Skip to Main Content
Charring rate of wood exposed to a constant heat fluxAuthor(s): R. H. White; H. C. Tran
Source: Wood and fire safety : 3rd International Scientific Conference: proceedings, May 6-9, 1996, The High Tatras, Slovak Republic. [Zvolen, Slovak Republic] : Technical University of Zvolen, Faculty of Wood Technology, 1996.:p. 175-183.
Publication Series: Miscellaneous Publication
PDF: Download Publication (118 KB)
DescriptionA critical factor in the fire endurance of a wood member is its rate of charring. Most available charring rate data have been obtained using the time-temperature curves of the standard fire resistance tests (ASTM E 119 and ISO 834) to define the fire exposure. The increased use of heat release calorimeters using exposures of constant heat flux levels has broadened the available database on wood charring. This paper presents such char rate data obtained with an Ohio State University (OSU) calorimeter. Results include char depth versus time models, char rates as function of other parameters, and temperature profiles in the remaining uncharred wood. Several investigators have measured charring rates for fixed heat fluxes. Butler (1971) reviewed such data and found charring rate to be directly proportional to the incident flux for the range of 20 to 3000 kW/m2. Nussbaum (1988) used a cone calorimeter to obtained charring rates for wood impregnated with low concentrations of fire retardants. Also with a cone calorimeter, Mikkola (1990, 1991) obtained charring rates for a variety of wood products at 50 kW/m2 and for spruce at fluxes of 25 to 75 kW/m2. Other charring data for specific constant heat fluxes have been reported by Fredlund (1988) and Cramer and White (1993).
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationWhite, R. H.; Tran, H. C. 1996. Charring rate of wood exposed to a constant heat flux. Wood and fire safety : 3rd International Scientific Conference: proceedings, May 6-9, 1996, The High Tatras, Slovak Republic. [Zvolen, Slovak Republic] : Technical University of Zvolen, Faculty of Wood Technology, 1996.:p. 175-183.
KeywordsCalorimeters, Calorimetry, Testing, Burning, Fire testing, Charring, Fire endurance, Pine, Basswood, Redwood, Red oak
- Ignitability analysis using the cone calorimeter and lift apparatus
- Correlation of smoke development in room tests with cone calorimeter data for wood products
- Burning rate of solid wood measured in a heat release rate calorimeter
XML: View XML