A spin-on glass composition includes a solvent, about 3 to about 20 percent by weight of a porogen, and about 3 to about 20 percent by weight of a silsesquioxane oligomer represented by formula (1), ##STR00001## where, in the formula (1), Y.sub.1 and Y.sub.2 independently represent a hydrolyzable alkoxy group, R represents a lower alkyl group, and n and m independently represent an integer in a range of one to nine both inclusive.

 
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