HG/T 3668-2020 Type 2 · Dry film zinc content ≥70%

Imprimación epoxi rica en zinc Epoxy Zinc-Rich Primer

Two-component epoxy polyamide/zinc-rich heavy-duty anticorrosive primer — sacrificial anode cathodic protection

Epoxy Zinc-Rich Primer is a high-performance two-component anticorrosive primer that uses epoxy resin and polyamide curing agent as the film-forming material, with ultrafine zinc powder (dry film content ≥70%) as the main antirust pigment. The coating provides active corrosion protection through the sacrificial anode cathodic protection mechanism of zinc powder on steel—even if the paint film is locally damaged, the surrounding zinc powder continues to provide electrochemical protection for the exposed steel. It complies with the Class 2 standard of HG/T 3668-2020 "Epoxy Zinc-Rich Primer." When used in combination with an epoxy micaceous iron oxide intermediate coat and a polyurethane/fluorocarbon topcoat, the system achieves neutral salt spray resistance ≥1000h, meeting the requirements of ISO 12944 C4-C5 high-corrosion environments. It is widely used as an anticorrosive primer for major projects such as sea-crossing bridges, offshore oil platforms, petrochemical storage tanks, transmission towers, wind turbine towers, and large steel structure factories.

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≥70%
contenido de polvo de zinc en la película seca
1000h+
Resistencia del sistema a la niebla salina
≥6MPa
adherencia por tracción directa (pull-off)
≥60%
Sólidos en volumen
HG/T3668
Norma aplicable del producto
Sa2.5
Grado de preparación del sustrato
5~40°C
Temperatura ambiente de aplicación
2K/Two-Component10:1
Relación de mezcla
ISO12944
Nivel de corrosión C4-C5
Product Overview

ProductsDescripción general

Resumen del producto: ¿para quién? ¿qué problema resuelve?

Epoxy zinc-rich primer is a heavy-duty anticorrosive primer designed for steel structures requiring long-term corrosion protection of over 15 years in C4-C5 high-corrosion environments.The core problem it solves is that ordinary anti-rust paint fails within 3–5 years in harsh environments such as coastal areas, chemical atmospheres, and high humidity. In contrast, epoxy zinc-rich primer, through the dual mechanism of "cathodic protection + barrier protection," can provide 15–25 years of long-term protection when used with an intermediate coat and topcoat—significantly reducing the full life cycle maintenance cost.

Definición del producto

Epoxy Zinc-Rich Primer, Chinese standard number HG/T 3668-2020, is a two-component (2K) ambient temperature crosslinking and curing anticorrosive 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 3-8 μm, mass fraction in dry film ≥70%) as anticorrosive pigment, and xylene/n-butanol as the solvent system.

Mecanismo de protección anticorrosiva:High-content zinc powder particles in the coating form continuous conductive pathways between themselves and with 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 corrosion microcells and preferentially undergoes oxidation (Zn → Zn²⁺ + 2e⁻). The released electrons flow through the conductive network to the steel surface, cathodically polarizing the steel 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."

Datos de rendimiento clave:

  • The dry film zinc powder content is ≥70% (compliant with HG/T 3668-2020 Category 2).
  • Contenido de sólidos en volumen ≥60 % (ISO 3233:1998)
  • Adherencia por método de tracción ≥ 6 MPa (ISO 4624:2016, con dolly de 20 mm de diámetro para la prueba).
  • Resistencia a la niebla salina neutra (NSS) de una sola capa ≥ 400 h (ISO 9227:2022, ancho de corrosión en la línea de rayado ≤ 2 mm).
  • Sistema combinado (imprimación epoxi rica en zinc 80 μm + capa intermedia epoxi de mica de hierro 150 μm + pintura de poliuretano 80 μm) Resistencia a NSS ≥ 1000 h.
  • Mixed application period: 4-8 hours (23°C, main agent: curing agent = 10:1 w/w)

Sustratos aptos y limitaciones: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).

Posición en el sector y aplicaciones:Epoxy zinc-rich primer is 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 together with epoxy micaceous iron oxide intermediate paint and polyurethane/fluorocarbon/polysiloxane topcoat. Typical application projects include: Japan's Akashi Kaikyo Bridge (opened in 1998, design life of 100 years), Hong Kong-Zhuhai-Macao Bridge (opened in 2018, 500,000 m² of steel box girders), and the Beihai offshore oil platform (NORSOK M-501 system certified). According to Grand View Research data, the global zinc-rich primer market size in 2023 was approximately USD 2.8 billion, with the Asia-Pacific region accounting for a 48% share.

