Interthane 990 Polyurethane Topcoat belongs to polyurethane coatings and is used as a topcoat. Suitable for use as a topcoat for new construction and for maintenance, widely used in various environmental conditions, including offshore structures, chemical plants and petrochemical plants, bridges, paper mills and the power industry. A two-component aliphatic acrylic polyurethane topcoat with excellent durability and long-term recoatability. Intercoat adhesion when applied over aged Interthane 990 is reduced relative to application over a new coat, but still meets the requirements of the specified use. Parameters on this page: Volume Solids 57% ± 3% (depending on colour), Dry Film Thickness 50–75 µm (2–3 mil), Theoretical Spreading Rate 11.40 m²/L.
Parameter source: AKZONOBEL original Technical Data Sheet (TDS) “Interthane 990 Polyurethane Topcoat”; 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 | 57% ± 3% (depending on colour) |
|---|---|
| Dry Film Thickness | 50–75 µm (2–3 mils) |
| Theoretical Spreading Rate | 11.40 m²/L |
| VOC | 3.50 lb/gal (420 g/L) US EPA Method 24, 34… |
| Density / Specific Gravity | 1.21 kg/L (10.1 lb/gal) |
| Number of Components | Two-component |
| Thinner | Do not exceed the thinning limits of local environmental regulations |
| Mixing Ratio | 6 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 aliphatic acrylic polyurethane topcoat with excellent durability and long-term recoatability.
Suitable as a new-construction and maintenance topcoat, widely used in various environments, including offshore structures, chemical and petrochemical plants, bridges, paper mills and the power industry.
| Colour | A wide range of colours can be produced through the Chromascan tinting system. |
|---|
INTERTHANE 990
| Gloss | High gloss |
|---|---|
| Volume Solids | 57% ± 3% (depending on colour) |
| Typical thickness | DFT 50–75 µm (2–3 mil) corresponds to WFT 88–132 µm (3.5–5.3 mil) |
| Theoretical Spreading Rate | 11.40 m²/L at 50 µm dry film thickness and the stated volume solids; 457 ft²/US gal at 2 mil dry film thickness and the stated volume solids |
| 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 (23°F) | 8 h | 60 h | Unlimited¹ | |
| 5°C (41°F) | 5 h | 24 h | Unlimited¹ | |
| 15°C (59°F) | 150 min | 10 h | Unlimited¹ | |
| 25°C (77°F) | 90 min | 6 h | Unlimited¹ | |
| 40°C (104°F) | 60 min | 3 h | Unlimited¹ | |
¹ See Definitions and Abbreviations from the International Paint Protective Coatings division.
| Flash point (typical) | Component A 34 °C (93 °F); Component B 49 °C (120 °F); mixed 35 °C (95 °F) |
|---|---|
| Product weight | 1.21 kg/L (10.1 lb/gal) |
| Volatile Organic Compounds | 3.50 lb/gal (420 g/L) US EPA Method 24 341 g/kg EC Solvent Emissions Directive content (Council Directive 2010/75/EU) 379 g/L Chinese National Standard GB 23985 Coating Hazardous Substances GB 30981.2-S-Pb≤90-C Complies with GB 30981.2-2025. For more detailed information, please 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.
Pre-primed surfaces: Interthane 990 shall always be applied over the recommended anti-corrosive primer. The primer surface shall be dry and free from any contaminants. Interthane 990 must be applied within the specified recoat interval (refer to the relevant product data sheet).
