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

Ceramics-Silikáty 34, (2) 143 - 152 (1990)


THE FACTORS INFLUENCING THE RESULTS OF CHEMICAL DURABILITY TESTS
 
Tošnerová Barbora, Sůvová Hana, Rybaříková Ludmila
 
Institute of Chemical Technology, Department of the Technology of Silicates, Suchbátarova 5, 166 28 Prague 6

Using two typu of chemical durability tests (static and dynamic teat in Soxhlet's extractor) at 95 °C, the resistance to water of two glasses (Float glass and a glass intended for the fixation of radiactive wastes) was determined while taking into account the following factors: a) the ratio of the sample surface area to the volume of the leaching solution (the so-called SA/V ratio); b) the form of the sample, by comparing ground and compact ones; c) various surface treatments of the samples (grinding and polishing). Their effect was established by determining the amount of alkalies and silica extracted into the solution. The effect of the SA/V ratio on the amount of components eluted into solution was found to depend on the composition of glass. The form of the sample does not substantially influence the teat results. The quality of surface finish affects the amount of components eluted into solution.


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