| http://www.w3.org/ns/prov#value | - A relatively high boron concentration is preferred since this enhances the glass forming effect on heating and reduces the total amount of boron compound which is added to the reaction composition.Examples of suitable boroesters are the trialkyl boroesters of formula B(OR)3, where R is a radical containing 1 to 18, preferably 1 to 8 carbon atoms, especially those which are colourless liquids.
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