Abstract
position SiO2 - 54.2%, AlzO3 - 14.0%, CaO 19.8%, MgO - 2.2%, B203 - 8.2%, Fe203 - 30.3%, and Na20 + K20 - 0.56% (wt %) was used. The fabric was 0.04 cm thick and was made of fibres of 10~m diameter. This material was leached in 2 N and 4N HC1 at 100°C for 6, 4, 1 and 0.5h to remove all the ions including alkali ions. The percentage of removal with time and concentration are given elsewhere [5]. The stainless steel jigs (1") used were kept in a porous mica insulation brick. The samples were spring loaded and kept in a nichrome wire wound furnace. E-glass and
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