Intertherm 875 Silicone Acrylic Heat-resistant Paint is a heat-resistant coating in the acrylic system. Used in various industrial environments including petrochemical plants, refineries, offshore structures, chemical plants and power stations. A one-component medium-temperature-resistant topcoat based on heat-resistant ketone and acrylic resins with heat-resistant pigments. Zinc-rich epoxy primer, used at temperatures up to 150 °C (300 °F), also provides satisfactory corrosion protection; this coating is air-drying and suitable for application in fabrication shops and on site without baking facilities. Parameters on this page: dry film thickness 25–40 µm (1–1.6 mils); theoretical spreading rate 15.60 m²/L; number of components: one.
Source: AKZONOBEL original technical data sheet (TDS) 'Intertherm 875 Silicone Acrylic Heat-resistant Paint'. 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 | 39% |
|---|---|
| Dry Film Thickness | 25–40 µm (1–1.6 mil) |
| Theoretical Spreading Rate | 15.60 m²/L |
| VOC | 4.68 lb/gal (562 g/L), US EPA Method 24, 534… |
| Density / Specific Gravity | 1.07 kg/L (8.9 lb/gal) |
| Number of Components | One-component |
| Flash Point | 24°C (75°F) |
| Thinner | Do not exceed the thinning limits of local environmental regulations |
| Mixing Ratio | N/A |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
A one-component medium-temperature-resistant topcoat based on heat-resistant ketone and acrylic resins with heat-resistant pigments.
Used in various industrial environments including petrochemical plants, refineries, offshore structures, chemical plants and power stations. Suitable for areas at moderate temperature requiring a coloured topcoat.
A heat-resistant topcoat for application to suitably primed steel structures. Can be used on new structures and as a maintenance coating.
Suitable for steel structures operating at up to 260 °C (500 °F). No heat curing between coats is required; withstands high temperature without discolouration or mottling.
| Colour | Available in a limited range of colours: INTERTHERM 875 |
|---|---|
| Gloss | |
| Volume Solids | 39% |
| Typical thickness | Dry film thickness 25–40 µm (1–1.6 mils), equivalent to wet film thickness 64–103 µm (2.6–4.1 mils) |
| Theoretical Spreading Rate | At 25 µm dry film thickness and the stated volume solids: 15.60 m²/L; at 1 mil dry film thickness and the stated volume solids: 626 ft²/US gal |
| Practical Spreading Rate | Allowing for a suitable loss factor |
| Application Methods | Air spray, brush, roller. Drying time; recommended topcoat recoat interval |
| Temperature | Surface Dry | Hard Dry | Minimum | Maximum |
| 10°C (50°F) | 60 min | 3 h | 4 h | Unlimited¹ |
| 15°C (59°F) | 45 min | 2 h | 3 h | Unlimited¹ |
| 25°C (77°F) | 30 min | 90 min | 2 h | Unlimited¹ |
| 40°C (104°F) | 10 min | 45 min | 1 h | Unlimited¹ |
¹ See Definitions and Abbreviations from the International Paint Protective Coatings division.
| Flash point (typical) | 24°C (75°F) |
|---|---|
| Product weight | 1.07 kg/L (8.9 lb/gal) |
| Volatile Organic Compounds | 4.68 lb/gal (562 g/L), US EPA Method 24; 534 g/kg, EU Solvent Emissions Directive (Council Directive 2010/75/EU); coating hazard GB 30981.2-S-Pb≤1000-NC; complies with GB 30981.2-2025. 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 8504:2019.
Oil and grease must be removed in accordance with the SSPC-SP1 solvent cleaning standard.
Abrasive blast-clean to Sa 2½ (ISO 8501-1:2007) or SSPC-SP10. If oxidation occurs between blasting and application of Intertherm 875, re-blast the surface to the specified visual standard.
Surface defects exposed during abrasive blasting must be ground, filled or treated by a suitable method.