Areas with cracks, damage and other defects shall be prepared to the grade specified in the standard (for example: Sa2½ (ISO 8501-1:2007), SSPC SP6, or SSPC SP11) and the primer shall be repaired before application of Interthane 990.
| 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. |
|---|
(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 | 6 parts : 1 part (by volume) |
|---|
| Pot life | -5°C (23°F) | 5°C (41°F) | 15°C (59°F) | 25°C (77°F) | 40°C (104°F) |
| 26 h | 12 h | 4 h | 2 h | 45 min |
| Suitable for airless spray | Recommended: nozzle diameter 0.33–0.45 mm (13–18 thousandths of an inch); total paint pressure at the nozzle not less than 155 kg/cm² (2204 psi) |
|---|
| Air Spray | Recommended | Spray gun | DeVilbiss MBC or JGA |
| Air nozzle | 704 or 765 | ||
| (with pressure pot) | Spray painting | E | |
| Air spray (conventional) | Recommended | Use suitable dedicated equipment. | |
| Brush | Suitable | Typical thickness 40–50 µm (1.6–2.0 mils) | |
| Roller application | Suitable | Typical thickness 40–50 µm (1.6–2.0 mils) | |
| Thinner | International GTA713 | Do not exceed the thinning limits of local environmental regulations |
(or International GTA733 or GTA056)
| Cleaner | Use a cleaning solvent that complies with local regulations. Consult the local representative for specific recommendations. |
|---|---|
| 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.
Interthane 990 is available in various metallic topcoats; refer to the Interthane 990 "Metallic Coating Application Procedure" leaflet for more information.
Gloss and surface evenness depend on the application method. Avoid mixing different application methods as far as possible.
Conventional air spray generally gives ideal gloss and appearance.
When applying by brush and roller, for certain colours, two coats of Interthane 990 may be required to achieve uniform coverage, particularly when applied over dark primers or when using certain lead-free bright colours such as yellow and orange. The ideal practice is to use a colour-matched intermediate coat or anti-corrosive coat beneath Interthane 990.
When recoating after weathering or ageing, ensure the coating is thoroughly cleaned to remove all surface contaminants, such as oil, grease, crystalline salts and road grime, before applying subsequent Interthane 990 coats.
Intercoat adhesion when applied over aged Interthane 990 is reduced relative to application over a new coat, but still meets the requirements of the specified use.
This product may be thinned only with the recommended International thinner. Other thinners, especially alcohol-containing thinners, severely inhibit the curing mechanism of the coating.
The temperature of the surface to be coated must be at least 3 °C (5 °F) above the dew point.
Ensure adequate ventilation when applying Interthane 990 in confined spaces.
Interthane 990 can cure below 0 °C (32 °F). However, the product should not be applied at 0 °C (32 °F) due to possible ice formation on the substrate. Condensation on the surface during or after application will result in a gloss-free surface and a poor-quality film. Premature exposure to standing water may cause colour change, particularly with dark colours and under low-temperature conditions.
This product is not recommended for immersion service. If severe chemical or solvent splashes are likely, contact International Paint for information on suitability.
To improve workability, a modified version of Interthane 990 has been used in the Korean market.
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 990:
| Intercure 200 | Interseal 670HS |
|---|---|
| Intercure 200HS | Intershield 300HS |
| Intercure 420 | Interzinc 315 |
| Intergard 251HS | Interzinc 52 |
| Intergard 251 | Interzinc 52E |
| Intergard 269 | Interzone 954 |
| Intergard 345 | Interzone 1000 Intergard 475HS Interthane 990 is suitable for recoating itself. |
For other suitable primers/intermediate coats, consult International Paint.
| For further information on the industry standards, terms and abbreviations used in this datasheet, see www.international-pc.com | The following documents provided on the website: • Definitions and abbreviations • Surface preparation • Coating application • Theoretical and practical spreading rate • Interthane 990 metallic topcoat application procedure. Leaflets of these sections are available 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 | 17.14 L | 20 L | 2.86 L | 3.7 L |
| 5 US gal | 4.29 US gal | 5 US gal | 0.71 US gal | 1 US gal |
For other packaging sizes, contact AkzoNobel.
| Packaging Specifications | Component A | Component B |
| 20 L | 23.1 kg | 3.5 kg |
| 5 US gal | 47.6 lb | 7.1 lb |
| Shelf life | At 25 °C (77 °F), Component A 24 months, Component B 18 months. |
|---|
Thereafter, inspection is required. Store in a dry, cool environment away from heat and sources of ignition.
