B518 Flexible Gasket Sealant

The Bondloc B518 Flexible Gasket Sealant is a red, smooth paste designed for creating durable, flexible gaskets on engines and machinery. This modified urethane acrylate sealant cures when confined between parts to form a tough, flexible seal in place, offering an instant low-pressure seal ideal for demanding automotive and mechanical applications. The thick paste formulation applies easily and is particularly effective for fuel and water pumps, split crankcase assemblies, gearbox covers, and engine timing cam covers. It's also suitable for air compressor end caps, engine thermostats, pump couplings, and fuel tanks on smaller equipment including chainsaws and lawn mowers. This gasket sealant excels at dressing existing gaskets and spacers, providing enhanced sealing performance across a wide temperature range from -55°C to +150°C. With a fixture time of up to 12 hours without activator (or under 2 hours with activator), the B518 offers flexibility in assembly timing whilst delivering reliable long-term performance. The 0.5mm gap fill capability and high viscosity ensure effective sealing on irregular or slightly damaged surfaces.

Features and Benefits:

• Forms tough, flexible gaskets in place for reliable long-term sealing
• Instant low-pressure seal for quick assembly work
• Operates reliably across temperatures from -55°C to +150°C
• High viscosity paste fills gaps up to 0.5mm for irregular surfaces
• Compatible with fuels, water, and oils in automotive applications

Specifications: Gasket Type: Gasket Sealant Size (ml): 50 Resin: Modified Urethane Acrylate. Colour: Red Paste. Fixture Speed No Activator: Up to 12 hours. Fixture Speed With Activator: <2 hours. Viscosity: >3,500,000 cps. Gap fill: 0.5 mm. Flash point: >100°C. Shelf life: 12 months @ 20°C. Specific gravity: 1.13. Max operating temp: -55°C to +150°C. Cured Performance: Full Cure Time: 12 hours. Tensile strength: 8 N/mm(2). Static Shear strength: 12.5 N/mm(2).