Interthane 870 Polyurethane Topcoat is a polyurethane coating used as a topcoat. Suitable for new construction and as an industrial maintenance topcoat, widely used in various environments including offshore structures, petrochemical plants, bridges, paper mills and the power industry. A two-component, high-build acrylic polyurethane topcoat with high durability and long-term recoatability. Intercoat adhesion over aged Interthane 870 is lower than over fresh coating, but still adequate for the specified use. Parameters on this page: volume solids 56% ± 3% (depending on colour); dry film thickness 75–125 µm (3–5 mils); theoretical spreading rate 4.48 m²/L.
Source: AKZONOBEL original technical data sheet (TDS) 'Interthane 870 Polyurethane Topcoat'. 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 | 56% ± 3% (depending on colour) |
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| Dry Film Thickness | 75–125 µm (3–5 mil) |
| Theoretical Spreading Rate | 4.48 m²/L |
| VOC | 3.14 lb/gal (377 g/L), US EPA Method 24, 28… |
| Density / Specific Gravity | 1.38 kg/L (11.5 lb/gal) |
| Number of Components | Two-component |
| Thinner | Do not exceed the thinning limits of local environmental regulations |
| Mixing Ratio | 7 parts : 1 part (by volume) |
| Colour / Appearance | A wide range of colours can be produced through the Chromascan tinting system |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
A two-component, high-build acrylic polyurethane topcoat with high durability and long-term recoatability.
Suitable for new construction and as an industrial maintenance topcoat, widely used in various environments including offshore structures, petrochemical plants, bridges, paper mills and the power industry.
Specially designed for areas where semi-gloss rather than high gloss is desired. Provides an alternative where a conventional high-gloss polyurethane topcoat cannot be used to overcoat the intermediate coat.
| Colour | A wide range of colours can be produced through the Chromascan tinting system. |
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INTERTHANE 870
| Gloss | Semi-gloss |
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| Volume Solids | 56% ± 3% (depending on colour) |
| Typical thickness | Dry film thickness 75–125 µm (3–5 mils), equivalent to wet film thickness 134–223 µm (5.4–8.9 mils) |
| Theoretical Spreading Rate | At 125 µm dry film thickness and the stated volume solids: 4.48 m²/L; at 5 mils dry film thickness and the stated volume solids: 180 ft²/US gal |
| Practical Spreading Rate | Allowing for a suitable loss factor |
| Application Methods | Suitable for airless spray, air spray, brush, roller. Drying time; recommended topcoat recoat interval |
| Temperature | Surface Dry | Hard Dry | Minimum | Maximum |
| 5°C (41°F) | 90 min | 30 h | Unlimited¹ | |
| 15°C (59°F) | 75 min | 16 h | Unlimited¹ | |
| 25°C (77°F) | 60 min | 5 h | Unlimited¹ | |
| 40°C (104°F) | 45 min | 2.5 h | Unlimited¹ | |
¹ See Definitions and Abbreviations from the International Paint Protective Coatings division.
| Flash point (typical) | Component A 35 °C (95 °F); Component B 50 °C (122 °F); mixed 35 °C (95 °F) |
|---|---|
| Product weight | 1.38 kg/L (11.5 lb/gal) |
| Volatile Organic Compounds | 3.14 lb/gal (377 g/L), US EPA Method 24; 280 g/kg, EU Solvent Emissions Directive (Council Directive 2010/75/EU); 362 g/L, Chinese national standard GB 23985; coating hazard GB 30981.2-S-Pb≤90-C; complies with GB 30981.2-2025. For more details, refer to the 'Product Characteristics' section. |
All surfaces to be coated must be clean, dry and free of contaminants. Before application, all surfaces must be assessed and prepared in accordance with ISO 8504:2019.
Primed surfaces: Interthane 870 should always be applied over a recommended anti-corrosive primer. The primer surface must be dry and free of contaminants, and Interthane 870 must be applied within the specified recoat interval (refer to the relevant product data sheet).
Cracked or damaged areas should be prepared to the standard specified (e.g. Sa 2½ (ISO 8501-1:2007), SSPC SP6 or SSPC SP11), and the primer repaired before applying Interthane 870.
| Mixing | This product is supplied in two containers forming one unit. Mix the two components in the specified ratio in one operation. Once mixed, use within the specified pot life. |
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(1) Stir the base (Component A) with a power mixer.
(2) Mix all of the curing agent (Component B) with the base (Component A) and stir thoroughly with a power mixer.
| Mixing ratio | 7 parts : 1 part (by volume) |
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| Pot life | 5°C (41°F) | 15°C (59°F) | 25°C (77°F) | 40°C (104°F) |
| 7 h | 3.5 h | 2 h | 45 min |
| Suitable for airless spray | Recommended nozzle tip size 0.43–0.58 mm (17–23 thou); total paint pressure at the nozzle not less than 155 kg/cm² (2204 psi) |
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| Air Spray | Recommended | Spray gun | DeVilbiss MBC or JGA |
| Air nozzle | 704 or 765 | ||
| (with pressure pot) | Nozzle | E | |
| Air spray (conventional) | Suitable | Use suitable dedicated equipment. | |
| Brush | Suitable | Typical thickness 50–75 µm (2.0–3.0 mils) | |
| Roller application | Suitable | Typical thickness 50–75 µm (2.0–3.0 mils) | |
| Thinner | International GTA713 | Do not exceed the thinning limits of local environmental regulations |
or International GTA733 (or International GTA056)
| Cleaner | Use a cleaning solvent that complies with local regulations. Consult the local representative for specific recommendations. |
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| Interruption of work | Do not leave paint in hoses, spray guns or spray equipment. Flush all equipment thoroughly with International thinner. Once mixed, paint should not be resealed; if work is interrupted for too long, mix a fresh batch for application. |
| Cleaning | All equipment should be cleaned immediately after use with International thinner. Flushing spray equipment periodically during daily work is good practice. Cleaning frequency depends on the volume sprayed, temperature, spraying time, including interruptions, and other factors. |
All surplus paint and empty containers must be disposed of in accordance with the relevant local laws/regulations.
