Instant Adhesives glossary
A full list of common industry terms and their definitions.
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Chemicals which can be applied directly to a surface to speed up the solidification of an adhesive. Pre-applied, they provide faster fixture speed and accelerate final cure of instant adhesives. Post-applied, they accelerate cure of excess or exposed adhesive.
Cyanoacrylates are extremely rapid curing one component adhesives that are known as instant adhesives. They can be made from different cyanoacrylate monomers (such as methyls, ethyls, etc.) They are solvent free and one component products. Their polymerisation is initiated by the moisture on the surfaces of the substrate materials to cure on almost any surface or substrate in just a few seconds, especially in very thin bondlines.
A joint strength of the bonded substrates of 0,1N/mm². The fixture time is the time when fixture strength is reached.
A joint of two ore more bendable substrates. The adhesive takes over the bend forces until the maximum elongation at break of the adhesive. The elongation at break is measured in percent and compares the difference in one dimension (e.g. length) of the cured adhesive in its original, non-bended shape and the bended shape. Remember, a flexible CA for bendable joints is not a toughened CA.
A viscous, jelly-like mixture created when a liquid finely disperses in a solid to become colloidal or semi-solid in consistency.
A test that subjects components or materials to elevated temperatures, to evaluate changes in performance in order to predict service life. Strength is measured at room temperature after some period of aging at elevated temperature.
Strength measured at elevated temperature.
A dynamic load that is applied and removed suddenly, e.g. a sharp, intense blow.
The term “instant adhesive” is frequently used to describe cyanoacrylates, a group of extremely rapid curing one-component adhesives.
Low bloom / Low odour
Blooming is a white cloudiness that can be seen around the surface area of a bonded part. It may occur when the cyanoacrylate monomer volatilizes and settles on the part because cure is too slow. More an aesthetic than a performance problem, it must be avoided for cosmetically critical applications. The low odour characteristic improves user comfort.
Operating temperature range
The typical range of temperature over which an adhesive can work effectively in continuous service.
The resistance of an adhesive to forces that act on one of both bonded parts at an angle to the bondline. Standard peel resistance tests are performed at 90° or 180° angle.
A coating applied to a surface, prior to the application of an adhesive, to aid the ability of an adhesive to adhere to the substrate (especially on difficult to bond substrates).
The period of time during which a packaged adhesive can be stored under specified temperature conditions and remain suitable for use.
A shock load is defined as the sudden and rapid application of force placed on a structure.
To alter or improve the properties of cyanoacrylate adhesives, they can be toughened with rubber to achieve enhanced resistance to impact, peel and shock loads at elevated temperatures as well as good resistance in humid and/or chemical environments.
Property of a fluid that tends to prevent it from flowing when subjected to an applied force. Low-viscosity fluids flow easily; high-viscosity fluids resist better against flow.