1. Scope

1.1 This test method covers the determination of hydroxyl groups attached to primary and secondary carbon atoms in aliphatic and cyclic compounds and phenols. It is not suitable for determination of hydroxyl groups attached to tertiary carbon atoms. This test method is applicable to polyacetals, temperature sensitive materials, high solids polymer polyols, and rigid polyols. Other availalbe test methods listed in Note 1 are not suitable for many of the sample types listed above.

1.1.1 This test method is currently recommended for neutral refined products. Successful application has been made, however, to some in-process samples that contain an excess of acidic species. Proper validation must be performed, of course, to show that the acidic species either does not interfere, or that the acidic species interference has been obviated.

Note 1--Other methods for determination of hydroxyl groups are given in test Methods D817, D871, D1957, D2195, D4252, D4273, D4274, E222, E326, and E335.

1.2 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 standrd to establish appropriate safety and health practices an determine the applicability of regulatory limitaitons prior to use.

1.3 Revew the current appropriate Material Safety Data Sheets (MSDS) for detailed informaiton concerning toxicity, first aid procedures, and safety precautions.

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

D817 Test Methods of Testing Cellulose Acetate Propionate and Cellulose Acetate Butyrate

D871 Test Methods of Testing Cellulose Acetate

D1193 Specification for Reagent Water

D1957 Test Method for Hydroxyl Value of Fatty Oils and Acids

D2195 Test Methods for Pentaerythritol

D4252 Test Methods for Chemical Analysis of Alcohol Ethoxylates and Alkylphenol Ethoxylates

D4273 Test Method for Polyurethane Raw Materials: Determination of Primary Hydroxyl Content of Polyether Polyols

D4274 Test Methods for Testing Polyurethane Raw Materials: Determination of Hydroxyl Numbers of Polyols

E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals

E222 Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation

E300 Practice for Sampling Industrial Chemicals

E326 Test Method for Hydroxyl Groups by Phthalic Anhydride Esterification (Discontinued 2001)

E335 Test Method for Hydroxyl Groups by Pyromellitic Dianhydride Esterification

Keywords

hydroxyl number; p-Toluenesulfonyl isocyanate; polyacetals; polyols; potentiometric titration; tetrabutylammonium hydroxide; Hydroxyl groups; Potentiometric titration; Tetrabutylammonium hydroxide; p -Toluenesulfonyl isocyanate (TSI);

ICS Code

ICS Number Code 71.040.40 (Chemical analysis)

DOI: 10.1520/E1899-97

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