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Scope

1.1 This standard provides a standardized test method for determining the gelation and exotherm curve of unsaturated polyester and vinyl ester resins. This method provides guidance for measurement of the “Standard 180°F (82.2°C) Exotherm Curve” along with information on variances of the measurement which may be required for special resins. This test method provides information concerning the reactivity of unsaturated polyester and vinyl ester resins as they go through polymerization after mixing with the initiator.

Note 1—There is no known ISO equivalent to this standard, although ISO 584 is similar.

1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.

1.3 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.

Significance and Use

This test method is used to measure the reactivity of different lots of unsaturated polyester and vinyl ester resins. The information provided by this test can be used for assessing the predicted performance of a resin when used in elevated temperature as part of the process used to convert the resin into a finished product.

The method is used in research and development by companies that manufacture resins and for incoming quality control companies using these polymers as raw materials for production. The method is based on the methods which were previously outlined in the Handbook of Reinforced Plastics, “Procedure for Running Exotherm Curves Using the Block Test Method” published by the Society of the Plastics Industry.

Keywords

cure time; gel time; initiator; interval time; peak exotherm; resin; resin reactivity; SPI gel time; thermoset; unsaturated polyester; vinyl ester; Exothermic temperature analysis; Gelation; Reactivity; Thermosetting resins; ICS Number Code 71.080.70 (Esters)

To find similar documents by ASTM Volume:

08.03 (Plastics (III): D5117 - latest; Reinforced Plastic Piping Systems and Chemical Equipment; Plastic Building Products)

To find similar documents by classification:

71.080.70 (Esters)

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