SteelMaster 120WB Interior Intumescent Steel Fire Protection Coating is a fire protection coating. Designed to protect a wide range of I-beams, columns and hollow steel sections, suitable for steel structures exposed to interior environments. Independently certified for fire protection of structural steel exposed to cellulosic fires. Parameters on this page: volume solids 73 ± 4%; dry film thickness 220–730 µm; number of components: one. Comparable products from the same brand: Jotachar 1709 XT Epoxy Intumescent Coating, Jotachar 1709 Exterior Intumescent Steel Fire Protection Coating, Jotachar JF750 XT Epoxy Intumescent Coating.
Source: JOTUN original technical data sheet (TDS) 'SteelMaster 120WB Interior Intumescent Steel Fire Protection Coating'. Spreading rate and other values converted from the TDS; for 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 | 73 ± 4% |
|---|---|
| Dry Film Thickness | 220–730 µm |
| Theoretical Spreading Rate | — |
| VOC | 10 g/L (China) |
| Density / Specific Gravity | 1.4 kg/L |
| Number of Components | One-component |
| Flash Point | 101 °C |
| Thinner | Fresh water |
| Wet Film Thickness | 300–1000 µm |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
SteelMaster 120WB
This is a single-component, thin-film intumescent water-borne acrylic coating. Independently certified for fire protection of structural steel exposed to cellulosic fires. In atmospheric environments, it may be used as an intermediate coat or topcoat. Suitable for carbon steel substrates coated with an approved primer.
Specially designed as a reactive fire protection system for steel structures. Designed to protect a wide range of I-beams, columns and hollow steel sections, suitable for steel structures exposed to interior environments. Contact the local Jotun representative for detailed application procedure documents.
Others
Chinese GB 14907:2018. Other certificates and approvals are available on request.
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| Property | Test / Standard | Description |
| Volume Solids | ISO 3233 | 73± 4 % |
| Flash Point | ISO 3679 Method 1 | 101 °C |
| Density | Theoretical Value | 1.4 kg/L |
| Region | Regulations | Test / Standard | VOC Value |
| US | CARB(SCM)2020 / SCAQMD rule 1113 | Calculation | 22 g/L |
| EU | European Paint Directive 2004/42/CE | Calculation | 0 g/L |
| China | Mandatory national standard of China | GB 30981.2-2025 | 10 g/L |
| Coating hazards GB | 30981.2-W-Pb≤1000-NC |
The data listed are based on factory batch production and may vary slightly with colour.
Solids content measured in accordance with ISO 3233 and the ASFP-BCF guidance method.
Typical recommended specification range
| Dry Film Thickness | 220–730 µm |
| Wet Film Thickness | 300–1000 µm |
The final coat of a single-coat or multi-coat system may be applied to a wet film thickness of 1500 µm, depending on the steelwork configuration, geometry, primer used and surrounding environment. All steelwork shall be coated to the correct film thickness to achieve the required fire rating. Refer to the current thickness tables. For details, contact the local JOTUN office.
Single-coat application
High-pressure airless spray equipment is recommended. The recommended typical wet film thickness (WFT) per coat is no more than 1000 µm. A single-coat WFT of up to 1500 µm is possible, but special care is required under extreme application conditions (high temperature, low temperature, humidity, etc.).
The most suitable application method and technique depend on many factors, such as coating thickness, the shape of the steel structure, working space, project planning, and whether other construction activities are present on site.
For further information, see the Application Guide.
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 airless spray. |
| Brush: | Recommended for touch-up and small-area application. Take care to achieve the specified dry film thickness. |
One-component
| Thinner | Fresh water |
|---|
The product is ready to use. Thinning affects sag resistance and delays drying time.
| Cleaner | Fresh water |
|---|
| Nozzle tip size (inch/1000): | 19-23 |
| Nozzle pressure (minimum): | 200 bar/2900 psi |
| Substrate Temperature | 10 °C | 23 °C | 40 °C |
| Touch Dry | 4 h | 2 h | 1 h |
| Handle dry | 16 h | 6 h | 4 h |
| Minimum recoat interval | 16 h | 6 h | 4 h |
For the maximum recoat interval, refer to the Application Guide (AG) for this product.
The minimum drying recoat interval is for self-recoating. See the additional guidance for the finish coat.
All drying times are measured at 1000 µm wet film, under controlled temperature and relative humidity below 80%.
The minimum application temperature for this product is 5 °C. For good application and drying, the steel and air temperatures should be above 10 °C.
Topcoat
The minimum recoat interval before applying a compatible topcoat is 24 hours. The system should reach handling dry, and a coating thickness gauge must not leave an indentation on the coating. Before applying the topcoat, the applicator must ensure the rated dry film thickness has been achieved.
| Touch Dry | The state at which light finger pressure leaves no mark or stickiness. |
|---|---|
| Handle dry | The minimum time after application before handling will not damage the film. |
Minimum recoat interval after drying: the recommended minimum interval before applying the next coat.
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: | Alkyd, epoxy, epoxy zinc phosphate, zinc epoxy (with epoxy tie coat) |
| Subsequent coat: | Approved topcoat list |
The primers and topcoats used must be compatible with the fire protection coating to ensure its fire performance. SteelMaster 120WB Interior Intumescent Steel Fire Protection Coating (6W6).
Contact your local JOTUN office for the approved primer and topcoat list.
Volume Container size
| (L) | ||
| SteelMaster 120WB Interior Intumescent Steel Fire Protection Coating (6W6) | 18.5 | 20 |
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.
During storage or transport, the temperature shall be between 5 °C (41 °F) and 35 °C (95 °F). In addition, climate control is recommended. Avoid frost during transport and storage.
SteelMaster 120WB, 18 months, Interior Intumescent Steel Fire Protection Coating (6W6)
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.
