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Henkel Adhesive Technologies

Henkel Adhesive Technologies

Anaerobic adhesives

Aneorobics don’t have solvents in them that need to ‘dry.’ In fact, for an aneorobic to cure, the adhesive must make contact with active metal ions in the absence of oxygen.

The ‘ml’ specification on each adhesive package is the amount that is in the bottle. The bottles are only filled half-way because the air actually keeps them from curing.

They prevent fastener loosening and corrosion. These products also seal the joint.

 To prevent leakage of liquids or gases from pipe joints.

They bond cylindrical metal assemblies together. They can be used on their own or to augment traditional assemblies and can allow for less accurate machining which can lower costs.

No solvent will wick into the joint to break the threadlocker down. This is either hand tool removable at room temperature or if not, it requires high temperatures of 450-600°F to separate parts. These products are thermoset plastics in the cured state that soften at higher temperatures. Thus, you need to disassemble while at the higher softening point temperature. The material does weaken when exposed to heat but it regains its strength when it cools back to room temperature unless those temperatures have started to burn the threadlocker. At 450-600°F, the threadlocker will get burned. The resistance the product once burned will be the resistance of charred/burnt plastic which is why it is best to disassemble while everything is still hot. Solvents like methyl ethyl keytone and methylene chloride can be used for clean up of residue only after disassembly.

We recommend the use of primers such as SF 7649 & SF 7471 with most anaerobics where both parts are classified as "inactive" metals. These metals lack the presence of iron or copper content and thus, lack the "active" metal ions required to fully cure the product in 24 hours. These metals include plated parts, stainless steel, galvanized steel and anodized aluminum, to name a few. If, on the other hand, both or at least one part is an "active" metal, such as plain steel, brass, bronze, copper or iron, there is no need to use a primer to ensure full cure in what is typically 24 hours at room temperature. A primer will be helpful to accelerate the cure in colder temperatures or where there are larger gaps between the metal components.

Yes. Anaerobics can be used on oil-impregnated parts. Just wipe the part clean prior to applying the product. The more oil tolerant products like 638 & 243 are good choices because they have better ability to cut through the oil to cure properly and bond and seal effectively once hardened.

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