Type NP pipe repair kit fixes joints, corrosion, leaks, and cracks in non-pressurized piping. Drinking water safe, the kit is NSF 61 approved for potable water systems. It can be used on up to 6-in. diam pipes. Neptune Research Inc.• Resistance Temperature to Heat - 300°F • Resistance Temperature to Cold- -50°F • ensile Strength - 38,000 psi • Lap Shear Strength - 900 psi • Flexural Strength1- 8,000 psi • Dielectric Strength1 - 6,000 volts