This document describes four methods for determining the hydroxyl number of polyether polyols used in polyurethane production: -- Method A: Phthalic anhydride method; -- Method B: Acetic anhydride method; -- Method C: Pyromellitic dianhydride method; -- Method D: Near-infrared spectroscopy. This document applies to the determination of hydroxyl numbers in research and development, quality control, and specific testing scenarios for manufacturers, users, or third parties of polyether polyols.
Basic Data
Standard ID
GB/T 12008.3-2026 (GB/T12008.3-2026)
Description (Translated English)
Plastics - Polyether polyols for use in the production of polyurethane - Part 3: Determination of hydroxyl number
Sector / Industry
National Standard (Recommended)
Classification of Chinese Standard
G31
Classification of International Standard
83.080
Word Count Estimation
15,156
Date of Issue
2026-07-02
Date of Implementation
2027-02-01
Older Standard (superseded by this standard)
GB/T 12008.3-2009
Issuing agency(ies)
State Administration for Market Regulation, Standardization Administration of China
