Intertherm 3350 acrylic thermal insulation coating is water-based. Intertherm 3350 provides a seamless, conformable thermal insulation film, eliminates some equipment associated with corrosion under insulation (CUI) monitoring systems, and reduces facility-wide CUI risk. Based on water-based acrylic technology and applied by airless spray, Intertherm 3350 can be used on substrates up to 177°C (350°F). Under normal room-temperature ambient conditions, on vertical surfaces, to prevent sagging, a first spray coat of 250 µm (10 mil) is recommended as a bonding layer. Parameters on this page: dry film thickness 400–500 µm (16–20 mil), theoretical spreading rate 1.56 m²/L, component count one-component.
Parameter source: AKZONOBEL manufacturer's Technical Data Sheet (TDS) "Intertherm 3350 Acrylic Thermal Insulation Coating"; values such as spreading rate are converted from TDS parameters and are for product 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 | 78% |
|---|---|
| Dry Film Thickness | 400–500 µm (16–20 mil) |
| Theoretical Spreading Rate | 1.56 m²/L |
| VOC | 0.08 lb/gal (10 g/L) US Environmental Protection Agency Method 24; for more… |
| Density / Specific Gravity | 0.63 kg/L (5.3 lb/gal) |
| Number of Components | One-component |
| Flash Point | >101°C (>214°F) |
| Thinner | Generally not required |
| Mixing Ratio | N/A |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
A one-component, thin-film, spray-applied thermal insulation coating with a wide range of applications. Based on water-based acrylic technology and applied by airless spray, Intertherm 3350 can be used on substrates up to 177°C (350°F).
Intertherm 3350 is an acrylic thermal insulation coating suitable for various applications requiring heat loss control and personnel protection.
Suitable for thermal insulation of large storage tanks, vessels, or piping systems. Ease of application and effective thin-film thermal insulation performance can improve production efficiency and reduce energy loss.
Intertherm 3350 provides efficient thermal insulation performance, is suitable for protecting personnel from burns by high-temperature equipment, reduces potential accidents, and improves safety during installation.
Intertherm 3350 provides a seamless, conformable thermal insulation film, eliminates part of the equipment associated with corrosion under insulation (CUI) monitoring systems, and reduces facility-wide CUI risk.
| Colour | White, grey INTERTHERM 3350 |
|---|---|
| Gloss | Matt |
| Volume Solids | 78% |
| Typical thickness | Dry film thickness 400–500 µm (16–20 mil) corresponds to wet film thickness 513–641 µm (20.5–25.6 mil). |
| Theoretical Spreading Rate | At 500 µm dry film thickness and the stated volume solids, 1.56 m²/L; at 20 mil dry film thickness and the stated volume solids, 63 ft²/US gal. |
| Practical Spreading Rate | Allowing for a suitable loss factor |
| Application Methods | Airless spray, air spray; drying time and recoat interval. |
| Temperature | Surface Dry | Hard Dry | Minimum | Maximum |
| 10°C (50°F) | 15 min | 45 min | 8.5 h | Unlimited¹ |
| 15°C (59°F) | 15 min | 40 min | 7.5 h | Unlimited¹ |
| 25°C (77°F) | 15 min | 30 min | 3 h | Unlimited¹ |
| 40°C (104°F) | 15 min | 30 min | 75 min | Unlimited¹ |
¹ Refer to International Paint's Industrial Protective Coatings division "Definitions and Abbreviations". All drying time data refer to measurements at a typical dry film thickness of 400 µm (16 mil), 50% relative humidity, and good ventilation.
| Flash point (typical) | >101°C (>214°F) |
|---|---|
| Product weight | 0.63 kg/L (5.3 lb/gal) |
| Volatile Organic Compounds | 0.08 lb/gal (10 g/L) US Environmental Protection Agency Method 24. For more detailed information, see the "Product Characteristics" section. |
All surfaces to be coated shall be clean, dry, and free of contaminants. Before coating, all surfaces shall be assessed and prepared in accordance with ISO 8504:2000; remove weld spatter and grind welds and sharp edges smooth. Oil and grease shall be removed in accordance with SSPC-SP1 solvent cleaning.
On steel structures with pre-applied primer, Intertherm 3350 shall always be applied over the recommended anti-corrosive primer. The primer surface shall be dry and free of contamination, and Intertherm 3350 shall be applied within the specified recoat interval (refer to the Intertherm 3350 application instructions).
Areas with cracking, damage, or other defects shall be abrasive blast cleaned to Sa 2.5 (ISO 8501-1:2007) or SSPC-SP6, or power tool cleaned to SSPC-SP11; these areas shall be primed before Intertherm 3350 is applied.
