Computer Modeling of Intumescent Penetration Seals

Penetrations in rated barriers require protection, or sealing, to prevent the passage of flame and smoke during a fire. In terms of the properties desirable for a penetration seal (high heat absorbing ability and strength after fire exposure), intumescent materials offer an excellent choice. This paper describes a simple three-dimensional heat transfer model for an intumescent penetrating seal exposed to a fire in accordance with that specified in the ASTM E814, Standard Test Method for Fire Tests of Through Penetration Fire Stops. The model is limited to estimating the temperature on the unexposed side as a result of heat transfer through the assembly. It makes no attempt at modeling flame passage or ability of the seal to withstand hose stream exposure. The model also assumes a very simplified hot gas emissivity model for heat transfer from the furnace to the assembly. Radiant view factors and emissivities are not calculated, but must be entered by the user. This model was validated by comparing predicted results with actual test data. Obtaining necessary physical property data for intumescent materials was found to be very difficult. Language: en