Significance and Use
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 DImidazole–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 and health practices and determine the applicability of regulatory limitations prior to use.
Note 1—This standard and ISO 6796 address the same subject matter, but differ in technical content.
2. Referenced Documents (purchase separately) 
The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
D883 Terminology Relating to Plastics
D1193 Specification for Reagent Water
E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals
E200 Practice for Preparation, Standardization, and Storage of Standard and Reagent Solutions for Chemical Analysis
E203 Test Method for Water Using Volumetric Karl Fischer Titration
E222 Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ISO Standard
Keywords
acetic anhydride; esterification; hydroxyl number; phthalic anhydride; polyester; polyether; polyol; pyromellitic dianhydride; titration; Hydroxyl numbers; Polyether polyols; Polyols; Polyurethane insulation; Polyurethane raw materials--polyols;
ICS Code
ICS Number Code 83.080.20 (Thermoplastic materials)
DOI: 10.1520/D4274-11
ASTM International is a member of CrossRef.
Citing ASTM Standards
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