HI-THANE 6658 Polyurethane Topcoat is a polyurethane coating for topcoat use. The product has low VOC content, high spreading rate, good sag resistance, and high application efficiency; the film offers long-term gloss and colour retention and long-term recoatability. Parameters on this page: volume solids 65 ± 3% (varies slightly with colour), dry film thickness 40–60 µm, theoretical spreading rate 0.10–0.12 kg/m².
Parameter source: NIPPON INDUSTRIAL manufacturer's Technical Data Sheet (TDS) "HI-THANE 6658 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 | 65 ± 3% (varies slightly with colour) |
|---|---|
| Dry Film Thickness | 40-60µm |
| Theoretical Spreading Rate | 0.10-0.12 kg/m² |
| VOC | 306 g/L (mixed, white) |
| Density / Specific Gravity | 1.4 ± 0.1 kg/L (varies slightly with colour) |
| Number of Components | Two-component |
| Thinner | 0961 Thinner |
| Colour / Appearance | Various colours (standard industrial colour chart or custom colours) |
| Gloss | High gloss |
Product description: HI-THANE 6658 Polyurethane Topcoat is a general-purpose, high-build, two-component, weather-resistant, anti-corrosive polyurethane topcoat. The product has low VOC content, high spreading rate, good sag resistance, and high application efficiency; the film offers long-term gloss and colour retention and long-term recoatability.
Product use: As a general-purpose high-performance anti-corrosive, weather-resistant topcoat with strong overall performance, it is compatible with most Nippon Paint epoxy coating systems and is used for new construction and maintenance painting of outdoor steel structures in moderate- to high-corrosion atmospheric environments, such as bridges, petrochemical facilities, municipal projects, the power industry, port machinery, and offshore facilities.
| Colour | Various colours (standard industrial colour chart or custom colours) |
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Physical properties
| Gloss | High gloss |
|---|---|
| Solids content (by volume) | 65 ± 3% (varies slightly with colour) |
| Density | 1.4 ± 0.1 kg/L (varies slightly with colour) |
| VOC | 306 g/L (mixed, white) |
Surfaces to be coated shall be clean, dry, and free from contamination. Surface assessment and cleaning shall be in accordance with ISO 8504. Treatment of oily surfaces and grease removal shall be in accordance with SSPC-SP1 solvent cleaning.
For repair, damaged areas shall be blast-cleaned to Sa2½ (ISO 8501-1:2007). If blasting is not possible locally, mechanical grinding to St3 (ISO 8501-1:2007) is permitted. After surface preparation, repair according to the coating system sequence.
HI-THANE 6658 Polyurethane Topcoat shall be applied to surfaces to be coated in accordance with the anti-corrosive coating system recommended by Nippon Paint. Before application, ensure the surfaces to be coated are dry and free from contamination, and application must be carried out within the specified recoat interval (refer to the relevant product data sheet).
Other surfaces: if this coating is to be applied to other surfaces, consult the local Nippon Paint company for further information.
Application conditions: When the ambient temperature remains below 5°C or the relative humidity remains above 80%, the risk of condensation on the substrate increases and continued application is not recommended; the substrate temperature must be at least 3°C above the ambient dew point.
| Application guide — mixing | Base:Hardener = 11:1 (mass ratio) |
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The base and curing agent shall be mixed uniformly before use
| Pot life | 2 h (25 °C) |
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Once mixed, use within the pot life.
| Theoretical spreading rate | 0.10–0.12 kg/m² (based on 50 µm dry film) |
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| Thinner | 0961 Thinner; the amount of thinner added shall not exceed the range permitted by local regulations. |
Application methods: roller/brush/air spray, suitable for stripe coating and small-area application;
Airless spray: recommended for large-area application;
Regardless of the method used, the specified dry film thickness must be achieved.
| Application parameters — airless spray | Nozzle size: 0.015–0.019 in; nozzle pressure: 141– kg/cm² |
|---|---|
| Typical film thickness | 40–60 µm dry film thickness; 60–95 µm wet film thickness; drying time |
| Substrate Temperature | 10°C | 15°C | 25°C | 40°C |
| Touch dry time | 4h | 3h | 2h | 1h |
| Hard dry time | 32h | 24h | 12h | 4h |
| Minimum recoat time | 32h | 24h | 12h | 4h |
| Maximum recoat time* | - | |||
Note: *Before overcoating, the surface shall be free of chalking and contamination. When the film has been exposed outdoors for a long time and the surface is smooth or contaminated, overcoat adhesion may be affected; therefore the film surface shall be abraded, 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, the underlying coating system, and prior hand or mechanical preparation conditions.
The following primers/intermediate coats are recommended for use with HI-THANE 6658 Polyurethane Topcoat: Primer
Packaging
| Unit weight | Base packaging size | Hardener weight | Curing agent packaging size | |
| 24kg | 22kg | 18L | 2 kg | 4L |
| Shelf life (from date of production) | Base: 12 months (25 °C) |
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Storage Hardener: 12 months (25°C). Store in accordance with national regulations. The product is to be kept sealed in a dry, cool, well-ventilated warehouse, away from heat and ignition sources. Excessive temperature shortens the shelf life and may cause the paint to gel in the container. The above is the minimum shelf life; after expiry, testing is required to determine whether continued use is possible.
for the safety information.
Disclaimer: the above information is based on laboratory tests and application experience. As actual use is subject to many unforeseeable and uncontrollable factors, no application liability is assumed. Read this data sheet carefully and contact Nippon Paint before using the product to confirm that it is the latest version.
We reserve the right to make changes 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.
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
Packaging specifications and batch lead times are subject to actual availability. PleaseContact Uscontact us for project-based calculation.
The in-house item numbers of HI-THANE 6658 Polyurethane Topcoat are as follows.Item No.is the most accurate form when ordering;Colour/colour codecorresponds to the actual colour (RAL, GSB are colour chart codes);Packaging SpecificationsFactory complete-set specification format. Colors not listed may be ordered against the colour card.
| Item No. | Colour / colour code | Packaging Specifications |
|---|---|---|
| HI-THANE 6658 Grey | — | 24 KG |
This model has a total of1item numbers, all listed on this page; colours outside the table (including special colours and bulk packaging) can be confirmed by phone, delivery dates are advised according to the factory's current production schedule and stock. In the packaging specification, the "+" indicates the complete-set notation for two-component products (base + curing agent), subject to the factory specification; a "—" in the colour column denotes an auxiliary product, or that the item has no colour code in the factory system.
