Organosilicon High-Temperature Coatings
A complete range of 2-pack and 3-pack organosilicon high-temperature anti-corrosion coating systems covering continuous service temperatures from 200 °C to 700 °C — including silicone alkyl zinc-rich primers with cathodic protection, aluminium-pigmented silicone topcoats for 500 °C service, and epoxy-organosilicon and epoxy-phenolic systems for chemical-resistant high-temperature protection on steel chimneys, furnaces, boilers and petrochemical high-temperature equipment.
Products
Max Service Temperature
Surface Prep Standard
High-Temperature Anti-Corrosion Coating Products
Nine organosilicon, epoxy-organosilicon and epoxy-phenolic high-temperature protective coating products — each rated to a defined continuous service temperature from 200 °C to 700 °C, all requiring Sa 2.5 blasted steel substrate preparation.
The Huili Coating High-Temperature Anti-Corrosion Coatings Series covers the full range of thermal protection requirements for steel structures and equipment in power generation, petrochemical processing and heavy industrial environments. The W61 series is built on organosilicon (silicone) resin chemistry — alkyl silicate binders with ultra-fine zinc powder primers providing cathodic protection and weld-through capability, combined with organosilicon topcoats pigmented with heat-stable aluminium and corrosion-resistant speciality pigments. Service temperatures span from 200 °C continuous on steel chimney stacks and exhaust ducting through to 700 °C on blast furnace shells, hot-blast stoves and high-temperature petrochemical reactor structures. The W61-500 three-pack aluminium-pigmented silicone coating provides long-term high-temperature corrosion protection at up to 500 °C, while W61-600 and W61-700 three-pack systems use speciality high-temperature organosilicon resins for extreme-heat structural steel protection. The WH-300 epoxy-organosilicon coating adds chemical resistance to acid, alkali and salt for 200–300 °C equipment, and PLHF-4 epoxy-phenolic delivers superior immersion and corrosion resistance at elevated temperatures for chemical plant, water treatment and storage tank applications.
Standard Organosilicon Systems (3)
W61-400 Silicone High-Temperature Anti-Corrosion Coating
2K silicone high-temperature coating rated to 400°C continuous service with cathodic protection primer for blast furnaces, chimneys, steam pipelines and heat exchangers. Ambient cure, weld and cut tolerant. Sa2.5 prep, 50–60µm DFT.
W61-250/300 Silicone High-Temperature Anti-Corrosion Coating
2K silicone high-temperature coating system rated to 250°C/300°C with cathodic protection primer and weather-resistant topcoat for steel chimneys and industrial structures. Weld and cut tolerant, fast-drying. Sa2.5 prep, 50µm DFT primer.
W61-200 Silicone High-Temperature Anti-Corrosion Coating
2K silicone high-temperature coating system rated to 200°C with cathodic protection primer and weather-resistant topcoat for steel chimneys and structures. Weld and cut tolerant, fast-drying. Sa2.5 prep, 50µm DFT primer.
Extreme Heat Systems (2)
W61-600 Silicone High-Temperature Anti-Corrosion Coating
3-component silicone high-temperature coating rated to 600–700°C for steel equipment and industrial components requiring extreme heat protection. Outstanding thermal cycling resistance and adhesion. Sa2.5 prep, 80–100µm total DFT.
W61-500 Silicone Aluminium Pigmented High-Temperature Topcoat
3-component silicone aluminum high-temperature coating rated to 500°C for industrial equipment and steel surfaces. Excellent adhesion and thermal cycling resistance for high-temperature process equipment. Sa2.5 prep, 80–100µm total DFT.
Epoxy-Based HT Coatings (1)
WH-300 Epoxy Silicone Heat-Resistant Coating
2K epoxy silicone heat-resistant coating system rated to 300°C with acid, alkali and salt resistance for steel equipment and process components. Ambient cure, Sa2.5 prep required. 110µm+ total DFT system.
Full Specification Comparison
Key parameters across all 6 high-temperature anti-corrosion coating products, ordered by maximum continuous service temperature for system selection and specification writing.
