Cyanoacrylates and Anaerobics
Cyanoacrylate Adhesives are also known as Super Glues and due to their extraordinary adhesion profile – one component, solvent free, very fast setting – Cyanoacrylates today still reflect the users needs.
Cyanoacrylates polymerise within seconds due to humidity (optimum: 40 to 70 % rel. humidity at 20 to 25 °C). One factor that is very important to consider is; the PH-value. If the surface is acidic, the setting time slows down.
Cyanoacrylates reach very high adhesion figures on most materials, including smooth surfaces. This is the reason why the user does not really have to bother about shear- and tensile strength.
Cyberbond has established a product range that is as follows:
- Powerdrop® series: for hobby and DIY applications
- Elastomer and plastic series: fast setting industrial Cyanoacrylates
- Neomer series: surface insensitive Cyanoacrylates (wood, leather etc.)
- Xtraflex series: partly flexible, heat and impact resistant
- Metal series: high performance on metal to rubber or metal to plastic
- Low odour series: low odour and low blooming characteristics
- Medical series: skin bonding in medical industry
- Frame Fast® series: for fast bonding of screens (Plastic or stainless steel) on frames (alu, stainless steel, wood).
Cyanoacrylates adhesives contain a stabilizer which keeps them liquid. Moisture present on the surfaces to be bonded neutralizes the stabilizer and the adhesive rapidly becomes a polymerized or cured solid.
Bond gaps greater than 0,2mm may not cure at the middle of the bond due to insufficient humidity.
Although 60% of the final bond strength is acheived after only one minute, it can take up to 12 hours before reaching 100%.
Surfaces that are acidic will inhibit or slow down curing. (The stabilizer is an acid.) Materials such as wood, leather and paper carton are acidic.
Some plastics such as polyethylene and polypropylene are difficult to bond without using a primer such as Cyberbond 9050. The primer can also be used to bond PTFE and silicones.
In some applications, an Activator is used to accelerate the curing. Although this may be useful, in general, the final bond strength is always less than it would be if no activator is used.
Cyanoacrylates from the physiological point of view are harmless; they are used extensively in human and veterinary medical applications to bond skin or to treat wounds. But for these applications special products are required. Cyberbond manufactures ISO 10993-certified cyanoacrylate adhesives which are suitable for medical use. Cyanoacrylates are used in the manufacture of many medical devices. There are several approval norms like FDA (US Food and Drug Administration), USP (United States Pharmacopeia) or the ISO 10993 standard.
Cyberbond holds approvals for both USP class VI and ISO 10993 classifications.
More informations
Anaerobics
The Cyberbond range of Anaerobic Adhesives and Sealants are solvent free and are a one-component system. These products can be put into groups of low, medium and high strength grades. The products cure at room temperature by means of contact with metal and the absence of oxygen. Different types of metals give different strengths and setting times. Anaerobic adhesives cure extremely fast on active metals such as copper or brass.
Generally Cyberbond Anaerobic Adhesives and Sealants are used to lock and seal threads, retain threads, shafts, bearings, studs, flanges, etc. The shelf life of Cyberbond anaerobics is one year at room temperature.