Sika Aktivator 205 Transparent Solvent-Based Adhesion Promoter
A colourless, solvent-based adhesion promoter that reacts with moisture and deposits active groups on the substrate — forming a link between non-porous substrates and Sika primers, sealants and adhesives. Formulated for treating bond faces before applying Sikaflex® and Sikasil® adhesives and sealants.
Professional Use — Suitable for experienced professional users only. Because it is prone to stress cracking, it must be tested with the actual substrates and site conditions to confirm adhesion and material compatibility before full application.
P.O Box 2806, Industrial Area 15, Sharjah UAE — expert coordination, authentic supply, site-ready delivery.
What is Sika Aktivator 205?
Sika Aktivator 205 is a solvent-based, colourless adhesion promoter. It reacts with moisture and deposits active groups on the substrate, which act as a link between the substrate and the primer, sealant or adhesive applied over it. It is specifically formulated for the treatment of bond faces prior to the application of Sikaflex® and Sikasil® adhesives and sealants.
It is used to improve adhesion on a wide variety of non-porous substrates — such as metals, plastics, ceramic screen prints and painted surfaces — enhancing the bond of Sikaflex® and Sikasil® adhesives and sealants. This product is suitable for experienced professional users only and should be tested with the actual substrates and conditions to ensure adhesion and material compatibility, as it is prone to stress cracking.
Typical Substrates
Key Benefits
- Easy to use — requires only a simple wipe-on, air-dry on the surface.
- Enhanced adhesion on non-porous substrates — the active groups act as a link between non-porous substrates and primers or sealants/adhesives.
- Short flash-off time — evaporates in under 10 minutes at ≥23°C, with the maximum being under 2 hours.
- Transparent — purely colourless and clear in appearance.
A — Measured at 23 °C / 50 % r.h. · B — For a specific application, temperature and flash-off time may be different.
Chemical & Physical Properties
| Base Chemistry | 1-Part solvent-based |
| Appearance | Colourless, clear |
| Application Temperature | 5 – 40 °C |
| Application Method | Wiping with lint-free paper towel |
| Consumption | 20 ml/m² |
| Shelf Life | 12 months B |
| Pack Size | Cans (30 ml, 250 ml, 1000 ml) and Pad |
B — Stored in a sealed container in a dry place at ≤ 25 °C.
Ideal Site Conditions
| Ideal Application & Surface Temp | Between 15 °C and 25 °C |
| Consumption / Method | Depends on the specific nature of the substrate |
| Re-Activation | Repeat process once only, within max. flash-off time |
| Post Finish | Reseal 250 ml & 1000 ml cans after use; dispose 30 ml cans |
Suitability
| Suitable For | Non-porous substrates — metals, plastics, ceramic screen prints, painted surfaces |
| User Level | Experienced professional users only |
| Note | Prone to stress cracking — trial on actual substrate before use |
Application Guide
Follow these steps to achieve reliable adhesion when treating bond faces with Sika Aktivator 205. Ideal application and surface temperature is between 15 °C and 25 °C. Always refer to the current Sika Product Data Sheet.
Surface Preparation
Surfaces must be clean, dry and free from grease, oil, dust and contaminants. Any adjacent areas must be protected by masking before application.
Substrate Preparation
Adhesion on substrates may be improved by adding and/or combining pre-treatment processes such as scuffing and cleaning prior to the activator application. A short solvent trial is recommended to confirm compatibility on the actual substrate.
Application Process
Use a fresh, lint-free paper towel that has been moistened (not wet) with the product to wipe the bond faces. Do not dip the towel directly into the product or re-moisten it, and always use a fresh towel for each application. The surface must be wiped with the clean side of the towel.
Solution for Process Failure
If the pre-treated area is not bonded within the maximum flash-off time, repeat the activation process — once only. Do not repeatedly re-activate the same surface.
Post Finish
For the 250 ml and 1000 ml cans, tightly reseal the container immediately after each use to prevent solvent evaporation and contamination of the remaining product. The 30 ml cans are single-use and should be disposed of after application.
Not for Porous Substrates
Do not apply on porous substrates — it may not dry completely and can prevent the adhesive or sealant from curing. This product is for non-porous bond faces only.
Product Trial
Preliminary trials must be conducted — the product contains solvent that may dull the surface finish of freshly applied paints. Wipe off immediately with a clean, dry cloth in case of any accidental splash onto nearby surfaces.
Use Minimum Amount
Applying excess product could lead to adhesion failure. It must be used cautiously in the minimum amount required — more is not better.
Solvent Exposure
Discard immediately if the colour turns opaque instead of clear. Dispose of the product roughly one month after opening if used frequently, or after two months for infrequent use.
Never Dilute or Mix
Never dilute or mix the product with any other substance. It must not be used for tooling/smoothing of products or as a cleaning agent.
UV Protection
Use on transparent/translucent substrates such as float glass and plastics requires adequate mandatory UV protection — except when used with Sikasil® silicone sealants and adhesives.
Related Products
Sika Aktivator 205 works within Sika's surface-preparation and priming system. Combine with the compatible primers and activators below for a complete bonding solution. All stocked by Highway BMT.