Interthane 990HS Durable High-gloss Topcoat is a polyurethane coating used as a topcoat. A durable high-gloss topcoat for exposed steelwork in various corrosive environments (including chemical and petrochemical plants, offshore installations, bridges, pulp and paper mills, power plants and refineries). A low-VOC, two-component acrylic polyurethane high-performance topcoat with good gloss and colour retention under exterior exposure, for use over correctly prepared primed surfaces. For advice, contact International Industrial Coatings. Parameters on this page: volume solids 68% ± 3% (depending on colour); dry film thickness 50–75 µm (2–3 mils); theoretical spreading rate 13.60 m²/L.
Source: AKZONOBEL original technical data sheet (TDS) 'Interthane 990HS Durable High-gloss 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 | 68% ± 3% (depending on colour) |
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| Dry Film Thickness | 50–75 µm (2–3 mils) |
| Theoretical Spreading Rate | 13.60 m²/L |
| VOC | 2.72 lb/gal (327 g/L), US EPA Method 24, about… |
| Density / Specific Gravity | 1.50 kg/L (12.5 lb/gal) |
| Number of Components | Two-component |
| Thinner | International GTA056 (or; thinning must not exceed local environmental… |
| Mixing Ratio | 9 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 low-VOC, two-component acrylic polyurethane high-performance topcoat with good gloss and colour retention under exterior exposure, for use over correctly prepared primed surfaces.
A durable high-gloss topcoat for exposed steelwork in various corrosive environments (including chemical and petrochemical plants, offshore installations, bridges, pulp and paper mills, power plants and refineries).
In new construction and maintenance projects, suitable for correctly prepared painted steel and masonry surfaces.
High application performance, environmental durability and chemical resistance. Good gloss and colour retention under exterior exposure.
| Colour | A wide range of colours can be produced through the Chromascan tinting system. |
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INTERTHANE 990HS
| Gloss | High gloss |
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| Volume Solids | 68% ± 3% (depending on colour) |
| Typical thickness | Dry film thickness 50–75 µm (2–3 mils), equivalent to wet film thickness 74–110 µm (3–4.4 mils) |
| Theoretical Spreading Rate | At 50 µm dry film thickness and the stated volume solids: 13.60 m²/L; at 2 mils dry film thickness and the stated volume solids: 545 ft²/US gal |
| Practical Spreading Rate | Allowing for a suitable loss factor |
| Application Methods | Suitable for airless spray, air spray, brush, roller. Drying time; self-recoat interval |
| Temperature | Surface Dry | Hard Dry | Minimum | Maximum |
| 10°C (50°F) | 3.5 h | 30 h | 30 days | |
| 15°C (59°F) | 3 h | 22 h | 30 days | |
| 25°C (77°F) | 2 h | 12 h | 30 days | |
| 40°C (104°F) | 1 h | 4 h | 30 days | |
| Flash point (typical) | Component A 38 °C (100 °F); component B 57 °C (135 °F); after mixing 39 °C (102 °F) |
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| Product weight | 1.50 kg/L (12.5 lb/gal) |
| Volatile Organic Compounds | 2.72 lb/gal (327 g/L), US EPA Method 24. 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 8504:2000.
Primed surfaces: Interthane 990HS should always be applied over a recommended anti-corrosive primer. The primer surface must be dry and free of contaminants, and Interthane 990HS 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 990HS.
| 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 | 9 parts : 1 part (by volume) |
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| Pot life | 10°C (50°F) | 15°C (59°F) | 25°C (77°F) | 40°C (104°F) |
| 7 h | 6 h | 3 h | 1 h |
| Suitable for airless spray | Recommended nozzle tip 0.38–0.48 mm (15–19 thousandths of an inch); total paint pressure at the nozzle not less than 141 kg/cm² (2005 lb/in²) |
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| Air Spray | Recommended | Spray gun | DeVilbiss MBC or JGA |
| Air nozzle | 704 or 765 | ||
| (with pressure pot) | Nozzle | E | |
| Brush | Applicable | Typical thickness 40–50 µm (1.6–2.0 mils) | |
| Roller application | Applicable | Typical thickness 40–50 µm (1.6–2.0 mils) |
| Thinner | International GTA056 (or International GTA713; thinning must not exceed local environmental regulation limits) |
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| Cleaner | International GTA056 (or International GTA713) |
| Interruption of work | Do not leave paint in hoses, spray guns or spray equipment. Flush all equipment thoroughly with International GTA056. Mixed paint should not be re-sealed. If work is interrupted for a long period, use freshly mixed paint when work resumes. |
| Cleaning | Clean all equipment with International GTA056 immediately after use. Periodic flushing of spray equipment during application is also recommended. The frequency of cleaning depends on the quantity sprayed, temperature and time, including all interruptions. |
Surplus paint and empty containers must be disposed of in accordance with the relevant local regulations.
Gloss and surface finish depend on the application method. Mixing different application methods should be avoided as far as possible. Air spray gives the best gloss and appearance. With brush and roller, for some colours two coats of Interthane 990HS may be required for a uniform finish, especially over dark primers or with certain lead-free bright colours such as yellow and orange. The ideal practice is to use a colour-matched intermediate or anti-corrosive coat beneath Interthane 990HS.
Applied at high film thickness (above 100 µm / 4 mils), the appearance may be affected by surface defects. At low dry film thickness (40 µm / 1.6 mils), the coating has insufficient hiding power, leading to an uneven appearance with some colours.
Over-application of Interthane 990HS extends the minimum recoat and handling times and adversely affects long-term recoating performance.
If the surface temperature exceeds 40 °C (104 °F) for more than 72 hours, prepare the surface before applying the next coat of Interthane 990HS. At any surface temperature, additional surface preparation is required when the overcoating interval exceeds 30 days. For advice, contact International Industrial Coatings.
Applying Interthane 990HS at very high relative humidity or in condensation-prone environments may cause immediate or premature loss of gloss. The recommended relative humidity during application and curing is not above 85%, with the surface temperature at least 3 °C (5 °F) above the dew point.
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.
This product holds the following approvals: • USDA accepted for food contact in federally inspected meat and poultry plants.
Approved by the chief plant inspector. Note: the VOC value is a typical value for guidance only. It may vary with colour and normal production tolerance.
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 990HS:
| Intercure 200 | Interplus 880 |
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| Intercure 420 | Interseal 670HS |
| Intergard 251 | Interzinc 42 |
| Intergard 269 | Interzinc 52 |
| Intergard 475HS | Interzinc 315 |
| InterH2O 401 | Interzone 505 |
| Interplus 256 | Interzone 954 |
| Interplus 356 | Interzone 1000, Interplus 770. Designed 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 available on request. |
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This product is intended for application only by professional applicators in the industrial sector, in accordance with the recommendations in this manual, the Material Safety Data Sheet and on the container packaging. 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, consult International Paint.
Warning: contains isocyanates. Wear an air-fed helmet when spraying.
| Packaging Specifications | Component A | Component B | ||
| Volume | Packaging | Volume | Packaging | |
| 5 US gal | 4.5 US gal | 5 US gal | 0.5 US gal | 1 US gal |
| 20 L | 18 L | 20 L | 2 L | 2.5 L |
For other available packaging sizes, contact International Paint.
| Packaging Specifications | Component A | Component B |
| 5 US gal | 61.1 lb | 4.4 lb |
| 20 L | 29.7 kg | 2.5 kg |
| Shelf life | Minimum 24 months at 25 °C (77 °F) (Component A) & 12 months (Component B). 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.
