Polyurethane coatings
PU PRIMER
One-Component Polyurethane Primer
Reactive moisture-curing substrate primer
A penetrating primer that reinforces porous substrates and improves adhesion beneath polyurethane waterproof coatings.
Product overview
Product overview and technical properties.
This one-component polyurethane waterproofing primer is a reactive moisture-curing polymer primer made from isocyanate and polyether polyol as the main raw materials, with selected additives introduced through polymerization. When rolled or brushed onto the prepared substrate, the -NCO end groups in the polyurethane prepolymer react with moisture in the air to form a tough, dense and seamless rubber-like coating film on the surface.
Technical data
Product classification and specification
| Item | TDS value |
|---|---|
| Type | Single-component |
| Physical state | Liquid |
| Color | Orange-red transparent |
| Density | 1.05 ± 0.05 kg/L |
| Open time | 2-3 h |
| Package | 10 or 20 kg iron barrel |
| Reference film thickness | 0.1 mm |
| Reference dosage | Approx. 0.1 kg/m² |
Technical data
Technical standard
Test conditions: 23°C ± 2°C and 50% ± 10% relative humidity.
| Test item | Technical specification |
|---|---|
| Viscosity | Specified value ±30% |
| Surface-drying time | ≤3 h |
| Actual-drying time | ≤5 h |
| Solid content | ≥90% |
| Bond strength | ≥1.5 MPa |
| Volatile organic compounds (VOC) | ≤120 g/L |
| Free TDI | ≤0.1 g/kg |
| Benzene + toluene + ethylbenzene + xylene | ≤200 mg/kg |
| Anthracene | ≤10 mg/kg |
| Naphthalene | ≤10 mg/kg |
| Phenol | ≤10 mg/kg |
Product features
Performance and advantages
Single-component, ready to use and convenient to apply
Enhances the bond between polyurethane waterproof coating and the substrate
Penetrates and reinforces loose or porous substrates with surface dust
The coating film provides good water, corrosion and bacteria resistance
Typical application areas
Where this product fits
Primer for polyurethane waterproof coating systems
Metal-surface corrosion protection, maintenance and surface treatment
Concrete surface reinforcement and moisture or seepage protection
Bridge, steel-structure and engineering corrosion protection
Transport and Storage
Packaged in sealed iron drums with lids; store in a dry, ventilated place.
Keep away from fire and protect from sunlight, rain and collision; transport and store at 5–40°C with ventilation.
Shelf life is 12 months; material beyond this period may be used only after passing re-inspection.
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