ASTM D2243 provides a procedure for evaluating the freeze-thaw resistance of waterborne coatings. The test was designed to simulate the effects of repeated freeze-thaw cycles on a coated surface, which is especially important in colder climates where coatings can be subject to extreme temperature swings.
Testing consists of subjecting the coated test panels to a specified number of freeze-thaw cycles during which the panels are exposed to the freeze-thaw cycles. The coated panels are then evaluated for signs of damage or degradation such as cracking, peeling or loss of adhesion.
ASTM D2243 provides guidance for sample preparation, selection of appropriate test conditions, and procedures for conducting freeze-thaw tests. The standard also includes guidance for interpreting test results.
During testing, the coated test panels were first allowed to dry or cure according to the manufacturer's instructions. The panels were then placed in the freezer and subjected to the indicated number of freeze-thaw cycles. Each cycle typically consists of exposing the panels to -18°C (-0.4°F) for a specified period of time, followed by thawing at room temperature for a specified period of time.
After completing the specified number of cycles, evaluate the coated panels for signs of damage or degradation. The degree of damage is usually rated based on a standardized rating system specified in the standard.
The freeze-thaw resistance of a coating is an important parameter affecting its durability and performance in cold climates. Coatings that cannot withstand repeated freeze-thaw cycles may crack, peel or lose adhesion easily, compromising their ability to protect the substrate.
In summary, ASTM D2243 provides a standardized procedure for evaluating the freeze-thaw resistance of waterborne coatings and can be an invaluable tool in evaluating the durability and performance of coatings in colder climates. By following the procedures outlined in the standard, users can obtain reliable and repeatable results that can be used to inform important decisions related to coating selection and quality control.
