Interzinc 12 Zinc-pigmented Primer is a zinc-rich primer. Can be used with various high-performance coatings in offshore and onshore environments to protect oil platforms, refineries, bridges, tanks, pipes and steel structures. Complies with the composition and performance requirements of SSPC Paint 20. Excessive film thickness or over-application of Interzinc 12 causes mud cracking; once cracking occurs, the affected areas must be completely removed by blasting and re-coated per the original paint system. Parameters on this page: theoretical spreading rate 8.30 m²/L, number of components two.
Source: AkzoNobel original technical data sheet (TDS) "Interzinc 12 Zinc-pigmented Primer"; 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 | 62% |
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| Dry Film Thickness | — |
| Theoretical Spreading Rate | 8.30 m²/L |
| VOC | 3.76 lb/gal (451 g/L) US EPA Method 24 22… |
| Density / Specific Gravity | 2.40 kg/L (20.0 lb/gal) |
| Number of Components | Two-component |
| Thinner | Do not thin beyond the limits of local regulations |
| Mixing Ratio | 3.65 parts : 1.00 part by volume |
| Colour / Appearance | Green-grey, grey |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
A two-component solvent-borne inorganic primer. Complies with the composition and performance requirements of SSPC Paint 20.
As a zinc-pigmented primer, provides excellent corrosion protection for steel; can be used with various high-performance coatings in offshore and onshore environments to protect oil platforms, refineries, bridges, tanks, pipes and steel structures.
Particularly suitable for providing long-term protection of steel structures before on-site coating.
INTERZINC 12
| Colour | Green-grey, grey |
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| Gloss | Matt |
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| Volume Solids | 62% |
| Typical thickness | 50–75 µm (2–3 mil) dry film, equivalent to 81–121 µm (3.2–4.8 mil) wet film |
| Theoretical Spreading Rate | At 75 µm dry film thickness and the stated volume solids, 8.30 m²/L; at 3 mil dry film thickness and the stated volume solids, 331 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 |
| 5°C (41°F) | 40 min | 4 h | 36 h | Unlimited¹ |
| 15°C (59°F) | 20 min | 2 h | 24 h | Unlimited¹ |
| 25°C (77°F) | 15 min | 1 h | 16 h | Unlimited¹ |
| 40°C (104°F) | 5 min | 30 min | 8 h | Unlimited¹ |
¹ See the "Definitions and Abbreviations" of International Paint's Industrial Protective Coatings division. Recoat intervals depend on environmental conditions. The data in the table were measured at the listed dry film thickness, temperature and 65% relative humidity. For detailed recommendations, see "Product Characteristics".
| Flash Point | Component A 15 °C (59 °F); Component B N/A; mixed 16 °C (61 °F) |
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| Product weight | 2.40 kg/L (20.0 lb/gal) |
| Volatile Organic Compounds | 3.76 lb/gal (451 g/L) US EPA Method 24. 223 g/kg. EU Solvent Emissions Directive |
| Content | 1999 Commission Directive No. 13. For further details, see the "Product Characteristics" section. |
All surfaces to be coated shall be clean, dry and free from contaminants. Before coating, all surfaces shall be assessed and treated in accordance with ISO 8504:2000.
Oil and grease must be removed in accordance with the SSPC-SP1 solvent cleaning standard.
Blast cleaning: blast steel surfaces to Sa 2½ (ISO 8501-1:2007) or SSPC-SP6. If oxidation occurs between blasting and application of Interzinc 12, re-blast to the specified visual standard.
Surface defects exposed by the blasting process shall be ground, filled or treated in a suitable manner.
Recommended surface roughness 40–75 µm (1.5–3.0 mils).
Shop-primed steel: Interzinc 12 is suitable for steel members freshly coated with zinc silicate shop primer.
If the zinc dust shop primer has developed extensive large-area damage or large quantities of zinc salts, full sweep blasting is required. Other types of shop primer are not suitable for overcoating and must be completely removed by blasting.
Welds and damaged areas must be blast cleaned to Sa 2½ (ISO 8501-1:2007) or SSPC-SP6.
Damaged/repaired areas: all damaged areas should preferably be blast cleaned to Sa 2½ (ISO 8501-1:2007) or SSPC-SP6. However, power-tool cleaning of small areas to Pt3 (JSRA SPSS:1984) or SSPC-SP11 is permitted, provided the area is not polished. Then, the area may be repaired with the recommended epoxy zinc dust primer – consult International Paint for specific advice.
