TAPES + ADHESIVES Future-oriented adhesive tapes tesa®
says that it is taking the chemistry involved in tape production forward a generation with tesa® ACXplus, a
future-oriented range of adhesive tapes that guarantee optimal strength for constructive bonding on materials with different surface characteristics.
outdoor applications. During the life cycle of a component, static and dynamic
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forces act upon the constructive bond. In outdoor applications there will be temperature variations to contend with and often the effects of high wind loads, water, UV light or even exposure to chemicals. Dissimilar materials also show different elongations when temperatures change, creating extreme physical stresses that need to be dissipated for the bond to be durable. The ability that tesa®
ACXplus has to compensate for different
thermal elongations and extreme conditions is based on its viscoelasticity; a material performance defined by both elastic and viscous characteristics. The elastic restoring forces provide inner strength while the
viscous part of the material behaviour leads to the relaxation of mechanical stresses. Due to the viscoelastic behaviour of the tape, arising stresses can be dissipated through relaxation of the tape and a secure, long-term bond achieved. tesa®
esa® ACXplus technology enables a new functional
combination of the tapes’ chemical components to effectively withstand the dynamic and static stresses that constructive bonds are subject to, particularly in
employs a special acrylic adhesive system that combines both effects to provide excellent results. Jeremy Smith, marketing manager of tesa UK, summarises
the significance of this product in ensuring the strength of constructive bonds: “When two materials with different thermal elongations, for example aluminium on steel or deco glass on composite fibre, are bonded tesa®
ACXplus will deliver a
consistent bond irrespective of the conditions in which the application is found. The special balance between elastic and viscous performance does not only secure an optimal wetting of different surfaces, it also allows absorption of dynamic forces and vibrations and stress relief in the bonded joint.”
ACXplus Helping preserve cultural heritage
It’s the nature of all materials to degrade and deteriorate over time. However, specialist products from British surface coatings manufacturer HMG say it is dedicated to preserving these materials at both ends of the natural cycle.
vehicle colours, extensive library of heritage paints and conservation-grade adhesives help restore culturally significant structures and artefacts for future generations. “People know that paints and adhesives contain solvents
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and other chemicals and wrongly assume that they are environmentally unfriendly,” says HMG’s managing director, John Falder. “But our technology can extend the working life of many man-made objects, saving the raw materials otherwise needed to replace them, and help restore and preserve damaged, corroded or fragmented objects without affecting their historical importance, whether it’s a vintage vehicle or an archaeological find.” The company’s conservation-grade glues are represented
by HMG Heat & Waterproof Adhesive and HMG B72 Restoration Adhesive, which are known in archaeological circles worldwide and by museums, galleries, conservators and restorers for
ts anti-corrosive primers, preservative wood treatments, weather-resistant masonry paints and high performance coatings help protect them against abrasion, wear, chemical and environmental attack; while its historical
their technical performance. One of the guiding principles of interventive conservation is that of ‘reversibility’, whereby the object should be capable of being returned to its original state prior to intervention; and both HMG’s museum-grade adhesives are formulated to be permanently reversible and resealable in solvents, so that artefacts can be subsequently unglued for correcting mistakes, minor realignment or adding newly-found fragments. They also possess the correct levels of plasticity and viscosity necessary for good workability, desirable water-white transparency and non-yellowing characteristics, and excellent physical and chemical stability. The traditional favourite, HMG Heat & Waterproof Adhesive
is a single-pack, clear product, which is touch dry in 5 minutes and hard dry in 10 minutes, resisting temperatures up to 100°C. In contrast, HMG B72 Acrylic Adhesive offers longer working times, being touch dry in 3 – 5 minutes, surface dry in 1 hour and hard dry in around 6 hours; not having instant grab, the glue allows fragments to be easily readjusted and surplus adhesive removed with acetone, for virtually invisible joins.
146 Fastener + Fixing Magazine • Issue 76 July 2012
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