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ASTM D5629-16

ASTM D5629-16

Standard Test Method for Polyurethane Raw Materials: Determination of Acidity in Low-Acidity Aromatic Isocyanates and Polyurethane Prepolymers

2016-12-27 /Active
Significance and Use:

5.1 This test method is suitable for research or for quality control to characterize aromatic isocyanates and low-acidity prepolymers. Acidity correlates with performance in some polyurethane systems.


1.1 This test method measures the acidity, expressed as ppm of hydrochloric acid (HCl), in aromatic isocyanate or polyurethane prepolymer samples of below 100 ppm acidity. The test method is applicable to products derived from toluene diisocyanate and methylene di(phenylisocyanate) (see Note 1). Refer to Test Method D6099 for determination of acidity in moderate- to high-acidity aromatic isocyanates.

1.2 The values stated in SI units are to be regarded as the standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Note 1: This standard is equivalent to ISO 14898, Method B.

acidity; aromatic isocyanates; isocyanates; methylene-bis-(4-phenylisocyanate); methylene di(phenylisocyanate); methylene diphenyldiisocyanate; MDI; prepolymer; polyurethane; raw materials; test method; TDI; titration; toluene diisocyanate;
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