Abstract
AbstractUse of silica was emphasized since it is available in high purity, and since it is a major ingredient in all glass fibers. Other fillers employed include the aluminas, silicates, glass, and simple salts. When using a hydrocarbon type thermosetting resin and no chemical coupling agent, all fillers were substantially equivalent from the standpoint of strength of moldings. When using a vinyl silanol type coupling agent in the mix, there was a vast difference, however. Silica and alumina are strongly coupled via the silanol linkage of the silane, the glasses and complex silicates such as clays are intermediate, and simple salts such as carbonates and sulfates do not respond at all.
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