Interzinc 72 Epoxy Zinc-rich Primer belongs to zinc-rich primers, epoxy coating system. As a shop or field-applied primer for high-performance coating systems to protect steel in aggressive environments (e.g., offshore facilities, refineries, petrochemical and chemical plants, power stations, bridges, pulp and paper mills). A two-component, metallic zinc-rich epoxy primer that provides excellent corrosion protection both as a single coat and as a primer in high-performance systems. Overapplication of Interzinc 72 will extend the minimum recoat time and handling time, adversely affecting long-term recoatability. Parameters on this page: dry film thickness 50–75 µm (2–3 mils), theoretical spreading rate 8 m²/L, number of components two-component.
Parameter source: AkzoNobel AKZONOBEL original technical data sheet (TDS) 'Interzinc 72 Epoxy Zinc-rich Primer'; 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 | 60% |
|---|---|
| Dry Film Thickness | 50–75 µm (2–3 mils) |
| Theoretical Spreading Rate | 8 m²/L |
| VOC | 149 g/kg EU solvent emission directive content (EU Council Directive 2010/75… |
| Density / Specific Gravity | 2.77 kg/L (23.1 lb/gal) |
| Number of Components | Two-component |
| Thinner | Do not exceed the thinning limits of local environmental regulations |
| Mixing Ratio | 4.0 parts : 1.0 part (by volume) |
| Colour / Appearance | Grey, INTERZINC 72 |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
A two-component, metallic zinc-rich epoxy primer that provides excellent anticorrosive performance both as a single coat and as a primer in high-performance systems. Zinc dust content in the dry film is 90%.
As a shop or field-applied primer for high-performance coating systems to protect steel in aggressive environments (e.g. offshore installations, refineries, petrochemical and chemical plants, power stations, bridges, pulp and paper mills).
| Colour | Grey, INTERZINC 72 |
|---|---|
| Gloss | Matt |
| Volume Solids | 60% |
| Typical thickness | Dry film thickness 50–75 µm (2–3 mils) corresponds to wet film thickness 83–125 µm (3.3–5 mils) |
| Theoretical Spreading Rate | 8 m²/L at 75 µm dry film thickness and the stated volume solids; 321 ft²/US gal at 3 mil dry film thickness and the stated volume solids |
| 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 |
| 10°C (50°F) | 45 min | 6 h | 8 h | Unlimited¹ |
| 15°C (59°F) | 35 min | 4 h | 6 h | Unlimited¹ |
| 25°C (77°F) | 25 min | 90 min | 4 h | Unlimited¹ |
| 40°C (104°F) | 20 min | 45 min | 2 h | Unlimited¹ |
¹ See Definitions and Abbreviations from the International Paint Protective Coatings division.
| Flash point (typical) | Component A 32 °C (90 °F); Component B 33 °C (91 °F); Mixed 32 °C (90 °F) |
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| Product weight | 2.77 kg/L (23.1 lb/gal) |
| Volatile Organic Compounds | 149 g/kg EU Solvent Emissions Directive content (Council Directive 2010/75/EU) Coating hazard GB 30981.2-S-Pb≤1000-NC complies with GB 30981.2-2025. For more detailed information, see the "Product Characteristics" section. |
All surfaces to be painted must be clean, dry and free of contaminants. Before painting, all surfaces must be assessed and prepared in accordance with ISO 8504-1.
Oil and grease must be removed in accordance with the SSPC-SP1 solvent cleaning standard.
Abrasive blasting: blast clean to Sa2½ (ISO 8501-1:2007) or SSPC-SP6 standard. If oxidation occurs between blast cleaning and application of Interzinc 72, the surface shall be re-blast cleaned to the specified visual standard.
Surface defects exposed by abrasive blasting must be ground, filled or treated by another suitable method.
Recommended surface roughness 40–75 µm (1.5–3.0 mils).
Shop-primed steel structures: Interzinc 72 is suitable for application to steel components newly coated with zinc silicate shop primer.
If the zinc dust shop primer shows large-scale scattered breakdown or heavy zinc salts, the entire area must be fully sweep blasted.
Not suitable for recoating other types of shop primer; remove them completely by abrasive blasting.
Welds and damaged areas must be blast cleaned to Sa 2½ (ISO 8501-1:2007) or SSPC-SP6.
| 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. |
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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 | 4.0 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) |
| 12 h | 10 h | 8 h | 5 h |
| Suitable for airless spray | Recommended: nozzle diameter 0.43–0.53 mm (17–21 thousandths of an inch); total paint pressure at the nozzle not less than 176 kg/cm² (2503 psi) |
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| Air Spray | May require thinning | Spray gun | DeVilbiss MBC or JGA |
| Air nozzle | 704 or 765 | ||
| (with pressure pot) | Nozzle | E | |
| Brush | Applicable — for small-area repair only | Typical thickness 40–50 µm (1.6–2.0 mils) | |
| Roller application | Applicable — for small-area repair only | Typical thickness 40–50 µm (1.6–2.0 mils) | |
| Thinner | International GTA220 | Do not exceed the thinning limits of local environmental regulations |
| Cleaner | International GTA822 |
|---|---|
| Interruption of work | Do not leave paint in hoses, spray guns or spray equipment. Flush all equipment thoroughly with International thinner. |
Mixed paint should not be resealed. If work is interrupted for too long, mix a fresh batch of paint 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. |
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All surplus paint and empty containers must be disposed of in accordance with the appropriate local laws/regulations.
To ensure good anticorrosive performance, it is essential that the minimum dry film thickness of the coating system reaches 40 µm (1.5 mils). To obtain a uniform film at this thickness, thinning with approximately 10% International thinner is required.
When Interzinc 72 is applied by brush or roller, multiple coats are necessary to achieve the specified total system dry film thickness.
The temperature of the surface to be coated must be at least 3 °C (5 °F) above the dew point.
This product does not cure adequately below 5 °C (41 °F). For optimum performance, curing should take place above 10 °C (50 °F).
When Interzinc 72 is used as the primer for coating systems subject to immersion, a minimum dry film thickness of 65 µm (2.5 mils) must be ensured to provide sufficient anticorrosive performance.
Over-application of Interzinc 72 will extend the minimum recoating time and handling time, adversely affecting long-term recoating performance.
Avoid excessive film thickness, otherwise cracking may occur when recoated with a high-build coating.
If Interzinc 72 is exposed to outdoor environments before topcoating, ensure all zinc salts are removed prior to coating application and select a compatible recommended topcoat.
Interzinc 72 is not suitable for exposure to acidic or alkaline environments.
This product holds the following specification approvals: • BS5493 (1977): DF and KP1B • BS4652:1995 • British Gas Specification PA9 and PA10. Note: VOC value is typical and for guidance only. The value may vary depending on factors such as colour differences and normal manufacturing tolerances.
Interzinc 72 can be recoated with a wide range of high-performance coatings, including:
| Intercure 200 | Intergard 411 |
|---|---|
| Intercure 420 | Intergard 475HS |
| Intercure 422 | Interseal 670HS |
| Intergard 251 | Intersheen 73 |
| Intergard 269 | Intertuf 708 |
| Intergard 400 | Interzone 505 |
| Intergard 405 | Interzone 954 Intergard 410 For other suitable primers/topcoats, consult International Paint. |
| 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. |
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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 | |
| 10 L | 8 L | 10 L | 2 L | 2.5 L |
For other packaging sizes, contact AkzoNobel.
| Packaging Specifications | Component A | Component B |
| 10 L | 27.3 kg | 2.1 kg |
| Shelf life | At 25 °C (77 °F), Component A: 12 months, Component B: 18 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.
