Tinta de silicone para alta temperatura Silicone Heat-Resistant
One-component silicone heat-resistant coating · Si-O bond 452kJ/mol · Long-term stable at 600℃
Tinta de silicone para alta temperatura(Silicone Heat-Resistant)é um fundo anticorrosivo bicomponente (2K) de alto desempenho em que a resina epóxi curada com poliamida atua como formador de filme e o pó de zinco ultrfino (teor em filme seco ≥70 %) como principal pigmento anticorrosivo.O revestimento fornece proteção ativa contra a corrosão por meio do mecanismo de proteção catódica por anodo de sacrifício do zinco sobre o aço; mesmo que o filme seco seja danificado localmente, o pó de zinco ao redor continua a fornecer proteção eletroquímica ao aço exposto.CompliesHG/T 3668-2020《Tinta de silicone para alta temperatura》tipo 2; combinado com uma camada intermediária epóxi MIO (mica-ferro) e um acabamento de poliuretano / fluorocarbono, o sistema resiste a névoa salina neutra ≥1000 h e atende aos requisitos da classe de alta corrosividade C4-C5 da ISO 12944.É amplamente utilizada como fundo anticorrosivo em grandes obras, como pontes sobre o mar, plataformas petrolíferas offshore, tanques de armazenamento petroquímicos, torres de transmissão elétrica, torres de turbinas eólicas e grandes edifícios com estrutura de aço.
ProductsVisão geral
Visão geral do produto: para quem? qual problema resolve?
Silicone heat-resistant paint is a heavy-duty anti-corrosion primer designed for steel structures requiring long-term anti-corrosion protection of over 15 years in C4-C5 highly corrosive environments.The core problem it solves is: ordinary anti-rust paint fails within 3-5 years in harsh environments such as coastal areas, chemical atmospheres, and high humidity, while silicone heat-resistant paint, through the dual mechanism of "cathodic protection + barrier protection," can provide 15-25 years of long-term protection when combined with intermediate coat and topcoat—significantly reducing life-cycle maintenance costs.
Definição do produto
Silicone Heat-Resistant, Chinese standard number HG/T 3668-2020, is a two-component (2K) ambient-temperature crosslinking curing anti-corrosion primer using epoxy resin (bisphenol A type, CAS 25068-38-6) and polyamide curing agent (CAS 68410-23-1) as film-forming substances, ultrafine spherical zinc powder (CAS 7440-66-6, particle size 3-8μm, mass fraction in dry film ≥70%) as anti-rust pigment, and xylene/n-butanol as solvent system.
Mecanismo de proteção anticorrosiva:High content of zinc powder particles in the coating forms a continuous conductive pathway between the particles themselves and between the zinc and the steel substrate. Since the standard electrode potential of zinc (-0.76V vs SHE) is lower than that of iron (-0.44V), zinc acts as the anode in the corrosion microcell and preferentially undergoes oxidation reaction (Zn → Zn²⁺ + 2e⁻). The released electrons flow through the conductive network to the steel surface, causing the steel to be cathodically polarized below its immune potential—this is known as "sacrificial anode cathodic protection." Meanwhile, the corrosion products of zinc (ZnO, Zn(OH)₂, basic zinc carbonate, etc.) gradually fill the coating pores, forming a dense secondary barrier layer—the "corrosion product self-healing effect."
Dados de desempenho principais:
- The dry film zinc powder content is ≥70% (compliant with HG/T 3668-2020 Category 2).
- Volume solids content ≥60% (ISO 3233:1998)
- Pull-off adhesion ≥6 MPa (ISO 4624:2016, test doll diameter 20mm)
- Single coating resistance to neutral salt spray (NSS) ≥400h (ISO 9227:2022, rust width at the crisscrossing ≤2mm)
- The complete system (epoxy zinc-rich 80μm + epoxy micaceous iron oxide intermediate coat 150μm + polyurethane topcoat 80μm) has an NSS resistance of ≥1000h.
- Mixed application period: 4-8 hours (23°C, main agent: curing agent = 10:1 w/w)
Substratos adequados e limitações:Applicable to carbon steel, low-alloy steel, and cast iron substrates blasted to Sa2.5 (ISO 8501-1:2007). Not recommended for direct application on galvanized steel (the passivation film on the zinc surface will block the conductive path—sweep blasting pretreatment or an epoxy primer transition layer is advised), stainless steel (the surface passivation film must be removed first), or aluminum alloy (risk of galvanic corrosion—the potential difference between zinc and aluminum is too large). Application temperature limits: standard type 5–40°C (below 5°C, the epoxy-amine crosslinking reaction rate is extremely low, resulting in incomplete coating curing).
Posição no setor e aplicações:Tinta de silicone para alta temperaturais one of the most widely used primer types in global heavy-duty anticorrosive coating systems (ISO 12944-5:2019 systems A2.08/A3.08/A4.08, etc.), forming a classic triple-protection system with epoxy MIO intermediate coat and PU/fluorocarbon/polysiloxane topcoat. Typical applications include: Akashi Kaikyo Bridge Japan (opened 1998, 100-year design life), Hong Kong-Zhuhai-Macao Bridge (opened 2018, 500,000m² steel box girders), North Sea offshore oil platforms (NORSOK M-501 system certification), etc. According to Grand View Research, the global zinc-rich primer market was approximately USD 2.8 billion in 2023, with Asia-Pacific accounting for 48% share.
ProductsFeatures

