- Author
- Houser, J. L.
- Title
- Development of a Bench Test for Type X Core Gypsum Board. Final Report.
- Coporate
- National Bureau of Standards, Gaithersburg, MD
- Report
- NBSIR 74-588, December 1974, 22 p.
- Distribution
- Available from National Technical Information Service
- Keywords
- building codes | construction materials | fire endurance rating | fire tests | gypsum
- Abstract
- This paper describes the development of a test method for determining that the core material in a gypsum board sample qualifies as type X. A 2 inch (5.08 cm) by 16 inch (40.64 cm) specimen is flexurally stressed during the test by suspending a weight from the cantilevered end of the test sample. The specimen is swiveled into the center of a two burner turbulent flame at an average temperature of 1,780 deg. F (971 deg. C). The burners are positioned from above and below. The test is terminated when the specimen either breaks or deflects through an arc three times the specimen thickness. Results show this method to be repeatable with a coefficient of variation equal to ± 8 percent for a given type of material from a single manufacturer.