ASTM C1860-22 PDF Download

The ASTM C1860-22 standard provides procedures for determining the tensile strength and bond strength of portland cement-based plaster. The test methods outlined in this standard are destructive in nature within the localized test areas and require appropriate repair of the finish system and any underlying materials damaged during testing.

These test methods are suitable for use on both new and existing construction and should be conducted a minimum of 28 days after the application of the portland cement-based plaster. The standard specifies two test methods: Mechanical Load Test Method A and Vacuum Chamber Testing, which are used to determine the tensile strength or bond strength of direct-applied portland cement-based plaster, as well as Mechanical Load Test Method B and Vacuum Chamber Testing, which are used to determine the tensile strength of portland cement-based plaster installed over mechanically attached lath.

It is important to note that there should be no correlation made between laboratory and field testing. Additionally, the test methods are not intended to evaluate the performance of the underlying construction or framing members, and the results may vary depending on specimen location, condition, and installation. The standard also states that it is not intended to evaluate the performance of coatings applied to the surface of the portland cement-based plaster.