... to its good fatigue strength, forming and spring properties.Typical Application for C64700/C70250 Nickel Silicon Bronze Alloys:Electrical : Resistance ... : BalanceNote: Copper plus additions equal 99.50% minimum.Typical Physical Properties:Specific Gravity: 8.80-8.90 g/ ... the units are based upon US Customary.2). the typical physical properties apply to age hardened products.International Specification: ...