Features

ProductsFeatures

阴极保护牺牲阳极原理

1. Mecanismo de protección catódica (ánodo de sacrificio)

The dry film of the coating 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 is preferentially oxidized (Zn → Zn²⁺ + 2e⁻), releasing electrons that cathodically polarize the steel to an immune potential—even if the coating has 3-5mm of damage, the surrounding zinc powder can still provide continuous electrochemical protection for the exposed steel. This makes the anti-corrosion performance of epoxy zinc-rich primer far superior to that of ordinary anti-rust primers that rely solely on physical shielding.

耐盐雾测试1000小时

2. Resistencia a la corrosión y durabilidad superiores

Single coating NSS ≥ 400h (HG/T 3668 Type 2), system NSS ≥ 1000h after matching with epoxy micaceous iron oxide intermediate paint + polyurethane topcoat. Designed service life of 15-25 years under ISO 12944-2 C5-M very high corrosivity environment (marine splash zone). The Akashi Kaikyo Bridge in Japan adopted an epoxy zinc-rich primer system in 1998, and the coating has remained intact for over 25 years—actual service life far exceeds the design value.

重防腐涂层配套体系

3. Excelente compatibilidad

It exhibits excellent interlayer adhesion (pull-off test ≥5 MPa) with epoxy micaceous iron oxide intermediate paint (MIO barrier layer), polyurethane topcoat (weather-resistant decorative layer), fluorocarbon topcoat (super weather-resistant, ≥25 years), and polysiloxane topcoat (high weather resistance + high chemical resistance). The combination of epoxy zinc-rich primer, epoxy micaceous iron oxide intermediate paint, and topcoat is the most classic heavy-duty anti-corrosion three-coat system in the ISO 12944-5 standard—where the primer provides cathodic protection, the intermediate coat supplies thickness and physical barrier, and the topcoat offers weather resistance and decoration.

无气喷涂施工

4. Amplia adaptabilidad de aplicación

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.

车间底漆焊接应用

5. Imprimación de taller soldable (Shop Primer)

Specialized formulation (dry film 15-25μm) can be used as a shop primer—after application in the steel structure prefabrication plant, the steel remains suitable for welding and cutting. Welding fumes comply with occupational exposure limits (GBZ 2.1-2019), and the pass rate of X-ray inspection of welds is not affected. Suitable for automated spray painting on steel structure production lines—parts can be handled and stacked within 3-5 minutes after spraying. Note: Only the specialized shop primer formulation is weldable—the standard type with a dry film thickness of 60-80μm is not suitable for welding.

环保合规高固含

6. Cumplimiento ambiental: estándares globales

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) 1907/2006Cumplimiento normativoTesting。Products碳足迹约2.8kg CO₂e/kg（摇篮到大门，SimaPro 9.5计算）——低于Imprimante inorgánico rico en zinc（3.5kg CO₂e/kg）。

Technical Specifications

TécnicoParameters

Parámetros fisicoquímicos

Tipo de productoRecubrimiento epoxi poliamida/polvo de zinc bicomponente (2K EP/Zn)
contenido de polvo de zinc en la película seca≥70% (HG/T 3668-2020 Clase 2)
Sólidos en volumen60±3%（ISO 3233:1998）
Contenido de sólidos en masa85±3%（GB/T 1725-2007）
Densidad (mezclada)2.10-2.30 g/cm³（20°C）
Relación de mezcla (en peso)Componente principal: agente de curado = 10:1
Pot-life (vida de la mezcla)4-8h（23°C）/ 2h（35°C）
Espesor de película seca (EPS) recomendado60-80 μm / capa
Rendimiento teórico0.17-0.22 kg/m²（75μm DFT）
Contenido de COV<420 g/L（GB 30981-2020）
Packaging Specs30kg base agent + 3kg hardener kit

