Just For Copper JFC050 1.85 Ounce Solderless Copper Bonding Ideal for installing and repairing rigid copper plumbing in potable hot and cold water systems and gas applications Can be used on all rigid copper and copper alloy pipes and copper and brass fittings up to 2.5 inches in diameter Will not conduct electricity , Tensile strength in excess of 1000 psi Holds 200 psi 7 minutes after bonding Holds 500 psi 4 hours after bonding