GB/T 12008.3-2009
Plastic.Polyether polyols.Part 3:Determination of hydroxyl number (English Version)

Standard No.: GB/T 12008.3-2009
Language: Chinese, Available in English version
Release Date: 2009
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 12008.3-2009
Replace: GB/T 12008.3-1989

Scope: 1.1 This part of GB/T 12008 specifies two methods for the determination of the hydroxyl value of polyether polyols. 1.2 Method A is the phthalic anhydride method, which is recommended for polyether polyols, polymer polyols and polyols with ammonia as the initiator. However, the results will be lower for polyols with steric effects. Other polyols can also be applied to this method if corrective measures can be taken. 1.3 Method B specifies the determination of hydroxyl value in polyether polyols by near-infrared spectroscopy. The steps for sample selection, data acquisition, and establishment and validation of calibration models are described.

GB/T 12008.3-2009 Referenced Document

ASTM D7253-06 Standard Test Method for Polyurethane Raw Materials: Determination of Acidity as Acid Number for Polyether Polyols*， 2024-04-19 Update
GB/T 2035-2008 Terms and definitions for plastics
GB/T 601-2002 Chemical reagent Preparations of standard volumetric solutions
GB/T 6682-2008 Water for analytical laboratory use.Specification and test methods

2009 GB/T 12008.3-2009 Plastic.Polyether polyols.Part 3:Determination of hydroxyl number
1989 GB/T 12008.3-1989 Palyether polyols--Determination of hydroxyl number