Interchar 1120 Water-borne Intumescent Fire Protection Coating belongs to fire protection coatings and water-borne systems. It provides cellulosic fire protection for beams, columns and hollow sections in internal environments. Interchar 1120 is a low-VOC intumescent coating with a fire resistance rating up to 3 h in independent fire tests, meeting the requirements of ASTM E119/UL263, BS 47620-22, EN 13381-8 and GB 14907. For surfaces with high decorative requirements, additional treatment may be required before application of the topcoat. Refer to the application instructions for further information. Parameters on this page: volume solids 68% ± 3%, DFT 300–700 µm (12–28 mil), theoretical spreading rate 0.97 m²/L.
Parameter source: AKZONOBEL original technical data sheet (TDS) 'Interchar 1120 Water-borne Intumescent Fire Protection Coating'; 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 | 68% ± 3% |
|---|---|
| Dry Film Thickness | 300–700 µm (12–28 mil) |
| Theoretical Spreading Rate | 0.97 m²/L |
| VOC | 0.16 lb/gal (20 g/L) US EPA Method 24 0 g… |
| Density / Specific Gravity | 1.4 kg/L (11.7 lb/gal) |
| Number of Components | One-component |
| Flash Point | >101°C (214°F) |
| Thinner | Generally not required |
| Mixing Ratio | N/A |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
A one-component, chlorine-free and boric acid-free, water-borne intumescent coating designed for on-site application to internal steel structures requiring protection against cellulosic fires.
Interchar 1120 is a low-VOC intumescent coating with fire resistance ratings up to 3 hours in independent fire tests, and complies with the requirements of ASTM E119/UL263, BS 47620-22, EN 13381-8 and GB 14907.
Interchar 1120 is a CE-certified product and complies with the requirements of European Technical Assessment ETA-20/1193.
Provides cellulosic fire protection for beams, columns and hollow sections in internal environments.
| Colour | White INTERCHAR 1120 |
|---|---|
| Gloss | Matt |
| Volume Solids | 68% ± 3% (determined in accordance with ISO 3233 and BCF guidance method) |
| Typical thickness | Dry film thickness 300–700 µm (12–28 mils), equivalent to wet film thickness 441–1029 µm (17.6–41.2 mils). Film thickness depends on the fire resistance rating. |
| Theoretical Spreading Rate | At 700 µm dry film thickness and the stated volume solids, 0.97 m²/L; at 28 mils dry film thickness and the stated volume solids, 39 ft²/US gallon. |
| Practical Spreading Rate | Allowing for a suitable loss factor |
| Application Methods | Suitable for airless spray, brush, roller. Drying time; self-recoat interval |
| Temperature | Surface Dry | Hard Dry | Minimum | Maximum |
| 10°C (50°F) | 5 h | 6 h | 16 h | Unlimited¹ |
| 15°C (59°F) | 4 h | 5 h | 12 h | Unlimited¹ |
| 25°C (77°F) | 2 h | 4 h | 6 h | Unlimited¹ |
| 40°C (104°F) | 1 h | 3 h | Unlimited¹ | |
¹ See Definitions and Abbreviations of the International Protective Coatings Industrial Coatings division. The drying times listed in the table above were determined at a typical dry film thickness of 700 µm (28 mils). Good ventilation is required.
The minimum recoat interval before the topcoat is 24 h. Further details on the minimum recoat interval are available in the application guide.
| Flash point (typical) | >101°C (214°F) |
|---|---|
| Product weight | 1.4 kg/L (11.7 lb/gal) |
| Volatile Organic Compounds | 0.16 lb/US gallon (20 g/L) US EPA Method 24; 0 g/kg EC Solvent Emissions Directive content (Council Directive 2010/75/EU); coating hazard GB 30981.2-W-Pb≤1000-NC; complies with GB 30981.2-2025. For further details, refer to the 'Product Characteristics' section. |
All surfaces to be coated must be clean, dry and free of contamination. Before application, all surfaces must be assessed and prepared in accordance with ISO 8504:2000. Remove any oil and grease by solvent cleaning in accordance with SSPC-SP1.
On pre-primed steel structures, Interchar 1120 shall always be applied over the recommended anticorrosive primer. The primer surface shall be dry and free from contamination, and Interchar 1120 shall be applied within the specified recoat interval (refer to the Interchar 1120 application guide).
Cracks, damage and other defects shall be blast cleaned to Sa 2.5 (ISO 8501-1:2007) or SSPC-SP6, or power tool cleaned to SSPC-SP11, and these areas shall be primed before application of Interchar 1120.
On substrates pre-primed with zinc-rich primer, Interchar 1120 may be applied over certified epoxy zinc-rich primer that has been overcoated with a tie coat.
