Intertherm 181 Specially Designed is a heat-resistant coating. An ideal product for the petrochemical industry, particularly suited to refineries and offshore structures, where a single-coat system can be used to coat large quantities of insulated and non-insulated pipework, reducing the complexity of work scheduling. A two-component, high-temperature-resistant topcoat based on inorganic silicate technology. Although the low-molecular-weight reactive additive becomes part of the film on curing under normal ambient conditions, EPA Method 24 analysis shows that it also affects the VOC value. Parameters on this page: dry film thickness 100–125 µm (4–5 mil), theoretical spreading rate 5.50 m²/L, number of components two.
Source: AkzoNobel original technical data sheet (TDS) "Intertherm 181 Specially Designed"; spreading rate and other values 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 | 69% |
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| Dry Film Thickness | 100–125 µm (4–5 mil) |
| Theoretical Spreading Rate | 5.50 m²/L |
| VOC | 3.42 lb/gal (410 g/L) US EPA Method 24 33… |
| Density / Specific Gravity | 1.65 kg/L (13.8 lb/gal) |
| Number of Components | Two-component |
| Thinner | Do not exceed the thinning limits of local environmental regulations |
| Mixing Ratio | 39.0 parts : 1.0 part (by volume) |
| Colour / Appearance | Grey, white, INTERTHERM 181 |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
A two-component, high-temperature-resistant topcoat based on inorganic silicate technology.
Intertherm 181 is specially designed for application over inorganic zinc primers; it is a single-coat system for protecting pipework subject to continuous operating temperatures up to 400 °C (752 °F) and intermittent temperatures up to 500 °C (932 °F) from corrosion.
An ideal product for the petrochemical industry, particularly suited to refineries and offshore structures, where a single-coat system can be used to coat large quantities of insulated and non-insulated pipework, reducing the complexity of work scheduling.
| Colour | Grey, white, INTERTHERM 181 |
|---|---|
| Gloss | Matt |
| Volume Solids | 69% |
| Typical thickness | Dry film 100–125 µm (4–5 mil), equivalent to wet film 145–181 µm (5.8–7.2 mil) |
| Theoretical Spreading Rate | At 125 µm dry film thickness and the stated volume solids, 5.50 m²/L; at 5 mil dry film thickness and the stated volume solids, 221 ft²/US gal |
| Practical Spreading Rate | Allowing for a suitable loss factor |
| Application Methods | Airless spray, air spray. Drying time: recommended topcoat overcoating interval |
| Temperature | Surface Dry | Hard Dry | Minimum | Maximum |
| 10°C (50°F) | 60 min | 4 h | N/A | |
| 15°C (59°F) | 30 min | 2.5 h | N/A | |
| 25°C (77°F) | 15 min | 1.5 h | N/A | |
| 40°C (104°F) | 10 min | 45 min | N/A | |
| Flash point (typical) | Component A 16 °C (61 °F); Component B 20 °C (68 °F); mixed 16 °C (61 °F) |
|---|---|
| Product weight | 1.65 kg/L (13.8 lb/gal) |
| Volatile Organic Compounds | 3.42 lb/gal (410 g/L) US EPA Method 24. 338 g/kg. EU Solvent Emissions Directive, 1999 Commission Directive No. 13. For further details, 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 8504:2000.
Oil and grease must be removed in accordance with the SSPC-SP1 solvent cleaning standard.
Substrates pre-primed with zinc primer: Intertherm 181 shall always be applied over the recommended zinc primer.
Intertherm 181 is suitable for application on steel structures freshly coated with zinc silicate primer.
If the zinc silicate primer shows large-area damage or excessive zinc corrosion products, the entire area shall be sweep-blasted. Other types of shop primer are not suitable for overcoating and shall be completely removed by abrasive blasting.
Welds and damaged areas shall be blast cleaned to Sa 2½ (ISO 8501-1:2007) or SSPC SP6 (or to SSPC SP10 for ideal performance), then re-coated with zinc silicate primer.
