Patent ID: 9650288
Date: 2017-05-16
CPC Classifications: C03C

Claim:
1. A blue glass composition comprising a sodium-calcium-silicate base glass and a colorant, wherein said colorant consisting essentially of: total iron, expressed as Fe 2 O 3 from 0.30 to 0.60% by weight, with a ratio of ferrous (redox) in the range of 20 to 30%; FeO from 0.06 to 0.18% by weight; TiO 2 from 0.025 to 1.0% by weight; Co 3 O 4 from 5 to 30 ppm; Se from 0.1 to 10 ppm; and Cr 2 O 3 from 10 to 20 ppm, where the glass has a light transmittance illuminant “A” greater than 50%, a dominant wavelength (λ) from 487 nm to 498 nm; a solar energy transmittance less than or equal to 64.4%; ultraviolet solar energy transmittance of no more than 51.6%; and an excitation purity less than 12 for a glass thicknesses from 3 to 12 mm.