Interthane 870UHS Primer Surface belongs to polyurethane coatings and is used as a primer. It offers an additional option where a single coat of a conventional thin-film polyurethane topcoat cannot be applied over an intermediate coat. Low-VOC, high-solids, semi-gloss polyurethane topcoat with excellent colour and gloss retention on exterior exposure. Although low-molecular-weight reactive additives become part of the film under normal ambient curing, EPA Method 24 testing shows that they also affect the VOC value. Parameters on this page: volume solids 68% ± 3% (depending on colour), dry film thickness 75-125 µm (3-5 mils), theoretical spreading rate 5.40 m²/L.
Parameter source: AKZONOBEL original Technical Data Sheet (TDS) 'Interthane 870UHS Primer Surface'; 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% (depending on colour) |
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| Dry Film Thickness | 75–125 µm (3–5 mil) |
| Theoretical Spreading Rate | 5.40 m²/L |
| VOC | 1.91 lb/gal (230 g/L) US EPA Method 24 regarding… |
| Density / Specific Gravity | 1.45 kg/L (12.1 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.
Low VOC, high solids, semi-gloss polyurethane topcoat with excellent colour and gloss retention under exterior exposure. Apply to properly pretreated and primed surfaces.
VOC below 250 g/L, compliant with local VOC regulations.
Suitable for new construction projects and as an industrial maintenance topcoat. Interthane 870UHS can be used in various environments, including steel structure infrastructure such as large stadiums and airports, offshore structures, petrochemical equipment, bridges, pulp mills and power plants.
Specially designed for areas requiring a semi-gloss topcoat.
Provides an additional option for applications where single-coat application of a conventional thin-film polyurethane topcoat over an intermediate coat is not possible.
| Colour | A wide range of colours can be produced through the Chromascan tinting system. |
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INTERTHANE 870UHS Gloss Semi-gloss
| Volume Solids | 68% ± 3% (depending on colour) |
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| Typical thickness | Dry film thickness 75–125 µm (3–5 mils) equivalent to wet film thickness 110–184 µm (4.4–7.4 mils) |
| Theoretical Spreading Rate | At 125 µm dry film thickness and the stated volume solids, 5.40 m²/L. At 5 mils dry film thickness and the stated volume solids, 218 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 |
| 0°C (32°F) | 16 h | 30 h | Unlimited¹ | |
| 5°C (41°F) | 6 h | 20 h | Unlimited¹ | |
| 25°C (77°F) | 1.5 h | 6 h | Unlimited¹ | |
| 40°C (104°F) | 1 h | 4 h | Unlimited¹ | |
¹ See Definitions and Abbreviations from the International Paint Protective Coatings division.
| Flash point (typical) | Component A 38 °C (100 °F); Component B 50 °C (122 °F); Mixed 38 °C (100 °F) |
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| Product weight | 1.45 kg/L (12.1 lb/gal) |
| Volatile Organic Compounds | 1.91 lb/gal (230 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.
Pre-primed surfaces. Interthane 870UHS shall always be applied over the recommended anti-corrosive primer. The primer surface shall be dry and free from any contaminants. Interthane 870UHS must be applied within the specified recoating interval (refer to the relevant product data sheet).
Areas with cracks, damage, etc. shall be prepared to the grade specified by the standard (e.g. Sa2½ (ISO 8501-1:2007), SSPC SP6, or SSPC SP11) and the primer shall be repaired before application of Interthane 870UHS.
| Mixing | This product is supplied in two containers as one unit. Always mix the entire unit in the specified ratio. 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 | 0°C (32°F) | 5°C (41°F) | 25°C (77°F) | 40°C (104°F) |
| 7 h | 1.5 h | 30 min |
| Suitable for airless spray | Recommended: nozzle diameter 0.38–0.53 mm (15–21 thousandths of an inch); total paint pressure at the nozzle not less than 176 kg/cm² (2503 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) | Applicable | Use suitable dedicated equipment. | |
| Brush | Applicable | Typical thickness 50–75 µm (2.0–3.0 mils) | |
| Roller application | Applicable | Typical thickness 50–75 µm (2.0–3.0 mils) | |
| Thinner | International GTA056 | Do not exceed the thinning limits of local environmental regulations |
(or International GTA713)
| Cleaner | International GTA056 (or International GTA713) |
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| 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 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 and roller, the primer colour shall be selected to suit the colour of the final coat. Dark primers and micaceous iron oxide primers usually require two coats of Interthane 870UHS.
When Interthane 870UHS is applied by brush or roller, multiple coats are necessary to achieve the specified total system dry film thickness.
Applicators shall be aware that the ability of Interthane 870UHS to build one coat is affected by substrate temperature. At higher steel temperatures, the film build is lower and the resulting coating is thinner.
This product must be thinned only with the recommended International thinner. Other thinners, especially alcohol-containing thinners, severely inhibit the curing process.
Ensure adequate ventilation when applying Interthane 870UHS in confined spaces.
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 870UHS coats.
Do not apply when the steel temperature is below 5 °C (41 °F). The surface to be coated must be at least 3 °C (5 °F) above the dew point.
During application and curing, the relative humidity shall not exceed 85%.
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 of coatings applied over aged Interthane 870UHS is somewhat lower than that over a new coating, but still meets the requirements of the intended use.
This product is not recommended for immersion service. If severe chemical or solvent splashes are likely, contact International Paint for information on suitability.
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 Interthane 870UHS:
| Intercure 200HS | Interzinc 315 |
|---|---|
| Intergard 251 | Interzinc 52 |
| Intergard 475HS | Interzinc 52HS |
| Interplus 256 | Interzone 1000 |
| Interplus 356 | Interzone 505 |
| Interseal 670HS | Interzone 954. For other suitable primers/intermediate coats, consult International Paint. |
Designed to be recoated with the product itself
| 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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Warning: contains isocyanates. Wear an air-fed helmet when spraying.
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.
| Packaging Specifications | Component A | Component B | ||
| Volume | Packaging | Volume | Packaging | |
| 5 US gal | 4.38 US gal | 5 US gal | 0.63 US gal | 1 US gal |
For other available packaging sizes, contact International Paint.
| Packaging Specifications | Component A | Component B |
| 5 US gal | 57.5 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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The information given in this product data sheet is not exhaustive. Anyone who uses, for any purpose, any product other than those specifically recommended in this data sheet without first obtaining our written confirmation does so at their own risk as regards the suitability of the product for the intended purpose. Although to the best of our knowledge all advice or statements given about the product (whether in this data sheet or otherwise) are correct, we cannot control the quality or condition of the substrate, nor the many factors affecting the use and application of the product. Accordingly, unless we specifically agree otherwise in writing, we accept no liability, to the maximum extent permitted by law, for any product performance problem arising, or for any loss or damage caused by use of the product. We hereby disclaim any warranty or representation, express or implied, arising by operation of law or otherwise, including but not limited to any implied warranty of merchantability or fitness for a particular purpose. All products supplied and all technical guidance provided are subject to our standard terms and conditions of sale. You should obtain a copy of this document and read it carefully. The information contained in this product data sheet may be amended at any time in the light of experience and of our product development policy. Before using the product, it is the customer's responsibility to check with the local representative that the data sheet in their possession is the latest version.
This product data sheet is available on www.international-marine.com or www.international-pc.com and should be identical to this copy. If the version on the website differs from this one, the version on the website shall prevail.
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Packaging specifications and batch lead times are subject to actual availability. PleaseContact Uscontact us for project-based calculation.
