Interthane 990SG Polyurethane Topcoat belongs to polyurethane coatings and is used as a topcoat. Suitable as a topcoat for new construction and maintenance; widely used under various environmental conditions, including offshore structures, chemical and petrochemical plants, bridges, paper mills and the power industry. A two-component aliphatic acrylic polyurethane topcoat with high durability and long-term recoatability. Intercoat adhesion when applied over aged Interthane 990SG is lower than that over a new coating, but still meets the requirements of the specified use. Parameters on this page: volume solids 72% ± 3%, subject to variation; DFT 50–75 µm (2–3 mil); theoretical spreading rate 14.40 m²/L.
Parameter source: AKZONOBEL original technical data sheet (TDS) 'Interthane 990SG Polyurethane Topcoat'; values such as spreading rate are converted from TDS parameters 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 | 72% ± 3%, subject to variation |
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| Dry Film Thickness | 50–75 µm (2–3 mils) |
| Theoretical Spreading Rate | 14.40 m²/L |
| VOC | 236 g/kg EU solvent emissions directive content (Council Directive 2010/75... |
| Density / Specific Gravity | 1.47 kg/L (12.3 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 topcoat for new construction and maintenance; widely used under various environmental conditions, including offshore structures, chemical and petrochemical plants, bridges, paper mills and the power industry.
Specially designed for areas where high gloss is not required or semi-gloss is preferred.
| Colour | A wide range of colours can be produced through the Chromascan tinting system. |
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INTERTHANE 990SG
| Gloss | Semi-gloss (see page 3) |
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| Volume Solids | 72% ± 3% depending on colour |
| Typical thickness | DFT 50–75 µm (2–3 mil) corresponds to WFT 69–104 µm (2.8–4.2 mil) |
| Theoretical Spreading Rate | At 50 µm DFT and the stated volume solids: 14.40 m²/L. At 2 mil DFT and the stated volume solids: 577 ft²/US gal. |
| Practical Spreading Rate | Allowing for a suitable loss factor |
| Application Methods | Air spray, suitable for airless spray, brush, roller. Drying time; self-recoat interval |
| Temperature | Surface Dry | Hard Dry | Minimum | Maximum |
| 5°C (41°F) | 5 h | 24 h | Unlimited¹ | |
| 15°C (59°F) | 2.5 h | 10 h | Unlimited¹ | |
| 25°C (77°F) | 1.5 h | 6 h | Unlimited¹ | |
| 40°C (104°F) | 1 h | 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) |
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| Product weight | 1.47 kg/L (12.3 lb/gal) |
| Volatile Organic Compounds | 236 g/kg EU solvent emissions directive content (Council Directive 2010/75/EU); coating hazard GB 30981.2-S-Pb≤90-C; conforms to GB 30981.2-2025. For further details, see 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.
Oil and grease must be removed in accordance with the SSPC-SP1 solvent cleaning standard.
Pre-primed surfaces: Interthane990SG shall always be applied over the recommended anti-corrosive primer. The primer surface shall be dry and free from any contaminants. Interthane990SG shall be applied within the specified recoating interval (refer to the relevant product data sheet).
Areas with cracking, damage or similar defects shall be prepared to the grades specified in the standards (for example: Sa2½ (ISO 8501-1:2007), SSPC SP6 or SSPCSP11), and the primer shall be repaired before application of Interthane 990SG.
| 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 | 6 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 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) |
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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 (or | Do not exceed the thinning limits of local environmental regulations |
or International GTA733 or InternationalGTA056)
| Cleaner | International GTA713 or (International GTA733 or InternationalGTA056) |
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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. |
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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.
When applying by brush and roller, certain colours may require two or more coats of Interthane 990SG to achieve uniform coverage, especially over dark-coloured primer coats. In addition, when applying specific bright colours of Interthane 990SG that are free of heavy-metal lead, such as yellow and orange, a suitable method is to combine Interthane 990SG with a colour-matched intermediate coat or anti-corrosive coating.
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 the subsequent Interthane 990SG coat.
Intercoat adhesion over aged Interthane 990SG is lower than that over a new coating, but still meets the requirements of the specified use.
This product shall be thinned only with the recommended International brand thinner.
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 990SG in confined spaces.
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.
This product is not recommended for immersion service. If severe chemical or solvent splashes are likely, contact International Paint for information on suitability.
Gloss grade: a gloss version of Interthane 990SG is available in the Middle East. For more information, contact International Protective Coatings Middle East.
Note: VOC values are typical and for guidance only. They may vary with colour and general production tolerances.
The following primers/intermediate coats are recommended for Interthane 990SG:
| Intercure 200 | Intergard 475HS |
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| Intercure 200HS | Interseal 1052 |
| Intercure 420 | Interseal 670HS |
| Intergard 251 | Interzinc 315 |
| Intergard 2511 | Interzinc 52 |
| Intergard 251HS | Interzinc 52HS |
| Intergard 269 | Interzone 954Interthane 990SG is suitable for self-recoating only. |
For more suitable primers/intermediate coats/topcoats, contact International.
| 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 | 17.14 L | 20 L | 2.86 L | 3.7 L |
| 5 L | 4.29 L | 5 L | 0.71 L | 1 L |
For other packaging sizes, contact AkzoNobel.
| Packaging Specifications | Component A | Component B |
| 20 L | 26.9 kg | 3.5 kg |
| 5 L | 7 kg | 0.9 kg |
| Shelf life | At 25°C (77°F): Component A 24 months, Component B 18 months. Inspection is required thereafter. Store in a dry, cool environment, away from heat and ignition sources. |
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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.
