1.1 This standard describes three benchtop test methods for measuring the thermophysical responses of gypsum boards and panels when exposed to high temperatures. The test methods are: 1.1.1 High-Temperature Core Ccohesion-This test method evaluates the ability of the test specimen to withstand a specified mechanical strain while exposed to elevated temperature. 1.1.2 High-Temperature Shrinkage--This test method evaluates dimensional changes in the test specimen when exposed to elevated temperatures. 1.1.3 High-Temperature Thermal Insulation-This test method evaluates the rate of heat transfer through the thickness of the test specimen by measuring the length of time required to heat the center of the test specimen over a specified temperature rise when exposed to prescribed furnace conditions. 1.2 The test methods appear in the following order: high-temperature core cohesion--Section 4, high-temperature shrinkage--Section 5, and high-temperature thermal insulation--Section 6. 1.3 Units-The values stated in either inch-pound units or SI units (given in parenthesis) 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. 1.4 While these tests are useful for evaluating fire properties of gypsum boards and panels, they are not suitable for predicting Test Methods E119 fire-resistance performance of gypsum assemblies that have not previously been studied and correlated to these tests. 1.5 These test methods are used to measure and describe the response of materials, products, or assemblies to heat and flame under controlled conditions, but do not by themsleves incorporate all factors required for fire hazard or fire risk assessment of the materials, products, or assemblies under actual fire conditions.
The Gypsum Associations research program on Type X special fire-resistant gypsum board has documented the use of three small-scale bench tests to characterize the high-temperature thermophysical properties of gypsum-based products. This standard will specify the conditions and parameters for running these tests so that data from various laboratories can be compared and analyzed with confidence in the future. It is also intended that this standard will include other standardized test procedures for characterizing the fire response of gypsum as new methods are developed and validated.
Keywordsgypsum board; gypsum panel; fire resistance; high-temperature shrinkage; core cohesion; thermal transmission; high-temperature thermal insulation
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top