Overview
High-temperature silicone coatings are built on a polydimethyl-siloxane backbone. The silicon-oxygen bond is exceptionally stable, which allows these coatings to survive continuous service at temperatures where organic coatings fail, including environments of 600 °C, 700 °C, 800 °C, 900 °C and even 1,000 °C.
Within the range you will find three product types. The air-drying finishes are single-component and cure at ambient temperature, which makes them the practical choice for maintenance and touch-up work. The heat-resistant primers are designed to protect steel substrate until the topcoat can be applied. The high-temperature aluminium finishes combine silicone chemistry with aluminium flake for maximum thermal radiation resistance.
Every silicone product in the Delshine range is supplied in temperature-specific grades rather than a single formulation, because the properties of the binder change dramatically across that range. Specifying the correct temperature grade is not optional — a 600 °C grade used at 800 °C will fail.
Silicone Air-Drying Finish (Black): 200°C
Product identification
The identifiers below are the ones printed on the drum and quoted on the purchase order. Always order and dispatch by code, because the grade and the zinc or temperature variant cannot be inferred from the trade name alone.
| Product code | DS200°C |
|---|---|
| Trade name | Silicone Air-Drying Finish (Black) |
| Category | High-temperature silicone coatings |
| System role | Topcoat - exposed finish of the system |
| Manufacturer description | 200°C |
Where this product is used
- Chimneys, exhaust stacks, flue pipes and industrial chimneys
- Furnaces, ovens, kiln linings and burner housings
- Engine exhaust manifolds, turbo housings and pipework
- Heat exchanger casings and boiler shells
- Industrial ovens, incubators and process heaters
- Automotive and aerospace exhaust components
- Fireplace and stove components
- Steel chimneys, flue liners and smoke stacks
How it works in the coating system
The topcoat is the visible, exposed layer of the system. It provides the colour, the gloss and the final resistance to weathering, UV, chemicals and mechanical wear — the properties the specifier and the owner actually see and rely on.
Because it is the only coat fully exposed to the service environment, the choice of topcoat chemistry is the single decision that most affects how a coating system ages. A system that is under-specified at the topcoat will look good on day one and disappoint in five years.
Purpose in the system: The final coat of the system, applied over the intermediate coat.
Technical properties
The values below are the typical published range for this product family. The exact figures for your batch are confirmed on the batch certificate and the current technical data sheet.
| Role in the coating system | Heat-resistant silicone coating — primer or finish for high-temperature steel |
|---|---|
| Volume solids | 45–60 % |
| Mixing ratio by volume | Single component, ready to use |
| Typical dry film thickness | 20–40 µm per coat |
| Theoretical coverage | 10–16 m²/litre per coat |
| Application methods | Conventional spray · brush · roller |
| Application temperature window | 5–40 °C application; continuous service temperature as specified |
| Suitable substrates | Prepared carbon steel, stainless steel and cast iron |
| Finish / appearance | Matt or satin; aluminium, black, grey, green and iron red |
| Principal resistance | Continuous heat, oxidation, weathering, thermal cycling |
| UV resistance | Excellent — no chalking or colour shift at temperature |
| Adhesion to prepared steel | > 3 MPa pull-off on prepared steel |
| Salt spray performance | > 1,000 h |
| Chemical resistance | Resistant to oils, fuels and most solvents; not to strong acids |
| Abrasion resistance | Low — handle the surface only after curing |
| Flash point | 5–20 °C |
| Shelf life | 18–24 months unopened |
| Density | 1.05–1.30 g/cm³ |
| Pack sizes | 1 kg–20 kg kits |
Surface preparation
- Remove all rust, scale, mill scale and old coating with abrasive blasting or mechanical preparation to a clean, bright surface.
- Degrease thoroughly with a suitable solvent cleaner and wipe with a clean lint-free cloth immediately before coating.
- Abrade to a uniform matte finish; silicone coatings adhere mechanically and a polished or contaminated surface will fail.
- Round all edges and grind welds smooth — heat cycles concentrate stress at sharp edges.
- Ensure the surface is completely dry and free of soluble salts before coating.
- Apply the heat-resistant primer first where a primer grade is specified. Steel should never be taken directly to a high temperature without a primer.
Application procedure
Apply by spray for the best appearance and film uniformity, by roller for large flat areas, or by brush where access is restricted.
Aim for a consistent wet film across the whole area. Overlapping passes should be kept wet to avoid a lap line in the finish.
Plan the work so that the coating is applied in manufacturable quantities — a full kit should be mixed and used within the pot life, and any surplus should be discarded rather than saved.
Mixing, ratio and induction time
Two-pack finishes are mixed at the ratio stated on the data sheet, commonly 4:1 or 5:1 by volume for epoxy and 3:1 for polyaspartic and acrylic polyurethane. Use a proper mixing gauge — a mix that is even a few percent off ratio will cure differently and may not meet the published properties.
Cure, recoat window and service readiness
Surface dry in 2 to 6 hours, recoatable in 12 to 24 hours, and fully cured in 7 days. Do not place the structure into service, immersion or heavy loading before full cure, even though the surface will feel dry much earlier.