Intertherm 875 can be applied over approved anti-corrosive primers. The primer surface must be dry and free of contaminants. Intertherm 875 must be applied within the specified recoat interval (refer to the relevant product data sheet).
With zinc-rich primers, remove weld spatter where necessary, smooth welds and sharp edges, and blast-clean welds and damaged primer to Sa 2½ (ISO 8501-1:2007) or SSPC-SP10. Shop-primed or other primer surfaces must be dry and free of contaminants (e.g. oil, grease, salts) and recoated with Intertherm 875 within the specified primer recoat interval (refer to the relevant data sheet).
Welds and damaged areas should be blast-cleaned to Sa 2½ (ISO 8501-1:2007) or SSPC-SP10; before recoating, ensure the zinc-rich primer is fully cured, clean and dry. If the shop primer shows extensive or widespread damage, a full sweep blasting may be required.
| Mixing | This product is a single-component coating; stir thoroughly with a power mixer before each use |
|---|---|
| Mixing ratio | N/A |
| Suitable for airless spray | Not recommended |
| Air Spray | Recommended | Spray gun | DeVilbiss MBC or JGA |
| Air nozzle | 704 or 765 | ||
| (with pressure pot) | Nozzle | E | |
| Air spray (conventional) | Recommended | Use suitable dedicated equipment. | |
| Brush | Applicable — for small-area repair only | Typical thickness 25 µm (1.0 mil) | |
| Roller application | Applicable — for small-area repair only | Typical thickness 25 µm (1.0 mil) | |
| Thinner | International GTA007 | Do not exceed the thinning limits of local environmental regulations |
(International GTA013)
| Cleaner | International GTA007 |
|---|---|
| Interruption of work | Flush all equipment thoroughly with International GTA007. All unused paint must be stored in tightly closed containers. |
Partly filled containers may develop skinning and/or increased viscosity during storage. Strain the paint before use.
| 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.
For optimum corrosion protection at up to 260 °C (500 °F), apply Intertherm 875 over an inorganic zinc silicate primer. A mist coat over the inorganic zinc silicate is recommended, followed by a full coat of Intertherm 875 at 40 µm (1.6 mils) dry film thickness. If both coats are heavy, pinholes may sometimes appear in the topcoat.
When recoating weathered zinc silicate primer, the surface must be clean, free of contaminants and free of zinc corrosion products such as zinc salts.
Zinc-rich epoxy primer, used at temperatures up to 150 °C (300 °F), also provides satisfactory corrosion protection. This coating is air-drying and suitable for application in fabrication shops and on site without baking facilities.
Over-application at high temperature can cause blistering.
At high temperature, slight changes in colour and gloss may occur.
Note: a white topcoat kept at 260 °C (500 °F) for too long may show some yellowing.
Intertherm 875 withstands a maximum continuous dry temperature of 260 °C (500 °F).
Intertherm 875 can be applied to substrates with a surface temperature up to 40 °C (104 °F). Note: the VOC value is the maximum possible for the product and 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.
This specialized coating is normally used without a topcoat and is compatible with only a few primers.
Suitable primers:
| Interzinc 12 | Continuous dry heat up to 260 °C (500 °F) |
|---|---|
| Interzinc 22 | Continuous dry heat up to 260 °C (500 °F) |
| Interzinc 52 | Continuous dry temperature up to 150 °C (300 °F) |
| Interzinc 315 | Continuous dry temperature up to 150 °C (300 °F). For other suitable primers, 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 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 | ||
| Volume | Packaging | |
| 20 L | 20 L | |
| 5 US gal | 5 US gal |
For other packaging sizes, contact AkzoNobel.
Packaging Specifications
| 20 L | 23.4 kg |
|---|---|
| 5 US gal | 53.6 lb |
| Shelf life | At 25 °C, a minimum of 24 months, after which inspection is required. Store in a dry, cool place away from heat sources and ignition sources. |
|---|
© 2026/5/27 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.
