Arcshield HT 480 Inert Multipolymeric Coating for CUI Service
An inert multipolymeric matrix coating for insulated and cyclic hot service, where corrosion under insulation is the failure mechanism. It is formulated for wet and dry cycling across a wide temperature range and can be applied to steel that is already in service and hot.
Grade Arcshield HT 480 | Range Protective and Marine Coatings | Technology Inert multipolymeric matrix coating
Technical Data Sheet
Arcshield HT 480
Issue 2026.09
1. Product description
An inert multipolymeric matrix coating for insulated and cyclic hot service, where corrosion under insulation is the actual failure mechanism. Water held against the wall by wet insulation during shutdowns, intermittent operation and cycling through the dew point attacks steel that a dry-service silicone would never be asked to resist, so this grade is formulated for wet and dry cycling across a wide temperature range rather than for steady dry heat. It can be applied to steel that is already in service and hot, which removes the shutdown that a conventional coating would require, and it is used on insulated pipework, vessels, reactor skirts and sub-zero to hot transitions within the stated service range.
2. Features
- Dry heat service typically from minus 45 °C to 650 °C, with wet and dry cycling duty qualified for the CUI class confirmed against the enquiry
- For carbon steel and austenitic stainless steel under insulation
- Applied to cold or hot steel within the stated application temperature range, avoiding a shutdown
- Applied direct to blast-cleaned steel without a separate primer in most schemes
- Qualification assessed against the CUI classes of ISO 19277
3. Recommended uses
Insulated pipework, vessels, reactor skirts and sub-zero to hot transitions, including austenitic stainless steel under insulation where chloride stress corrosion cracking is the concern.
Substrates. Abrasive blast cleaned carbon steel and austenitic stainless steel, including stainless under insulation where chloride stress corrosion cracking is the concern. Applied over blast-cleaned steel with no separate primer in most schemes, and over prepared aged coating only after adhesion testing.
4. Typical properties
| Property | Typical value | Method |
|---|---|---|
| Technology | Inert multipolymeric matrix coating | Formulation |
| Service temperature | Typically minus 45 °C to 650 °C in dry heat; wet and dry cycling duty within this range is qualified for the CUI class confirmed against the enquiry | ASTM D2485 for dry heat; cycling assessed to ISO 19277 |
| Corrosion under insulation qualification | Assessed against classes CUI-1 to CUI-3 according to the service temperature range and cycling regime; the class qualified for the product supplied is confirmed against the enquiry | ISO 19277 |
| Volume solids | Typically 50 to 65 per cent | ISO 3233-1 |
| Dry film thickness per coat | Typically 100 to 150 µm, one or two coats | ISO 2808 |
| Pull-off adhesion | Typically 3 to 8 MPa on blast-cleaned steel | ISO 4624, ASTM D4541 |
| Continuity | Low-voltage wet sponge for films up to 500 µm, where the specification calls for it | ASTM D5162 |
| Application temperature | Cold or hot steel within the stated application temperature range for the grade | Customer or supplier protocol |
Typical values, not a specification. Values for each batch are given on its Certificate of Analysis.
5. Application
| Parameter | Guidance |
|---|---|
| Method | Airless spray in one or two coats; brush and roller for detail. |
| Surface preparation | Carbon steel abrasive blast cleaned to Sa 2½ or better (ISO 8501-1); austenitic stainless steel blast cleaned with a non-metallic, iron-free and chloride-free abrasive. Profile typically 50 to 75 µm Rz (ISO 8503-2, ASTM D4417), and soluble salts to the limit set in the specification (ISO 8502-6 with ISO 8502-9). |
| Primer | None in most schemes; applied direct to blast-cleaned steel. Over prepared aged coating only after adhesion testing. |
| Applied film thickness | Typically 100 to 150 µm dry per coat, verified to ISO 2808, with holiday detection where the specification calls for it. |
| Steel temperature | Cold or hot steel within the stated application temperature range, allowing application to plant in service. |
| Next step | Insulation reinstated once the coating has dried to the state stated on the product data. |
Process. Airless spray in one or two coats, brush and roller for detail, applied to cold or hot steel within the stated application temperature range. Thickness is verified to ISO 2808 and holiday detection is used where the specification calls for it. Qualification for this duty is assessed against the CUI classes in ISO 19277.
6. Storage and handling
Store in the original closed containers in a dry, covered store, typically between 5 and 35 °C and out of direct sunlight. Shelf life is stated on the label and the Certificate of Analysis. Handle and use the product in line with its Safety Data Sheet.
7. Safety and regulatory information
Read the Safety Data Sheet before use. Safety Data Sheets and regulatory declarations are issued by our technical centre against the product and batch supplied, so they are sent on request rather than published. Request a Safety Data Sheet or declaration.
This Technical Data Sheet is published for on-screen reference. The information is given in good faith from laboratory and application experience and describes typical values; it is not a specification and does not replace a trial on your own substrate and line. Arctic Materials may revise this sheet without notice. Issue 2026.09.
Technical Data Sheets on this site are for on-screen viewing. For a controlled copy, write to tech@arcticmaterials.com.
Other grades in this range
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