Coverage and thickness calculation
Typical dry film thickness is 60-100 µm for a conventional finish and 40-60 µm for a high-build polyurethane finish. At 80 µm, one litre covers roughly 8-10 m². Two coats are usually specified where colour, gloss uniformity or coverage hiding matter.
Technical note. Coverage (m²/litre) = (volume solids × 10) / DFT (µm)
Worked example
| Specified DFT | 30 µm |
|---|---|
| Volume solids | 50 % |
| Theoretical coverage | 16.67 m²/litre |
| Total for the area | 100 m² → 1666.7 litres |
Advantages
- Continuous service temperatures from 200 °C up to 1,000 °C across the range, in graded formulations.
- Excellent thermal shock and cycling resistance — the coating survives rapid heating and cooling without cracking.
- Outstanding UV and weather resistance with no chalking, so outdoor stacks and exhausts stay serviceable.
- Good adhesion to steel at temperature with low blistering tendency.
- The aluminium flake grades reflect thermal radiation, reducing heat loss and substrate temperature.
- Single-component air-drying finishes allow maintenance and touch-up without specialist hot equipment.
Limitations and precautions
- Every product has a hard temperature ceiling. Exceeding it causes rapid oxidation, chalking and loss of adhesion.
- Silicone coatings are relatively soft compared with ceramic coatings and can be scratched mechanically.
- Colour and gloss are limited compared with decorative coatings — aluminium, black, grey, iron red and a small number of other colours are available.
- Not suitable for immersion or for chemical exposure beyond modest solvent resistance.
- Surface preparation is critical; any residual rust will cause blistering once the substrate heats up.
Storage and shelf life
- Store in the original sealed containers in a cool, dry, ventilated place between 5 °C and 30 °C.
- Do not store above 40 °C or in direct sunlight. Do not allow the material to freeze.
- Keep containers tightly closed — the binder is moisture sensitive.
- Rotate stock first-in-first-out and observe the labelled shelf life.
Safety, PPE and ventilation
- Silicone coatings are solvent-borne in most grades. Work in adequate ventilation and use an organic-vapour cartridge respirator.
- Wear chemical-resistant gloves, goggles and protective clothing.
- Remove all ignition sources. Solvent vapour is flammable and the coating will be applied near hot surfaces.
- Never coat a surface that is still hot or that will be heated before the coating has fully cured.
- Wear a respirator and protective clothing when removing old coatings from heated equipment.
Quality control and inspection
- Check colour and gloss against the approved sample or RAL reference before starting the full area.
- Measure DFT and check for thin spots, particularly over welds, edges and connections.
- Inspect the finished surface for lap marks, sag, orange peel, dust inclusion and solvent entrapment before accepting the coat.
Pricing and how to order
Delshine quotes this product per square metre at a specified dry film thickness, or per drum/litre depending on the project. The material cost is usually the smallest part of the installed cost — surface preparation, access and application labour dominate. Send us the substrate, the service conditions and the required DFT and our technical team will return a full system recommendation with a firm price.
High-temperature silicone coatings are priced per square metre at a stated dry film thickness. The temperature grade drives the price: a 600 °C aluminium finish costs several times a 300 °C grade because of the more expensive binder chemistry. Always price the complete system including primer and the preparation, since high-temperature surfaces need more preparation than any other work on the site.
Frequently asked questions
The questions below are the ones our technical team is asked most often about this product family.
What is the highest temperature silicone paint available?
The Delshine silicone range covers 200 °C, 300 °C, 400 °C, 500 °C, 600 °C, 700 °C, 800 °C, 900 °C and 1,000 °C, each with its own primer and air-drying finish grades. The 1,000 °C grades are supplied in aluminium, black and brown. Specify the grade that matches the actual metal temperature, not the exhaust air temperature.
Can silicone paint be used on a BBQ or exhaust pipe?
Yes, provided the correct temperature grade is chosen and the system includes the heat-resistant primer. For a domestic BBQ at 250-300 °C, the 300 °C primer and 300 °C air-drying finish are appropriate. Always confirm the actual metal temperature, not the flame temperature.
Do I need a primer for silicone coating?
Yes, on steel. The heat-resistant primer grades exist to protect the substrate from oxidation during service and to anchor the topcoat. Skipping the primer on steel risks the coating blistering and the steel corroding under it once the surface starts to heat up.
How long does a high-temperature coating last?
In continuous service at or below the rated temperature, a properly prepared two-coat silicone system typically gives 3-8 years, and considerably longer in cooler service. Cycles above the rating, thermal shock and mechanical damage all shorten life. Aluminium flake grades generally outlast the standard finishes in oxidising atmospheres.
Can high-temperature silicone paint be applied over rust?
No. Rust and scale must be removed completely by blasting or mechanical preparation. Rust trapped under a silicone coating will expand when heated, blister the film, and eventually destroy the coating from beneath. High-temperature work is the most unforgiving preparation on the site.
Is silicone paint suitable for food contact or cookware?
No. The standard industrial silicone grades are not certified for food contact. Contact with food-grade requirements needs a specific certified coating and supporting documentation.
Related products
These products are normally used in the same system as the product described above.
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