Hardtop WT8 High-performance Polyurethane Topcoat WT8 is a polyurethane coating for use as a topcoat. Industrial protective coatings segment: suitable for wind turbine towers. It is a semi-gloss topcoat with good gloss retention. Parameters on this page: volume solids 62 ± 2%, dry film thickness 50–100 µm, theoretical spreading rate 12.4–6.2 m²/L. Comparable models from the same brand: Hardtop AX K II Aliphatic Polyurethane Topcoat AX K II, Hardtop AX Aliphatic Polyurethane Topcoat AX, Hardtop Alfa Anti-mould Polyurethane Topcoat.
Parameter source: JOTUN original technical data sheet (TDS) “Hardtop WT8 High-performance Polyurethane Topcoat WT8”; values such as spreading rate are converted from TDS parameters and are for 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 | 62 ± 2% |
|---|---|
| Dry Film Thickness | 50–100 µm |
| Theoretical Spreading Rate | 12.4–6.2 m²/L |
| VOC | 315 g/L (China) |
| Density / Specific Gravity | 1.4 kg/L |
| Number of Components | Two-component |
| Flash Point | 28 °C |
| Thinner | Jotun Thinner No. 10 |
| Mixing Ratio | 5 parts : 1 part (by volume) |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
Hardtop WT8
This is a two-component chemically curing polyurethane coating. It is a semi-gloss topcoat with good gloss retention. It has good chemical resistance. It is a high-solids product.
Industrial protective coatings:
Suitable for wind turbine towers. Widely suitable for industrial buildings.
Others
Light grey
| Property | Test / Standard | Description |
| Volume Solids | ISO 3233 | 62± 2 % |
| Gloss (GU 60°) | ISO 2813 | Semi-gloss (55–70) |
| Flash Point | ISO 3679 Method 1 | 28 °C |
| Density | Theoretical Value | 1.4 kg/L |
| Region | Regulations | Test / Standard | VOC Value |
| US | CARB(SCM)2020 / SCAQMD rule 1113 | Calculation | 328 g/L |
| Hong Kong | Air Pollution Control (VOC) Regulation | Calculation | 328 g/L |
| EU | European Paint Directive 2004/42/CE | Calculation | 328 g/L |
| China | GB 30981-2020 Limit of harmful substances of industrial protective coatings | GB/T 23985-2009 8.3 | 315 g/L |
The data listed are based on factory batch production and may vary slightly with colour.
| Gloss description | According to JOTUN's definition of functional coatings |
|---|
Typical recommended specification range
| Dry Film Thickness | 50–100 µm |
| Wet Film Thickness | 80–160 µm |
| Theoretical Spreading Rate | 12.4 – 6.2 m²/L |
Surface Preparation
| Substrate | Minimum | Recommended |
| Coated surface | A clean, dry and sound compatible primer. | |
This product may be applied by the following methods
| Spray: | Apply by air spray or airless spray. |
| Brush: | Recommended for touch-up and small-area application. Take care to achieve the specified dry film thickness. |
| Roller: | Suitable. With roller application, take care to apply sufficient material to achieve the specified dry film thickness. |
| Hardtop WT8 Comp A — High-Performance Polyurethane Topcoat WT8, Component A | 5 parts |
| Hardtop WT8 Comp B — High-Performance Polyurethane Topcoat WT8, Component B | 1 part |
| Thinner: | Jotun Thinner No. 7 | /Jotun Thinner No. 10 |
| JOTUN Thinner No. 7 | JOTUN Thinner No. 10 / Jotun Thinner No. 68 |
JOTUN Thinner No. 68 is intended for use in high-temperature application environments to extend the touch-dry time of the film and reduce dry spray. The maximum recommended addition is 10% by volume of the mixed paint.