Before applying Intertherm 181, ensure the primer surface is clean, dry and free from contaminants and zinc salts. Before overcoating, ensure the zinc primer is fully cured.
| Mixing | Intertherm 181 must be applied in accordance with the detailed Intertherm 181 application procedure recommended by International Paint. |
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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 | 39.0 parts : 1.0 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) |
| 2 h | 1.5 h | 1 h |
| Suitable for airless spray | Recommended: nozzle diameter 0.53–0.89 mm (21–35 mil); total paint pressure at the nozzle not less than 126 kg/cm² (1792 psi) |
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| Air spray (conventional) | Recommended: use suitable specialised equipment. Spray gun DeVilbiss MBC or JGA; air cap 30; fluid tip E. For further details, see the "Product Characteristics" section. |
| Brush | Applicable — for small-area repair only | Typical thickness 75 µm (3.0 mils) |
| Roller application | Not recommended | |
| Thinner | International GTA007 | Do not exceed the thinning limits of local environmental regulations |
| Cleaner | International GTA220 | (or International GTA415) |
| Interruption of work | Do not leave paint in hoses, spray guns or spray equipment. Flush all equipment thoroughly with International GTA220. |
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Once mixed, paint should not be resealed. If work is interrupted for too long, mix a fresh batch for application.
| Cleaning | All equipment shall be cleaned with International GTA 220 immediately after use. Periodically flushing spray equipment during the daily work is good practice. The frequency of cleaning depends on the quantity sprayed, temperature, spraying time and interruptions. |
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All surplus paint and empty containers must be disposed of in accordance with the relevant local laws/regulations.
Before use, refer to the detailed Intertherm 181 application procedure.
The airless and conventional spray equipment above is for reference only; equipment from other manufacturers may also be used. Airless spray gives ideal results and normally requires no thinner. For conventional spray application, thinning is required for ideal spray performance, using up to 10% GTA007.
Intertherm 181 reacts with atmospheric moisture, so containers shall always be kept covered. Uncovered containers lead to skinning and loss of pot life.
Intertherm 181 should not increase in viscosity even after a long mixing time. However, if the specified pot life is exceeded, the cured film has poorer performance and does not reach the specified performance grade.
The surface temperature must always be maintained at least 3 °C (5 °F) above the dew point.
When applying Intertherm 181 in confined spaces, ensure adequate ventilation.
To achieve ideal curing and film strength, apply a sufficiently wet film to minimise overspray. Ideally, apply by airless spray with the gun close to the substrate and moving slowly.
Curing time depends on the relative humidity during curing. Below 65% relative humidity, curing time increases, depending on the ambient temperature and relative humidity during application and curing. For details, consult International Paint.
Intertherm 181 is suitable for protecting steel at continuous dry temperatures up to 400 °C (752 °F) and intermittent surge temperatures up to 500 °C (932 °F).
High-temperature resistance is achieved only after the film is fully cured. The degree of cure depends on temperature, humidity and film thickness. Normally, a 125 µm (5 mil) dry film at 25 °C (77 °F) and 65% relative humidity fully cures after 1 day, achieving ideal high-temperature resistance. Higher temperature shortens curing time, while lower temperature and humidity extend it.
After the final coat has cured hard, measure the dry film thickness of the system with a suitable non-destructive magnetic gauge and check the average total thickness of the applied system. The system shall be free of pinholes or other holidays. The cured film shall be free of sags, runs, drips and inclusions. All defects shall be repaired before the system is put into service. For the detailed repair procedure, refer to International Paint's Intertherm 181 "Application Procedure".
Note: the VOC value given is based on the maximum possible value for the product and 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 may be used in a system with Intertherm 181: Interzinc 12, Interzinc 22. For other suitable primers, consult International Paint.
When used in high-temperature environments, Intertherm 181 is normally not overcoated.
At operating temperatures below 150 °C (302 °F), Intertherm 181 may be overcoated for pipe marking. Consult International Paint for advice on new technologies.
| 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.
| Packaging Specifications | Component A | Component B | ||
| Volume | Packaging | Volume | Packaging | |
| 10 L | 9.75 L | 10 L | 0.25 L | 0.5 L |
| 5 US gal | 4.8 US gal | 5 US gal | 0.12 US gal | 0.13 US gal |
For other available packaging sizes, contact International Paint.
| Packaging Specifications | Component A | Component B |
| 10 L | 17.87 kg | 0.25 kg |
| 5 US gal | 73.1 lb | 1 lb |
| Shelf life | At 25 °C (77 °F), at least 6 months, after which inspection is required. Store in a dry, cool place away from heat sources 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.