1. Cathodic protection (sacrificial anode) mechanism
The dry film contains ≥70% zinc powder forming a continuous conductive network. The standard electrode potential of zinc (-0.76V) is lower than that of iron (-0.44V). When corrosion occurs, zinc preferentially oxidizes (Zn→Zn²⁺+2e⁻), releasing electrons to cathodically polarize the steel to its immunity potential—even if the coating has 3-5mm damage, the surrounding zinc powder can still provide continuous electrochemical protection for the exposed steel, which makes the anti-corrosion performance of silicone heat-resistant paint far exceed that of ordinary anti-rust primers that rely solely on physical barrier.

2. Superior corrosion resistance and durability
Single coating NSS≥400h (HG/T 3668 Type 2), system NSS≥1000h when combined with epoxy micaceous iron oxide intermediate coat + polyurethane topcoat. Designed service life of 15-25 years under ISO 12944-2 C5-M extremely high corrosion environment (marine splash zone). The Akashi Kaikyo Bridge in Japan adopted silicone heat-resistant paint system in 1998, and the coating remains intact after more than 25 years—actual service life far exceeds the design value.

3. Excellent compatibility
It has excellent inter-coat adhesion (pull-off method ≥5MPa) with epoxy micaceous iron oxide intermediate coat (MIO barrier layer), polyurethane topcoat (weather-resistant decorative layer), fluorocarbon topcoat (ultra-weather-resistant ≥25 years), and polysiloxane topcoat (high weather resistance + high chemical resistance). Silicone heat-resistant paint + epoxy micaceous iron oxide intermediate coat + topcoat is the most classic three-coat heavy-duty anti-corrosion system in ISO 12944-5—primer provides cathodic protection, intermediate coat provides thickness and physical barrier, topcoat provides weather resistance and decoration.

4. Wide adaptability to construction
Supports airless spray (nozzle 0.43–0.53 mm, 15–25 MPa), air spray, and brush/roller application (for small-area touch-ups). Single-pass dry film thickness: 60–80 μm. Mixing ratio: 10:1 (w/w). Pot life: 4–8 h (23°C). Wide temperature range for application (5–40°C); low-temperature formulation can be applied down to –5°C. Continuous stirring is required during spraying to prevent zinc powder sedimentation—use of a pressure pot with a pneumatic agitator is recommended to ensure coating uniformity.

5. Shop Primer Solderability
Fórmula especializada (película seca de 15-25 μm) pode ser usada como primer de oficina — após aplicação na fábrica de pré-fabricação de estruturas de aço, o aço ainda pode ser submetido a processos de soldagem e corte. A fumaça de soldagem atende aos limites de exposição ocupacional (GBZ 2.1-2019), e a taxa de aprovação do exame radiográfico de soldas não é afetada. Adequado para pintura automatizada em linha de produção de estruturas de aço — pode ser manuseado e empilhado 3-5 minutos após a pulverização. Atenção: apenas a fórmula especializada de primer de oficina possui soldabilidade — a película seca padrão de 60-80 μm não é adequada para soldagem.

