Interplate 837HS Inorganic Zinc Silicate is an inorganic zinc silicate coating. A two-component ethyl silicate shop primer and anticorrosive primer, designed to provide good welding and cutting performance and good corrosion protection of damage caused by welding. A two-component heat-resistant ceramic zinc silicate anticorrosive primer. Interplate 837HS is specially designed to provide good corrosion and heat resistance, making it suitable for steel structures with thermal insulation, to minimise heat conduction in areas such as bulkheads, dry areas and void spaces. Parameters on this page: volume solids 45% ± 3%, dry film thickness 30–75 µm (1.2–3 mil), theoretical spreading rate 6 m²/L.
Source: AkzoNobel original technical data sheet (TDS) "Interplate 837HS Inorganic Zinc Silicate"; 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 | 45% ± 3% |
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| Dry Film Thickness | 30–75 µm (1.2–3 mil) |
| Theoretical Spreading Rate | 6 m²/L |
| VOC | 5.04 lb/gal (605 g/L) US EPA Method 24 61… |
| Density / Specific Gravity | 1.714 kg/L (14.3 lb/gal) |
| Number of Components | Two-component |
| Thinner | International GTA415 or GTA803 |
| Mixing Ratio | 10 parts : 9 parts by volume |
| Colour / Appearance | Grey, INTERPLATE 837HS |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
Two-component heat-resistant ceramic zinc silicate anticorrosive primer. Suitable for controlled cathodic protection.
A two-component ethyl silicate shop primer and anticorrosive primer, designed to provide good welding and cutting performance and good corrosion protection of damage caused by welding.
Suitable for newbuildings, as an anticorrosive primer for steel bulkheads, partitions and internal walls, which may be in contact with insulation, to reduce energy loss in accommodation areas, machinery spaces and similar areas.
| Colour | Grey, INTERPLATE 837HS |
|---|---|
| Gloss | N/A |
| Volume Solids | 45% ± 3% |
| Typical thickness | Dry film 30–75 µm (1.2–3 mil), equivalent to wet film 67–167 µm (2.7–6.7 mil) |
| Theoretical Spreading Rate | At 75 µm dry film thickness and the stated volume solids, 6 m²/L; at 3 mil dry film thickness and the stated volume solids, 241 ft²/US gal |
| Practical Spreading Rate | Allowing for a suitable loss factor |
| Application Methods | Suitable for airless spray, roller, air spray, brush and conventional spray. Drying time: recommended topcoat overcoating interval |
| Temperature | Surface Dry | Hard Dry | Minimum | Maximum |
| 5°C (41°F) | 40 min | 100 min | 72 h | Unlimited¹ |
| 15°C (59°F) | 30 min | 80 min | 48 h | Unlimited¹ |
| 25°C (77°F) | 20 min | 50 min | 32 h | Unlimited¹ |
| 40°C (104°F) | 10 min | 25 min | 16 h | Unlimited¹ |
¹ See the "Definitions and Abbreviations" of International Paint's Industrial Protective Coatings division. The drying times above were measured at the above temperature and 65% relative humidity. Verify a value of 3 by the ASTM D4752 MEK rub test before overcoating. For more details on the coating, see the "Product Characteristics" section.
| Flash point (typical) | Component A 32 °C (90 °F); Component B 22 °C (71 °F); mixed 23 °C (73 °F) |
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| Product weight | 1.714 kg/L (14.3 lb/gal) |
| Volatile Organic Compounds | 5.04 lb/gal (605 g/L) US EPA Method 24. 619 g/L, calculated value. For further 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 8504:2000.
Oil and grease must be removed in accordance with the SSPC-SP1 solvent cleaning standard.
Blast cleaning: abrasive blast clean to Sa 2½ (ISO 8501-1:2007) or SSPC-SP6 (blast to SSPC-SP10 for ideal performance). If oxidation occurs between blasting and application of Interplate 837HS, 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).
Shop-primed steel: Interplate 837HS is suitable for application on steel structures freshly coated with zinc silicate shop primer, blasted at least to near-white SSPC-SP10 or Sa 2½. For the reverse side of welds, such as the inside of insulated walls, prepare to the Swedish standard SIS 05 5900 or St2.