Secado y rendimiento

Tiempo de secado superficial≤1 h (23 °C, GB/T 1728-2020 método B)
Tiempo de secado total≤24 h (23 °C, método A según GB/T 1728-2020)
Curado completo7 días (23 °C, estabilidad Tg por método DSC)
Intervalo mínimo de repintado8h（23°C）
Intervalo máximo de repintado7 days (23°C; sand removal is required if the expiration date is exceeded)
adherencia por tracción directa (pull-off)≥6 MPa（ISO 4624:2016，dolly Ø20mm）
Adherencia por corte en rejilla≤1 grado (ISO 2409:2020, distancia entre cortes 1 mm)
Resistencia al impacto≥50 kg·cm（GB/T 1732-2020）
resistencia a la niebla salina neutra (NSS)Capa única ≥400 h / Sistema completo ≥1000 h (ISO 9227:2022).
Temperatura de servicio continuo-20°C ~ 150°C
Base de los parámetros técnicos
· Marzo de 2024: Informe de ensayo del Centro Nacional de Inspección y Ensayo de Calidad de Recubrimientos (N.º: NTC-2024-0315-ZR).
HG/T 3668-2020 "Epoxy Zinc-Rich Primer" Type 2 Indicators
· Los datos de esta tabla son valores típicos en condiciones estándar de laboratorio (23±2 °C, 50±5% HR). Los valores reales pueden variar ligeramente según el estado del sustrato, el proceso de aplicación y las condiciones ambientales. Contacte al soporte técnico para obtener el COA (Certificado de Análisis) por lote.
Application Process

ApplicationProcess

1

Preparación de la superficie

Granallado hasta grado Sa2.5 (ISO 8501-1:2007), con rugosidad Rz 40-75 μm. La limpieza manual debe ser ≥ St3. Las grasas deben eliminarse con disolvente según SSPC-SP1. Aplicar la capa de imprimación dentro de las 4 horas posteriores al granallado (HR<50%可延至8h）。禁忌：雨天/雾天/Temperatura del sustrato低于露点3°C时禁止Application。

2

Preparación de la mezcla

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.

3

Aplicación de imprimación

Boquilla recomendada para pulverización sin aire: 0.43-0.53 mm / 0.017-0.021 pulgadas, presión 15-25 MPa. Pulverización con aire: boquilla 1.5-2.0 mm, presión 0.3-0.5 MPa. Brocha/rodillo solo para pre-recubrimiento y retoques en áreas pequeñas. DFT por capa 60-80 μm. Pre-recubrir soldaduras, bordes libres, etc.

4

Secado y repintado

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.

5

Inspection and Acceptance

Medición DFT (ISO 2808:2019, SSPC-PA2): el 80% de los puntos de medición ≥ valor especificado, sin puntos de medición.<80%规定值。AdherenciaTesting（Ensayo de adherencia por arrancamiento ISO 4624或ISO 2409Método de corte cruzado）。detección de picaduras（Método de esponja húmeda，67.5V/90V）。Inspección visual：无Descuelgue/漏涂/起泡/缩孔/Polvo de zinc不均匀。

