(under subclass 428) Product in which the second layer comprises (1) a compound similar to a hydrocarbon in which the tetravalent silicon replaces the carbon atom, as SiH4n monosilane or silicomethane, (2) an elastomeric in which the carbon linkages of a polymerized hydrocarbon are replaced by Si-O linkages or (3) any of a class of compounds that contain alternate silicon and oxygen atoms in either a linear structure (such as H3Si (O Si H2[end subscrpt])n O Si H3) or a cyclic structure as H2(Si O)n and that may also contain methyl, phenyl or other organic radicals in place of some or all of the hydrogen atoms and are made by hydrolyses of chlorosilanes or alkoxy-silanes.
