Interzinc 315 Fast-overcoating Epoxy Zinc-rich Primer is a zinc-rich primer in the epoxy system. As a zinc-rich primer forming part of a coating system, it provides corrosion protection for steel substrates in various industrial environments, including offshore structures, petrochemical and chemical plants, refineries, paper mills and bridges. A two-component, high-solids, low-VOC epoxy zinc-rich primer formulated with proprietary polymer technology for fast curing and overcoating even at low temperature. Over-thick application also reduces curing speed and extends handling and recoat times. Parameters on this page: dry film thickness 50–75 µm (2–3 mil), theoretical spreading rate 13.80 m²/L, number of components two.
Source: AkzoNobel original technical data sheet (TDS) "Interzinc 315 Fast-overcoating Epoxy Zinc-rich 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 | 69% |
|---|---|
| Dry Film Thickness | 50–75 µm (2–3 mils) |
| Theoretical Spreading Rate | 13.80 m²/L |
| VOC | 2.79 lb/gal (335 g/L) US EPA Method 24 103… |
| Density / Specific Gravity | 3.16 kg/L (26.4 lb/gal) |
| Number of Components | Two-component |
| Thinner | Do not exceed the thinning limits of local environmental regulations |
| Mixing Ratio | 4 parts : 1 part (by volume) |
| Colour / Appearance | Blue, grey, INTERZINC 315 |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
A two-component, high-solids, low-VOC epoxy zinc-rich primer formulated with proprietary polymer technology for fast curing and overcoating even at low temperature.
Interzinc 315 uses zinc dust complying at least with ASTM D520 Type II.
As a zinc-rich primer forming part of a coating system, it provides corrosion protection for steel substrates in various industrial environments, including offshore structures, petrochemical and chemical plants, refineries, paper mills and bridges.
The fast curing and overcoating characteristics of Interzinc 315 provide production flexibility, making the product suitable for new structures and as an on-site maintenance coating.
| Colour | Blue, grey, INTERZINC 315 |
|---|---|
| Gloss | Matt |
| Volume Solids | 69% |
| Typical thickness | Dry film 50–75 µm (2–3 mil), equivalent to wet film 72–109 µm (2.9–4.4 mil) |
| Theoretical Spreading Rate | At 50 µm dry film thickness and the stated volume solids, 13.80 m²/L; at 2 mil dry film thickness and the stated volume solids, 553 ft²/US gal |
| Practical Spreading Rate | Allowing for a suitable loss factor |
| Application Methods | Airless spray, air spray, brush. Drying time; recommended topcoat recoat interval |
| Temperature | Surface Dry | Hard Dry | Minimum | Maximum |
| 5°C (41°F) | 30 min | 5 h | 4 h | Unlimited¹ |
| 15°C (59°F) | 20 min | 3 h | Unlimited¹ | |
| 25°C (77°F) | 15 min | 2 h | Unlimited¹ | |
| 40°C (104°F) | 10 min | 1 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 27 °C (81 °F); Component B 26 °C (79 °F); mixed 27 °C (81 °F) |
|---|---|
| Product weight | 3.16 kg/L (26.4 lb/gal) |
| Volatile Organic Compounds | 2.79 lb/gal (335 g/L) US EPA Method 24. 103 g/kg. EU Solvent Emissions Directive (EU Council Directive 2010/75/EU). Coating hazards: GB 30981.2-S-Pb≤1000-NC. Complies with GB 30981.2-2025. 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 8504:2019.
Oil and grease must be removed in accordance with the SSPC-SP1 solvent cleaning standard.
Blast cleaning: blast clean with steel grit to Sa 2½ (ISO 8501-1:2007) or SSPC-SP6. If oxidation occurs between blasting and application of Interzinc 315, 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 angular surface profile of 50–75 µm (2–3 mils).
Shop-primed steel: Interzinc 315 is suitable for application on steel structures freshly coated with zinc silicate shop primer.
If the shop primer was applied over a shot-blasted surface, full brush-off-grade blasting is required before applying Interzinc 315.
