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 Heat-Resistant Primer: 600°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 | DS600°C |
|---|---|
| Trade name | Silicone Heat-Resistant Primer |
| Category | High-temperature silicone coatings |
| System role | Primer - first coat on the prepared substrate |
| Manufacturer description | 600°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
A primer is the first layer in the coating system, and it decides how well everything that follows will adhere. Its job is to wet out the prepared substrate, key into its surface, and hold the coating together as one film.
Applied thin, a primer wets and anchors. Applied too thick, it becomes brittle, stresses the substrate and can peel as a sheet. The right dry film thickness for a primer is the one that covers the surface completely without building a film that can crack.
Purpose in the system: Applied directly to the prepared substrate, before any intermediate coat or topcoat.
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 brush, roller, conventional air spray or airless spray depending on the product. Primers are usually thin enough to spray well and wet out a blasted surface completely.
Work at a consistent wet film thickness and avoid over-application at edges, welds and connections — sags and runs at these details are the most common primer defect.
Allow the primer to reach the specified state before overcoating. On some systems a primer should be topcoated while it is still slightly tacky for best intercoat adhesion; on others a full cure with an abrasion between coats is required.
Mixing, ratio and induction time
Two-pack primers are mixed in the ratio stated on the data sheet, typically 4:1 or 5:1 by volume for epoxy primers and 3:1 for polyaspartic systems. Allow the full induction time before thinning and application, and observe the pot life strictly — a primer that has begun to gel will not perform.
Cure, recoat window and service readiness
Recoat windows depend on temperature, humidity and film thickness, but a typical epoxy primer is recoatable after 12 to 24 hours at 20-25 °C and needs 7 days for full cure. Polyaspartic primers cure far faster and may be recoatable within 2 to 4 hours. Exceeding the maximum recoat interval requires the surface to be abraded and re-cleaned before the next coat.
Coverage and thickness calculation
Typical dry film thickness is 40-80 µm for a conventional primer and 60-100 µm for a high-build anticorrosive primer. At 60 µm, one litre covers roughly 12-14 m². Always measure the wet film and calculate back from the solids content to confirm the specified DFT is being achieved.
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 the surface preparation standard and the blast profile before coating begins — this is recorded on the inspection report.
- Verify film thickness by wet film gauge during application and by magnetic induction gauge or dry film readings on the completed coat.
- Holiday test the primer before overcoating, particularly over welds, connections and edges.
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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