Gloss and surface evenness depend on the application method. Avoid mixing different application methods as far as possible.
Apply by airless spray to achieve the maximum film thickness per coat. Application methods other than airless spray cannot achieve the required film thickness. With air spray, several cross coats are required to achieve the maximum film thickness. At low or high temperatures, special application techniques may be required to achieve the maximum film thickness.
If one coat is to be applied by brush or roller, choose a primer colour matching the final coat colour. Dark primers and MIO primers normally require two coats of Interthane 870.
When applying Interthane 870 by brush or roller, multiple coats are necessary to reach the specified total system dry film thickness.
Applicators should be aware that the single-coat capability of Interthane 870 is affected by substrate temperature. At higher steel temperature, film build is lower and the resulting coating thinner.
This product must be thinned only with the recommended International thinner. Other thinners, especially alcohol-containing thinners, severely inhibit the curing process.
Do not apply when the steel temperature is below 5 °C (41 °F). When applying Interthane 870 in confined spaces, ensure adequate ventilation.
When recoating after weathering or ageing, ensure the coating is thoroughly cleaned of all surface contaminants such as oil, grease, crystalline salt and road grime before applying subsequent Interthane 870 coats.
Condensation on the surface during or after application will cause loss of gloss and a poor-quality film.
Premature exposure to standing water may cause colour change, especially for dark colours and at low temperatures.
Intercoat adhesion over aged Interthane 870 is lower than over fresh coating, but still adequate for the specified use.
This product is not recommended for immersion service. If severe chemical or solvent splashes are likely, contact International Paint for information on suitability.
After consulting the International Paint Protective Coatings division, this paint may be applied by other methods such as flow coating.
Note: VOC values are typical and for guidance only. They may vary with colour and general production tolerances.
Although the low-molecular-weight reactive additive becomes part of the film when cured under normal ambient conditions, analysis by EPA Method 24 shows that it also affects the VOC value.
The following primers/intermediate coats are recommended for use with Interthane 870:
| Intercure 200 | Intergard 251HS | Interseal 670HS |
| Intercure 200HS | Intergard 475HS | Interzinc 52 |
| Intercure 420 | Interplus 256 | Interzinc 52E |
| Intercure 420HS | Interplus 356 | Interzinc 315 |
| Intergard 251 | Intershield 300HS | Interzone 954 |
Interthane 870 is suitable for recoating with itself.
For other suitable primers/intermediate coats, consult International Industrial Coatings.
| For further information on the industry standards, terms and abbreviations used in this datasheet, see www.international-pc.com | In the following documents on the website: • Definitions and abbreviations • Surface preparation • Coating application • Theoretical and practical spreading rate. 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.
Warning: contains isocyanates. Wear an air-fed helmet when spraying.
| Packaging Specifications | Component A | Component B | ||
| Volume | Packaging | Volume | Packaging | |
| 20 L | 17.5 L | 20 L | 2.5 L | 3.7 L |
| 5 US gal | 4.38 US gal | 5 US gal | 0.63 US gal | 1 US gal |
For other packaging sizes, contact AkzoNobel.
| Packaging Specifications | Component A | Component B |
| 20 L | 27 kg | 3.1 kg |
| 5 US gal | 55.1 lb | 6.4 lb |
| Shelf life | At least 12 months at 25 °C (77 °F). Thereafter, inspection is required. Store in a dry, cool environment away from heat and sources of ignition. |
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All registered trademarks mentioned in this publication are licensed to or owned by AkzoNobel.
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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 of Interthane 870 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 |
|---|---|---|
| QGJ46V | GSB-B05 | 17.5 L + 2.5 L |
| QGB915 | RAL5015 | 17.5 L + 2.5 L |
| QGZ028 | RAL9003 | 20 L |
| QGY899 | RAL7021 | 17.5 L + 2.5 L |
| QGD704 | RAL7035 | 17.5 L + 2.5 L |
| QGE322 | RAL6019 | 20 L |
| QGD087 | RAL1015 | 20 L |
| QGM242 | RAL8004 | 20 L |
| QGM785 | RAL7031 | 17.5 L + 2.5 L |
| QGB117 | RAL1021 | 20 L |
| QGR744 | RAL7012 | 20 L |
| QGZ651 | RAL7040 | 20 L |
| QGI605 | RAL9005 | 17.5 L + 2.5 L |
| QGE918 | RAL5019 | 17.5 L + 2.5 L |
| QGN16K | BG01 | 20 L |
| QGF287 | RAL3000 | 20 L |
| QGC603 | RAL6016 | 20 L |
| QGS095 | RAL1018 | 20 L |
| QGZ903 | RAL9004 | 20 L |
| QGB168 | RAL1003 | 17.5 L + 2.5 L |
| QGY999 | Black | 17.5 L + 2.5 L |
This model has a total of21item 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.