| Mixing | Interzinc 12 is supplied in two containers: a liquid base component (component A) and a zinc dust component (component B). Slowly add the zinc dust (component B) to the liquid base (component A) under mechanical stirring. Never add the liquid base to the zinc dust. Before application, the paint shall be strained; during spraying, keep stirring the paint in the container. Once mixed, the paint shall be used within the specified pot life. |
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| Mixing ratio | 3.65 parts : 1.00 part by volume |
| Pot life | 5°C (41°F) | 15°C (59°F) | 25°C (77°F) | 40°C (104°F) |
| 12 h | 8 h | 4 h | 2 h |
| Airless Spray | Recommended: nozzle diameter 0.38–0.53 mm (15–21 mil); total output fluid pressure at the nozzle not less than 112 kg/cm² (1593 psi). A 9 mm (0.375 in) fluid hose is recommended, maximum length 15 m (49 ft). |
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| Air spray (pressure pot) | Recommended | Spray gun | DeVilbiss MBC or JGA |
| Air nozzle | 704 or 765 | ||
| Nozzle | E | ||
| Brush | Suitable for small areas | Typical thickness 25–50 µm (1.0–2.0 mils) | |
| Roller application | Not recommended | ||
| Thinner | International GTA803 or | Do not thin beyond the limits of local regulations. |
International GTA415
| Cleaner | International GTA803 or International GTA415 |
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| Interruption of work | Do not allow coating to remain in hoses, spray guns or spray equipment. Flush all equipment thoroughly with International GTA 803. Once a kit of paint has been mixed, it should not be re-sealed; if the work interruption is too long, it is recommended to mix a fresh kit of paint. |
| Cleaning | All equipment should be cleaned immediately after use with International GTA 803. 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. |
All surplus paint and empty containers must be disposed of in accordance with the appropriate local laws/regulations.
Before overcoating, Interzinc 12 must be clean, dry and free of soluble salts and excessive zinc corrosion products.
The surface temperature must be at least 3 °C (5 °F) above the dew point.
When applying Interzinc 12 in confined spaces, ensure adequate ventilation.
The minimum recoat interval depends on the relative humidity during curing. Below 65% relative humidity, the recoat interval is normally at least 24 hours, but depends on the dry film thickness and the ambient temperature and relative humidity during application and curing.
Before recoating, perform a solvent rub test in accordance with ASTM D4752. A rating of 4 indicates satisfactory cure for recoating.
Below 50% relative humidity, curing is severely delayed, and steam or water spraying is needed to raise humidity. Alternatively, an Interzinc curing accelerator solution may be required. In this case, consult International Paint for more details.
If the product to be coated is used under high-temperature conditions, un-topcoated Interzinc 22 withstands a long-term dry temperature of 400 °C (752 °F); however, if this product is used as the primer for Intertherm 50, it withstands a dry temperature of 540 °C (1004 °F).
Excessive film thickness or over-application of Interzinc 12 causes mud cracking; once cracking occurs, the affected areas must be completely removed by blasting and re-coated per the original paint system.
Apply with care to avoid dry film thickness exceeding 125 µm (5 mils).
Un-topcoated Interzinc 12 is not suitable for exposure to acid/alkali environments or long-term immersion in water.
This product holds the following specification certifications: • SSPC Paint Specification 20 • ASTM A490 Class B slip coefficient. Note: VOC values are given based on the maximum possible value of this 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.
Where self-overcoating of Interzinc 12 is required due to low film thickness, the surface must be unweathered, freshly applied film.
The minimum dry film thickness of the subsequent coat over Interzinc 12 shall be 50 µm (2 mil) to ensure good film formation.
Before overcoating with the recommended topcoat, ensure Interzinc 12 is fully cured (see above). If weathering has occurred, wash all zinc salts off with fresh water, brushing with a bristle brush if necessary.
Suitable topcoats include:
| Intercryl 530 | Intergard 475HS |
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| Intercure 200 | Interseal 670HS |
| Intercure 420 | Intertherm 50 |
| Intergard 251 | Intertherm 715, Intergard 269: in some cases, a mist coat of suitable viscosity is required to reduce bubbling, depending on the ageing of Interzinc 12, surface roughness and the environmental conditions during curing and application. Epoxy sealers such as Intergard 269 can also be used to reduce bubbling. |
For other suitable topcoats/intermediate coats, consult International Paint.
| For further information on the industry standards, terms and abbreviations used in this datasheet, see www.international-pc.com | Available in the following documents on the website: • Definitions and Abbreviations • Surface Preparation • Coating Application • Theoretical and Practical Spreading Rates. Separate copies of 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 shall be carried out in accordance with the relevant national safety, health and environmental standards and regulations.
If welding or flame cutting is required on metal coated with this product, dust and fumes will be generated, requiring suitable personal protective equipment and adequate local exhaust ventilation.
If in doubt about the suitability of this product, consult International Paint.
| Packaging Specifications | Component A | Component B | ||
| Volume | Packaging | Volume | Packaging | |
| 15 L | 11.77 L | 15 L | 3.23 L | 20 L |
| 4.65 US gal | 3.65 US gal | 5 US gal | 1.01 US gal | 15 US gal |
For other available packaging sizes, contact International Paint.
| Packaging Specifications | Component A | Component B |
| 15 L | 13.5 kg | 24.8 kg |
| 4.65 US gal | 37.7 lb | 62.8 lb |
| Shelf life | Base: at least 6 months at 25 °C (77 °F). Powder: at least 12 months at 25 °C (77 °F). |
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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.
