Our Moisture-Curing Polyurethane Waterproof Coating is a reactive, liquid-applied elastomeric membrane engineered for heavy-duty structural waterproofing. Formulated with an ether-based polyurethane prepolymer backbone, the material cross-links upon contact with ambient humidity or concrete substrate moisture. It cures into a seamless, monolithic, rubber-like barrier that accommodates dynamic structural movement.
Designed as an alternative to pre-formed sheet membranes, this chemical-curing system eliminates lap-joint failures, withstands permanent water immersion, and complies with rigorous international building standards for roofs, podiums, and subterranean structures.
Technical Specifications
|
Property |
Test Method / Standard |
Typical Value |
|
Chemical Base |
- |
Polyether-based Polyurethane Prepolymer |
|
Solid Content |
ASTM D2697 / ISO 3251 |
>= 88% |
|
Tensile Strength |
ASTM D412 / ISO 37 |
>= 2.5 MPa |
|
Elongation at Break |
ASTM D412 / ISO 37 |
>= 600% |
|
Adhesion to Concrete |
ASTM D4541 / EN 1542 |
>= 1.5 MPa (Concrete substrate cohesive failure) |
|
Tear Resistance |
ASTM D624 |
>= 25 N/mm |
|
Shore A Hardness |
ASTM D2240 |
65 - 75 |
|
Tack-Free Time (25°C, 50% RH) |
ASTM C679 |
4 - 8 hours |
|
Service Temperature Range |
- |
-40°C to +90°C |
|
Crack Bridging Ability |
ASTM C836 / EN 1062-7 |
>= 2.0 mm without film rupture |
|
Regulatory Compliance |
CE Mark (EN 1504-2), ASTM C836, ISO 9001, ISO 14001, LEED VOC Compliant |
- |
Key Features
Hydrolytic Stability: Polyether backbone resists alkaline hydrolysis, making it suitable for permanent submersion in water tanks, pools, and below-grade structures.
Substrate Moisture Tolerance: Cross-links reliably on damp, newly stripped concrete substrates (up to 5% moisture content) without causing extensive bubbling or delamination.
Seamless Monolithic Integration: Forms a continuous elastomeric skin, removing weak points at complex detailing nodes, pipe penetrations, and flashing corners.
Low-Temperature Flexibility: Maintains elasticity down to -40°C without embrittlement, preventing winter cracking in alpine or northern climates.
Application Flexibility: Installs via airless spray equipment, notched squeegee, or heavy-duty rollers depending on project scale.
Application Areas
Roofing & Podium Decks: Exposed flat roofs, inverted roof assemblies, and podium parking slabs.
Subterranean Engineering: Foundation walls, basement slabs, elevator pits, retaining walls, and tunnel linings.
Civil Infrastructure: Bridge decks, utility vaults, and sewage treatment containment structures.
Wet Rooms: Commercial kitchens, wet areas, balconies, and swimming pool shells.
Product Selection Guide
|
Grade Designation |
Recommended Substrate & Scope |
Primary Performance Advantage |
Application Technique |
|
PU-S10 (Spray Grade) |
Large-scale roofing, tunnels, and open decks |
Low viscosity for high daily output and uniform film build |
Airless plural-component spray |
|
PU-R20 (Trowel/Roller Grade) |
Parapets, detailing flashings, vertical walls |
Thixotropic, non-sag behavior on vertical surfaces |
Notched squeegee, roller, or brush |
|
PU-H30 (Traffic Bearing) |
Parking decks, heavy industrial walkways |
Reinforced surface hardness, puncture resistance |
Multi-layer aggregate broadcast system |
OEM & ODM / Customization
We offer flexible contract manufacturing and private labeling services designed for international distributors and coating brands:
Rheology Modification: Viscosity tuning optimized for local contractor preferences (manual roller application vs. high-pressure machine spraying).
Curing Speed Adjustments: Catalytic packages tailored for fast turnaround in cold climates or extended open time in tropical heat.
Pigmentation: Standard slate grey, black, and white; custom RAL color matching available alongside UV-resistant aliphatic topcoat options.
Packaging & Private Label: Steel pails (20kg / 25kg), drums (200kg), or IBC totes featuring custom brand stenciling, barcode labeling, and localized Technical Data Sheets (TDS).
Manufacturing & Quality Control
Production takes place in an ISO 9001 and ISO 14001 certified facility utilizing closed-loop vacuum reactor systems to eliminate moisture contamination during prepolymer synthesis.
Raw Material Verification: Incoming polyether polyols and MDI undergo strict Fourier-transform infrared spectroscopy (FTIR) testing.
In-Process Moisture Control: Anhydrous reaction vessels maintain internal moisture parameters below 0.05% throughout synthesis to prevent premature gelling.
Batch Release Testing: Every production batch undergoes laboratory testing for solid content, Brookfield viscosity, and tensile properties. Retained samples are archived for 24 months for traceability.
Packaging & Storage
Packaging: Hermetically sealed metal pails (20kg / 25kg net) and steel drums (200kg net), nitrogen-blanketed to prevent premature skinning.
Shelf Life: 12 months from the date of manufacture in unopened, original containers.
Storage Environment: Store indoors in dry, well-ventilated spaces between +5°C and +30°C. Protect from direct sunlight, moisture exposure, and ignition sources.
FAQ
Q: How does moisture-curing differ from solvent-evaporation systems?
A: Moisture-curing prepolymers react chemically with ambient humidity or substrate moisture to cross-link. This allows the film to cure densely without relying entirely on solvent evaporation, reducing shrinkage and voids.
Q: What is the maximum allowable concrete substrate moisture level?
A: A maximum moisture content of 4% - 5% is recommended. For substrates exceeding this limit, an epoxy vapor-barrier primer must be applied first to prevent vapor-pressure blistering.
Q: Can this coating be applied directly over existing asphalt or bitumen membranes?
A: Direct application over fresh or plasticizer-rich asphalt is discouraged due to potential softening. A dedicated polyurethane-compatible sealing primer must be used as a separation layer.
Q: What is the standard MOQ for private label OEM orders?
A: The baseline MOQ for custom packaging and branded labeling is 1,000kg per formulation, subject to annual volume framework agreements.
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