Patent ID: 8206620

Claim:
A meltable and pourable composition for forming a fire resistant window pane which comprises; a) about 10 to 40% by weight of Tris (hydroxymethyl) aminomethane; b) about 10 to 30% by weight of a member selected from the group consisting of, ammonium dibasic phosphate, ammonium phosphate and their hydrates and phosphoric acid; c) about 35 to 65% by weight of a member selected from the group consisting of sodium tetraborate decahydrate, sodium borate, potassium borate; lithium borate; boric acid, alkali metal borates and their hydrates, ammonium borate, and boric anhydride; d) about 0 to 25% by weight of a member selected from the group consisting of sodium phosphate, sodium and potassium dihydrogen phosphate, sodium and potassium monobasic phosphate and their hydrates, and lithium dihydrogen phosphate, and e) about 10 to 30% by weight water.