PU Polyurethane Sealant

Product Video

Application-Based Solutions

• 

  Solution 1: Automotive Glass Structural Bonding & Sealing

  Designed to prevent bonding failure or leakage caused by vibration, wind pressure, and temperature changes during vehicle operation.

  Fast tack-free curing: Skin formation in 10–30 minutes, suitable for production lines and rapid repair.

  Ultra-high mechanical strength: Tensile strength up to ≥6.5 MPa and shear strength ≥4.5 MPa, ensuring long-term safety.

  Excellent workability: Superior sag resistance (≤0.5 mm), ideal for automated or manual application.

  Typical Applications
  Direct bonding of windshields, side windows, and rear windows for cars, buses, and trucks; sealing for special vehicles and rail transportation.

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  Solution 2: Building & Infrastructure Joint Waterproof Sealing

  Designed to prevent long-term water leakage in concrete expansion joints, precast panels, tunnels, and underground structures.

  Low and high modulus options available:

  Low modulus: Elongation ≥600%, ideal for large movement joints.

  High modulus: Excellent resistance to water pressure and puncture, suitable for load-bearing areas.

  Strong adhesion to concrete, stone, and masonry, even under long-term water exposure.

  Easy maintenance: Damaged areas can be locally repaired, reducing lifecycle costs.

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  Solution 3: Industrial Manufacturing & General Bonding

  Reliable adhesion to metal, plastics, glass, and wood.

  Some grades are sandable and paintable after curing.

  High thixotropy ensures excellent shape retention in vertical and overhead applications.

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  Composition

  Formulated with high-purity polyurethane prepolymers and curing agents, combined with fillers, plasticizers, coupling agents, and functional additives to ensure long-term performance stability.

Technical Data (Typical Range)

FAQ

• Q

  What is PU (Polyurethane) sealant and where is it commonly used?

  A

  PU sealant is a moisture-curing elastic sealant widely used for construction joints, expansion joints, metal panels, concrete, roofing, automotive, and industrial sealing applications.

• Q

  Is PU sealant suitable for outdoor use?

  A

  Yes. PU sealants offer excellent weather resistance, elasticity, and adhesion, making them suitable for long-term outdoor applications under varying temperature and humidity conditions.

• Q

  Can PU sealant be painted after curing?

  A

  Most PU sealants can be painted once fully cured. It is recommended to test paint compatibility in advance, as curing time and paint type may affect adhesion and appearance.

• Q

  What substrates does PU sealant adhere to?

  A

  PU sealants adhere well to concrete, masonry, metal, wood, aluminum, galvanized steel, and some plastics. Surface cleanliness and proper preparation are essential for optimal bonding.

• Q

  How long does PU sealant take to cure?

  A

  Skin formation usually occurs within 30–60 minutes, while full curing depends on joint thickness, temperature, and humidity, typically progressing at 2–4 mm per 24 hours.

• Q

  Is PU sealant resistant to water and chemicals?

  A

  PU sealants have good water resistance and moderate resistance to oils, fuels, and chemicals. For highly aggressive chemical environments, specialized sealants may be required.

• Q

  Does PU sealant shrink or crack after curing?

  A

  High-quality PU sealants exhibit minimal shrinkage and maintain long-term elasticity, reducing the risk of cracking when applied correctly.

• Q

  What is the movement capability of PU sealant?

  A

  PU sealants generally offer movement capability of ±25% or higher, allowing them to accommodate joint expansion and contraction caused by temperature changes and structural movement.

• Q

  What is the recommended storage condition and shelf life?

  A

  PU sealants should be stored in a cool, dry place at temperatures between 5–25°C. Typical shelf life is 9–12 months in unopened original packaging.

• Q

  Is PU sealant safe to use indoors?

  A

  PU sealants may release odor during curing. Adequate ventilation is recommended for indoor use. Once cured, the sealant is stable and safe for normal applications.