© 2026/5/26 AkzoNobel. All rights reserved.
www.international-pc.com
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 in-house item numbers for Interthane 990 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 |
|---|---|---|
| PHB000 | White | 17.14 L + 2.86 L |
| PHU81J | GSB-G04 | 17.14 L + 2.86 L |
| PHL549 | Signal Green | 17.14 L + 2.86 L |
| PHY999 | Black | 17.14 L + 2.86 L |
| PHC287 | Signal Red | 17.14 L + 2.86 L |
| PHN16K | GSB-BG01 | 17.14 L + 2.86 L |
| PHA046 Agent | — | 2.86 L |
| PHJ10H | GSB-PB03 | 17.14 L + 2.86 L |
| PHP55N | GSB-R03 | 17.14 L + 2.86 L |
| PHB134 | Yellow | 17.14 L + 2.86 L |
| PHK724 | Storm Grey | 17.14 L + 2.86 L |
| PHA909 | RAL9006 | 17.14 L + 2.86 L |
| PHD704 | RAL7035 | 17.14 L + 2.86 L |
| PHL274 | Red | 17.14 L + 2.86 L |
| PHU43G | GSB-B03 | 17.14 L + 2.86 L |
| PHU49U | GSB-GY07 | 17.14 L + 2.86 L |
| PHB132 | RAL1023 | 17.14 L + 2.86 L |
| PHE992 | Dark Blue | 17.14 L + 2.86 L |
| PHB915 | RAL5015 | 17.14 L + 2.86 L |
| PHZ912 | RAL7038 | 17.14 L + 2.86 L |
| PHF684 | Surf Grey | 17.14 L + 2.86 L |
| PHJ36W | GSB-G03 | 17.14 L + 2.86 L |
| PHW82W | GSB-G09 | 17.14 L + 2.86 L |
| PHM231 | — | 17.14 L + 2.86 L |
| PHB969 | — | 17.14 KG + 2.86 KG |
| PHJ35G | GSB-PB06 | 17.14 L + 2.86 L |
| PHK766 | RAL7001 | 17.14 L + 2.86 L |
| PHB117 | RAL1021 | 17.14 L + 2.86 L |
| PHX37L | 10B8 | 17.14 L + 2.86 L |
| PHJ35C | PB09 | 17.14 L + 2.86 L |
| PHY65M | PB04 | 17.14 L + 2.86 L |
| PHP37D | RAL6037 | 17.14 L + 2.86 L |
| PHD259 | RAL2004 | 17.14 L + 2.86 L |
| PHB898 | RAL5012 | 17.14 L + 2.86 L |
| PHB168 | RAL1003 | 17.14 L + 2.86 L |
| PHY76R | GSB-G01 | 17.14 L + 2.86 L |
| PHF259 | RAL2001 | 17.14 L + 2.86 L |
| PHJ10F | GSB-R01 | 17.14 L + 2.86 L |
| PHZ901 | RAL9017 | 17.14 L + 2.86 L |
| PHY64X | GSB-Y05 | 17.14 L + 2.86 L |
| PHF287 | RAL3000 | 17.14 L + 2.86 L |
| PHC935 | Blue | 17.14 L + 2.86 L |
| PHZ028 | RAL9003 | 17.14 L + 2.86 L |
| PHD260 | Orange | 17.14 L + 2.86 L |
| PHB299 | RAL3020 | 17.14 L + 2.86 L |
| PHK528 | Grass Green | 17.14 L + 2.86 L |
| PHI103 | RAL5023 | 17.14 L + 2.86 L |
| PHU38X | G05(GB | 17.14 L + 2.56 L |
| PHM404 | RAL6011 | 17.14 L + 2.86 L |
| PHS86K | GSB-G05 | 17.14 L + 2.86 L |
| PHJ36F | GSB-Y11 | 17.14 L + 2.86 L |
| PHI849 | — | 17.14 L + 2.86 L |
| PHM704 | RAL7037 | 17.14 L + 2.86 L |
