Supex PU 40 Polyurethane sealant
Why Bus body Polyurethane Sealants ?
Bus body manufacturers often face challenges with sealing and bonding materials that fail to withstand harsh environments. Issues like water ingress, vibration, and thermal expansion can cause sealants to crack, lose adhesion, or degrade over time, compromising the vehicle’s structural integrity and passenger safety.
When these sealants fail, it leads to costly repairs, downtime, and customer dissatisfaction. Water leaks, rust, and reduced vehicle durability can damage the brand’s reputation. Additionally, vibrations and inadequate bonding create noise and reduce the comfort of passengers, making it difficult to maintain quality standards in bus manufacturing.
Supex polyurethane sealants, EG: Supex PU 40, provides a durable, flexible solution designed specifically for bus body construction. It offers:
- High Adhesion: Bonds reliably to metal, glass, and composite materials.
- Weather Resistance: Withstands extreme temperatures, UV rays, and moisture.
- Vibration Absorption: Reduces noise and enhances passenger comfort.
- Long-Term Durability: Prevents cracking, peeling, and water ingress for years.
Supex PU 40 is a high-quality multipurpose non-sag one-part PU sealant that cures on exposure to atmospheric moisture to form a durable elastomer. These polyurethane sealants have been especially developed for Indian subtropical conditions. Most suitable in high temperature & extreme humid conditions. Usage mostly in Bonding & sealing for Bus Body, Rail Coaches, expansion joint sealing and other automotive / construction applications.
Technical Data
- Chemical Base: Polyurethane
- Curing Mechanism: Atmospheric Moisture
- Specific gravity(DIN 53479) 1,3 ± 0,03 g/cm3
- Tack free time: 30-60 min.
- Cure Rate 2 mm/24 hour
- Hardness (ASTM D 53505): 40±5 Shore A
- Elongation at Break(DIN 53504): ≥ 300%
- Modulus 100 % (DIN 53504): >0,4 Mpa
- Tensile Strength: 1.2 N/mm2
Features & benefits of Supex PU 40
- polyurethane sealants react with moisture to cure
- Characteristics: High gap filling , High Bonding strength , Flexibility , Chemical Resistance , Paintable
- Bonds well to a wide variety of substrates
- Overpaintable and has non sag consistency
- Suitable for making permanent elastic seals of high adhesive strength
- Vibration and sound dampening properties
- Excellent resistance to many chemicals
- Developed specifically for automotive and bus industry, bodywork & container applications
- Good resistance to ageing & weathering – thus, suitable for indoor and outdoor applications
- Sandable & over-paintable with many water, solvent based paints
Typical Automotive applications with Supex PU sealant, Supex PU 40
- Roof sealing, roof bottom sealing for mica bonding
- Roof gap sealing
- Side panel
- Floor bonding with plywood
- Dash board bonding
- Plywood bonding in Driver’s cabin
- Rear FRP & FRP bumper, front FRP
- Battery box sealing
- FRP staircase sealing
- Skirt panel bonding
- Gaps between window frames
- Plywood to steel structure
- ABS to frame
Polyurethane sealants are also used in Elevator, Escalator – metal to metal bonding applications, Eg: panel stiffner bonding
Best Industrial PU Sealant in India
PU adhesive sealants uses
- polyurethane sealants are popular for automotive bonding & sealing applications
- General coach-building, caravans & motor-homes assembly as well as repairing
- Bus Body & truck industries
- Thermal & acoustic insulation technology in refrigeration, air-conditioning
- Suitable substrate materials include timber, metals, particularly aluminium, sheet steel, metal primers, paint coatings, ceramic materials as well as plastics
- Joint sealing for construction applications, Eg: expansion joints
Metal to Metal Bonding & Sealing
Polyurethane sealants possesses excellent adhesion to sheet iron, aluminum, stainless steel, lead, copper, ceramic, glass, wood and various plastic materials.
- Body construction of cars, containers, caravans etc.
- Sealing and bonding of ventilation ducts, gutters and spouts etc.
- Sealing of sheet metal seams
- For vibration reduction in all type of sheet metal assembly works
- Sealing against water, air, gas and dust.
