A coating and/or moulding composition for preparing articles exhibiting heat-, fire- and corrosion- barrier properties comprises (a) a water-insoluble particulate inorganic material, preferably a layer mineral, (b) a water-solubilised inorganic binder, preferably a phosphate, (c) an aqueous medium, and (d) optionally an organic polymer, preferably a water-insoluble polymer, components (a) and (b) being respectively at least 10% and at least 20% by weight of the combined weight of (a) and (b) and the combined weight of (a) and (b) being at least 70% by weight of the total weight of (a), (b) and (d).
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