Flame-retarding sealing compounds

A flame-retarding sealing compound consisting essentially of

• (a) 10 to 50 weight % of a hydraulic binder selected from the group consisting of alpha-gypsum, beta-gypsum, plaster of Paris, plastering gypsum and anhydrite,
• (b) 20 to 60 weight % of a dehydratable filler selected from the group consisting of aluminium hydroxides, aluminium hydrated oxides and hydrated aluminas,
• (c) 10 to 60 weight % of a melamine selected form the group consisting of 2,4,6-triamino-s-triazine and salts of 2,4,6-triamino-s-triazine, said melamine being such that upon thermal decomposition said melamine simultaneously gives off basic gases which are capable of bonding hydrogen halides, said melamine being such that said melamine consumes energy during thermal decomposition and said melamine being capable of melting, subliming and decomposing under thermal decomposition,
• (d) 3 to 30% by weight of a polymer dispersion having a film forming temperature between -15.degree. C. and +40.degree. C. and
• (e) optionally a pigment or an inorganic phosphorous-containing compound as a phosphoric acid donor in an amount of 5 to 35% by weight.