LOCTITE 638 is designed for the bonding of cylindrical fitting parts, particularly with narrow bond gaps approaching 0.25 mm. The product cures when confined in the absence of air between close-fitting metal surfaces and prevents loosening and leakage due to shock and vibration. It not only works on active metals but also on passive substrates, exhibiting robust cure performance. The product offers high-temperature performance and good oil tolerance, and tolerates minor surface contaminants. Prevents loosening: It fills all gaps between the cylindrical components and cures into a hard thermoset plastic. This unitizes the assembly and prevents loosening and leakage from shock and vibration. Works on all metal substrates. Tolerant towards minor surface contaminations. High temperature resistance. High strength on all metals, including passive substrates (e.g. stainless steel).3 Technical Information Agency Approvals / Specifications NSF P1 Reg No: 123010, DVGW (EN 751-1): NG-5146AR0619, WRAS (BS 6920): 0511518 Color Green Fixture Time 4.0 min. Gap Fill 0.15 – 0.25 mm Key Characteristics Strength: High Strength, Temperature Resistant, Oil Tolerant Operating Temperature -55.0 – 180.0 °C (-65.0 – 355.0 °F ) Shear Strength, Steel 31.0 N/mm² (4500.0 psi ) Substrates Metal: Steel Viscosity 2500.0 mPa·s (cP) Myth “is the bottle ONLY half full?”. Product Documentation: Click Here. Shop more products from Loctite: Click Here.
