Soudal Soudaflex PU35

The Soudal Soudaflex PU35 is an elite architectural-grade polyurethane sealant and adhesive engineered to deliver superior mechanical reliability and permanent structural seals. This one-component, moisture-curing product is a foundational solution for modern construction, addressing the critical need for flexible joints in high-traffic and structurally active environments.

Constructed for maximum longevity, Soudaflex PU35 utilizes advanced polyurethane technology to create an integrated bond that resists environmental degradation. Its medium-low modulus formulation is a critical design feature, allowing the sealant to absorb significant joint movement without losing adhesion or suffering cohesive failure. Certified to ASTM C920 class 35, it provides the professional-tier quality required for the most demanding commercial and residential installations.

Key Benefits:

Exceptional Durability: Specifically formulated to withstand the mechanical stress of structural movement and weather exposure.
Advanced Movement Capability: Class 35 rating ensures the sealant can handle expansion and contraction in critical joints.
Multi-Substrate Versatility: A single, reliable solution for bonding and sealing disparate materials like masonry, metal, and wood.
Durable Fitment: Provides a solid, watertight connection that remains permanently elastic after curing.

Technical Specifications:

Brand: Soudal
Product: Soudaflex PU35
Base: Polyurethane
Color: White
Modulus: Medium-Low Modulus
Standard: ASTM C920 class 35

Perfect For:

Concrete & Masonry: Sealing expansion and contraction joints in vertical and horizontal surfaces.
Roofing Systems: Providing watertight seals around penetrations and flashing.
Window & Door Installation: Perimeter sealing to prevent air and water infiltration.

Application Instructions:

Ensure all surfaces are clean, dry, and free from dust, grease, or old sealant residues.
Prepare the joint by using a suitable backer rod to control the sealant depth.
Cut the nozzle at a 45-degree angle to the desired bead size.
Apply the sealant steadily using a professional caulking gun, ensuring full contact with the joint sides.
Tool the sealant within the open time to ensure a smooth finish and optimal adhesion.

Pro Tips:

Backer Rod Usage: Always use a backer rod for deep joints to prevent three-point adhesion, which can cause sealant failure.
Surface Preparation: For optimal results on highly porous surfaces, consider using a primer to enhance bond strength.
Curing Environment: Polyurethane sealants cure via moisture in the air; avoid application in completely dry or extremely cold conditions where curing may be significantly delayed.

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