic Titrator, 20-mL, and ​pH Glass Electrode and Reference Electrode or a Combination Glass Electrode is required.

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Data