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

ASTM-D4274 - 1983 EDITION - SUPERSEDED
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Standard Test Methods for Testing Polyurethane Raw Materials: Determination of Hydroxyl Numbers of Polyols
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Scope

1.1 These test methods measure the hydroxyl groups in polyester and polyether polyols. 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 Other ASTM test methods for measuring hydroxyl groups are Test Methods D1957, E222, E326, and E335 (see Note 1).

Note 1-Test Method C is essentially similar to ISO 6796-1981, but there are some differences in the concentrations used and some procedural details. There are currently no data available for comparing the results of Test Method C to those of ISO 6796-1981.

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.

Keywords

acetic anhydride; esterification; hydroxyl number; phthalic anhydride; polyester; polyether; polyol; pyromellitic dianhydride; titration; ICS Number Code 83.080.20 (Thermoplastic materials)

To find similar documents by ASTM Volume:

08.02 (Plastics (II): D3222 - D5083)

To find similar documents by classification:

83.080.20 (Thermoplastic materials)

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Document Number

ASTM-D4274-83

Revision Level

1983 EDITION

Status

Superseded

Modification Type

New

Publication Date

July 29, 1983

Document Type

Test Method

Page Count

9 pages

Committee Number

D20.22