| 摘要 |
Transparent fire-resistant glazing units according to the invention comprise at least one intumescent layer of hydrated alkali metal silicate between two sheets of glass. The intumescent layer of alkali metal silicate has an SiO2/M2O molar ratio between 3.5 and 7 and a water content of 33% to 43% by weight. Their preparation incorporates a drying step.
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