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New examinations of a predictive model for the IS0 9705 room-comer test have been made for a series of materials. The materials include many that melt and deform during combustion, and thus do not remain intact as wall and ceiling surfaces. Since the model cannot address these effects directly, the melting materials are represented by an adjustment to the total energy available per unit area. This effectively reduces the overall bum time to account for the material falling to the floor. Predictions for melting materials indicate that a significant reduction in the total available energy can provide reasonable fire growth predictions. Examples of materials that remain in place during combustion are also presented and appear to be predicted well by the model. An empirical correlation based on upward flame spread was also applied and indicates a direct relationship between the time to flashover and the heat release rate, times to ignition, and time to burnout.