Hydraulic sealing adhesive for hydraulic systems/hydraulic blocks
Hydraulic Sealing of Hydraulic Blocks with Anaerobic Adhesive
Hydraulic systems are found in many places and serve the purpose of transmitting energy through pipes or other components via fluid – usually oil. This happens by a pump drawing oil from a reservoir and generating so-called oil pressure. This pressure is led through hydraulic pipes or hoses to the point of use (e.g., a motor or a cylinder) and then back to the reservoir. Besides the fluid, enormous forces are at play here. Therefore, it is a great advantage to seal the system with an anaerobic adhesive with medium to high strength.
Hydraulics are used in many applications where a machine needs to lower, lift, pull, rotate, press, or push. A typical example could be a hydraulically driven crane or brake systems in cars, tractors, and many other machines.
About Anaerobic Adhesives
An anaerobic adhesive is a one-component adhesive that cures at room temperature upon contact with metal ions and exclusion of oxygen. It comes in various colors, strengths, and viscosities and is easy to dose manually or automatically. Additionally, it is resistant to many chemicals and has a heat resistance of up to 150–200°C.
Strengths
Anaerobic adhesives vary widely in strength. They are usually categorized as low, medium, or high strength. However, this is a simplified classification, as the adhesives’ break torque can range from 1.5 Nm to over 60 Nm (Newton meters). Break torque refers to the force required to “break” the cured adhesive. When the adhesive breaks, it does not necessarily mean the parts separate immediately. After the break, further force is usually needed to fully separate the parts. This is known as the prevailing torque, also measured in Newton meters.
The required strength depends on the specific task. Generally, hydraulic systems are exposed to considerable forces. The adhesive will often be subjected to vibrations and/or shocks and sometimes needs to seal relatively large components. Therefore, it is usually recommended to use a relatively strong adhesive (medium to high strength).
Approved for Hydraulic Use
Many anaerobic adhesives are approved for use in various environments. It is beneficial to select an adhesive that has already been tested and approved as a hydraulic sealant and is widely used in hydraulic systems.
Passive and Active Metals
For optimal adhesion and short curing time, be aware whether the adhesive is applied to passive or active metals. When bonding passive metals like stainless steel, aluminum, and nickel, it is advisable to use an activator containing metal ions, as curing and fixation times otherwise become (much) longer than when bonding active metals like lithium, brass, and potassium. Such an activator can be invaluable when using anaerobic adhesive in production contexts.
Contact us
Do you have questions about bonding or need advice on choosing the right adhesive for your application? Our experts are ready to help you achieve reliable and durable bonding.
We offer solutions with adhesive products that are tailored to meet your specific needs.
Contact us today for professional advice and support.
Call us at +45 66171802 to speak directly with one of our specialists, or send us an email at info@hojstrup.dk.
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