| Product | Max Service Temp | DFT / System | Pack Type | Mix Ratio | Pot Life | Surface Dry | Min Temp | Application | Key Feature |
|---|---|---|---|---|---|---|---|---|---|
| W61-200 Organosilicon HT System | 200 °C | 100–110 μm / 4c | 2-Pack | 50:1 | 6 h | Primer 10 min / TC 1 h | 5 °C | Airless / Brush / Roll | Zn-rich primer, weld-through |
| W61-250 Organosilicon HT System | 250 °C | 100–110 μm / 4c | 2-Pack | 50:1 | 6 h | Primer 10 min / TC 1 h | 5 °C | Airless / Brush / Roll | Zn-rich primer, cathodic protection |
| W61-300 Organosilicon HT System | 300 °C | 100–110 μm / 4c | 2-Pack | 50:1 | 6 h | Primer 10 min / TC 1 h | 5 °C | Airless / Brush / Roll | Thermal cycling resistant |
| W61-400 Organosilicon HT System | 400 °C | 100–110 μm / 4c | 2-Pack | 50:1 | 6 h | Primer 10 min / TC 1 h | 5 °C | Airless / Brush / Roll | Room-temp self-cure, furnace / boiler |
| W61-500 Organosilicon Aluminium HT | 500 °C | 80–100 μm / 4–5c | 3-Pack | 18:0.72:5.4 | 4 h | 1 h | 5 °C | Airless / Air Spray / Brush / Roll | Aluminium pigmented, silver-white |
| W61-600 Organosilicon HT System | 600 °C | 80–100 μm / 2+2c | 3-Pack | 50:2:50 | 4 h | 0.5 h | 5 °C | Airless / Air Spray / Brush / Roll | Extreme heat, blast furnace |
| W61-700 Organosilicon HT System | 700 °C | 80–100 μm / 2+2c | 3-Pack | 50:2:50 | 4 h | 0.5 h | 5 °C | Airless / Air Spray / Brush / Roll | Max thermal rating, coke oven |
| WH-300 Epoxy-Organosilicon HT Coating | 300 °C | 110 μm+ / 4–5c | 2-Pack | — | 4 h | 1 h | 5 °C | Spray / Brush / Roll | Acid / alkali resistant, chemical plant |
| PLHF-4 Epoxy Phenolic HT Coating | HT Immersion | Per specification | 2-Pack | — | — | 1 h | — | Spray / Brush | Immersion + chemical resistance |
Application Environments
High-temperature anti-corrosion coatings are specified wherever steel structures or equipment surfaces are subject to sustained thermal exposure combined with atmospheric corrosion, chemical attack or thermal cycling.
Steel Chimney & Exhaust Stack Coating
Industrial steel chimneys, exhaust stacks and flue gas ducting in power stations, cement plants and industrial boiler installations operate continuously at 200–400 °C and are exposed to aggressive flue gas corrosion and outdoor weathering simultaneously. The W61-200 to W61-400 series provides the correct thermal rating for each operating temperature, with the silicone zinc-rich primer delivering cathodic corrosion protection and weld-through capability that allows application before final fabrication. Sa 2.5 blast preparation with 40–50 μm roughness profile is required for full system adhesion on steel chimney structures.
Blast Furnace & Metallurgical Equipment
Blast furnace shells, hot-blast stove external surfaces, coke oven structural steel and metallurgical plant equipment operate at 500–700 °C with cyclic thermal loading that causes rapid coating failure in conventional systems. W61-500 three-pack aluminium organosilicon coating provides continuous 500 °C protection with a distinctive silver-white finish, while W61-600 and W61-700 three-pack systems extend coverage to 700 °C for the most thermally demanding blast furnace and coke oven structural steel corrosion protection applications. Sa 2.5 blast to Rz 40–70 μm is mandatory.
Petrochemical Plant High-Temperature Equipment
Heat exchangers, fired heater casings, steam pipework, process vessel external surfaces and boiler feed systems in petroleum refining and chemical processing facilities require coatings combining high-temperature resistance with resistance to chemical atmosphere corrosion from sulphur dioxide, acid gases and hydrocarbon vapours. WH-300 epoxy-organosilicon coating provides acid, alkali and salt resistance at up to 300 °C, making it the preferred choice for chemical plant high-temperature equipment where both thermal and chemical attack are present simultaneously.
Storage Tanks & Water Infrastructure
Seawater intake systems, groundwater treatment plant, freshwater storage tanks and chemical storage vessels require coatings with simultaneous immersion resistance, corrosion protection and elevated temperature capability for service in hot climates or heated storage applications. PLHF-4 epoxy-phenolic heat-resistant coating provides superior full-immersion corrosion resistance and chemical resistance in seawater, groundwater and process chemical environments, cured at 60 °C to achieve maximum crosslink density and immersion durability for long-term tank internal lining service.
Technical Articles & Guides
Selecting the correct high-temperature coating system requires matching the coating chemistry and thermal rating to the actual continuous operating temperature and thermal cycling severity of the equipment — not just the peak temperature. The resources below provide specification guidance and application data for organosilicon and epoxy-based high-temperature anticorrosion coatings on steel structures and industrial equipment.
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