Interseal 121 (flash rust and coating overspray) is a waterborne coating. The dual protection and unique peelability of Interseal 121 make it particularly suitable for temporary protection of coated substrates, preventing accidental contamination or damage, for example during transport or construction. Interseal 121 uses patented technology to ensure fast, complete peeling from the substrate over a wide temperature range without damaging the underlying coating or substrate. Any masking tape used to protect adjacent areas should be removed while Interseal 121 is still wet. Parameters on this page: dry film thickness 125–250 µm (5–10 mil), theoretical spreading rate 2.50 m²/L, number of components one.
Source: AkzoNobel original technical data sheet (TDS) "Interseal 121"; 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 | 50% |
|---|---|
| Dry Film Thickness | 125–250 µm (5–10 mil) |
| Theoretical Spreading Rate | 2.50 m²/L |
| VOC | 0.50 lb/gal (60 g/L) US EPA Method 24 50 … |
| Density / Specific Gravity | 1.10 kg/L (9.2 lb/gal) |
| Number of Components | One-component |
| Flash Point | >101°C (214°F) |
| Thinner | Do not thin |
| Mixing Ratio | N/A |
For more Q&A on selection, application, acceptance and defect diagnosis, seeFAQsection.
A one-component, spray-applicable, high-film-build waterborne coating. Can be applied directly over coated substrates or non-ferrous metal substrates. When dry, Interseal 121 forms a non-tacky, tough, elastic temporary protective coating.
Interseal 121 uses patented technology to ensure fast, complete peeling from the substrate over a wide temperature range without damaging the underlying coating or substrate.
Interseal 121 is designed to provide short-term protection against a range of contaminants, such as dust, grease, grinding residue, flash rust and overspray from coating application, while providing a degree of abrasion and scratch resistance.
The dual protection and unique peelability of Interseal 121 make it particularly suitable for temporary protection of coated substrates, preventing accidental contamination or damage, for example during transport or construction.
Interseal 121 provides significant short-term and long-term reductions in coating maintenance costs, while improving construction and installation productivity.
| Colour | Blue, white. INTERSEAL 121 |
|---|---|
| Gloss | |
| Volume Solids | 50% |
| Typical thickness | Dry film 125–250 µm (5–10 mil), equivalent to wet film 250–500 µm (10–20 mil) |
| Theoretical Spreading Rate | At 200 µm dry film thickness and the stated volume solids, 2.50 m²/L; at 8 mil dry film thickness and the stated volume solids, 100 ft²/US gal |
| 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 | Stripping time | Minimum | Maximum |
| 5°C (41°F) | 30 min | 1 h¹ | 30 min | Unlimited² |
| 15°C (59°F) | 30 min | 1 h¹ | 30 min | Unlimited² |
| 25°C (77°F) | 20 min | 1 h¹ | 20 min | Unlimited² |
| 40°C (104°F) | 25 min | 1 h¹ | 25 min | Unlimited² |
¹ The stripping time at the corresponding temperature refers to the minimum time during which the entire film of Interseal 121 has reached sufficient strength to permit stripping. Beyond this time, the film strength increases further, further improving the stripping efficiency.
² See the Definitions and Abbreviations of the International Paint Protective Coatings Division.
| Flash point (typical) | >101°C (214°F) |
|---|---|
| Product weight | 1.10 kg/L (9.2 lb/gal) |
| Volatile Organic Compounds | 0.50 lb/gal (60 g/L) US EPA Method 24. 50 g/kg. EU Solvent Emissions Directive, 1999 Commission Directive No. 13. For further details, see the "Product Characteristics" section. |
It is strongly recommended to carry out small-scale trials on a representative small area before full application, to ensure Interseal 121 is compatible with the underlying substrate in terms of peelability, service compatibility and the required temporary protection.
Interseal 121 is suitable for direct application over a range of approved painted and non-ferrous metal substrates. It is important that the coating material is sufficiently cured (dried) to ensure film properties such as gloss and colour, especially for durable topcoats, which should not be affected by the application of Interseal 121.
All surfaces to be coated must be clean, dry and free of contaminants.
The temperature of the surface to be coated must be at least 3 °C (5 °F) above the dew point.
Use masking to protect adjacent areas from overspray. Areas that cannot be masked, such as deep seams and channels, form a mechanical key to which the coating adheres.