JOTUN Thinner No. 63 is intended for use where a reduction in drying time is required. The maximum recommended addition is 5% by volume of the mixed paint.
| Note | The pot life of the paint is reduced accordingly after the addition of Thinner No. 63. |
|---|
| Nozzle tip size (inch/1000): | 13-19 |
| Nozzle pressure (minimum): | 150 bar/2100 psi |
| Nozzle tip size: | Gravity gun: 1.6–1.8 (mm) / pressure pot: 1.4–1.6 (mm) |
| Nozzle pressure (minimum): | Gravity gun: 3.2 bar / pressure pot: 3.2 bar |
| Pressure pot pressure: | 1.6 bar |
| Substrate Temperature | 0 °C | 5 °C | 10 °C | 23 °C | 40 °C |
| Touch Dry | 4 h | 3 h | 2 h | 1 h | |
| Walk-on Dry | 40 h | 24 h | 16 h | 8 h | 4 h |
| Minimum recoat interval | 24 h | 18 h | 10 h | 5 h | 3 h |
| Dry/cured to service | 20 days | 14 days | 10 days | 5 days | 3 days |
For the maximum recoat interval, refer to the Application Guide (AG) for this product.
Drying and curing times are determined based on temperature and relative humidity below 85%, with dry film thickness within the average range.
| Touch Dry | The state at which light finger pressure leaves no mark or stickiness. |
|---|---|
| Walk-on Dry | The minimum time after which the coating allows normal foot traffic without leaving permanent footprints, marks or other physical damage. |
Minimum recoat interval after drying: the recommended minimum interval before applying the next coat.
Dry/cured to service: the minimum time before the coating can be permanently exposed to a specific environment/medium.
| Paint temperature | 23 °C |
| Pot Life | 1.5 h |
Temperature
| Continuous | Peak | |
| Drying, atmospheric | 120°C | 140 °C |
Resistant to spillage of most oils, aliphatic petroleum products and non-aggressive chemicals.
Withstands peak temperatures for a maximum of one hour.
At the above temperatures, protective performance is unaffected, but appearance may be affected.
Depending on the actual exposure conditions in service, this product may be used with various primers and topcoats. Some reference systems are listed below. For specific systems, contact JOTUN.
| Previous coat: | Epoxy, zinc epoxy, modified epoxy, polyurethane |
| Subsequent coat: | Polyurethane |
| Volume | Container Size | |
| (L) | ||
| Hardtop WT8 Comp A — High-Performance Polyurethane Topcoat WT8, Component A | 16.7 | 20 |
| Hardtop WT8 Comp B — High-Performance Polyurethane Topcoat WT8, Component B | 3.3 | 5 |
The packaging sizes above are typical reference sizes for factory batch production. Due to regional regulatory differences, packaging sizes and capacities may vary by region.
Store in accordance with national regulations. Keep containers in a dry, cool, well-ventilated place away from heat and sources of ignition. Keep containers tightly closed. Handle with care.
| Hardtop WT8 Comp A — High-Performance Polyurethane Topcoat WT8, Component A | 48 months |
| Hardtop WT8 Comp B — High-Performance Polyurethane Topcoat WT8, Component B | 48 months |
In some markets, the stated shelf life may be shortened to comply with local legal requirements. The above is the minimum shelf life; thereafter, testing is required to confirm quality remains acceptable.
This product can contribute to green building standard credits. Visit Jotun.com for more information or contact your local JOTUN representative.
EPDs are available at www.epd-norge.no
For professional use only. Applicators and workers must be trained, experienced, capable and equipped to mix, stir and apply the coating correctly in accordance with JOTUN's technical documents. Applicators and workers must wear appropriate personal protective equipment when using this product. This guidance is provided based on current product knowledge. Any proposed modification to suit site conditions must be approved by the responsible JOTUN representative before use.
Read the safety warnings on the container packaging. Use in well-ventilated conditions. Avoid inhaling spray mist and avoid skin contact. In case of accidental splashes on skin, wash immediately with a suitable cleaner, soap and water. In case of eye contact, rinse thoroughly with water and seek medical attention immediately.
When used primarily as a primer or antifouling coating, products may show slight colour variation from batch to batch. Such products, and epoxy products used as topcoats, may chalk when exposed to sunlight.
Gloss and colour retention of topcoats depend on the colour type, the surrounding environment such as temperature and UV intensity, application quality and product type. Contact your local JOTUN office for further information.
The information in this datasheet is based entirely on knowledge gained in our laboratory and in practice. JOTUN products are regarded as semi-finished products, and their use is generally beyond our control. JOTUN therefore guarantees only the quality of the product itself. To comply with local regulations, the product may be adjusted, and we reserve the right to modify the datasheet without further notice.
Users should consult JOTUN for specific guidance on the suitability of the product for their requirements and applications.
In case of any discrepancy between language versions, the English (UK) version shall prevail.
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.
