Interzinc 388 Epoxy Zinc-rich Primer belongs to zinc-rich primers, epoxy coating systems. This is a high-performance primer that, as part of an anticorrosive coating system, provides ideal protection in a wide range of severe corrosive environments, including: offshore structures, petrochemical plants, paper mills, bridges and power plants. A two-component epoxy zinc-rich primer conforming to Chinese chemical industry standard HG/T 3668. Where Interzinc 388 is permitted to weather before topcoating, ensure all zinc salts are removed before painting, and apply the topcoat using only recommended materials. Parameters on this page: dry film thickness 50–75 µm (2–3 mil), theoretical spreading rate 7.87 m²/L, number of components two-component.
Parameter source: AKZONOBEL manufacturer's Technical Data Sheet (TDS) "Interzinc 388 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 | 59% |
|---|---|
| Dry Film Thickness | 50–75 µm (2–3 mils) |
| Theoretical Spreading Rate | 7.87 m²/L |
| VOC | 384 g/L (3.20 lb/gal) (calculated) 301 g/L China… |
| Density / Specific Gravity | 2.38 kg/L (19.9 lb/gal) |
| Number of Components | Two-component |
| Thinner | Normally no thinning is required |
| Mixing Ratio | 4 parts : 1 part (by volume) |
| Colour / Appearance | Grey, INTERZINC 388 |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
A two-component epoxy zinc-rich primer complying with the Chinese chemical industry standard HG/T 3668.
This is a high-performance primer that, as part of an anticorrosive coating system, provides protection in various severely corrosive environments, including offshore structures, petrochemical plants, paper mills, bridges and power plants.
Interzinc 388 can be used for maintenance of existing metal structures and also gives new structures excellent corrosion protection.
| Colour | Grey, INTERZINC 388 |
|---|---|
| Gloss | Matt |
| Volume Solids | 59% |
| Typical thickness | DFT 50–75 µm (2–3 mil) corresponds to WFT 85–127 µm (3.4–5.1 mil) |
| Theoretical Spreading Rate | 7.87 m²/L at 75 µm dry film thickness and the stated volume solids; 315 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. Drying time; recommended topcoat recoat interval |
| Temperature | Surface Dry | Hard Dry | Minimum | Maximum |
| 5°C (41°F) | 2 h | 10 h | 8 h | Unlimited¹ |
| 15°C (59°F) | 90 min | 6 h | 4 h | Unlimited¹ |
| 25°C (77°F) | 75 min | 4 h | 3 h | Unlimited¹ |
| 40°C (104°F) | 45 min | 2 h | Unlimited¹ | |
¹ See Definitions and Abbreviations from the International Paint Protective Coatings division. When polysiloxane topcoats are used, the maximum recoat interval is reduced. For details, consult International Paint.
| Flash point (typical) | Component A 29 °C (84 °F); Component B 30 °C (86 °F); mixed 29 °C (84 °F) |
|---|---|
| Product weight | 2.38 kg/L (19.9 lb/gal) |
| Volatile Organic Compounds | 384 g/L (3.20 lb/gal) (calculated) 301 g/L China national standard GB 23985 Coating hazard GB 30981.2-S-Pb≤1000-NC Conforms to GB 30981.2-2025 For more detailed information, see the section on "Product Characteristics" |
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 cleaning to Sa2½ (ISO 8501-1:2007) or SSPC-SP10. If oxidation occurs between blast cleaning and application of Interzinc 388, the surface shall be re-blasted to the specified visual standard.
Surface defects exposed during abrasive blasting 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 388 is suitable for steel components 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) |
|---|
| Pot life | 5°C (41°F) | 15°C (59°F) | 25°C (77°F) | 40°C (104°F) |
| 24 h | 12 h | 5 h | 2 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 | 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 50–75 µm (2.0–3.0 mils) | |
| Roller application | Not recommended | ||
| Thinner | International GTA220 | Normally no thinning is required. |
(or International. In extreme cases, consult the local technical representative.
GTA415). Do not thin beyond the requirements of local environmental regulations.
| Cleaner | International GTA822 (or International GTA415) |
|---|---|
| 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 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. |
Surplus paint and empty containers must be disposed of in accordance with the relevant regional regulations.
To ensure good corrosion resistance, Interzinc 388 must achieve a minimum dry film thickness of 40 µm (1.5 mil). To obtain a uniform, cohesive and sealed film at this dry film thickness, Interzinc 388 must be thinned 10% with International thinner. The film thickness of Interzinc 388 applied must match the surface profile achieved by surface preparation. Low film thickness shall not be applied to surfaces with a heavy profile.
Care shall be taken to avoid applying a dry film thickness above 150 µm (6 mil). 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.
Over-application of Interzinc 388 extends the minimum recoat time and handling time and adversely affects long-term recoat performance.
Where Interzinc 388 is permitted to weather before topcoating, ensure all zinc salts are removed before painting, and apply the topcoat using only recommended materials.
The temperature of the surface to be coated must be at least 3 °C (5 °F) above the dew point.
Interzinc 388 is not recommended for underwater use. Consult International Paint for details.
Interzinc 388 is suitable for local repair of damaged inorganic zinc primer - consult International Paint for specific recommendations.
Note: VOC values are typical and for guidance only. They may vary with colour and general production tolerances.
Interzinc 388 is designed for application to suitably prepared steel and may also be applied to approved pre-primed surfaces. Details on these aspects are available from International Paint.
Recommended topcoats:
| Intercryl 530 | Intergard 740 |
|---|---|
| Intercure 200 | InterH2O 401 |
| Intercure 420 | Interseal 670HS |
| Interfine 629HS | Interthane 990 |
| Intergard 251 | Interzone 1000 |
| Intergard 269 | Interzone 505 |
| Intergard 475HS | Interzone 954. 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 | 5 L |
For other packaging sizes, contact AkzoNobel.
| Packaging Specifications | Component A | Component B |
| 10 L | 22.5 kg | 2.2 kg |
| 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.
