ASTM E222 Standard Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation

EUROLAB laboratory provides testing and compliance services within the scope of ASTM E222 standard. These test methods cover the determination of hydroxyl groups attached to primary and secondary carbon atoms in aliphatic and alicyclic compounds and phenols.

Three test methods are given as follows:

• Test method A is recommended for general use;
• Test method B is included to give a standard procedure for the commonly used method;
• Test method C is recommended where results are required within a minimum time period or where ambient temperature is desired for the reaction.

Results using test methods A and B will be essentially the same, but results using test method C will be higher (up to about 4%, relatively) than those obtained using the other two methods.

Statements about precision are included with each test method. The precision of test methods A and C is consistent over a wide range of hydroxyl content (tested in the hydroxyl number range from 250 to 1600), whereas test method B is less sensitive at higher hydroxyl content than low hydroxyl content.

In general, test method A is about twice as sensitive as test method C. Test method B has approximately the same precision as test method C at a lower hydroxyl content level, but has poorer precision at a higher hydroxyl content level.

Values ​​stated in SI units should be accepted as standard. Values ​​in parentheses are for informational purposes only.

This standard does not purport to address all, if any, safety concerns associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory restrictions prior to use.

EUROLAB assists manufacturers with ASTM E222 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.