Ceramics-Silikáty 51, (3) 131 - 135 (2007)

In submitted paper the kinetic of E-glass fibers leaching in distilled water was studied. Time dependences of the total amount of elements (Si, B, Al, Ca and Mg) leached from glass fiber at temperatures 50°C, 70°C and 90°C into solution were determined under static conditions. The ratio of initial surface area of leached glass fibers and volume of corrosion solution S/V reached 3500 m⁻¹. The time dependencies of concentration of leached elements were described in accordance with Helebrant's model corrected for an amount of elements carried into solution by the technical fiber in zero time. The kinetic of glass dissolution was described based on the amount of leached boron. Mean composition of oxides presented in precipitated layer and surface diffusion layer have been calculated provided that boron is not presented in that layer. Dependence of glass dissolution from solution composition and temperature was determined by statistical methods. The value of activation energy (46 ± 4) kJ/mol has been found.