About Adhesives

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About ADHESIVES FOR INDUSTRY & ADHESIVE BONDING

About Adhesives
About Bonding
Limitations

About Adhesives

HOT MELTS ...Require no energy for drying or mixing. They set quickly, with open time ranging from 5 seconds to 8 minutes, which eliminates the need clamps or fixtures. Offers long term durability, resistance to moisture, chemicals.

ADHESIVE DISPENSERS A full range of hot melt applicators including the highest applicator available. Also Spray Tool, Electric or pneumatic, Bench Mounts, Hot Wheel Coaters and Bulk Hot melt Dispensers.

EPOXIES/STRUCTURAL ADHESIVES ...Welcome to the amazing world of Epoxy Patch Kits, Patch     Systems, Polyurethane Adhesives, Methacrylates and other bonding solutions.

CYANOACRYLATES ...The Instant Adhesive bonding metals to metals, rubber to metal, pre-assembled plastic parts, porous materials such as foam rubber, wood, cork and leather. ``Product Purity makes the
difference with these cyanoacrylates.

UV ADHESIVE SYSTEMS...Lighting the way to improved UV processing of adhesives and coatings using
              equipment designed to provide the exact light ``shaped" to your requirements, from small intensive UV spot lights to larger flooded fields.

SEALANTS...High quality polyurethane sealants provide excellent performance characteristics and moving capabilities for industrial applications. Offering a unique combination of toughness, adhesion long life, elasticity and water tightness.

AEROSOLS...Industrial Aerosol Adhesives, Lubricants and Sprays for maintenance, fabric, foam, textile
screen printing, packaging, upholstery, furniture, floor covering. Silicone lubricants for machinery. Pressure sensitive sprays.

CARTON SEALING   Get faster, stronger, carton set-up and sealing with the hot melt assembly and
packaging systems. Compare the cost and the differences between hot melt versus staples and tape.

METER/MIX AND MIXERS ...Meter/Mix Dispense Systems for structural adhesives. Features dispensing guns, cartridges systems, and dual syringe applications along with motionless mixers.

MOLD RELEASE AGENTS ...For advanced composites,cultured marble and reinforced fiberglass, boat
building and rubber polyurethane molding.

             ADHESIVE TECH CENTER..A complete Tech center at your fingertips...For evaluations, trials, and samples,
              Call your Adhesive Tech center at 1-800-323-5158 or EMail .


	ABOUT BONDING ADVANTAGES of ADHESIVE BONDING - Reprinted from Ciba's User's Guide to Adhesives The bond is continuous. On loading, there is a more uniform distribution of stresses over the bonded area. The local concentrations of stresses present in spot welded or mechanically fastened joints are avoided. Bonded structures can consequently offer a longer life under load.The bonded joint being continuous produces a stiffer structure. Alternatively, if increased stiffness is not needed, the weight of the structure can b decreased while maintaining the required stiffness.

Figure 1 Stiffening effect-bonding and riveting compared
The diagram shows how a joint may be designed to take advantage of the stiffening effect of bonding. Adhesives form a continouus bond between the joint surfaces. Rivets and spot welds pin the surfaces together only at localised points. Bonded structures are consequently much stiffer and loading may be increased (by up to 30-100%) before buckling occurs.

Figure 2 Stress distribution in loaded joints
The riveted joint on the left is highly stressed in the vicinity of the rivets. Failure tends to initiate in these areas of peak stress. A similar distribution of stress occurs with spot welds and bolts. The bonded joint on the right is uniformaly stressed. A continuous weld joint is likewise uniformally stressed but the metal in the heated zone will have undergone a change in strength.

Adhesive bonding gives a smooth appearance to designs: there are no protruding fasteners such as
screws or rivets, and no spot weld marks.

              The bonded structure is a safer structure because, owing to the fewer and less severe
              concentrations of stresses, fatigue cracks are less likely to occur. A fatigue crack in a bonded structure will propagate more slowly than in a riveted structure or even in a machined profile
because the bond lines act as a crack stopper.

              Adhesive bonding does not need high temperatures. It is a suitable means for joining togetheR heat sensitive materials prone to distortion or to a change in properties from the heat of brazing oR welding.

              Complex assemblies that cannot be joined together in any other way are feasible with adhesives.Composite sandwich structures are a typical example.

              Adhesives can join different materials together materials that may differ in composition, moduli, coefficients of expansion, or thickness.

              The continuous adhesive bond forms a seal. The joint is consequently leak proof and less prone to corrosion.

              The adhesive bond can provide an electrically insulating barrier between the surfaces.

              Adhesive bonds have good damping properties. This capacity may be useful for reducing sound or vibration.

              Adhesive bonding can simplify assembly procedures by replacing several mechanical fasteners with a single bond, or by allowing several components to be joined in one operation.

              Adhesive bonding may be used in combination with spot welding or riveting techniques in order to improve the performance of the completed structure. The riveted joint on the left is highly stressed in the vicinity of the rivets. Failure tends to initiate in these areas of peak stress. A similar distribution of stress occurs with spot welds and bolts.

              All these advantages may be translated into economic advantages: improved design, easier
assembly, lighter weight (inertia overcome at low energy expenditure), longer life in service.

              The bond is continuous. On loading, there is a more uniform distribution of stresses over the bonded area. The local concentrations of stresses present in spot welded or mechanically fastened joints are avoided. Bonded structures can consequently offer a longer life under load.

              The bonded joint being continuous produces a stiffer structure. Alternatively, if increased stiffness is not needed, the weight of the structure can be decreased while maintaining the required stiffness.

Limitations

              Adhesives are drawn from the class of materials which we know as'polymers', 'plastics' or synthetic resins'. They have the limitations of that class. They are not as strong as metals. (The difference is offset by the increased surface contact area provided by the bonded joints.) With increasing temperature the bond strength decreases, and the strain properties of the adhesive move from elastic to plastic. This transition is usually in the temperature range 70180'C: the transition
temperature depends on the particular adhesive.

              The resistance of bonded joints to the in service environment is dependent on the properties of the polymer from which the adhesive is made. Possible exposure of the bonded structure to oxidizing agents, solvents, etc., must be borne in mind when selecting the adhesive type to use. With most adhesives maximum bond strength is not produced instantly as it is with mechanical fastening or with welding. The assembled joint must be supported for at least part of the time during which the strength of the bond is building up.

              The quality of the bond may be adversely affected if, in the bonding process, the surfaces are not easily wetted by the adhesive. To ensure consistently good results may necessitate the setting up of unfamiliar process controls. A badly made joint is often impossible to correct. Bonded structures
are usually not easily dismantled for in service repair.

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