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Flammability of Painted Gypsum Wallboard Subjected to Fire Heat Fluxes.


pdf icon Flammability of Painted Gypsum Wallboard Subjected to Fire Heat Fluxes. (416 K)
McGraw, J. R., Jr.; Mowrer, F. W.

Volume 2;

Interscience Communications Ltd.; National Institute of Standards and Technology; Building Research Establishment; and Society of Fire Protection Engineers; Swedish National Testing and Research Institute. Interflam 1999. (Interflam '99). International Interflam Conference, 8th Proceedings. Volume 2. June 29-July 1, 1999, Edinburgh, Scotland, Interscience Communications Ltd., London, England, 1325-1330 pp, 1999.

Sponsor:

Society of Fire Protection Engineers, Boston, MA

Keywords:

fire science; fire safety; wallboard; gypsum; flammability; paints; heat flux; cone calorimeters; latex; sensitivity; flame spread

Abstract:

The flammability of painted gypsum wallboard (GWB) exposed to fire heat fluxes is investigated using the Cone Calorimeter. 16-mm (5/8-in.) thick Type-X GWB samples, painted with 2, 4, 6 or 8 coats of latex interior paint over a single coat of latex primer, are subjected to incident heat fluxes ranging from 25 to 75 kW/m for periods ranging from 5 to 15 minutes. A flame spread model developed by Quintiere and coworkers and previously applied by Mowrer and Williamson to thin finishes on GWB substrates is used to evaluate the potential for flame spread on painted GWB. The concept of a critical heat flux for flame spread is developed for thin combustible.