NIST Time|NIST Home|About NIST|Contact NIST

HomeAll Years:AuthorKeywordTitle2005-2010:AuthorKeywordTitle

Flammability of Oil-Based Painted Gypsum Wallboard Subjected to Fire Heat Fluxes.


pdf icon Flammability of Oil-Based Painted Gypsum Wallboard Subjected to Fire Heat Fluxes. (363 K)
Mowrer, F. W.

Fire and Materials, Vol. 28, No. 5, 355-385, 2004.

Sponsor:

National Institute of Standards and Technology, Gaithersburg, MD

Keywords:

wallborad; gypsum; flammability; oils; heat flux; cone calorimeter; fire models; flamd spread; paint

Abstract:

The flammability of painted gypsum wallboard (GWB) exposed to fire heat fluxes is investigated. GWB samples coated with multiple layers of alkyd/oil-based paint are subjected to constant incident heat fluxes of 35, 50 and 75 kW/m2 in the Cone Calorimeter for periods of 5, 10 and 15 min. A number of coats of alkyd/oil-based interior semi-gloss enamel paint, including 1, 2, 4, 6 and 8 coats, are applied over a single coat of oil-based primer to the exposed surface of 16 mm (5/8 in.) thick type X GWB. Unpainted type X GWB is also evaluated under the same exposure conditions. The potential for upward flame spread based on the Cone Calorimeter results is evaluated. The occurrence of paint blistering is observed to have a significant effect on the time to ignition and consequently on the potential for upward flame spread. Further work is needed to evaluate the conditions under which blistering will occur and its effects on the potential for surface flame spread on painted gypsum wallboard.