LOCTITE SI 5970 Gasketing Product LOCTITE SI 5970 is a silicone sealant and cures on exposure to moisture in the air to form a tough rubber gasket. The product is designed primarily for flexible flange sealing. It is ideally used where high vibration or flexing occurs. It is tack-free after just 25 min. The product can be used on machined or cast surfaces, metal, plastic or painted parts. Application Typical applications include stamped sheet metal covers (timing covers and oil sumps) where good oil resistance and the ability to withstand high joint-movement is required. Characteristics Replacement for cork and paper cut gaskets on flanges and stamped sheet metal covers Can be used with plastic and painted parts Tack-free after 25 min. Ideal for use where high vibration or flexing occurs