Structural Adhesive - 252 |
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| Description |
Sikaflex®-252 is a non-sag one-component polyurethane adhesive of stiff, paste-like consistency which cures on exposure to atmospheric moisture to form a durable elastomer. Sikaflex®-252 exhibits excellent adhesive properties and a high degree of mechanical strength.
Sikaflex®-252 is manufactured in accordance with the ISO 9001/14001 quality assurance system. |
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| Product Benefits |
• 1-C formulation
• Elastic
• Can be overpainted
• Good gap-filling properties
• Capable of withstanding high dynamic stresses
• Vibration-damping
• Non-corrosive
• Electrically non-conductive
• Bonds well to a wide variety of substrates |
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| Areas of Application |
| Sikaflex®-252 is suitable for structural joints which will be subjected to high dynamic stresses. Suitable substrate materials are timber, metals, particularly aluminium (including anodised finishes), sheet steel (including phosphated, chromated and zinc-plated components), metal primers and paint coatings (2-C systems), ceramic materials and plastics (unsaturated polyester resin). |
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| Cure Mechanism |
| Sikaflex®-252 cures by reaction with atmospheric moisture. At low temperature the water content of the air is generally lower and the curing reaction proceeds slower (see diagram). |
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| Chemical Resistance |
Sikaflex®-252 is resistant to fresh water, seawater, sewage effluent and aqueous detergent solutions; temporarily resistant to fuels, mineral oils, vegetable and animal fats and oils; not resistant to organic acids, alcohols, concentrated mineral acids and caustic solutions or paint thinners.
The above information is offered for general guidance only. Advice on specific applications will be supplied upon request. |
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| Method of Application |
| Surface preparation. Surfaces must be clean, dry and free from all traces of grease, fat, oil and dust. As a rule the faces to be bonded must be prepared in accordance with the instructions given in the current edition of the Sika® Primer Table. Advice of specific applications is available from the Technical Service Department of Sika Industry. |
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Toughened glass
with uniform and
continuous opaque,
mineral based
ceramic frit with light
transmission
* more,
than 0,1%**. |
Sika®
Aktivator +
Sika®
Primer-
206 G+P |
Toughened glass with
uniform and continuous
opaque, mineral
based ceramic frit
with light transmission
*
less, than 0,1%**. |
Sika®
Aktivator |
Metal with paint
primer or with partial
new painting
(< 25%) |
Sika®
Aktivator |
| Metal painted with
two part finish
lacquers |
Sika®
Aktivator
+ Sika®
Primer-
206 G+P |
| Old polyurethane
direct glazing
adhesive (cut face) |
Sika®
Aktivator |
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* Getag 200D, visible range
**For laminated glass this limit is 0,2%. |
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| Advice on specific applications is
available from the Technical Service
Department of Sika Industry. |
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| Application |
Pierce the cartridge membrane completely. Cut off the tip of the nozzle. To ensure a uniform thickness of adhesive bed, we recommend that the adhesive be applied in the form of a triangular bead.
Do not apply at temperatures below 10ºC or above 35ºC. The optimum temperature for substrate and adhesive is between 15ºC and 25ºC.
For cartridge application we recommend the use of a compressed-air piston-type cartridge gun or a heavy-duty hand-operated gun. |
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Tooling and finishing. Tooling and finishing must be carried out within the tack-free time of the adhesive. Finishing agents or lubricants must be tested for suitability / compatibility. We recommend the use of Sika® Tooling Agent N.
Removal. Uncured Sikaflex®-252 may be removed from tools and equipment with Sika® Remover-208. Once cured, the material can only be removed mechanically.
Hands and exposed skin should be washed immediately using a suitable industrial hand cleanser and water. Do not use solvents.
Overpainting. Sikaflex®-252 can be overpainted when tack-free. The paint must be tested for compatibility by carrying out preliminary trials. Baked enamels should not be applied to Sikaflex®-252 until the adhesive has attained full cure. It should be understood that the hardness and film thickness of the paint may impair the elasticity of the adhesive and may lead to cracking
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| Further Information |
Copies of the following publications are available on request:
• Primer Chart
• Material Safety Data Sheet |
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| Packaging Information |
Cartridge = 300ml
Unipac = 600ml |
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Important |
| For information and advice on the safe handling, storage and disposal of chemical products, users should refer to the current Safety Data Sheet containing physical, ecological, toxicological and other safety-related data for this type of product. |
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| Note |
| The information, and, in particular, the recommendations relating to the application and end-use of Sika products, are given in good faith based on Sika's current knowledge and experience of the products when properly stored, handled and applied under normal conditions. In practice, the differences in materials, substrates and actual site conditions are such that no warranty in respect of merchantability or of fitness for a particular purpose, nor any liability arising out of any legal relationship whatsoever, can be inferred either from this information, or from any written recommendations, or from any other advice offered. The proprietary rights of third parties must be observed. All orders are accepted subject to our current terms of sale and delivery. Users should always refer to the most recent issue of the Australian version of the Product Data Sheet for the product concerned, copies of which will be supplied on request. |
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