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Recommendations

The surfaces to be joined should be clean prior to bonding. Cleaning in a compatible solvent may be necessary to remove oil, grease, mold release agents and other foreign materials.

Akulon (PA6 and PA66)

Epoxy, urethane, cyano-acrylic, silicone and hot melt adhesives are suitable for bonding Akulon PA6 and PA66


Stanyl (PA46)

Although many different glues can be applied to polyamides, only a few can be recommended for use in Stanyl at high temperatures of 120°C. A selection of possible adhesives for Stanyl is listed below.

The peel strength of glued Stanyl parts depends on:
- The moisture content of the Stanyl parts: dry as molded parts give higher peel strengths than conditioned parts
- Environmental conditions (chemical attack), size and kind of loading, size of the gap between the mating parts.
- The application of a pretreatment: peel strengths measured on parts which are not pretreated, are in the range of 3-4 MPa, while pretreatment shifts this range to 10-17 Mpa.

Applicable pretreatments are:

•Abrading the surface with medium grit (80-150) emery paper or grit blasting (especially effective for polyurethanes and acrylates)
•Etching the surface (3 minutes at 20ºC) with a mixture of sulphuric acid (90%), potassium dichromate (4%) and water (6%)
•Priming the surface by means of a mixture of resorcinol, ethanol and p-toluene sulfonacid, a nitrilphenol based solution or by means of a resin based on resorcin formaldehyde
•Plasma or UV/ozone pretreatment (especially effective in combination with glues based on epoxies)

The adhesive forms the weakest link in a glued Stanyl component due to the lower temperature resistance of the adhesive. Consequently, adhesive bonding is not a preferred joining technique for Stanyl. More stable systems can be realized by using welding techniques or mechanical fasteners.


Arnite (PBT and PET)

Ethylcyanacrylate, methacrylatelastomer, ethyl, methyl, polyurethane, epoxy and silicone type adhesives are suitable for Arnite PBT and PET. Hot melt adhesives can also be applied. The area to be joined should be lightly roughened and free of grease. The adhesion strength obtained, however, will be below the specified product strength.


Arnitel (TPE)

Good bonding results can be achieved on Arnitel components with polyurethane adhesives. Normally two-component systems are used, with isocyanate or di-isocyanate hardeners.

Laminating Arnitel (e.g. to fabric) can be done with a TPU (thermoplastic polyurethane) hot melt adhesive. The high temperature during melting of the adhesive activates the hardener in the hot melt.

Xantar (PC), Xantar C (PC + ABS) and Stapron E (PC + PET)

A variety of adhesive types can be used for bonding Xantar PC and PC-blends: epoxy, urethane, cyano-acrylic, acrylic, methacrylic, silicone and hot melt. UV-transparent grades can also be bonded with UV-cure types. Being amorphous materials, Xantar and PC-blends are relatively sensitive to stress cracking induced by solvents, or to degradation due to specific chemical substances like amines. The best results are achieved with solventless adhesives.

Reactive adhesives make it possible to bond Xantar to many other materials. The application of reactive adhesives is simple and fast compared to adhesive solvents and the requirements to accurately align the joint areas are not as high. Reactive adhesives with elastic properties after curing are used in the automotive industry (e.g. for gluing lenses of transparent PC to metallized surfaces or to opaque PC).

Reactive adhesives for Xantar based on epoxy resin must be free of low molecular weight amines. Polymeric amino amides can be used as hardeners. The possible reaction of residual amino groups with Xantar must be avoided by ensuring that the amino groups react completely with the epoxy groups.

Two-component and one-component polyurethane adhesives have also proven successful in joining PC, but they must be free of solvents and amines.

Silicone adhesives are particularly suitable as joint-gap-filler systems (e.g. for glazing of industrial and greenhouse windows).

Cyano-acrylic adhesives, should be used only to bond stress-free parts that will not be subjected to hydrolytic loads during use.

Mild surface abrasion (sanding) may improve adhesion by providing an increase in both surface area and the potential for mechanical coupling.

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