Before application of Interchar 1120, ensure the primer surface is clean, dry and free from contamination. The recommended tie coats are Intergard 269 or Intergard 276.
| Mixing | This product is a single-component coating; stir thoroughly with a power mixer before each use |
|---|---|
| Mixing ratio | N/A |
| Suitable for airless spray | Recommended nozzle diameter 0.43–0.53 mm (17–21 mils); total paint pressure at the nozzle minimum 175 kg/cm² (2489 psi). |
| Air Spray | Not recommended (with pressure pot) |
| Air spray (conventional) | N/A |
| Brush | Suitable | Suitable for small areas and repair; multiple coats are required to achieve the specified dry film thickness. |
| Roller application | Suitable for small areas | Typical thickness 100–300 µm (4.0–12.0 mils) |
| Thinner | Generally not required. |
|---|---|
| Cleaner | Clean water |
| Interruption of work | Do not leave coating in hoses, spray guns or spray equipment. Flush all equipment thoroughly with clean water; organic solvents shall not be used. All unused coating shall be stored in sealed containers. After storage for a period, surface skinning may occur in partially filled containers. |
| Cleaning | Clean all equipment immediately after use with clean water. Flushing spray equipment periodically during application is recommended. Cleaning frequency depends on the volume sprayed, temperature and time, including all interruptions. |
Surplus paint and empty containers must be disposed of in accordance with the relevant regional regulations.
Consult the detailed Interchar 1120 application guide before use.
Interchar 1120 holds certifications to various international standards; for advice on fire resistance ranges and certification information, consult International Protective Coatings. Where UL263 certification is required, the HFA122 grade shall be requested.
Interchar 1120 shall be protected from freezing during storage and transport. For optimal application and drying performance, ambient and substrate temperatures shall be above 10°C (50°F), and relative humidity shall be below 80%. To improve drying and recoating characteristics and enable rapid application, good ventilation shall be maintained. Temperatures below 10°C (50°F), or relative humidity above 80%, will delay coating drying and extend the recoat interval.
Disposal of frozen Interchar 1120 shall comply with local regulations; do not thaw frozen coating for application.
The surface to be coated shall be at least 3°C (5°F) above the dew point. Application shall not proceed when environmental conditions deteriorate, such as falling temperature or possible condensation of moisture.
Airless spray is the ideal method to achieve the maximum film thickness in one coat. Application methods other than airless spray are unlikely to achieve the required film thickness.
Avoid overspray in internal corners and similar areas.
The final appearance of Interchar 1120 depends on the application method. In visible areas, spray application is recommended. For surfaces with high decorative requirements, additional preparation may be required before topcoat application; refer to the application guide for further information. In ISO 12944 C1 environments, a sealer coat may be omitted.
Interchar 1120 is certified for use in internal exposure environments as defined in ISO 12944. For specific internal environments, consult International Protective Coatings for a suitable primer and topcoat system.
Interchar 1120 is UL certified; no topcoat is required when used in controlled internal spaces and general internal spaces.
Interchar 1120 films, whether sealed or unsealed, shall be protected from contact with standing water and running water.
Interchar 1120 shall not be used in areas subject to frequent immersion/soaking.
Note: VOC values are typical and for guidance only. They may vary with colour and general production tolerances.
The following primers are approved for use with Interchar 1120:
| Intercryl 525 | Intergard 251HS | Interlac 573 |
| Intercure 200 | Intergard 2509 | Interprime 306 |
| Intercure 200HS | Intergard 269 | Interseal 670HS |
| Intergard 251 | InterH2O 499 | Interseal 1052 |
With a suitable tie coat, Interchar 1120 may also be applied over Interzinc 52; see the Surface Preparation section. The following topcoats are approved for use with Interchar 1120:
| Intercryl 525 | Intersheen 579 |
|---|---|
| Interthane 870 | Interthane 990Interthane 990SG. For further information and assistance on primers and topcoats suitable for Interchar 1120, consult the International Protective Coatings division. |
| For further information on the industry standards, terms and abbreviations used in this datasheet, see www.international-pc.com | Refer to the following documents provided on the website: • Definitions and Abbreviations • Surface Preparation • Coating Application • Theoretical and Practical Spreading Rates • Interchar One-Component Water-borne Intumescent Fire Protection Coating Application Guide. These sections are also available as separate publications on request. |
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This product must be applied at the production site by professional applicators in accordance with the recommendations in this manual, the Material Safety Data Sheet and the instructions on the container label. Do not use this product without first reviewing the Material Safety Data Sheet (MSDS) that International Paint provides for its customers.
All work related to the application and use of this product must be carried out in accordance with the relevant national health, safety and environmental standards and regulations.
If welding or flame cutting is required on metal coated with this product, dust and fumes will be generated; use appropriate personal protective equipment and adequate local ventilation.
If in doubt about the suitability of this product for the intended use, consult AkzoNobel for further advice.
| Packaging Specifications | ||
| Volume | Packaging | |
| 20 L | 20 L | |
| 5 US gal | 5 US gal |
For other packaging sizes, contact AkzoNobel.
Packaging Specifications
| 20 L | 30.2 kg |
|---|---|
| 5 US gal | 68.3 lb |
| Shelf life | At 25°C (77°F), at least 12 months. Inspection is required thereafter. Store in a dry, cool environment away from heat and ignition sources. Protect from frost. |
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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.
The factory item numbers for Interchar 1120 Water-borne Intumescent Fire Protection Coating 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 |
|---|---|---|
| HFA120 White | — | 20 L |
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.
