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How to Apply Gasketing Adhesives
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- Apply an appropriate LOCTITE cleaner on old gasketing adhesive and use a wood or plastic scraper to remove residues. Remove burrs.
- It is recommended to use an appropriate LOCTITE cleaner to degrease and clean surfaces prior to applying the adhesive.
- If cure speed of is too slow due to passive metals or low temperature (below 5°C), use a LOCTITE activator such as LOCTITE 7471 MIL-SPEC Primer or LOCTITE 7649 MIL-SPEC Primer.
- Apply as a continuous closed bead onto one flange surface. Place the bead close to the inner rim of the flange and encircle all bolt holes. Small scratches can be filled by the adhesive.
- The gasket sealant can also be applied by roller onto large flanges.
- Recommended dispensing equipment: Manual Dispensers.
- Assemble flanges and tighten bolts as soon as possible to prevent shimming.
- Disassemble bolts with standard hand tools.
- Use jacking-screws, cast-on bosses or recesses to lift flanges apart.
The major causes of failure and leakage of compression gaskets are:
- Surface Contact: Compression gaskets do not provide total contact between the gasket and the flange surfaces. Therefore minor leakages may always occur (weeping rate)
- Compression Set: Compression gaskets relax under dynamic loads and decrease in thickness, with subsequent loss of bolt tension in the flange joint resulting in leakage
- Displacement: Gaskets can be squeezed out between flanges
- Bolt Hole Distortion: High stresses are transferred to the gasket material under the bolt head, causing the gasket to crack, tear, rupture or extrude