ASTM D4274-23

ASTM D4274-23 - 15.3.2023

Significance and Use

5.1?These test methods are suitable for research and as quality control and specification tests. It is necessary to know the hydroxyl contents of polyols in order to formulate polyurethane systems.

1. 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 AAcetic Anhydride Pressure Bottle, recommended for polyesters.

1.1.2?Test Method BPhthalic Anhydride Pressure Bottle, recommended for polyethers and polyesters.

1.1.3?Test Method CPhthalic Anhydride Reflux, recommended for polyethers and polyesters.

1.1.4?Test Method DImidazoleCatalyzed Phthalic Anhydride Pressure Bottle, recommended for polyethers, polyesters, polymer polyols, and amine-initiated polyols.

1.1.5?Test Method EImidazole-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.

2. Referenced Documents

E180-03	Standard Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals (Withdrawn 2009)
D1193-06(2018)	Standard Specification for Reagent Water
E200-23	Standard Practice for Preparation, Standardization, and Storage of Standard and Reagent Solutions for Chemical Analysis
E203-24	Standard Test Method for Water Using Volumetric Karl Fischer Titration
E222-23	Standard Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation
D883-24	Standard Terminology Relating to Plastics
E691-23	Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ISO14900	PlasticsPolyols for Use in the Production of PolyurethaneDetermination of Hydroxyl Number
ISO6796	Polyglycols for Industrial UseDetermination of Hydroxyl NumberPhthalic Anhydride Esterification Method