HI-AQU 8660 Water-borne Polyurethane Topcoat is a water-borne paint for use as a topcoat. As an environmentally acceptable water-borne weather-resistant topcoat with high corrosion protection performance, it provides long-term corrosion protection and gloss/colour retention for new construction and maintenance steel structures in medium to high corrosivity atmospheric environments. It is suitable for bridges, petrochemical, municipal engineering, power industry, port machinery, mining equipment and other industries. HI-AQU 8660 Water-borne Polyurethane Topcoat is a two-component water-borne high-gloss weather-resistant aliphatic acrylic polyurethane topcoat with high corrosion protection performance in coating systems and application properties. Parameters on this page: volume solids 47 ± 2%, DFT 30–60 µm, theoretical spreading rate 9.4 m²/L.
Parameter source: Nippon Paint Industrial (NIPPON INDUSTRIAL) manufacturer technical data sheet (TDS) 'HI-AQU 8660 Water-borne Polyurethane Topcoat'; values such as spreading rate are converted from TDS parameters and are for product selection reference only.
The above content is compiled from the manufacturer's datasheet and this site's parameter tables. For selection, coating systems and lead times, pleaseContact Usfor confirmation.
This page carries the full TDS for this product, translated from the manufacturer's original document. No file download is needed; for an original-language copy, send an enquiry.
| Volume Solids | 47 ± 2% |
|---|---|
| Dry Film Thickness | 30-60µm |
| Theoretical Spreading Rate | 9.4 m2/l |
| VOC | 120 g/L The surface to be coated shall be clean, dry and free from contamination. Surface assessment and cleaning shall refer to IS… |
| Density / Specific Gravity | 1.23 ± 0.1 kg/L (varies slightly with colour) |
| Number of Components | Two-component |
| Thinner | Deionised water |
| Mixing Ratio | Base : curing agent = 6:1 (by weight) |
| Colour / Appearance | Various colours (standard industrial colour chart or custom colours) |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
HI-AQU 8660 Water-borne Polyurethane Topcoat is a two-component water-borne high-gloss weather-resistant aliphatic acrylic polyurethane topcoat with high corrosion protection performance in coating systems and application properties.
As an environmentally acceptable water-borne weather-resistant topcoat with high corrosion protection performance, it provides long-term corrosion protection and gloss/colour retention for new construction and maintenance steel structures in medium to high corrosivity atmospheric environments. It is suitable for bridges, petrochemical, municipal engineering, power industry, port machinery, mining equipment and other industries.
| Colour | Various colours (standard industrial colour chart or custom colours) |
|---|
| Gloss (60°) | High gloss |
|---|---|
| Solids content (by volume) | 47±2% |
| Density | 1.23 ± 0.1 kg/L (varies slightly with colour) |
| VOC | 120 g/L The surface to be coated shall be clean, dry and free from contamination. Surface assessment and cleaning shall refer to ISO8504. Oil and |
Remove oil and grease in accordance with SSPC-SP1 solvent cleaning.
The surface of applied primer/intermediate coat shall be clean, dry and compatible with the primer/intermediate coat, and application shall be within the overcoating interval, or the previous coat shall be surface prepared to meet overcoating requirements.
Repair of damaged areas: damaged areas must be abrasive blast cleaned to Sa21/2 (ISO 8501-1:2007) or SSPC-SP6 (for desired performance, blast clean to SSPC-SP10). If local areas cannot be blast cleaned, mechanical abrading to St3 (ISO 8501-1:2007) is permitted. After surface preparation, apply according to the recommended coating system.
Before application of HI-AQU 8660, ensure the surface to be coated is clean and dry. Application must be carried out within the specified recoat interval (refer to the relevant product application instructions).
Other surfaces: if this coating is to be applied to other surfaces, consult the Nippon Paint Industrial Coatings Protective Coatings division.
Application is not recommended at ambient temperatures below 5 °C or above 50 °C, or relative humidity above 75%; steel
The temperature should be at least 3 °C above the dew point of the surrounding air.
| Mixing ratio | Base : curing agent = 6:1 (by weight) |
|---|
Base and hardener must be mixed thoroughly before use.
| Pot life | 3 h (25 °C) |
|---|
Once mixed, use within the pot life.
| Theoretical Spreading Rate | 9.4 m²/L (calculated at 50 µm DFT) |
|---|---|
| Thinner | Deionised water |
Roller/brush/conventional air spray: suitable for stripe coating and small-area application.
Air-assisted airless spray: suitable for large-area application.
Regardless of the method used, the specified dry film thickness must be achieved.
| Air Spray | Nozzle size: 1–2 mm; air pressure: 0.3–0.5 MPa |
|---|---|
| Airless Spray | Tip size: 0.013"–0.017"; nozzle pressure: above 150 bar |
| Typical film thickness | 30–60 µm DFT: 64–127 µm WFT Drying time |
| Substrate Temperature | 5°C | 15°C | 25°C | 40°C |
| Touch dry time | 120min | 100min | 60min | 30min |
| Hard dry time | 22h | 18h | 8h | 4h |
| Fully cured | 21d | 14d | 7d | 3d |
| Minimum recoat time | 22h | 18h | 8h | 4h |
| Maximum recoat time* | - | |||
Note: *the surface must be free of chalking and contamination before recoating. Prolonged outdoor exposure, a smooth surface or contamination adversely affects recoat adhesion; the surface must therefore be roughened, sweep blasted or high-pressure water jetted to ensure adequate adhesion.
The data above are for guidance only. Actual recoat and drying times may be shorter or longer depending on film thickness, ventilation, humidity, coating system, and prior hand or mechanical preparation conditions.
The following products are recommended for use with HI-AQU 8660 Water-borne Polyurethane Topcoat
Primer
Intermediate Coat
Select the coating system according to the specific requirements; refer to the product manual or contact Nippon Paint for professional guidance.
Packaging; curing agent
| Unit weight | Base packaging size | Base weight | Base packaging size | |
| 21 Kg | 18 Kg | 20 L | 3 Kg | 5 L |
| Storage; shelf life (from date of production) | Base: 6 months (25°C) |
|---|
Hardener: 6 months (25°C) Store in accordance with national regulations. The product shall be kept sealed in a dry, cool and well-ventilated warehouse, away from heat and ignition sources. The above is the minimum shelf life; after expiry, testing is required to determine whether continued use is acceptable.
All information in this product data sheet is based on laboratory tests and practical experience. However, since the product is subject to many unforeseeable and uncontrollable factors in actual use, we guarantee only the quality of the product itself. Read this data sheet carefully and confirm with Nippon Paint that it is the latest version before using the product.
We reserve the right to modify this product data sheet without prior notice.
Information is subject to the manufacturer's latest version; the manufacturer's latest TDS prevails.
The technical parameters on this page are taken from the product's original manufacturer technical datasheet, the copyright of which belongs to the manufacturer. If a rights holder considers the presentation inappropriate, contact us for verification and handling.
Packaging specifications and batch lead times are subject to actual availability. PleaseContact Uscontact us for project-based calculation.