| PHE563 | RAL6032 | 17.14 L + 2.86 L |
| PHU32N | RAL1026 | 17.14 L + 2.86 L |
| PHE589 | RAL6001 | 17.14 L + 2.86 L |
| PHD913 | — | 17.14 L + 2.86 L |
| PHR01J | 5G 6 | 17.14 L + 2.86 L |
| PHX67H | RAL7047 | 17.14 L + 2.86 L |
| PHC922 | RAL5002 | 17.14 L + 2.86 L |
| PHL765 | RAL7000 | 17.14 L + 2.86 L |
| PHG360 | Munsell 7.5BG7 | 17.14 L + 2.86 L |
| PHZ007 | RAL9010 | 17.14 L + 2.86 L |
| PHZ625 | RAL7042 | 17.14 L + 2.86 L |
| PHB011 | RAL1016 | 17.14 L + 2.86 L |
| PHL547 | RAL6010 | 17.14 L + 2.86 L |
| PHS095 | RAL1018 | 17.14 L + 2.86 L |
| PHB069 | BS4800-08B15 | 17.14 L + 2.86 L |
| PHN31M | GSB-YR04 | 17.14 L + 2.86 L |
| PHP62X | RAL3028 | 17.14 L + 2.86 L |
| PHH000 | — | 17.14 L + 2.86 L |
| PHS717 | RAL4003 | 17.14 L + 2.86 L |
| PHP275 | RAL8012 | 17.14 L + 2.86 L |
| PHV388 | RAL6003 | 17.14 L + 2.56 L |
| PHJ105 | RAL1019 | 17.14 L + 2.86 L |
| PHY83R | GSB-Y07 | 17.14 L + 2.86 L |
| PHN05Q | YR05 | 17.14 L + 2.86 L |
| PHC243 | RAL2008 | 17.14 L + 2.86 L |
| PHE918 | RAL5019 | 17.14 L + 2.86 L |
| PHJ35M | R05 ORANGE | 17.14 L + 2.86 L |
| PHH108 | RAL1001 | 17.14 L + 2.86 L |
| PHS226 | RAL2011 | 17.14 L + 2.86 L |
| PHQ765 | RAL7011 | 17.14 L + 2.86 L |
| PHM272 | RAL3009 | 17.14 L + 2.86 L |
| PHY64Y | GSB-B02 | 17.14 L + 2.86 L |
| PHH296 | RAL3011 | 17.14 L + 2.86 L |
| PHG900 | RAL5007 | 17.14 L + 2.86 L |
| PHO639 | RAL7045 | 17.14 L + 2.86 L |
| PHJ34V | GSB-B04 | 17.14 L + 2.86 L |
| PHJ35H | GSB-PB11 | 17.14 L + 2.86 L |
| PHZ903 | RAL9004 | 17.14 L + 2.86 L |
| PHB953 | RAL5005 | 17.14 L + 2.86 L |
| PHK214 | RAL8001 | 17.14 L + 2.86 L |
| PHC633 | RAL5009 | 17.14 L + 2.86 L |
| PHG135 | RAL1004 | 17.14 L + 2.86 L |
| PHF273 | RAL2002 | 17.14 L + 2.86 L |
| PHZ916 | RAL5024 | 17.14 L + 2.86 L |
| PHC261 | RAL2009 | 17.14 L + 2.86 L |
| PHK363 | RAL6021 | 17.14 L + 2.86 L |
| PHY72M | GSB-PB05 | 17.14 L + 2.86 L |
| PHZ651 | RAL7040 | 17.14 L + 2.86 L |
| PHI605 | RAL9005 | 17.14 L + 2.86 L |
| PHJ019 | RAL7032 | 17.14 L + 2.86 L |
| PHS951 | RAL5017 | 17.14 L + 2.86 L |
| PHE017 | RAL9002 | 17.14 L + 2.86 L |
| PHJ46V | GSB-B05 | 17.14 L + 2.86 L |
| PHE322 | RAL6019 | 17.14 L + 2.86 L |
| PHD583 | RAL6029 | 17.14 L + 2.86 L |
| PHZ016 | RAL9016 | 17.14 L + 2.86 L |
This model has a total of109item 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.
