HEAT RESISTANT ILLUMINATING GLASS Russian patent published in 2008 - IPC C03C3/91 

FIELD: chemistry.

SUBSTANCE: invention relates to heat resistant glass, designed for making a wide range of illuminating construction, optical, aviation, space, aerodrome, chemical, metallurgical products. Glass contains the following, in wt %: SiO₂ 70.0-76.0; Al₂O₃ 3.0-4.0; B₂O₃ 9.0-11.0; Na₂O 4.5-6.0; K₂O 1.5-2.0; CaO 2.0-3.0; BaO 3.5-4.5; CeO₂ 0.1-0.5; F^- 0.1-0.6. The glass is boiled at temperature of 1530-1550°C. Working point is 1300-1450°C and crystallising temperature is 800-1050°C. The obtained glass is characterised 88.5-92% light transmission, and 110-120°C heat resistance.

EFFECT: increased light transmission in visible spectrum, increased heat resistance and lower temperature coefficient of linear expansion.

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