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New Flame Retardants Consortium: Flame Retardant Mechanism of Silica. Final Report.


pdf icon New Flame Retardants Consortium: Flame Retardant Mechanism of Silica. Final Report. (2147 K)
Gilman, J. W.; Kashiwagi, T.; Nyden, M. R.; Harris, R. H., Jr.

NISTIR 6357; 28 p. June 1999.

Available from:

National Technical Information Service (NTIS), Technology Administration, U.S. Department of Commerce, Springfield, VA 22161.
Telephone: 1-800-553-6847 or 703-605-6000;
Fax: 703-605-6900.
Website: http://www.ntis.gov
Order number: PB99-144370

Keywords:

flame retardants; fire retardants; silica

Abstract:

The results of a two year research project carried out with the "New Flame Retardants Consortium" are reported. This investigation into the flame retardant mechanism of silica gel and other forms of silica has determined that the silica FR mechanism is comprised of two main effects. The first is a reduction in the transport rate of the thermal degradation products by dramatically increasing the viscosity of the polymer melt due to hydrogen bonding of surface silanol groups and entanglement of polymer chains within the large pores of silica gel. Second is the reduction in thermal diffusivity of the sample near the surface due to gradual accumulation of silica, which acts as a thermal insulation layer.