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WEICON Contact Cyanoacrylate Adhesives

WEICON Contact Cyanoacrylate Adhesives are cold-curing one-component adhesives, free of solvents. They quickly polymerise by reacting with moisture both on the surfaces to be bonded and from the air, and cure under light pressure.

They will bond within seconds almost all materials to and among each other, such as:

• metals
• plastics
• glass
• ceramics
• wood
• leather
• natural and synthetic rubber

When using WEICON Contact Cyanoacrylate Adhesives, unlike in the case of welding and soldering, surfaces remain unaltered. No material stress occurs. Thus, more simple and rapid assembly is often possible, and auxiliary fixing devices are not necessary.

The resulting advantages are numerous:

• enormous time and, therefore, cost savings
• immediate on-processing of fixed parts possible
• high bond strength up to material fracture
• clean and optically appealing bondings

WEICON Contact Cyanoacrylate Adhesives provide high structural strength, with a temperature resistance from -50°C to up to +135°C and good levels of resistance to a lot of chemicals. In many instances, the cured bond joint proves to be harder than the material of the bonded parts (material fracture).

A wide range of product types is available for a variety of applications. The types differ chemically and by their viscosity.

Ethyl ester based types

Due to the size of the molecules and the resulting anchoring points positioned far from each other, a higher elasticity of the bond joint is achieved. These types are recommended for bonding plastics and rubber.

Alkoxy ethyl based types

Also with adhesives on this basis there is flexibility concerning the curing due to the similar molecule structure. However, its particular characteristic is its low odour and, therefore, user-friendly processability especially with assembly line manufacturing.When cured, they are less sensitive to humidity and should be applied in those instances where the white “blooming” of the bond line is not tolerated for optical reasons.

Methyl ester based types

Due to their small molecule structure and closely positioned anchoring points, these types are less flexible after curing. Therefore, they offer particularly good application possibilities for bonding metals.

Different types

>> Pen System
>> Contact Filler

Continuous development and adaptation to the latest demands based on practical experience and the environment guarantee, furthermore, constantly high quality standards.

For type selection chart (see menu, left ) and technical data:

>> Brochure/ Technical data
>> EC Safety data sheets (overview)

Directions for application

• To ensure a perfect bonding, the surfaces to be joined must be clean and dry (to clean and degrease use e.g. WEICON Cleaner S).
• Smooth surfaces should be mechanically roughened.
• Apply WEICON Contact Cyanoacrylate Adhesive only on one of the surfaces to be bonded.
• The bond line should be between 0.05 mm and max. 0.2 mm in thickness. Otherwise complete hardening cannot be guaranteed.
• For bonding large surfaces WEICON Contact Cyanoacrylate Adhesive should be applied drop by drop to avoid inner tensions.
• WEICON Contact Cyanoacrylate Adhesives are very economical. One drop is sufficient to cover approx. 3 - 5 cm² of bonded surface.
• The parts to be joined should be bonded in an atmosphere of 40 - 80 % relative humidity. In conditions of below 40%, the cure will be considerably slowed or even inhibited. With a relative air humidity of more than 80% or with basic substrates (e.g. glass), shock- curing can occur. In such cases, some materials show a drop in bond strength of 10 – 15 %, due to inner tensions in the bond line.
• Basic-reacting surfaces (pH-value >7) will speed up the cure whereas acidic-reacting surfaces will retard and, under extreme conditions, completely inhibit the polymerization.

Physiological Properties
Health and safety at work

Physiologically, WEICON Contact Cyanoacrylate Adhesives may be considered as essentially harmless. However, ensure sufficient ventilation of workplaces to cope with the adhesive’s typical vapours.Vapours of WEICON Contact may cause irritation of the mucous membranes and the eyes. Avoid contact with skin and eyes (wear gloves and protective goggles). The use of WEICON Hand Protective Foam prevents skin irritation and hand cleaning problems.

Storage

WEICON Contact Cyanoacrylate Adhesives should always be stored in a cool, dry and dark place. The shelf life is at least 9 months if stored at room temperature (18 - 25°C). If stored at +5°C (e.g. in a refrigerator), the shelf life can be extended to 12 months. By freezing down to -20°C the adhesives can be stored for a nearly unlimited period. However, they must then be brought to room temperature prior to use.

Important Note:
All specifications, recommendations and techncial data are based on laboratory tests under optimum conditions resp. on practical experience. They have been compiled most carefully. Nevertheless, a claim cannot be derived from them. We therefore recommend to carry out own tests before application. The user bears the only responsibility for non-appropriate or other than specified applications.