胶凝剂，具有良好的凝胶在100熔体强度至500℃，一）含有酸性磷酸铝，任选地在反应产物的形式以0.01〜4摩尔每磷酸铝的摩尔链烷醇胺的和b）硼酸的反应产物与链烷醇胺，并且因此 在a）和b），计算出的固体，在100的重量比：95〜100：0.5和存在于另外的碱金属化合物中的铝与1碱金属的摩尔比含有1.3〜2.5。 用于这种Gebildner的制备过程中，相应的防火凝胶，处理用于制备这类凝胶防火，含有这种防火凝胶防火眼镜，它们的生产和胶凝剂的各种其它可能的用途也被考虑。

Gelling agent, having good gel-melt stability at 100 to 500 ° C a) which contain acidic aluminum phosphates, optionally in the form of reaction products with 0.01 to 4 mol of alkanolamine per mole of aluminum phosphate and b) reaction products of boric acid with alkanolamines, and are characterized in that a) and b), calculated as solids, in a weight ratio of 100: 95 to 100: 0.5 and are present in addition alkali metal compounds in a molar ratio of aluminum to alkali metal of 1: contain 1.3 to 2.5. A process for the preparation of such Gebildner, corresponding Fireproofing gels, processes for preparing such Fireproofing gels, fire protection glasses containing such Fireproofing gels, their production and various other possible uses of the gelling agent are also contemplated.