APPLICATION
Substrate Preparation
The substrate must be sound, clean, dry and free of all contaminants such as dirt, oil, grease, cement laitance, old sealants and poorly bonded paint coatings which
could affect adhesion of the adhesive.
Sikaflex-117 Metal Force adheres without primers and/or activators. However, for optimum adhesion and critical, high performance applications the following priming and/or pre-treatment procedures must be followed:
Non-Porous Substrates
Aluminium, anodised aluminium, stainless steel, galvanised steel, powder coated metals or glazed tiles, slightly roughen surface with a fine abrasive pad. Clean and pre-treat using Sika Aktivator-205 applied with a clean cloth. Before bonding, allow a waiting time of > 15 minutes (< 6 hours).
Other metals, such as copper, brass and titanium-zinc, clean and pre-treat using Sika® Aktivator-205 applied with a clean cloth. After a waiting time of > 15 minutes (< 6 hours). Apply Sika® Primer-3 N applied by brush. Allow a further waiting time of > 30 minutes (< 8 hours) before bonding.
PVC has to be cleaned and pre-treated using Sika Primer-215 applied with a brush. Allow a waiting time of > 15 minutes (< 8 hours) before bonding.
Porous Substrates
Concrete, aerated concrete and cement based renders, mortars and bricks, prime surface using Sika Primer-3 N applied by brush. Before bonding, allow a waiting time of > 30 minutes (< 8 hours).
For more detailed advice and instructions contact Sika Technical Services.
Note: Primers are adhesion promoters and not an alternative to improve poor preparation / cleaning of joint surfaces. Primers also improve the long-term adhesion performance of a bond.
APPLICATION METHOD / TOOLS
Bonding Procedure
After the necessary substrate preparation, cut the top of the cartridge before or after inserting into the sealant gun. Then cut the nozzle for the desired bead size and fit the nozzle onto the cartridge.
Apply in beads, strips or spots at intervals of a few centimetres each. Use hand pressure only to fix the components to be bonded into position before skinning of the adhesive occurs. Incorrectly positioned components can easily be unbonded and repositioned during the first few minutes after application. If necessary, use temporary adhesive tapes, wedges, or supports to hold the assembled components together during the initial curing time.
Fresh, uncured adhesive remaining on the surface must be removed immediately. Final strength will be reached after complete curing of Sikaflex-117 Metal Force, i.e. after 24 to 48 hours at +23 °C, depending on the environmental conditions and adhesive layer thickness.
LIMITATIONS
▪ For optimum workability, the recommended adhesive temperature is +20 °C.
▪ Application during high temperature changes is not recommended (movement during the curing).
▪ Before bonding, check adhesion and compatibility of paints and coatings by carrying out preliminary trials.
▪ Sikaflex -117 Metal Force can be overpainted with most conventional water-based coating and paint systems. However, they must first be tested to ensure compatibility by carrying out preliminary trials. The best over-painting results are obtained when the adhesive is allowed to fully cure. Note that non-flexible paint systems may impair the elasticity of the adhesive and lead to cracking of the paint film.
▪ Colour variations may occur due to exposure to chemicals, high temperatures and/or UV-radiation (especially with the colour shade white). However, a change in colour is purely of aesthetic nature and does not adversely influence the technical performance or durability of the product.
▪ Always use Sikaflex -117 Metal Force in conjunction with mechanical fixings for overhead applications or heavy items.
▪ For very heavy items provide temporary support until Sikaflex -117 Metal Force has fully cured.
▪ Full surface applications / fixings are not recommended since the inner part of the adhesive layer may never cure.
▪ Before using on reconstituted, cast or natural stone, contact Sika Technical Services.
▪ Do not use on bituminous substrates, natural rubber, EPDM rubber or on any building materials which might leach oils, plasticisers or solvents that could degrade the adhesive.
▪ Do not use on polyethylene (PE), polypropylene (PP), polytetrafluoroethylene (PTFE / Teflon), and certain plasticised synthetic materials. Preliminary trials are
recommended or contact Sika Technical Services.
▪ Do not use for glass bonding if the bond line is exposed to sunlight.
▪ Do not use for structural bonding.
▪ Do not expose uncured Sikaflex -117 Metal Force to alcohol containing products as this may interfere with the curing reaction.
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