If the zinc dust shop primer shows large-area or widespread failure, or excessive zinc corrosion products, full brush-off-grade blasting is required. Other types of shop primer are not suitable for overcoating and must be completely removed by abrasive blasting.
Welds and damaged areas shall 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.
For the three-component coating, see the Product Characteristics section.
| 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) |
| 6 h | 3 h | 2 h | 1 h |
| Suitable for airless spray | Recommended nozzle tip size 0.43–0.53 mm (17–21 thou); total paint pressure at the nozzle not less than 141 kg/cm² (2005 psi) |
|---|---|
| Air Spray | Applicable – small-area repair only (with pressure pot) |
| Brush | Applicable — for small-area repair only | Typical thickness 40–50 µm (1.6–2.0 mils) |
| Roller application | Not recommended | |
| Thinner | International GTA220 | Do not exceed the thinning limits of local environmental regulations |
(or International GTA415)
| 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 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.
Due to the high solids and high zinc content of this coating, in some countries it must be supplied as a 3-container coating to meet local transport requirements. In terms of application and performance, the paint mixing and achieved dry film thickness are identical for the 2-container and 3-container coatings.
The following is information on how to mix the three-component coating: the coating is packed in three containers, supplied as one unit. Mix all in the supplied proportions when using. Once mixed, use within the specified pot life.
(1) Stir the base (component A) with a power stirrer, then mix all of the base (component A) and curing agent (component B) and stir thoroughly with a power stirrer.
(2) The powder component (component C) shall be slowly added to the well-mixed components A and B under power stirring. (3) Before application, the paint shall be strained; during spraying, stir the container frequently.
| Interzinc 315 may be applied at dry film thicknesses between 50 µm (2 mil) | and 150 µm (6 mil). Take care to avoid over-thick application; avoid film thicknesses exceeding 150 µm (6 mil). |
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Over-thick application shall be avoided, as it affects intercoat adhesion with the next coat; dry spray shall also be avoided to prevent pinholes in the next coat. Over-thick application also slows curing and extends handling and overcoating times.
This product must be thinned only with the recommended International thinner. Other thinners, especially those containing ketones, severely inhibit the curing of the coating.
It is recommended not to use Interzinc 315 underwater. Consult International Paint for details.
Low-temperature curing: Interzinc 315 cures below 0 °C (32 °F). However, the product should not be applied at 0 °C (32 °F), because there may be ice on the substrate.
For details of curing times and recoatability, contact International Paint.
The temperature of the surface to be coated must be at least 3 °C (5 °F) above the dew point.
This product holds the following specification certifications: • SSPC Paint System No. 20, Type II • BS 5493 (1977): DF and KP1B • BS 4652:1995 • ASTM A490 Class B slip coefficient. Note: VOC values are typical values for guidance only. The values may vary with factors such as colour difference and general production tolerances.
Interzinc 315 is designed for application on steel suitably blast cleaned with steel grit, but may be applied over approved pre-construction primers.
Recommended topcoats:
| Intercure 200 | Intergard 740 |
|---|---|
| Intercure 200HS | Interseal 670HS |
| Intercure 420 | Interthane 870 |
| Interfine 629HS | Interthane 990 |
| Interfine 979 | Interzone 505 |
| Intergard 475HS | Interzone 954. 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 | Component C | |||
| Volume | Packaging | Volume | Packaging | Volume | Packaging | |
| 10 L | 8 L | 10 L | 2 L | 2.5 L | - | |
| 4 US gal | 1.77 US gal | 5 US gal | 0.8 US gal | 1 US gal | 1.43 US gal | 3 US gal |
For other packaging sizes, contact AkzoNobel.
| Packaging Specifications | Component A | Component B | Component C |
| 10 L | 31.4 kg | 2.2 kg | 0 kg |
| 4 US gal | 24.2 lb | 5.5 lb | 88.4 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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All registered trademarks mentioned in this publication are licensed to or owned by AkzoNobel.
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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.
