Sikaflex 252 black - gluing kit Sika - adhesive, primer

APPLICATION METHOD

Remember that before applying agents such as primers or glue, the surfaces must be clean, dry and free of grease, oil, dust and contamination.

Additional surface preparation depends on the specifics of the substrate and is crucial for a long-term bond. For surface preparation suggestions, refer to the current issue of the relevant Surface Preparation Guide. It should be taken into account that these suggestions are based on experience and must in any case be verified by tests on the original substrates.

1 - Surface preparation

We start with matting the glued surfaces using abrasive fleece to increase the adhesion of the adhesive.

It is worth protecting the areas around our working area with masking tape.

After finishing matting the surface, let's take care of it o cleaning the surface of the generated dust io degreasing .

2 - Priming the surface

Sika Primer-207 is used to improve the adhesion of a wide range of substrates, such as float glass, ceramic coated glass, primer coatings, painted surfaces, cataphoretic coatings and metals.

App

Shake the container before use Sika Primer-207 until the mixing ball rattles freely. Continue shaking for another minute, then apply a thin but opaque layer with the included brush Sika Cleaner PCA sponges .

The ideal application and substrate temperature is in the range between 15 °C and 25 °C .

Sika Primer-207 should be applied in one coat only. Make sure that this one layer provides adequate, tight coverage. Close the container tightly immediately after each use.

After applying the foundation, wait a few minutes for it to evaporate.

3 - Gluing elements

Sikaflex-252 is a flexible one-component polyurethane adhesive. Suitable for connections subject to dynamic stress. It is suitable for bonding wood, metals, especially aluminum (including anodised), steel sheet (including phosphated, chromated and galvanized), metal primers and paint coatings (2-component systems), ceramics and plastics.

App

Sikaflex®-252 can be applied between 10°C - 35°C (ambient and product) however changes in reactivity and application properties should be considered. The optimal temperature of the substrate and adhesive is in between 15 °C and 25 °C .

Please note that the viscosity of the adhesive increases at low temperatures. For easier application, the adhesive should be conditioned at room temperature before use. To ensure a uniform thickness of the joint, it is recommended to apply the adhesive in the form of a triangular bead.

Glue open time in 23 °C / 50% rh is 35 minutes . The open time of the adhesive is much shorter in hot and humid climates. glued items must always be connected before the open time expires . Never glue parts after the glue has built a skin.

Additional Recommendations:

• the recommended form of the adhesive bead is shown in the diagram,
• the adhesive track should not extend beyond the area of ​​the glued surfaces,
• this product is intended for experienced, professional users only,

Smoothing and finishing

Smoothing must be done within the open time of the adhesive. It is recommended to use Sika® Tooling Agent N for smoothing. Other smoothing agents must be tested for suitability and compatibility beforehand.

Removal

Uncured Sikaflex®-252 can be removed from tools and equipment with Sika® Remover208 or other suitable solvent. After curing, the material can only be removed mechanically. Hands and exposed skin should be washed immediately with hand towels such as Sika® Cleaner-350H or a suitable industrial hand cleaner and water. Do not use solvents on the skin.