Loctite
Loctite 640804 High Tack Gasket Sealant 19 g Purple
Anaerobic gasket sealant cures in one day, holds from −65 °F to 300 °F and works with fuels, water and automotive fluids
- Anaerobic cure locks joints in 5 minutes
- Solvent-free semisolid applies cleanly from 19 g stick
- Withstands -65 °F to 300 °F for engine use
- Resists acetone, fuels, ethanol and water
- Series 534 formulation seals cork and similar materials
High-Tack Gasket Sealant Stick
Loctite 640804 is a solvent-free semisolid gasket sealant supplied in a 19 g purple stick. It is designed for mechanics and technicians who need a clean, controlled application on cork gaskets without liquid drips.
Anaerobic Cure Up to 300 °F
The anaerobic formulation cures fully in one day at room temperature with a five-minute working window. It remains stable across a continuous operating range from -65 °F to 300 °F and resists automotive fluids, fuels, ethanol, acetone and water.
Stick Format Simplifies Assembly
The solid stick form eliminates the mess of paste tubes and allows precise placement on gasket surfaces. No separate applicator or mixing step is required, reducing preparation time during reassembly of flanged joints.
Highlights
- Anaerobic cure locks joints in 5 minutes
- Solvent-free semisolid applies cleanly from 19 g stick
- Withstands -65 °F to 300 °F for engine use
- Resists acetone, fuels, ethanol and water
- Series 534 formulation seals cork and similar materials
Specifications
| Brand | LOCTITE |
|---|
Questions about this item
How is the 19 g purple stick applied and what step do installers often skip?
Clean both surfaces, twist the stick to expose fresh material, coat each flange evenly, assemble within the 5 min working window, then let the anaerobic cure develop for 1 day before pressurising.
What maintenance or replacement will the cured gasket need later?
The sealant remains a flexible solid across the -65 °F to 300 °F range and resists acetone, ethanol, fuels and water, so the joint only needs replacement if the flange is disassembled or damaged.
What limit appears first during sustained high-temperature operation?
Continuous exposure above 300 °F exceeds the maximum operating temperature and will degrade the anaerobic bond before any other property fails.
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