Masking tape "pull tabs" may be applied directly to the underlying substrate to facilitate removal of Interseal 121.
| Mixing | This coating is single-component and shall be stirred thoroughly with a power stirrer before application. |
|---|---|
| Mixing ratio | N/A |
| 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 105 kg/cm² (1493 psi) |
Recommended
| Air Spray | Spray gun | DeVilbiss MBC or JGA |
| (with pressure pot) | Air nozzle | 704 or 765 |
| Nozzle | E |
| Brush | Recommended – small areas only. Typical thickness 75 µm (3.0 mil) |
|---|---|
| Roller application | Not recommended |
| Thinner | Do not thin |
| Cleaner | International GTA853 |
| Interruption of work | Flush all equipment thoroughly with clean water, then with International GTA853. All unused material shall be stored in closed containers. After a period of storage, skinning may occur in partly filled containers and the viscosity may rise. Strain before use. |
| Cleaning | Clean all equipment with GTA853 immediately after use. Periodically flushing spray equipment during the daily work is good practice. The frequency of cleaning depends on the quantity sprayed, temperature and elapsed time, including delays. |
All surplus paint and empty containers must be disposed of in accordance with the appropriate local regulations/laws.
| Removal | After removal, Interseal 121 can easily be kneaded into a lump by hand, effectively reducing waste volume before disposal. Disposal of Interseal 121 shall follow local laws and regulations. |
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A single-coat system of Interseal 121 is the typical practice for this product; however, multiple coats may also be applied to provide better protection against mechanical damage.
For specific advice, consult International Paint.
The peelability of Interseal 121 depends on temperature. For this reason, Interseal 121 is available in two products: the white product peels at ambient temperature, and the blue product peels at low temperature.
When removing Interseal 121, it is important to determine the expected typical ambient temperature to ensure the most effective peel grade is selected. Summarised as follows:
| Peel grade/colour | Applicable temperature range |
|---|---|
| Standard (white) | 10 °C (50 °F) to 40 °C (104 °F) |
| Low temperature (blue) | −29 °C (−20 °F) to 15 °C (60 °F) (this grade refers to peelability, not drying speed). Using either grade outside the listed temperatures may reduce peeling efficiency. |
As with all water-borne coatings, application conditions must be carefully controlled to ensure good performance.
The following basic requirements must be followed: Interseal 121 must avoid freezing at all times during storage. Recommended storage at 25 °C (77 °F).
During application, the steel surface temperature must not be below 10 °C, and must be at least 3 °C above the dew point.
Application at relative humidity above 70% extends the peel and overcoat times.
Good air flow around the workpiece is essential [minimum air velocity 0.1 m/s (4 in/s), maximum 0.5 m/s (20 in/s)].
For optimal protection and peeling performance, apply a continuous single film at 250–500 µm (10–20 mil) wet film thickness.
Overspray cannot be peeled off. If overspray occurs, remove it as soon as possible with a wet cloth or sponge. Dry overspray can be removed with alcohol.
Any masking tape used to protect adjacent areas should be removed while Interseal 121 is still wet.
When Interseal 121 is pressed against itself or another surface, a degree of adhesion (or tackiness) may occur. This should be considered when stacking coated samples.
To remove Interseal 121, lift an edge and peel. Alternatively, lift the masking tape "pull tab" previously attached to the underlying substrate.
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.
Interseal 121 may be applied directly to stainless steel and other non-ferrous substrates. For more details, contact International Paint.
Interseal 121 may be applied directly over the following approved products:
| Interfine 629HS | Interfine 878 |
|---|---|
| Interfine 979 | Interseal 670HS |
| Interthane 990 | Intertherm 228 |
| Interzone 505 | Interzone 954. For other compatible products, consult International Paint. |
Interseal 121 may only be self-overcoated at any time.
| 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. Application guide documents for 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 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, consult International Paint.
| Packaging Specifications | ||
| Volume | Packaging | |
| 5 US gal | 5 US gal |
For other available packaging sizes, contact International Paint.
Packaging Specifications
| 5 US gal | 46.3 lb. U.N. shipping number: non-hazardous |
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| Shelf life | At least 12 months at 25 °C (77 °F). Inspection required thereafter. Store in a dry, cool environment, away from heat sources and sources of ignition. Avoid freezing at all times during storage. |
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The information given in this product data sheet is not exhaustive. Anyone who uses, for any purpose, any product other than those specifically recommended in this data sheet without first obtaining our written confirmation does so at their own risk as regards the suitability of the product for the intended purpose. Although to the best of our knowledge all advice or statements given about the product (whether in this data sheet or otherwise) are correct, we cannot control the quality or condition of the substrate, nor the many factors affecting the use and application of the product. Accordingly, unless we specifically agree otherwise in writing, we accept no liability, to the maximum extent permitted by law, for any product performance problem arising, or for any loss or damage caused by use of the product. We hereby disclaim any warranty or representation, express or implied, arising by operation of law or otherwise, including but not limited to any implied warranty of merchantability or fitness for a particular purpose. All products supplied and all technical guidance provided are subject to our standard terms and conditions of sale. You should obtain a copy of this document and read it carefully. The information contained in this product data sheet may be amended at any time in the light of experience and of our product development policy. Before using the product, it is the customer's responsibility to check with the local representative that the data sheet in their possession is the latest version.
This product data sheet is available on www.international-marine.com or www.international-pc.com and should be identical to this copy. If the version on the website differs from this one, the version on the website shall prevail.
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Packaging specifications and batch lead times are subject to actual availability. PleaseContact Uscontact us for project-based calculation.
