| 摘要 |
<p>PURPOSE:To provide a fireproof glass plate having excellent light transmittability and fireproof function without causing clouding for a long period of time by providing an intermediate layer of sodium silicate wherein the molar ratio of SiO2/Na2O is in a specific range between plural glass plates. CONSTITUTION:Preferably 7-20wt% glycerol is added to sodium silicate of 3.7- 3.9 molar ratio of SiO2/Na2O, and the mixture is coated on the top surface of a glass plate and is dried, whereby a transparent water glass film of 20-35wt% moisture content is formed. Thereafter, plural sheets of glass plates are sandwiched in such a way that the resultant water glass film is located on the inner side, whereby the intended fireproof glass plate is obtained. The resultant fireproof glass plate does not cause clouding by penetration of the components of the glass in contact with the sodium silicate layer into the sodium silicate, and maintains superior light transmittability for a long period of time.</p> |
