Interfine 691 modified acrylic topcoat is an acrylic coating used as a topcoat. Suitable for various corrosive environments, including offshore structures, petrochemical facilities, bridges, pulp and paper mills, and power plants. Two-component, isocyanate-free epoxy-modified acrylic decorative topcoat with good long-term weather resistance. When recoating weathered or aged surfaces, before applying the next coat of Interfine 691, ensure the coating is completely clean and free from all surface contamination such as grease, salt particles, traffic film and chalking. Parameters on this page: volume solids 53% ± 3% (depending on colour), theoretical spreading rate 10.60 m²/L, number of components two-component.
Source of parameters: AKZONOBEL manufacturer's Technical Data Sheet (TDS) "Interfine 691 modified acrylic 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 | 53% ± 3% (depending on colour) |
|---|---|
| Dry Film Thickness | — |
| Theoretical Spreading Rate | 10.60 m²/L |
| VOC | 3.41 lb/gal (409 g/L) US Environmental Protection Agency Method 24 286… |
| Density / Specific Gravity | 1.40 kg/L (11.7 lb/gal) depending on |
| Number of Components | Two-component |
| Thinner | In other environments, use International GTA007, not exceeding 5%. Do not |
| Mixing Ratio | 2 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, isocyanate-free epoxy-modified acrylic decorative topcoat with good long-term weather resistance. Interfine 691 provides performance equivalent to commonly used recoatable polyurethane decorative topcoats.
Designed as a topcoat for new-build industrial projects and maintenance. Suitable for a variety of corrosive environments such as offshore structures, petrochemical facilities, bridges, pulp and paper mills, and power plants. Suitable for both site application and shop application; the ideal coating for projects where regulations prohibit the use of isocyanate-containing materials.
| Colour | A wide range of colours can be produced through the Chromascan tinting system. |
|---|
INTERFINE 691
| Gloss | High gloss |
|---|---|
| Volume Solids | 53% ± 3% (depending on colour) |
| Typical thickness | A 50 µm (2 mil) dry film corresponds to a 94 µm (3.8 mil) wet film |
| Theoretical Spreading Rate | 10.60 m²/L at 50 µm dry film thickness and the stated volume solids; 425 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 | Airless Spray, Brush, Conventional Spray, Roller; drying time and recoat interval |
| Temperature | Surface Dry | Hard Dry | Minimum | Maximum |
| -5°C (23°F) | 6 h | 26 h | Unlimited¹ | |
| 5°C (41°F) | 4 h | 22 h | Unlimited¹ | |
| 25°C (77°F) | 2 h | 8 h | Unlimited¹ | |
| 35°C (95°F) | 1 h | 6 h | Unlimited¹ | |
¹ See Definitions and Abbreviations from the International Paint Protective Coatings division.
| Flash point (typical) | Component A 29°C (84°F); Component B 28°C (82°F); mixed 29°C (84°F) |
|---|---|
| Product weight | 1.40 kg/L (11.7 lb/gal) depending on colour |
| Volatile Organic Compounds | 3.41 lb/gal (409 g/L) US EPA Method 24, 286 g/kg EC 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 more detailed information, 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.
Pre-primed surfaces: Interfine 691 should always be applied over the recommended anticorrosive primer. The primer surface should be dry and free from any contaminants; Interfine 691 must be applied within the specified recoat interval (refer to the relevant product data sheet).
Areas of breakdown, damage and similar areas should be prepared to the grade specified by the standard (e.g. Sa2½ (ISO 8501-1:2007), SSPC SP6, or SSPC SP11) and the primer repaired before applying Interfine 691.
| 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 | 2 parts : 1 part (by volume) |
|---|
| Pot life | -5°C (23°F) | 5°C (41°F) | 25°C (77°F) | 35°C (95°F) |
| 8 h | 7 h | 6 h |
| 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 (conventional) | Recommended | Use suitable dedicated equipment.. |
| Brush | Suitable | Typical thickness 30–50 µm (1.2–2.0 mil) |
| Roller application | Suitable | |
| Thinner | Not recommended | In other environments, use International GTA007, not exceeding 5%. Do not |
Should any other thinner be used.. dilution must not exceed the limits of local environmental regulations
| Cleaner | International GTA007 |
|---|---|
| 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 delays, and other factors. |
All surplus paint and empty containers must be disposed of in accordance with the relevant local laws/regulations.
Gloss and surface smoothness depend on the application method. Avoid mixing different application methods wherever possible. A consistent application method gives the desired result. Conventional air spray usually gives the desired gloss and appearance.
When brush and roller are used for the desired appearance, two coats of Interfine 691 may be required for some colours to achieve uniform coverage. Even bright oranges and yellows use lead-free pigments. Practice has shown that a colour-compatible intermediate coat or anticorrosive coating is suitable beneath Interfine 691.
When recoating over weathered or aged surfaces, ensure the coating is completely clean and free from all surface contamination such as grease, salt particles, traffic film and chalking before applying the next coat of Interfine 691.
The temperature of the surface to be coated must be at least 3 °C (5 °F) above the dew point.
Condensation occurring during or immediately after application can cause the topcoat to lose gloss and/or change colour.
Premature exposure to standing water may cause colour change, especially for dark colours and at low temperatures.
Ensure adequate ventilation when applying Interfine 691 in confined spaces.
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 Interfine 691:
| Intercure 200 | Intercure 200HS |
|---|---|
| Intercure 384 | Intercure 420 |
| Intergard 233 | Intergard 251 |
| Intergard 269 | Intergard 400 |
| Intergard 410 | Intergard 475HS |
| InterH2O 499 | Interplus 356 Interseal 670HS Intershield 300 Interfine 691 is suitable for recoating over 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 also available as separate publications on request. |
|---|
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.
| Packaging Specifications | Component A | Component B | ||
| Volume | Packaging | Volume | Packaging | |
| 15 L | 10 L | 20 L | 5 L | |
For other packaging sizes, contact AkzoNobel.
| Packaging Specifications | Component A | Component B |
| 15 L | 17.28 kg | 5.46 kg |
| 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. |
|---|
Storage temperature must not exceed 35°C (95°F).
© 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.
