Construction & Industrial Sealants – High-Performance Bonding for Built Environments
CHEM PU provides a comprehensive range of polyurethane and MS (Modified Silane) sealants designed for demanding construction, infrastructure, and industrial applications. Our formulations deliver UV resistance, waterproof sealing, flexibility, and long-term durability—ensuring structural integrity and performance in challenging environments.
Why Choose CHEM PU Sealants?
✅ Weather & UV Resistant – Long-term performance under sun, rain, and temperature cycles
✅ Flexible & Elastic – Accommodates movement without cracking or shrinking
✅ Multi-Substrate Bonding – Adheres to concrete, metal, glass, plastic, and more
✅ Environmentally Friendly – Low VOC, odorless after curing, and non-corrosive
✅ Easy to Apply – One-component moisture-cure systems in cartridges and sausages
Key Application Areas
🏗️ Building & Construction
Expansion and settlement joints in buildings, plazas, and roads
Sealing of doors, windows, and curtain walls
Concrete through-holes and crack sealing
🌉 Infrastructure & Civil Engineering
Bridges, tunnels, airport runways, and dam waterproofing
Drainage pipelines, reservoirs, sewage systems, and tanks
🏭 Industrial Assembly & Maintenance
Sealing of prefabricated panels, stone, color steel plates, and epoxy floors
Bonding and sealing in automotive, rail, marine, and container applications
Product Series Overview
Flexible, durable, and weather-resistant sealants ideal for expansion joints, concrete sealing, and waterproofing applications.
PU-40: UV Resistant Weatherproof Sealant
Excellent aging resistance, low modulus, high elasticity. Ideal for outdoor joints, bridges, tunnels, and building exteriors.
→ Learn MorePU-30: General Purpose Polyurethane Sealant
Easy to apply, environmentally friendly, with good oil and water resistance. Suitable for interior and exterior sealing.
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Multi-purpose, paintable, and highly compatible sealants offering the combined benefits of polyurethane and silicone technologies.
MS-50: Medium Modulus Multi-Purpose MS Sealant
Low VOC, primerless, UV resistant, and suitable for a wide range of substrates including metals, plastics, glass, and concrete.
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Have a Sealing Challenge?
Whether you’re sealing a stadium roof, a water treatment facility, or an industrial floor—CHEM PU has a solution.
Contact us today for product selection support, samples, or a quote.
A: PU (Polyurethane) sealants are known for their flexibility, weather resistance, and elasticity, ideal for outdoor joints and waterproofing. MS (Modified Silane) sealants offer wider substrate compatibility, paintable surfaces, and low VOC, making them suitable for both structural bonding and sealing in sensitive environments.
A: We recommend PU-40 for its UV resistance, high elasticity, and durability in outdoor concrete joints. For indoor or painted surfaces, MS-50 is also an excellent choice due to its paintable finish and strong adhesion.
A: Surfaces must be clean and dry before application for optimal adhesion. Moisture-curing occurs after application, but surface moisture can affect bond strength.
A: Cure time depends on temperature, humidity, and sealant depth.
Surface tack-free: 15–60 minutes
Full cure: 24–72 hours
MS-50 typically cures faster in humid conditions.
A: Most CHEM PU sealants are primerless for common substrates like concrete, metal, and glass. In specific cases (e.g., porous or contaminated surfaces), a primer may enhance adhesion. Check the product TDS for details.
