ASTM D4274-23
Standard Test Methods for Testing Polyurethane Raw Materials: Determination of Hydroxyl Numbers of Polyols

Standard No.

ASTM D4274-23

Release Date

2023

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D4274-23

Scope

1.1 These test methods measure the hydroxyl groups in polyester and polyether polyols containing primary and secondary hydroxyl groups. They also apply to many other hydroxyl-containing substances. 1.1.1 Test Method A—Acetic Anhydride Pressure Bottle, recommended for polyesters. 1.1.2 Test Method B—Phthalic Anhydride Pressure Bottle, recommended for polyethers and polyesters. 1.1.3 Test Method C—Phthalic Anhydride Reflux, recommended for polyethers and polyesters. 1.1.4 Test Method D—Imidazole–Catalyzed Phthalic Anhydride Pressure Bottle, recommended for polyethers, polyesters, polymer polyols, and amine-initiated polyols. 1.1.5 Test Method E—Imidazole-Catalyzed Pyromellitic Dianhydride Esterification, recommended for polyols used for flexible and rigid polyurethane foams and urethane elastomers. It is recommended for polyester polyols, polyether polyols, amine-started polyols, and polymer polyols (polyacrylonitrile/ copolystyrene-based). 1.2 Another ASTM test method for measuring hydroxyl groups is Test Method E222. 1.3 The values stated in SI units are to be regarded as the standard. 1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. NOTE 1—This standard, ISO 14900 and ISO 6796 address the same subject matter, but differ in technical content. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM D4274-23 Referenced Document

• ASTM D1193 Standard Specification for Reagent Water
• ASTM D883 Standard Terminology Relating to Plastics*， 2024-02-01 Update
• ASTM E180 Standard Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals
• ASTM E200 Standard Practice for Preparation, Standardization, and Storage of Standard and Reagent Solutions for Chemical Analysis
• ASTM E203 Standard Test Method for Water Using Volumetric Karl Fischer Titration
• ASTM E222 Standard Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation*， 2023-04-01 Update
• ASTM E2935 Standard Practice for Evaluating Equivalence of Two Testing Processes
• ASTM E456 Standard Terminology for Relating to Quality and Statistics
• ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
• ISO 14900 Plastics*， 2023-12-01 Update
• ISO 6796 Polyglycols for industrial use; Determination of hydroxyl number; Phthalic anhydride esterification method

ASTM D4274-23 history

• 2023 ASTM D4274-23 Standard Test Methods for Testing Polyurethane Raw Materials: Determination of Hydroxyl Numbers of Polyols
• 2021 ASTM D4274-21 Standard Test Methods for Testing Polyurethane Raw Materials: Determination of Hydroxyl Numbers of Polyols
• 2016 ASTM D4274-16 Standard Test Methods for Testing Polyurethane Raw Materials: Determination of Hydroxyl Numbers of Polyols
• 2011 ASTM D4274-11 Standard Test Methods for Testing Polyurethane Raw Materials: Determination of Hydroxyl Numbers of Polyols
• 2005 ASTM D4274-05 Standard Test Methods for Testing Polyurethane Raw Materials: Determination of Hydroxyl Numbers of Polyols
• 1999 ASTM D4274-99 Standard Test Methods for Testing Polyurethane Raw Materials Determination of Hydroxyl Numbers of Polyols