Intergard 251HS Epoxy Zinc Phosphate Primer is an epoxy paint, used as a primer. Welds and damaged areas should be blast cleaned to Sa 2½ (ISO 8501-1:2007) or SSPC SP6. A two-component, low-VOC, high-solids, fast-drying epoxy zinc phosphate anti-corrosive primer and intermediate coat. As with all epoxy systems, the product may chalk and discolour under external exposure; when a durable decorative surface with good gloss and colour retention is required, a recommended topcoat should be applied. Parameters on this page: volume solids 75% ± 2%, dry film thickness 75–200 µm (3–8 mils), theoretical spreading rate 10 m²/L.
Data source: AKZONOBEL original Technical Data Sheet (TDS), "Intergard 251HS Epoxy Zinc Phosphate 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 | 75% ± 2% |
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| Dry Film Thickness | 75–200 µm (3–8 mil) |
| Theoretical Spreading Rate | 10 m²/L |
| VOC | 2.02 lb/gal (243 g/L) US EPA Method 24 15… |
| Density / Specific Gravity | 1.59 kg/L (13.3 lb/gal) |
| Number of Components | Two-component |
| Thinner | International GTA220. Do not exceed the thinning limits of local environmental regulations |
| Mixing Ratio | 3 parts : 1 part (by volume) |
| Colour / Appearance | Red, grey, pale yellow, INTERGARD 251HS |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
A two-component, low-VOC, high-solids, fast-drying epoxy zinc phosphate anti-corrosive primer and intermediate coat.
In general climatic conditions, overcoatable within 2 hours. Fast handling properties make it an ideal primer for accelerated production and productivity.
Can be used for film-forming and fast throughput as a priority in a range of industrial facilities and infrastructure.
Welds and damaged areas should be blast cleaned to Sa 2½ (ISO 8501-1:2007) or SSPC SP6. If this is impractical, SSPC SP11 is also acceptable.
| Colour | Red, grey, pale yellow, INTERGARD 251HS |
|---|---|
| Gloss | Matt |
| Volume Solids | 75% ± 2% |
| Typical thickness | Dry film thickness 75–200 µm (3–8 mils), equivalent to wet film thickness 100–267 µm (4–10.7 mils) |
| Theoretical Spreading Rate | At 75 µm dry film thickness and the stated volume solids, 10 m²/L; at 3 mil dry film thickness and the stated volume solids, 401 sq ft/US gal |
| Practical Spreading Rate | Allowing for a suitable loss factor |
| Application Methods | Suitable for airless spray, air spray, brush and roller. Drying time: recommended topcoat overcoating interval |
| Temperature | Surface Dry | Hard Dry | Minimum | Maximum |
| 5°C (41°F) | 2 h | 5.5 h | 4 h | Unlimited¹ |
| 15°C (59°F) | 60 min | 3.5 h | 3 h | Unlimited¹ |
| 25°C (77°F) | 30 min | 2.25 h | 2 h | Unlimited¹ |
| 40°C (104°F) | 15 min | 60 min | 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 31 °C (88 °F); Component B 30 °C (86 °F); mixed 31 °C (88 °F) |
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| Product weight | 1.59 kg/L (13.3 lb/gal) |
| Volatile Organic Compounds | 2.02 lb/gal (243 g/L) US EPA Method 24; 157 g/kg EU Solvent Emissions Directive content, Commission Directive 2010/75; 262 g/L Korean Clean Air Conservation Act. Coating hazardous substances: GB 30981.2-S-Pb≤1000-NC compliant with GB 30981.2-2025. For more details, see the "Product Characteristics" section. |
All steel surfaces to be coated must be clean, dry and free of contamination. Before application, all surfaces must be assessed and prepared in accordance with ISO 8504:2000.
Oil and grease must be removed by solvent cleaning in accordance with SSPC-SP1.
Steel: blast clean to at least Sa 2½ (ISO 8501-1:2007) or SSPC-SP6. If oxidation occurs between blast cleaning and application of Intergard 251HS, the surface shall be re-blasted to the specified visual standard. Surface defects exposed by the blast cleaning process should be ground, filled or treated by other suitable methods.
