Sikaflex 554 300ml assembly sealant without primer: the structural bonding solution for lasting watertightness

Sikaflex 554 is the ideal sealant for assembling skylights, antennas, ventilation grilles, etc. without risk of delamination or loss of watertightness due to weathering. Thanks to its silane-terminated polymer (STP) technology, this structural bonding sealant from Sika provides exceptional adhesion on a wide range of substrates without prior primer application, saving considerable time during your installation work.

Whether you are installing heavy components on your bodywork or looking to seal joints exposed to UV rays and extreme temperature variations, this hybrid polymer adhesive guarantees complete peace of mind. Its excellent mechanical resistance absorbs shocks and torsion experienced by the vehicle chassis in motion. By using this product, you protect your materials against corrosion and ensure the longevity of your thermal insulation by preventing any thermal bridges or moisture ingress. Its ease of application, even for beginners, makes it the ideal ally for a professional and secure fit-out.

How to install Sikaflex 554?

Installation requires a few simple steps for maximum effectiveness:

1. Preparation: Thoroughly clean the contact surfaces with a suitable product such as Armaflex Cleaner to remove grease and dust (the use of a specific cleaner is strongly recommended).
2. Anti-rust: In the event of drilling or cutting sheet metal, apply an anti-rust product such as Frameto.
3. Application: Apply the sealant in beads or dots on one of the surfaces to be bonded.
4. Assembly: Press the two elements together before the skin begins to form (approximately 25 minutes).
5. Drying: Allow to cure away from moisture. For heavy structural bonding, provide temporary mechanical support (clamps or holding tape) during the initial setting time.

A Sikaflex 554 perfect for passing VASP certification

During VASP homologation, the watertightness of roof penetrations and permanent ventilation openings is rigorously checked. Sikaflex 554 is perfectly suited to meet the requirements of the DREAL by providing a hermetic and durable seal around ventilation grilles and gas ducts, thus preventing any risk of carbon monoxide or gas infiltration into the cabin.

Technical specifications of Sikaflex 554

• Product type: Single-component hybrid sealant-adhesive (STP technology)
• Capacity: 300 ml cartridge
• Available colours: White
• Skin formation time: Approximately 25 minutes (at 23°C / 50% RH)
• Shore A hardness: ~ 55
• Tensile strength: 3.5 MPa
• Application temperature: from +5°C to +40°C
• Thermal resistance: from -50°C to +90°C (withstands 140°C for short periods)
• Reference specifications: standard format for manual gun, ideal for finishing joints and small bonding applications.
• Key advantages: Solvent-free, very low VOC emissions, resistant to yellowing and weathering.