Why Choose CHEMPU?
Superior Durability
High elasticity and low modulus properties perfectly adapt to structural displacement and vibration, maintaining seal integrity for extended periods.
Smart Application
The colloid is non-sagging and easy to smooth, supporting all-weather application; MS series can be directly painted after curing, significantly improving application efficiency.
Eco-Friendly & Safe
Non-corrosive and oil-free to natural stone or sensitive metals, making it the first choice for enclosed indoor spaces and high-standard building projects.
Factory Direct Strength
Years of experience at the Shanghai source factory, possessing a complete R&D, production, and quality control system.
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.
Polyurethane sealant（PU series）
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
Application scenarios
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
Polyurethane sealant（MS series）
Single-component and environmentally friendly: No mixing required, easy to apply, and non-toxic, odorless, and solvent-free after curing.
Excellent self-leveling: Excellent flowability, making grouting and smoothing operations extremely smooth and convenient.
Displacement and crack resistance: Adapts to high displacement without cracking or peeling, perfectly suited for concrete pavements.
Extremely easy to repair: Excellent compatibility between new and old adhesives, making post-repair maintenance very simple.
High elasticity and corrosion resistance: Over 800+ elongation for strong adhesion, waterproof, oil-resistant, acid and alkali-resistant, and puncture-resistant.
Application scenarios
Involving multiple building scenarios
- Bonding and sealing of joints and gaps in roads, airport runways, plazas, through-wall pipes, docks, roofs, underground garages, basements, etc.
Industrial Scene
- Sealing leaks in oil refineries and chemical plants
- Bonding and sealing of industrial floors, such as epoxy floors and various painted surfaces;
Compatible with multiple materials
- Excellent bonding, sealing, and repair effects on a variety of materials including concrete, wood, metal, PVC, ceramics, carbon fiber, and glass.
PU series parameters
| Parameter | PU30 | PU40 |
|---|---|---|
| Material | Polyurethane | Polyurethane |
| Cure time (Min) | 60-120 | 60-120 |
| Modulus | Low | High |
| Elongation at break (%) | 600 | 700 |
| Hardness (Shore A) | 30±5 | 40±5 |
| Shelf life (months) | 310ml cartridge in 12 months | 400ml & 600ml sausage in 9 months |
| Storage | Temperature in 5-25℃, Humidity in less 50%RH | Temperature in 5-25℃, Humidity in less 50%RH |
MS series parameters
| Parameter | SL100 |
|---|---|
| Material | Polyurethane |
| Viscosity (cps) | 25,000-35,000 |
| Density (g/cm³) | 1.30 |
| Elongation at break (%) | 1500 |
| Hardness (Shore A) | 20 |
| Shelf life (months) | 9 months |
| Storage | Temperature in 5-25℃, Humidity in less 50%RH |
You are welcome to contact us.
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.
