Tantalum Spring is made of tantaloy "61" metal wire, NRC91 or 10% tungsten, 90% tantalum alloy. (or 7.5% tungsten, 90% Ta) Tantaloy ... Spring is made of tantaloy "61" metal wire, NRC91 or 10% tungsten, 90% tantalum alloy, which can provide a lifetime warranteed main ... , heat exchangers, condensers, reaction vessels, leaf springs and bellows. Tantalum alloy wire Spring For Gas Chlorinators