Influence Of Phosphorus, Barium, And Lead Compositional Variation On The Chemical Durability Of A Multicomponent Glass System

Glasses were prepared by systematic additions of P205, Ba0, and Pb0 to glasses consisting of Al203-B203-(Ba0)-Ca0-Fe203-K20-Mg0-Na20-(Pb0)-P205)-Si02, and their chemical durability was examined by the EPA TCLP test. The addition of about 1 mol% P205 to a glass containing 5 mol% Pb0 increases the normalized lead leaching rate (NLLR) by about 40 relative%, but increasing P205 to 2 mol% decreases the NLLR to about the NLLR obtained without P205. A similar, but more dramatic behaviour with changes in the NLLR of about 300 relative% is obtained by sequential combined additions of 1 mol% each of P205 and BaO to a glass containing 1 mol% PbO.