?EFFECT OF AL203 AND B203 ON SELENIUM RUBY GLASSES FOR RED SIGNALS
Keywords:
Selenium glass, Ruby glass, Red signal glass.Abstract
This paper presents the results of some investigations on the melting of selenium ruby glasses, particularly on the effect
or AI20j and I3p) on ruby colour. /\ glass of base composition (wt. %) Si02 65.0, Nap l5.5,Kp 5.3, ZnO l2.0, H201
1.0. CdS 0.6, Sc 0.6 has been chosen for these studies. To this glass Alp) and Bpj arc systematically substituted for
Na20 in small amounts from 0.5 to 3.0%. Effects of these substitutions on melting, refining, colour, striking temperature
etc. have been recorded. Transmittance of some representative samples has been determined. Glasses containing AI20] 1.5
and 2'.0% and having Bp) 2.0 to 3.0% alongwith 1.0% Al20l have been found suitable for the development of red signal
glasses. Pilot Plant meltings also gave satisfactory results.
