Description
SIKA® Aktivator 205 solvent-based adhesion promoter: everything you need to know about this bonding primer
The SIKA® Aktivator 205 is a solvent-based adhesion promoter designed to prepare surfaces before bonding or sealant application. It radically improves adhesion on difficult substrates such as glass, metals, or plastics.
This bonding primer is particularly recommended prior to the application of Sika polyurethane and silicone sealants. It cleans, activates, and conditions the surface in a single step.
Result: a durable bond, even on smooth or non-porous substrates, in demanding operating conditions.
What is SIKA® Aktivator 205?
The SIKA® Aktivator 205 is a solvent-based adhesion promoter developed by Sika. It comes in liquid form and is applied before bonding or sealing to prepare surfaces.
Its role is simple: to improve the adhesion of Sika sealants and adhesives on difficult substrates. Without it, some materials reject the bonding product, with it, the bond lasts over time.
It is designed for demanding applications: automotive glazing, industrial assembly, aluminum joinery, and facades. Anywhere the surface is smooth, non-porous, or has low reactivity.
Composition and active principle of the adhesion promoter
Aktivator 205 is based on a solvent base loaded with organosilanes. These coupling agents create a chemical bridge between the substrate and the adhesive or sealant applied over it.
Concretely, the silanes react with the hydroxyl groups present on the material's surface. They form an invisible but highly effective molecular adhesion layer.
The solvent evaporates quickly after application, the waiting time before bonding is generally 5 to 30 minutes depending on conditions. No rinsing is necessary.
This principle distinguishes it from a simple cleaner or degreaser. The Sika® Aktivator-100, for example, is more focused on cleaning/light activation, whereas Aktivator 205 provides a true chemical surface modification for high-performance bonds.
Areas of application and surfaces compatible with SIKA® Aktivator 205
The SIKA® Aktivator 205 is a solvent-based adhesion primer designed to prepare surfaces before bonding or sealing. It improves the adhesion of polyurethane, silicone, and MS polymer sealants and adhesives on substrates that naturally resist bonding.
It is aimed at both automotive glazing professionals and those in construction, industrial joinery, or the manufacturing of commercial vehicles and caravans.
Here are the surfaces compatible with SIKA® Aktivator 205:
- Glass (windshields, fixed glazing, facade glazing)
- Painted or lacquered metals (steel, anodized aluminum)
- Plastics (ABS, PC, rigid PVC)
- Ceramic and enamel
- Smooth non-porous surfaces in general
However, the product is not recommended for porous substrates such as raw concrete, untreated wood, or natural stone. For these substrates, other primers in the Sika range are more suitable.
A simple application with a cloth or sponge is sufficient. The solvent evaporates quickly, leaving a surface that is clean, degreased, and activated, ready to receive the sealant or adhesive in a few minutes.
How to apply SIKA® Aktivator 205: method and precautions for use
Application steps and drying time
Applying SIKA® Aktivator 205 is simple, but it requires rigor. Poor surface pretreatment negates all the product's benefits.
Start by degreasing and removing dust from the substrate. SIKA® Aktivator 205 is not a cleaner: the surface must already be clean before it is applied.
Apply the product with a clean, lint-free, dry cloth soaked with Aktivator 205. Work with light rubbing over the entire area to be treated.
Then, respect the solvent evaporation time before any bonding or joint placement. This delay is critical: it directly determines the quality of the final adhesion.
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