Recommended surface roughness 40–75 µm (1.5–3.0 mils).
Shop-primed steel structures: welds and damaged areas should be blast cleaned to Sa 2½ (ISO 8501-1:2007) or SSPC SP6. If this is impractical, SSPC SP11 is also acceptable.
| 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 | 3 parts : 1 part (by volume) |
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| Pot life | 5°C (41°F) | 15°C (59°F) | 25°C (77°F) | 40°C (104°F) |
| 90 min | 60 min | 30 min |
| 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 155 kg/cm² (2204 psi) |
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| Air Spray | Suitable | Spray gun | DeVilbiss MBC or JGA |
| Air nozzle | 704 or 765 | ||
| (with pressure pot) | Spray painting | E | |
| Brush | Suitable | Suitable for small areas and touch-up; multiple coats are required to achieve the dry film thickness |
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| Roller application | Suitable for small areas and touch-up; multiple coats are required to achieve the dry film thickness. |
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| Thinner | International GTA220. Do not exceed the thinning limits of local environmental regulations |
| Cleaner | Use a cleaning solvent that complies with local regulations. Consult the local representative for specific recommendations. |
| 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 | Clean all equipment immediately after use with International thinner. Flushing spray equipment periodically during application is recommended. Cleaning frequency depends on the volume sprayed, temperature and time, including all interruptions. |
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Surplus paint and empty containers must be disposed of in accordance with the relevant local regulations.
Intergard 251HS is suitable for use with some products in certain chemical environments, because in such chemical environments zinc-containing coatings are attacked by acids and alkalis.
Apply in good weather conditions. The surface to be coated must be at least 3 °C (5 °F) above the dew point. Excessive film thickness of Intergard 251HS will extend the minimum overcoating interval and handling time.
If Intergard 251HS is applied by brush or roller, multiple coats may be required to achieve the required film thickness.
As with all epoxy systems, the product may chalk and discolour under exterior exposure. Where a durable decorative finish with good gloss and colour retention is required, apply the recommended topcoat.
Intergard 251HS is not designed for continuous immersion in water.
In hot weather, another hardener is available to improve application conditions.
When using the summer hardener, the following drying times and overcoating intervals apply.
Overcoat with the recommended topcoat
| Temperature | Surface Dry | Hard Dry | Minimum | Maximum |
| 5°C (41°F) | 5 h | 16 h | Unlimited¹ | |
| 15°C (59°F) | 4 h | 6 h | Unlimited¹ | |
| 25°C (77°F) | 90 min | 4 h | Unlimited¹ | |
| 40°C (104°F) | 45 min | 2 h | Unlimited¹ | |
1 See International Paint's Protective Coatings division "Definitions and Abbreviations". Pot life:
| 5°C (41°F) | 15°C (59°F) | 25°C (77°F) | 40°C (104°F) |
| 2 h | 90 min | 60 minutes | |
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.
Intergard 251HS is normally applied directly to steel, but it can also be applied over the following primers:
| Interzinc 22 | Interzinc 52. Recommended topcoats: |
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| Chartek 1709 | Chartek 7 | Chartek 8E |
| Interchar 1190 | Interchar 212 | Interfine 878 |
| Interfine 979 | Intergard 345 | Intergard 475HS |
| Intergard 740 | Interseal 670HS | Interthane 870 |
| Interthane 870UHS* | Interthane 990 | Interthane 990E |
| Interthane 990V* | Interzone 954. For other suitable topcoats, consult International Paint Protective Coatings. *Only available in some countries |
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| 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 | |
| 20 L | 15 L | 20 L | 5 L | |
| 5 US gal | 3 US gal | 5 US gal | 1 US gal | |
| 1 US gal | 0.75 US gal | 1 US gal | 0.25 US gal | 1 US quart |
For other packaging sizes, contact AkzoNobel.
| Packaging Specifications | Component A | Component B |
| 20 L | 26.8 kg | 7.1 kg |
| 5 US gal | 54.1 lb | 13 lb |
| 1 US gal | 12 lb | 3.5 lb |
| Shelf life | 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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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.
The factory product codes for Intergard 251HS Epoxy Zinc Phosphate 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 |
|---|---|---|
| KGA800 | 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.