Before application on stainless steel, ensure the surfaces to be coated are clean, dry, and free of metal corrosion products. Abrasive blast with non-metallic, chloride-free abrasive (such as aluminium oxide or garnet) to obtain a surface profile of 25–32.5 µm (1.0–1.5 mil).
| Mixing | This product is a one-component coating. Stir thoroughly before use; refer to the application guide for details. Do not use mechanical vibration. |
|---|---|
| Mixing ratio | N/A |
| Suitable for airless spray | Recommended nozzle diameter 0.49–0.58 mm (19–23 mil); total paint pressure at the nozzle not less than 211 kg/cm² (3000 psi). |
| Air Spray | Applicable — for small-area repair only | Spray gun | DeVilbiss MBC or JGA |
| (with pressure pot) | Air nozzle | 62 | |
| Spray painting | AC | ||
| Brush | Not recommended | ||
| Roller application | Not recommended | ||
| Thinner | Generally not required |
| Cleaner | Clean water or International GTA991 |
|---|---|
| Interruption of work | Flush all equipment thoroughly with International GTA991. All unused coating shall be stored in closed containers. Partially filled containers may exhibit surface skinning and/or increased viscosity after storage. |
| Cleaning | Clean equipment thoroughly immediately after use with clean water and GTA 991. Flushing spray equipment periodically during application is recommended. Cleaning frequency depends on the volume sprayed, temperature and time, including all interruptions. |
Surplus paint and empty containers must be disposed of in accordance with the relevant regional regulations.
The typical single-coat film thickness of Intertherm 3350 is 500 µm (20 mil); multiple coats are required to achieve a typical system dry film thickness of 3000 µm (120 mil).
The dry film thickness requirement for Intertherm 3350 depends entirely on the performance expected under specific operating conditions and surrounding environment, and on the final use of the coating. To achieve the intended thermal insulation performance, the specified film thickness requirements must always be met.
During application, the steel surface temperature must not be below 10 °C, and must be at least 3 °C above the dew point.
For optimal application and drying performance, air and substrate temperature shall be above 10°C (50°F), and relative humidity below 80%.
Airless spray is the preferred method for applying a single coat to obtain maximum film thickness. Application by methods other than airless spray is unlikely to achieve the required film thickness. With air spray, multiple cross coats are required to reach maximum film thickness. With multiple spray coats, there is no upper limit on total film thickness.
Under normal ambient temperature conditions on vertical surfaces, apply an initial 250 µm (10 mil) pass as a tie coat to prevent sagging.
Peak operating temperature shall not exceed 190°C (375°F). Maximum continuous operating temperature shall not exceed 177°C (350°F). The cured coating shall not be exposed to temperatures below -51°C (-60°F).
Intertherm 3350 shall always be protected from freezing during storage and transport. The recommended storage temperature is 4°C (39°F) to 25°C (77°F).
Handling of frozen Intertherm 3350 shall comply with local regulations; do not thaw frozen paint for application.
Good air movement around the object to be coated is essential [minimum air velocity 0.1 m/s (4 in/s), maximum 0.5 m/s (20 in/s)]. Application at temperatures below 10°C (50°F) extends drying time and recoat intervals, as does high humidity.
At temperatures of approximately 30°C (86°F) with good ventilation, higher relative humidity can be tolerated; refer to the application guide.
Performance parameter Test method Test result
| Thermal conductivity | Thermal probe method | 0.070 W/m/K |
| Reflectance | ASTM E903 | 0.803 |
| Absorptivity | 0.197 |
Note: VOC values are typical and for guidance only. They may vary with colour and general production tolerances.
The product is designed primarily as a functional coating; however, it may be applied over the various solvent-borne primers listed below.
The maximum temperature resistance of coating systems based on Interbond 2340UPC, Intertherm 228HS, Interseal 670HS and Interzinc 52 may be limited by the temperature resistance of the primer; refer to the Intertherm 3350 application guide for further information.
Intertherm 3350 is normally recoated with itself; for other suitable topcoats, refer to the Intertherm 3350 application guide.
| For further information on the industry standards, terms and abbreviations used in this datasheet, see www.international-pc.com | The following documents available on the website: • Definitions and abbreviations • Application instructions • Surface preparation • Coating application • Theoretical and practical spreading rates. These sections are also available as separate reprints 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 | ||
| Volume | Packaging | |
| 5 US gal | 5 US gal |
For other packaging sizes, contact AkzoNobel.
Packaging Specifications
| 5 US gal | 61.7 lb |
|---|
| Shelf life | Minimum 18 months at 25 °C (77 °F). Thereafter, inspection is required. Store in a dry, cool environment away from heat and sources of ignition. |
|---|
©2025/8/20 AKZONOBEL. All rights reserved.
All registered trademarks mentioned in this publication are licensed to or owned by AkzoNobel.
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.
