Welcome to Supex
Welcome to Supex
Supex PU 25 is a high-performance polyurethane sealant and adhesive built for strong, flexible bonding and sealing in construction, automotive, and industrial projects. It provides outstanding adhesion to many surfaces, superior weather and chemical resistance, plus long-term elasticity—perfect for expansion joints, panels, and structural work indoors or outdoors.
100% Authentic products
25+ Years of expertise
Pan-India delivery
100% Authentic products
25+ Years of expertise
Pan-India delivery
Supex Polyurethane Sealant is a high-performance moisture-curing polyurethane (PU) sealant designed for flexible sealing and strong adhesion in construction, automotive, and industrial applications. It provides excellent bonding to concrete, metal, wood, glass, aluminum, and masonry surfaces, making it suitable for demanding sealing environments.
This elastic PU sealant offers long-lasting flexibility, strong adhesion, and superior weather resistance. It is widely used for expansion joints, concrete sealing, structural joints, and automotive body sealing, where reliable waterproof and durable sealing is required.
Supex PU Sealant is trusted by construction professionals, fabricators, and infrastructure developers across building construction, automotive, and industrial sectors.
Supex PU 25 sealant is widely used in multiple industries requiring durable and flexible sealing.
This sealant is widely used in construction PU sealant applications.
Ideal for infrastructure and heavy-duty sealing projects.
Commonly used as an automotive polyurethane sealant.
Suitable for industrial PU sealing applications.
Supex PU sealant bonds strongly to a wide range of construction and industrial materials.
This wide compatibility makes it suitable for various applications. Request Technical Data Sheet ( TDS)
| Feature | Polyurethane Sealant | Silicone Sealant |
|---|---|---|
| Paintable | Yes | No |
| Strength | High | Medium |
| Adhesion | Excellent | Good |
| Flexibility | High | Very High |
| Best Use | Structural joints | Glazing |
1. What is Supex PU 25 PU sealant used for?
Sealing expansion joints, concrete/masonry gaps, prefab buildings, rainwater pipes, gutters, HVAC ducts. Bonding in automotive (bus/truck floors, panels, FRP, roofs), metal/wood/glass joins, vibration control. Ideal for construction, infrastructure, elevators.
2. Is Supex PU 25 paintable?
Yes, Supex PU 25 is fully paintable and sandable after curing
3. Difference between PU sealant and silicone sealant?
PU sealant offers superior mechanical strength, tear resistance, paintability, and adhesion to porous/dissimilar materials (concrete, wood, metal). It excels in high-movement joints and structural bonding. Silicone provides better UV/heat resistance and mold resistance but is usually non-paintable and weaker in tensile strength/abrasion. PU suits construction & automotive; silicone for glazing & wet areas.
4. How long does polyurethane sealant last?
Polyurethane sealant like Supex PU 25 typically lasts 10–20 years in well-designed joints with proper application, surface prep, and moderate exposure. High-quality PU offers durable elasticity and weather resistance for construction/automotive uses, though lifespan shortens (5–10 years) under extreme UV, moisture, or movement stress. Regular inspection extends performance.
5. Can polyurethane sealant be used on wet surfaces?
No, standard polyurethane sealants like Supex PU 25 should not be applied on wet surfaces.
Supex PU Sealants are designed for durable bonding, sealing, and joint protection across automotive and construction industries. They provide excellent adhesion, flexibility, and resistance to vibration, temperature, and weathering.
Automotive Applications
Roof sealing and roof-bottom sealing for mica bonding
Roof gap sealing and side panel bonding
Floor bonding of plywood to steel or composite structures
Dashboard and driver cabin plywood bonding
Front and rear FRP bumper bonding
Battery box and FRP staircase sealing
Skirt panel bonding and cosmetic finishing
Sealing gaps between window frames
Structural bonding between ABS components and metal frames
Construction Applications
Expansion and concrete joint sealing
Precast structure joint sealing
General gap sealing and wall crack repair
Sealing transition joints and movement joints
Filling and sealing gaps between window and door frames and adjoining walls
Ensure the surface is clean, dry, and free from dust, grease, or loose particles before applying the PU sealant.
Perform a preliminary compatibility test on the substrates to confirm suitability before full-scale application.
Apply the sealant evenly along the joint. Use masking tape to define clean application lines, and remove the tape before the sealant cures.
Maintain a joint width-to-depth ratio of 2:1 for optimal performance.
Use backing materials (such as backer rods or bond breakers) where joint adjustment is required.
Ensure the sealant adheres only to two surfaces of the joint to allow proper flexibility and movement accommodation.
| Property | Value |
|---|---|
| Chemical Base | Polyurethane |
| Curing Mechanism | Atmospheric Moisture |
| Specific Gravity | 1.30 ± 0.03 |
| Tack-Free Time | 30–60 min |
| Cure Rate | 2 mm / 24 hours |
| Hardness (ASTM D 53505) | 40 ± 5 Shore A |
| Elongation at Break (DIN 53504) | ≥ 400% |
| Modulus at 100% (DIN 53504) | > 0.4 MPa |
| Tensile Strength | 1.1 N/mm² |
| Weight | 15kg |
|---|---|
| Dimensions | 42 × 20 × 24 cm |
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