If the zinc silicate shop primer shows widespread scattered failure or produces excessive zinc salts, sweep blasting is required. Other types of shop primer are not suitable for overcoating and require thorough blasting;
Welds and damaged areas shall 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. |
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| Mixing | The material is supplied as a two-component kit. Always mix in the proportions provided. Once mixed, it must be used within the specified pot life. (1) Stir component A with an air-driven stirrer. (2) Mix all of component B with component A and stir thoroughly with an air-driven stirrer. |
|---|---|
| Mixing ratio | 10 parts : 9 parts by volume |
| Pot life | 5°C (41°F) | 15°C (59°F) | 25°C (77°F) | 40°C (104°F) |
| 18 h | 12 h | 8 h | 4 h |
| Suitable for airless spray | Recommended: nozzle diameter 0.38–0.53 mm (15–21 thousandths of an inch); total paint pressure at the nozzle not less than 112 kg/cm² (1593 psi) |
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| Air Spray | Recommended | Spray gun | DeVilbiss MBC or JGA |
| Air nozzle | 704 or 765 | ||
| (with pressure pot) | Spray painting | E | |
| Air spray (conventional) | Suitable | Use suitable dedicated equipment. | |
| Brush | For small areas only | Typical thickness 30–75 µm (1.2–3.0 mil) | |
| Roller application | For small areas only | Typical thickness 30–75 µm (1.2–3.0 mil) |
| Thinner | International GTA415 or GTA803 |
|---|---|
| Cleaner | International GTA415 or GTA803 |
| Interruption of work | Do not leave paint in hoses, spray guns or spray equipment. Flush all equipment thoroughly with International thinner. |
Once mixed, a batch of paint shall not be re-sealed; if work is interrupted for too long, remix a fresh batch 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. |
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All surplus paint and empty containers must be disposed of in accordance with the appropriate local laws/regulations.
Interplate 837HS is specially designed to provide good corrosion and heat resistance, making it suitable for steel structures with thermal insulation, to minimise heat conduction in areas such as bulkheads, dry areas and void spaces. This product should not be used under insulation in continuously wet and/or thermal-cycling conditions.
Before recoating, the product must be clean, dry and free of soluble salts and excessive zinc corrosion products.
The temperature of the surface to be coated must be at least 3 °C (5 °F) above the dew point.
When applying Interplate 837HS in confined spaces, ensure adequate ventilation.
The minimum overcoating interval depends on the relative humidity during curing.
If thinning is required to aid spraying in warmer climates (typically >28 °C (82 °F)), the use of International GTA415 thinner is recommended.
Before overcoating, a solvent rub test per ASTM D4752 is recommended. A test value of 3 indicates satisfactory cure for overcoating.
Below 55% relative humidity, curing will be severely retarded; measures such as steam or water misting are required to raise the humidity.
Excessive film thickness or over-application of Interplate 837HS causes mud cracking; once cracking occurs, the affected areas must be completely removed by blasting and re-coated per the original paint system.
Avoid applied film thicknesses exceeding 110 µm (4.3 mil) dry, otherwise optimal coating system performance cannot be achieved.
Un-topcoated Interplate 837HS is not suitable for exposure to acid/alkali environments or long-term immersion in water.
The product holds the following specification approvals:
| • Fire resistance – meets low flame spread requirements – IMO Resolution MSC 307(88): Annex 1: | Part 5. • Fire resistance – complies with the Marine Equipment Directive. Note: VOC values are typical values for guidance only. The values may vary with factors such as colour difference and general production tolerances. |
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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.
Before overcoating with the recommended topcoat, ensure Interplate 837HS is fully cured. If weathering has occurred, wash all zinc salts off with fresh water, brushing with a bristle brush if necessary.
Interplate 837HS is suitable for overcoating with: Intergard 269, Intergard 787, Intershield 300, Intershield 300HS. In some cases, a mist coat of suitable viscosity is required to reduce bubbling, depending on the ageing of Interplate 837HS, 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 primers/intermediate coats, 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 | ||
| Volume | Packaging | Volume | Packaging | |
| 15 L | 7.9 L | 20 L | 7.1 L | 10 L |
For other packaging sizes, contact AkzoNobel.
| Packaging Specifications | Component A | Component B |
| 15 L | 20 kg | 7.6 kg |
| Shelf life | 6 months at 25 °C (77 °F). Inspection required thereafter. Store in a dry, cool environment, away from heat sources 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.