Applications

AplicacionesField/Area

跨海大桥

Puentes marítimos / fluviales

Cajones de acero, torres de puente, nervios de arco

海上石油平台

Plataforma petrolera marina

Jackets, cubiertas, módulos habitacionales

石化储罐

Paredes exteriores de tanques petroquímicos

Tanques de crudo / productos refinados / productos químicos

输电铁塔

Torres de transmisión / torres tubulares

Estructuras de acero para líneas de alta / muy alta tensión

钢结构厂房

Grandes naves de estructura metálica

Naves industriales, recintos deportivos

港口机械

Maquinaria portuaria

Grúas de muelle, grúas pórtico, descargadores de barcos

风电塔筒

Torres de aerogeneradores

Torres de aerogeneradores terrestres / marinos

船舶与海洋工程

Construcción naval e ingeniería offshore

Bloques de casco, tanques de lastre, cubiertas

管道防腐

Anticorrosión de paredes externas de tuberías

Tuberías de larga distancia de petróleo, gas y agua

矿山与工程机械

Maquinaria minera / de construcción

Excavadoras, trituradoras, equipos de transporte

化工装置

Instalaciones químicas / de refino

Reactores, intercambiadores de calor, estructura de racks de tuberías

水处理设施

Tratamiento de agua / infraestructuras hidráulicas

Depuradoras, compuertas, rejillas de retención

FAQ

Preguntas Frecuentes -FAQ

The anti-corrosion mechanism of epoxy zinc-rich primer is based on the electrochemical principle of cathodic protection: the high content (≥70%) of zinc powder particles in the coating forms a conductive pathway and establishes electrical continuity with the steel substrate. Since the standard electrode potential of zinc (-0.76V) is more negative than that of iron (-0.44V), zinc preferentially oxidizes when corrosion occurs: Zn → Zn²⁺ + 2e⁻. The released electrons flow through the conductive network to the steel surface, causing cathodic polarization—when the potential drops below -0.85V (vs Cu/CuSO₄), effective protection is achieved. If the zinc powder content is insufficient (<60%），Polvo de zinc颗粒被resina epoxi绝缘包裹无法形成连续导电通路——protección catódica失效——Coating仅剩物理屏蔽功能，Anticorrosive寿命大幅缩短。这就是HG/T 3668Norma严格RequisitosContenido de polvo de zinc的Causa：第1类≥80%（高Anticorrosive），第2类≥70%（NormaAnticorrosión pesada），Clase 3≥60%（一般Anticorrosive）。
No puede usarse por separado.Three reasons: (1) Epoxy zinc-rich primer single-layer exposure to acidic (acid rain pH<5.6）或碱性（Hormigón渗出碱液）Environment中，Polvo de zinc会被Quick化学消耗（反应速率较中性Environment快3-10倍），丧失protección catódica能力。Capa intermedia epoxi MIO（MIOCarga laminar层叠排列形成"Efecto laberinto (camino tortuoso)"）Provides物理屏蔽层——ProtecciónPolvo de zinc不过早消耗。(2)resina epoxi含芳香醚键——紫外光（290-400nm）照射下3-6meses即开始光氧化降解——粉化/变色/失光。Pintura de acabado de poliuretano/fluorocarbono（含UV吸收剂和HALS光稳定剂）ProvidesProtección climática。(3)Sistema de recubrimiento compatibleDFT total更厚（≥280μm）——Anticorrosive等级更高。ISO 12944-5recomendado的Anticorrosión pesadacompatible：Imprimación epoxi rica en zinc60-80μm + Capa intermedia epoxi MIO100-150μm + Capa final de poliuretano50-80μm×2。
According to HG/T 3668-2020, three types of zinc content are selected: Type 1 (≥80%) — suitable for C5/CX extremely corrosive environments (offshore splash zones, tidal zones, chemical plant acid mist areas) or major projects with a design life >25 years. It offers the highest cathodic protection efficiency, but excessive zinc powder increases internal stress and reduces flexibility (flexibility ≥3mm vs. Type 2's ≥2mm), and has the highest unit price. Type 2 (≥70%) — a general heavy-duty anti-corrosion primer suitable for C4-C5 environments (coastal industrial areas, sea-crossing bridges, petrochemical storage tanks), offering the best cost-performance ratio — an optimal balance between anti-corrosion performance and mechanical properties. Recommended for most industrial projects. Type 3 (≥60%) — suitable for C3-C4 environments (urban atmosphere, ordinary industrial plants) with general anti-corrosion requirements. Can be selected if the budget is limited and the environmental corrosion level is low. Selection suggestion: When in doubt, choose Type 2 (70%) — the safest universal option.
Zinc powder has a high density (7.14 g/cm³) and tends to settle easily in low-viscosity epoxy resin solutions. Solutions: (1) After opening the container, thoroughly stir with an electric/pneumatic stirrer for ≥5 minutes—completely lift the zinc powder from the bottom until no sediment remains. (2) After adding the hardener, continue stirring for 3-5 minutes until the mixture has a uniform color. (3) Maintain continuous low-speed stirring throughout the application process—a pressure tank with a pneumatic stirrer (rotation speed 30-60 rpm) is recommended to prevent zinc powder from re-settling during spraying, which could cause inconsistent zinc content between the initial and final spray. (4) Paint that has settled and hardened into lumps—do not forcibly stir for use (the zinc powder has separated from the resin and may form lumps, leading to pinholes, uneven zinc distribution, and reduced adhesion after spraying). Paint that has exceeded its mixed pot life and shows gelation—must be discarded. It is recommended to prepare the paint as needed (estimate usage within 2 hours), in small, multiple batches.
Epoxy zinc-rich primer coating exposed to air—surface zinc powder reacts with CO₂ and H₂O to form basic zinc carbonate ("white rust"). After more than 7 days (23°C, 50% RH), the following treatments are required: (1) Visual inspection—white powdery zinc salts must be removed by sweep blasting. Use low-pressure (0.2-0.3 MPa) non-metallic abrasives (garnet/aluminum oxide) for sweep blasting—remove the zinc salt layer and create a 20-30 μm roughness. (2) For coatings within 6 months with no visible zinc salts on the surface—light abrading (manual sanding with 180-240 grit sandpaper) is sufficient. (3) If the coating has extensive chalking/corrosion/peeling—complete abrasive blasting removal and recoating are required. Preventive measures: Apply intermediate paint as close as possible within the minimum recoat interval (8-24 h)—at this stage, the primer surface still has active groups (incompletely crosslinked amine groups), achieving optimal intercoat adhesion without abrading.
Diferencia clave: el formador de película es distinto.Epoxy zinc-rich — organic epoxy resin + polyamide curing agent; inorganic zinc-rich — inorganic ethyl silicate/lithium silicate hydrolysis condensation. Selection comparison: (1) Anti-corrosion performance: Inorganic zinc-rich primer (zinc content ≥85%) offers higher cathodic protection efficiency, certified under NORSOK M-501 and SSPC Paint 20 Type I (inorganic) — Type II (organic). Both can achieve equivalent anti-corrosion grades, but inorganic is slightly superior. (2) Application tolerance: Epoxy zinc-rich >> inorganic zinc-rich. Epoxy can be applied at 5–40°C/RH<85%宽CondicionesApplication；无机对RHRequisitos苛刻——RH需50-90%（Silicato de etilo水解需要水分），Baja temperatura (<5°C）和低湿（<40%）均无法NormalesEndurecimiento——Ventana de aplicación窄。(3)Adherencia entre capas：Epoxi rico en zinc+Capa intermedia epoxi MIO的层间结合力（>5 MPa) is superior to inorganic zinc-rich + epoxy intermediate paint (possibly due to the porous nature of the inorganic coating increasing the contact area, but also potentially leading to insufficient adhesion due to surface chalking—requiring sweep blasting). (4) Cost: Epoxy zinc-rich is approximately 0.7–0.8 times the cost of inorganic zinc-rich. Selection recommendations: For conventional heavy-duty anti-corrosion projects, choose epoxy zinc-rich (easy application + high cost-effectiveness); for extreme marine environments (splash zone/tidal zone) or top-tier projects with a design life of ≥30 years—choose inorganic zinc-rich + sealer + epoxy intermediate coat + polysiloxane topcoat.
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TDS - Ficha técnica del producto

