Glass composition suitable for use in a fluorescent lamp, lamp envelope manufactured from said glass composition and fluorescent lamp provided with a lamp envelope of said glass composition

摘要

A novel type of glass having a low sodium content (<0.1 wt. % Na2O), which can be used as a bulb glass (10) for "TL" lamps and for compact fluorescent lamps. Said glass is free of the toxic and/or corrosive components PbO, F, As203 and Sb203. Apart from favorable properties as regards phosphor poisoning and mercury absorption, resulting in a favorable maintenance of the lamp, said glass is characterized by a wide working range W.R. (=Twork-Tsoft), so that glass tubing can be readily made of said glass. By virtue of the low liquidus temperature (Tliq), the glass can be drawn into glass tubing which is free of crystals.