increased stability of derivitization agents on the surfaces of packing material used in choromatography is described . in particular , the stability of the organosilanes on silicia surfaces used in chromatography is increased , thereby creating a more durable coating of organosilanes . by increasing its stability , the organosilane entity becomes more resistant to de - bonding and the durability of the underlying surface is enhanced against dissolution . thus , chromatographic separations are able to be performed at higher and lower ph ranges and higher temperatures . the stability can be increased through attachment of polydentate silanes which are either prepolymerized and then surface bonded or can be bonded first and then cross - polymerized afterward , yielding a polymerized polycarbosilane backbone that is very stable against hydrolytic cleavage conditions .