Technical Data Sheet
Conforme a la norma HG/T 3668-2020

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MSDS - Ficha de datos de seguridad de materiales

Material Safety Data Sheet
16 capítulos · GB/T 16483-2008

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Tarjeta de colores del producto

Color Card
Colores estándar gris acero / rojo hierro

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Guía de aplicación

Application Guide
Guía completa de aplicación + Solución de defectos

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Case Studies

proyectoCasos

明石海峡大桥
Japan · 1998

Anticorrosión de los cajones de acero del Puente Akashi Kaikyo, Japón

ClientHonshu-Shikoku Bridge Authority (HSBA)
SustratoCajones de acero de puente, grado Sa3 (metal blanco)
SystemEpoxy zinc-rich primer 80μm + epoxy micaceous iron oxide intermediate paint 150μm + fluorocarbon topcoat 80μm
vida útil de diseño100 años (C5-M corrosión marina muy alta)
AreaAprox. 200.000 m²
SpecificationNorma de pintado HSBA + ISO 12944-5
北海石油平台
North Sea · 2015

Anticorrosión de altas prestaciones para jackets de plataformas petrolíferas offshore del Mar del Norte

ClientEquinor ASA (petróleo estatal noruego)
SustratoEstructura de acero del jacket, grado Sa2.5
SystemEpoxy zinc-rich primer + Epoxy micaceous iron oxide intermediate coat + Polysiloxane topcoat
CertificacionesSistema 1 según NORSOK M-501:2022
AreaAproximadamente 50,000 m²
vida útil de diseño30 años（C5-Mzona de salpicadura）
清奈港岸桥

Anticorrosión de las grúas de muelle para contenedores ZPMC del Puerto de Chennai, India

ClientPSA Chennai / ZPMC
SustratoEstructura de acero de grúa de muelle, grado Sa2.5
SystemWaterborne epoxy zinc-rich primer + epoxy intermediate coat + acrylic topcoat
NormaISO 12944 C5, supera 1500 h QUV
AreaAproximadamente 80,000 m²
vida útil de diseño20 years（C5marino tropical）
海上风电场

Protección anticorrosión de torres eólicas en un parque eólico marino en el Mar del Sur de China

ClientChina Three Gorges New Energy
SustratoTubos de acero de torres eólicas, grado Sa2.5
SystemEpoxy zinc-rich primer 70μm + epoxy micaceous iron oxide 150μm + polyurethane topcoat
NormaISO 12944-5 C5-M
AreaAprox. 30.000 m² (50 aerogeneradores de 6 MW)
vida útil de diseño25 años (C5-M marino)

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