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Ageing resistant fire protection medium - is based on water-contg. sodium silicate also contg. potassium and/or magnesium silicate content

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TLDR
In this paper, a pref. material is one in which 20-35% of the sodium silicate is replaced by potassium silicate, where the latter has a molar ratio (R) of K2O:SiO2 or 1:1 to 1:6, partic.
Abstract
In the compsn. 15-40% (wt.%) of the sodium silicate is replaced by potassium- or magnesium-silicate. The material pref. contains 20-50% (25-40%) water. A pref. material is one in which 20-35% of the sodium silicate is replaced by potassium silicate, esp. where the latter has a molar ratio (R) of K2O:SiO2 or 1:1 to 1:6, partic. 1:2 to 1:4. The compsn. pref. also contains the usual addns., e.g. wetting agents, foamants, dyes, pigments, reinforcement, esp. using 2-20% glass fibres. The material is pref. made by adding the K or Mg-silicate as solids or an aq. suspension, together with any addns., to an aq. suspension of the Na silicate. Used in the insulation and protection of openings and corridors against the ingress of fire and smoke in buildings, or as a fire protection glass.

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