Do you recommend using anaerobic adhesives on plastics?

March 17th, 2010

Anaerobic adhesives are generally not used with most plastics. Anaerobic adhesives will stress crack some plastics, including many thermoplastics like ABS and polycarbonate. If the product is used for metal-to-metal but in close proximity to plastic, there is the possibility of excess liquid product or vapor affecting the plastic. In the case of compatible plastics like acetals, the anaerobic adhesives are simply not the best family of products for effectively locking and/or sealing. Often Loctite® Cyanoacrylates (Instant Adhesives) are substituted if they meet the other application parameters.

If anaerobic adhesives cure in the absence of air, how come they don’t cure in the sealed bottle?

March 17th, 2010

The bottles are specially formulated oxygen-permeable polyethylene that allows air to pass through the wall of the bottle to maintain stability of the liquid product inside. The bottle is not filled to the top for stability purposes. A Loctite® 50 ml liquid anaerobic adhesive is 50 ml’s of liquid product in a larger-capacity bottle.

How do you define anaerobic in relation to your products?

March 17th, 2010

Anaerobics – a term that includes many of our threadlockers, pipe sealants, retaining compounds and flange sealants – are products that cure in the absence of air. They are designed for metal-to-metal assemblies, although they are sometimes used for other materials. The presence of metal (ions) accelerates their cure. When you assemble parts with an anaerobic and you have excess squeeze-out (outside the joint), it will not harden, due to the anaerobic nature of the product. Simply wipe the excess away with a common solvent like acetone or isopropyl alcohol. Typically anaerobic adhesives fully cure in 24 hours at room temperature under normal ambient conditions when properly used.

What is the pH of anaerobic materials?

March 17th, 2010

PH can be measured if it contains water; as anaerobics are insoluble in water, they have no PH value.

How fast do anaerobic adhesives cure?

March 17th, 2010

Please refer to the Technical Data Sheets for detailed data. In general, it takes 24 hours to fully cure and fixture time of under 10 minutes, depending on grades.

What is the difference between active and inactive materials?

March 17th, 2010

Active and inactive materials are classified as followed:

Active
Brass
Copper Bronze
Manganese Iron
Kovar
Monel®
Nickel
Steel
Galvanized steel
Stainless steel
Titanium
Zinc
Aluminum
Silver
Black Oxide
Magnetite

Inactive
Annodize aluminum
Cadmium
Chrome
Gold
Inconel
Magnesium
Plated parts

On what kind of materials can I use anaerobic adhesives (threadlockers, thread sealants, retaining compounds and gasket eliminators)?

March 17th, 2010

Generally, anaerobic adhesives are recommended for use on metal surfaces. Some materials are more active than others, and depending on the types of materials used, the curing may be faster or slower.