Interzinc 42 Epoxy Zinc Powder Primer is a zinc-rich primer, an epoxy coating system. This zinc-containing primer can serve as part of a coating system to protect facilities in severely corrosive environments, widely applicable across many industries, such as offshore installations, petrochemical plants, pulp and paper mills, bridges, power plants, etc. A two-component, metallic zinc-containing primer. Although the low-molecular-weight reactive additives cure into the film under normal ambient conditions, EPA Method 24 analysis has found that they also affect the VOC value. Parameters on this page: dry film thickness 50–75 µm (2–3 mils), theoretical spreading rate 7.33 m²/L, components two-component.
Data source: AKZONOBEL original Technical Data Sheet (TDS), "Interzinc 42 Epoxy Zinc Powder Primer"; spreading rate and other values are converted from the TDS parameters, 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 | 55% |
|---|---|
| Dry Film Thickness | 50–75 µm (2–3 mils) |
| Theoretical Spreading Rate | 7.33 m²/L |
| VOC | 3.43 lb/gal (412 g/L) US EPA Method 24 226… |
| Density / Specific Gravity | 1.94 kg/L (16.2 lb/gal) |
| Number of Components | Two-component |
| Thinner | Normally no thinning is required |
| Mixing Ratio | 4 parts : 1 part (by volume) |
| Colour / Appearance | Red, grey, green, INTERZINC 42 |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
A two-component, metallic zinc-containing primer.
This zinc-containing primer can serve as part of a coating system to protect facilities in severely corrosive environments, widely applicable across many industries, such as offshore installations, petrochemical plants, pulp and paper mills, bridges, power plants, etc. Interzinc 42 can be used for maintenance work and also as a primer for new construction.
| Colour | Red, grey, green, INTERZINC 42 |
|---|---|
| Gloss | Matt |
| Volume Solids | 55% |
| Typical thickness | Dry film thickness 50–75 µm (2–3 mils), equivalent to wet film thickness 91–136 µm (3.6–5.4 mils) |
| Theoretical Spreading Rate | At 75 µm dry film thickness and the stated volume solids, 7.33 m²/L; at 3 mils dry film thickness and the stated volume solids, 294 sq ft/US gal |
| 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) | 90 min | 5 h | 4 h | Unlimited¹ |
| 15°C (59°F) | 60 min | 4 h | 3 h | Unlimited¹ |
| 25°C (77°F) | 45 min | 150 min | 2 h | Unlimited¹ |
| 40°C (104°F) | 30 min | 90 min | Unlimited¹ | |
¹ See the "Definitions and Abbreviations" of International Protective Coatings; for more details, see the "Product Characteristics" section
| Flash point (typical) | Component A 31 °C (88 °F); Component B 32 °C (90 °F); mixed 32 °C (90 °F) |
|---|---|
| Product weight | 1.94 kg/L (16.2 lb/gal) |
| Volatile Organic Compounds | 3.43 lb/gal (412 g/L) US EPA Method 24; 226 g/kg EU Solvent Emissions Directive content (EU Council Directive 2010/75/EU); 389 g/L China National Standard GB 23985; coating hazard GB 30981.2-S-Pb≤1000-NC, complies with GB 30981.2-2025. For more details, 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.
Blast-cleaned steel surfaces: blast clean to Sa 2½ (ISO 8501-1:2007) or SSPC-SP6. If oxidation occurs between blast cleaning and application of Interzinc 42, the surface shall be re-blasted to the specified visual standard.
Surface defects exposed by blast cleaning must be ground, filled or treated by a suitable method.
Recommended surface roughness 40–75 µm (1.5–3.0 mils).
Steel structures pre-primed with shop primer: Interzinc 42 is suitable for steel members freshly coated with zinc silicate shop primer.
If the zinc shop primer shows extensive large-scale breakdown or heavy zinc salts, full sweep blasting is required. Other types of shop primer are not suitable for recoating and must be removed completely by 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 parts : 1 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) |
| 24 h | 16 h | 10 h | 5 h |
| Suitable for airless spray | Recommended nozzle diameter 0.43–0.53 mm (17–21 mils); total paint pressure at the nozzle not less than 162 kg/cm² (2304 lb/in²) |
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| Air Spray | Recommended | 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 50 µm (2.0 mil) | |
| Roller application | Not recommended | ||
| Thinner | International GTA220 | Normally no thinning is required. |
In extreme cases, consult the local technical representative.
Do not thin beyond the requirements 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 interruptions, and other factors. |
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Surplus paint and empty containers must be disposed of in accordance with the relevant regional regulations.
To ensure good corrosion protection, the minimum dry film thickness of Interzinc 42 must reach 50 µm (2 mils). The film thickness of Interzinc 42 must match the surface roughness obtained during surface preparation. Rough surfaces should not be coated with thin films.
Care should be taken to avoid applying dry film thickness exceeding 150 µm (6 mils).
Avoid over-thick application; if the film is too thick, cracking may result from cohesive failure. Dry spray shall also be avoided, otherwise pinholes will appear.
Excessive application of Interzinc 42 prolongs the minimum overcoating and handling times, adversely affecting long-term overcoating performance.
When Interzinc 42 is allowed to weather before topcoat application, all zinc salts shall be removed before painting, and only recommended materials shall be used for the topcoat.
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).
It is recommended not to use Interzinc 42 underwater. Consult International Protective Coatings for details in this regard.
| In Australia, New Zealand and the South Pacific islands, a low-temperature hardener is available for low-temperature conditions. | For details, consult International Paint. |
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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.
Interzinc 42 is designed for application on suitably prepared steel, and can also be applied on approved pre-primed surfaces. Details in this regard are available from International Protective Coatings.
Recommended topcoats:
| Intercryl 530 | Intergard 740 |
|---|---|
| Intercure 200 | Interseal 670HS |
| Intercure 420 | Interthane 990 |
| Interfine 629HS | Interthane 990E |
| Intergard 251 | Interzone 505 |
| Intergard 269 | Interzone 954 |
| Intergard 475HS | Interzone 1000. For other suitable topcoats, consult International Paint Protective 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. |
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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 |
| 5 US gal | 4 US gal | 5 US gal | 1 US gal | |
For other packaging sizes, contact AkzoNobel.
| Packaging Specifications | Component A | Component B |
| 10 L | 19.6 kg | 2.1 kg |
| 5 US gal | 78.7 lb | 8.4 lb |
| 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. |
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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.
The factory product codes of Interzinc 42 Epoxy Zinc Powder Primer are as follows.Item No.is the most accurate form when ordering;Colour/colour codecorresponds to the actual colour (RAL, GSB are colour chart codes);Packaging SpecificationsFactory complete-set specification format. Colors not listed may be ordered against the colour card.
| Item No. | Colour / colour code | Packaging Specifications |
|---|---|---|
| EPA039 | Grey | 20 L |
This model has a total of1item numbers, all listed on this page; colours outside the table (including special colours and bulk packaging) can be confirmed by phone, delivery dates are advised according to the factory's current production schedule and stock. In the packaging specification, the "+" indicates the complete-set notation for two-component products (base + curing agent), subject to the factory specification; a "—" in the colour column denotes an auxiliary product, or that the item has no colour code in the factory system.