6. Environmental Compliance · Global Standards
Complies with HG/T 3668-2020 (China) Standard Class 2, ISO 12944-5:2019 system numbers A2.08/A3.08/A4.08, NORSOK M-501:2022 (Norwegian Petroleum Industry) System 1, SSPC Paint 20 (USA) Zinc-rich Primer Type II (≥77% zinc powder). VOCs<420g/L(GB 30981-2020),可通过ROHS 2011/65/EU和REACH (EC) 1907/2006ComplianceTesting。Products碳足迹约2.8kg CO₂e/kg(摇篮到大门,SimaPro 9.5计算)——低于Primer inorgânico rico em zinco(3.5kg CO₂e/kg)。
TécnicoParameters
Parâmetros fisicoquímicos
Secagem e desempenho
• March 2024, National Coatings Quality Inspection and Testing Center Test Report (No.: NTC-2024-0315-ZR)
· HG/T 3668-2020 "Silicone Heat-Resistant Paint" Type 2 specifications
The data in this table are typical values under standard laboratory conditions (23±2°C, 50±5%RH). Actual values may vary slightly depending on the substrate condition, construction process, and environmental conditions. Please contact technical support to obtain the batch COA (Certificate of Appointment).
ApplicationProcess
Preparo de superfície
Sandblast to Sa2.5 (ISO 8501-1:2007), roughness Rz 40-75μm. Manual rust removal ≥ St3. Grease must be removed with SSPC-SP1 solvent. Primer application (RH) must be completed within 4 hours after sandblasting.<50%可延至8h)。禁忌:雨天/雾天/Temperatura do substrato低于露点3°C时禁止Application。
Mistura / preparação
Stir the main agent for 3-5 minutes until the zinc powder is completely and evenly dispersed. Add the curing agent at a ratio of 10:1 (w/w) and continue stirring for 3-5 minutes. Let it stand for 15-30 minutes (23°C) to mature. Continuously stir during application to prevent zinc powder from settling—a pneumatic mixer is recommended. The mixed usable period is 4-8 hours (23°C). Do not dilute and use materials that have gelled beyond this period.
Aplicação do primer
Airless spraying (recommended): Nozzle 0.43-0.53mm/0.017-0.021", pressure 15-25MPa. Air spraying: Nozzle 1.5-2.0mm, pressure 0.3-0.5MPa. Brush/roller coating is only suitable for small-area pre-coating and repair. Single-coat DFT 60-80μm. Pre-coat welds, free edges, etc.
Secagem e repintura
Surface dry ≤ 1h (23°C), hard dry ≤ 24h. Minimum recoating interval 8h (23°C). Maximum recoating interval 7d—exceeding this interval requires sandblasting (low pressure 0.2-0.3MPa, non-metallic abrasive) to remove surface zinc salts (basic zinc carbonate). Matching: Epoxy micaceous iron oxide intermediate coat 100-150μm → Polyurethane/fluorocarbon topcoat 50-80μm × 2.
Inspection and Acceptance
DFT measurement (ISO 2808:2019, SSPC-PA2): 80% of measuring points ≥ specified value, no measuring points<80%规定值。AderênciaTesting(Ensaio de arrancamento ISO 4624或ISO 2409Método de corte cruzado)。detecção de furos de alfinete(Método da esponja úmida,67.5V/90V)。Inspeção visual:无Sagging/漏涂/起泡/缩孔/Pó de zinco不均匀。
AplicaçõesField/Area

Petrochemical high-temperature pipelines
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Power plant boiler outer walls
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Automotive Exhaust Pipe Coating
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Industrial Oven Interior Walls
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Chimney Exterior Anti-Corrosion
Tall chimney structures, silver heat-resistant anti-corrosion coating

Refinery Reactors
Large chemical equipment, silver high-temperature protective coating

High-Temperature Paint Spraying Application
Spray gun applying silver coating, worker protective equipment

Pipe Flanges and Valves
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Incinerator outer wall
Industrial incineration equipment, silver high-temperature resistant protection

Marine engine exhaust pipe
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High-temperature paint production line
Paint bucket filling and packaging, factory production quality inspection

Central heating pipeline
Urban heating network, silver high-temperature resistant coating
Perguntas Frequentes -Perguntas frequentes
BaixarCentro
TDS Product Technical Specifications
Technical Data Sheet
Compliant with HG/T 3668-2020 standard
MSDS (Material Safety Data Sheet)
Material Safety Data Sheet
16 Chapters · GB/T 16483-2008
Color Card (Product Color Card)
Color Card
Cores padrão cinza-aço / vermelho-ferro
Guia de aplicação
Application Guide
Complete construction guidance + defect countermeasures
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Silicone high-temperature resistant paint·Venda direta da fábrica
Free sample testing · Customized technical solutions · On-site construction guidance · ISO 9001 certified factory · 48-hour rapid response
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