Hardtop Alfa Anti-mould Polyurethane Topcoat is a polyurethane coating used as a topcoat. Industrial protective coatings segment: typically used in environments requiring resistance to fungal and algal growth. This is a two-component chemically cured aliphatic acrylic polyurethane coating. Parameters on this page: volume solids 64 ± 2%, dry film thickness 50–100 µm, theoretical spreading rate 12.8–6.4 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 Clear Polyurethane Varnish.
Parameter source: JOTUN original technical data sheet (TDS) for Hardtop Alfa Anti-mould Polyurethane Topcoat; values such as spreading rate are converted from TDS parameters and are for model 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 | 64 ± 2% |
|---|---|
| Dry Film Thickness | 50–100 µm |
| Theoretical Spreading Rate | 12.8–6.4 m²/L |
| VOC | 311 g/L (China) |
| Density / Specific Gravity | 1.4 kg/L |
| Number of Components | Two-component |
| Flash Point | 30 °C |
| Thinner | JOTUN Thinner No. 10 |
| Mixing Ratio | 8 parts : 1 part (by volume) |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
Hardtop Alfa
This is a two-component chemically cured aliphatic acrylic polyurethane coating. Its film has a gloss surface with good gloss retention. It provides resistance to fungal and algal growth. It is a high-solids product. It has good application properties and a low tendency to dry spray. Used as a topcoat in atmospheric environments.
Industrial protective coatings:
Typically used in environments requiring resistance to fungal and algal growth. Recommended for wind turbine towers (interior), power stations, power plants and substations.
Others
Certified in accordance with HG/T 3950, ASTM D5590 and GB/T 1741. Other certificates and approvals available on request.
Limited number of colours
| Property | Test / Standard | Description |
| Volume Solids | ISO 3233 | 64± 2 % |
| Gloss (GU 60°) | ISO 2813 | Gloss (70–85) |
| Flash Point | ISO 3679 Method 1 | 30 °C |
| Density | Theoretical Value | 1.4 kg/L |
| Region | Regulations | Test / Standard | VOC Value |
| China | GB 30981-2020 Limit of harmful substances of industrial protective coatings | GB/T 23985-2009 8.3 | 311 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 |
|---|
VOC - China (GB/T 23985-2009 (ISO 11890-1) theoretical value): 336 g/L
Typical recommended specification range
| Dry Film Thickness | 50–100 µm |
| Wet Film Thickness | 80–160 µm |
| Theoretical Spreading Rate | 12.8–6.4 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: | usable. Take care to achieve the specified dry film thickness. |
| Mildew-resistant Polyurethane Topcoat, Component A | 8 parts |
| Mildew-resistant Polyurethane Topcoat, Component B | 1 part |
| Thinner | JOTUN Thinner No. 10 |
|---|
In China, the cleaning solvent must comply with GB 38508-2020
| Nozzle tip size (inch/1000): | 13-19 |
| Nozzle pressure (minimum): | 150 bar/2100 psi |
| Nozzle tip size: | HVLP: 11–19 (inch/1000) / pressure pot: 1.1–1.9 (mm) |
| Nozzle pressure (minimum): | HVLP: 2.1 bar/30 psi / Pressure pot: 2.1 bar/30 psi |
| Substrate Temperature | 5 °C | 10 °C | 23 °C | 40 °C |
| Touch Dry | 16 h | 6 h | 3.5 h | 2 h |
| Walk-on Dry | 24 h | 14 h | 7 h | 4 h |
| Minimum recoat interval | 24 h | 14 h | 7 h | 4 h |
| Dry/cured to service | 21 days | 14 days | 7 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 |
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 |
|---|
| Volume | Container Size | |
| (L) | ||
| Mildew-resistant Polyurethane Topcoat, Component A | 4.44 / 17.8 | 5 / 20 |
| Mildew-resistant Polyurethane Topcoat, Component B | 0.56 / 2.2 | 1 / 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.
| Mildew-resistant Polyurethane Topcoat, Component A | 48 months |
| Mildew-resistant Polyurethane Topcoat, 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.
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.
