Dispenser Acetone

Dispenser Acetone

Expert advice on anaerobic adhesives

Hello - my name is CS Woo and I work for Henkel Loctite specialized products ® for 22 years. I am the Technical Customer Services Manager for the Asia-Pacific and I am based in Shanghai regional office. I have worked offices in Japan and Korea Henkel to help customers in local markets.

I wonder about all the time anaerobic adhesives. I gathered the questions most frequently asked questions about the anaerobic technology and my answers in this article. I hope this is useful for you.

Q: What exactly is "anaerobic" in relation to adhesives?
A: Anaerobic adhesives are products that only remedy the absence of air. They are designed for metal-metal assemblies, but they can sometimes be used with other materials as well. The presence of metal ions accelerates the healing of these products. When you assemble the parts with these adhesives and you squeeze out more liquid, it will not harden due to exposure to air. Simply wipe away the excess with a solvent such as acetone common or isopropyl alcohol. Anaerobic adhesives are generally used for applications threadlocking, pipes leak, seals and retainers.

Q: What kind of equipment do I use anaerobic adhesives?
A: In general, they can be used effectively on metal surfaces. Some materials are more active than others and depending on the types of materials used, curing can be faster or slower.

Q: What is the difference between active and inactive?
A: The following table lists active and inactive materials:

Active -

• Brass
• Copper Bronze
• Manganese Iron
• Kovar
• Monel ®
• Nickel
• Steel

Inactive -

• Annodized aluminum
• Cadmium
• Chrome
• Gold
• Inconel
• Magnesium
• plated coins
• Galvanized steel
• Stainless Steel
• Titanium
• Aluminium
• Zinc
• Silver
• Black Oxide
• Magnetite

Q: How fast cure anaerobic adhesive?
A: Generally, it takes 24 hours to cure completely, but the pieces are usually fixed within 10 minutes depending on the quality of the adhesive. As they come in many different formulations, it is important to refer to data sheets for proper curing time.

Q: What is the pH of anaerobic materials?
A: PH is applicable only to materials that are soluble in water. Anaerobic adhesives are not and therefore have no value PH.

Q: If anaerobic adhesives cure in the absence of air, how come they do not cure in the bottle sealed?
A: The bottles are made out of specially formulated polyethylene oxygen-permeable, allowing air to pass through the wall of the bottle to keep the stability of the liquid inside. The bottle is not completely filled with adhesive so that the air in the bottle to ensure stability.

Q: Do you recommend using anaerobic adhesives on plastics?
A: This type of adhesive are not generally used with plastics, they will create tension cracks with some plastics, including many thermoplastics such as ABS and polycarbonate. If the adhesive is used for all metal-metal, but close to plastic, there is the possibility of excess liquid or steam that affect the plastic. In the case of plastics compatible as acetals, anaerobic adhesives are simply not the best family products to effectively lock and / or closure of these plastics. Instead Cyanoacrylates are often used if they meet other application settings.

Q: Can the cure time of anaerobic adhesives be accelerated by heat?
A: Yes, you can heat anaerobic adhesives cure to get the faster cure time. In general, you can heat these products cure at 250 ° F (121 ° C) for about an hour or 150 ° F (65 ° C) for about three hours. Trade is suddenly you will probably reduce your resistance to rupture. Each time you accelerate the crosslinking of the polymer, you can reduce its tensile strength. Test whether it is appropriate for your application.

Q: Do I need to use a primer with anaerobic adhesives?
A: I do recommend using a primer most anaerobic adhesives when applied to assemblies where both parties are classified as inactive metals. These metals have not the presence of iron content or copper and thus the absence of metal ions assets necessary to treat the product in full within 24 hours. If the other hand two or at least one party is an active metal such as carbon steel, brass, bronze, copper or iron, there is no need to use a primer to ensure a full recovery.

Q: anaerobic adhesives compatible with the rubber parts that they may be exposed in liquid prior to heal?
A: There is no long-term study for this type of adhesive and the compatibility with different elastomers. There is a general consensus that liquid anaerobic adhesive can harm certain elastomers in the form of swelling, cracking and weight change in case of prolonged contact. Customers should carefully test products for compatibility. Some distribution equipment designed Anaerobic adhesives for use Viton O-rings and seals because this material is considered compatible with them for a reasonable period time. Once the adhesive hardens anaerobic, there are no compatibility issues between hardware to all rubber and cure very inert anaerobic adhesive.

Q: Can anaerobic adhesives be used on parts impregnated with oil?
A: Yes. They can be used on parts impregnated with oil. Part wipe clean before applying the product. Select an anaerobic with a better action of cutting oil, which can heal, bond and seal effectively.

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