Effect of Mineral Fillers on the Heat Resistance and Combustibility of an Intumescent Fireproofing Formulation on Silicone Base

Abstract

An intumescent fireproofing formulation on silicone base, modified with mineral components (calcium carbonate, wollastonite, aluminosilicate microspheres), was studied by synchronous thermal analysis (Netzsch SТА 449 F5 Jupiter®). Introduction of 2–20 wt % wollastonite or aluminosilicate microspheres enhances the heat resistance (the ash residue increases by 27–40%) and reduces the combustibility of the modified fireproofing formulations (the total thermal effect of thermolysis of the fireproofing formulation decreases by a factor of more than 3). The optimum content of wollastonite and aluminosilicate microspheres is 5 wt %. Addition of calcium carbonate gave no complex positive effect.