ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 37, (4) 193 - 197 (1993)


REDUCTION OF LEAD LEACHING FROM LEAD CRYSTAL GLASS
 
Rybaříková Ludmila
 
Institute of Chemical Technology, Department of Glass and Ceramics, Technická 5, 166 28 Praha 6

The surfaces of lead crystal glass ware containing 24 wt.% PbO were dealkalized with products of decomposition of ammonium chloride at temperatures of 250 - 500 °C. The deposit formed on the glass surface was found to contain also lead, apart from potassium and sodium. The lead content was low compared to that of the alkalies. Tests of surface chemical durability with respect to water by the autoclave method as well as long-term surface leaching with acetic acid solution showed that dealkalization reduced considerably the leaching of alkalies as well as that of lead. The efficiency of the treatment increased with temperature, but even the glass surfaces dealkalized at the lowest temperatures, far below the Tg of the glass, exhibited a very satisfactory durability also on the long-term basis.


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