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Melt flow and dripping of polymeric materials can be both beneficial and detrimental during fire. In the vertical UL 94 test, a well adjusted dripping behaviour of flame retarded polypropylene (PP-FR) resulted in a non-flaming dripping V-0 classification. Melt flow and dripping reduce flame spread and even result in extinction, as mass and heat are removed from the actual pyrolysis zone. For the polymer samples and their drops collected in UL 94, the decomposition and viscosity was investigated. Particle finite element method (PFEM) was successfully used to simulate the material behaviour in the UL 94 test. The competition between gasification, combustion and melt dripping is evaluated.