MT-Active is a powder coating primer, totally free from Zinc. It is designed to give enhanced corrosion protection of mild steel and is an epoxy-polyester primer including active anticorrosive pigments. The addition of these pigments provides a steel passivation effect to protect the substrate enhancing the performance when compared to other non-active systems.
| Chemical type | Thermosetting epoxy-polyester |
| Appearance | Smooth |
| Gloss level (60°) | 50-60 units |
| Color | Grey |
| Recommended Film Thickness (µm) | 60 - 80 µm |
| Density (g/cm3) | 1.65 - 1.70 g/cm³ |
| Application | Electrostatic |
| Storage | Under dry, cool (≤ 30°C) conditions |
| Shelf life | At least 12 months from production date |
| Flexibility (Cylindrical Mandrel) | ASTM D522-93A |
Pass 3 mm (Primer) Pass 10 mm (System) |
| Adhesion | ASTM D3359-97 (2mm crosshatch) |
Class 0 (Primer) Class 0 (System) |
| Erichsen Cupping | ASTM 643-84 |
Pass 5 mm (Primer) Pass 4 mm (System) |
| Impact | ASTM D2794 |
Pass 0.4 kg·m (Primer) Pass 0.3 kg·m (System) |
Surface preparation depends upon the metal, the type of surface, its conditions and the required performance.
| Substrate | Mechanical pretreatment | Chemical pretreatment |
| Mild steel | Grit Blasting Sa 2.5 in accordance with ISO NF EN 8501-1. Roughness: Rz 42 84 µm / Ra 6-12 µm | Degreasing & phosphating (or equivalent) followed by passivation, DW rinsing and drying. |
| Cast steel | ||
| Electro Zinc steel | Sweep blasting with a maximum zinc layer thickness reduction of 5 to 10 µm depending on the initial zinc thickness | |
| Hot dip galvanized stee | Degreasing & phosphating / chromating followed by passivation. | |
| flame/electrical deposition) | Grit Blasting Sa 3 in accordance with ISO NF EN 8501-1. Roughness: Rz 42 84 µm / Ra 6-12 µm | Banned |
Solvent-Free: As a powder coating primer, MT-PZ ALZ44TH contains no solvents, reducing VOC emissions and making it environmentally friendly.
Safe Handling: Wear standard protective equipment (gloves, mask, goggles) when handling powders. Avoid inhalation of dust.
Disposal Guidelines: Unused powder should be recycled or disposed of according to local regulations; do not discharge into waterways.
Performance & Durability Metrics
Corrosion Resistance: Provides cathodic and barrier protection; effective for C3–C4 corrosion categories under ISO 12944 standards when properly over-coated.
Scratch & Mechanical Resistance: Active anticorrosive pigments maintain protection even if the primer is scratched or damaged during handling.
Adhesion: Excellent adhesion to blasted mild steel ensures minimal delamination or flaking over long-term use.
Chemical Resistance: Resistant to mild acids, bases, and industrial pollutants before over-coating; topcoat provides additional protection for aggressive chemicals.
Ideal Substrates: Blasted mild steel; recommended for industrial structures, machinery, pipelines, and steel frameworks.
Not Recommended: Cast steel, electro-galvanized steel, hot-dip galvanized steel, or zinc-sprayed surfaces unless otherwise specified.
Substrate Preparation Tips: Ensure surfaces are free from oil, grease, rust, and contamination. Use grit blasting to achieve specified roughness (Rz 35–60 µm / Ra 6–12 µm).
Spraying Best Practices: Maintain uniform electrostatic voltage (65–70 kV) and adjust fluidizing/transport air pressure for even coverage.
Film Thickness Control: Over-thick application can lead to incomplete curing; under-thick may reduce corrosion protection.
Over-Coating: Topcoat should be applied after primer curing. Light surface activation may be necessary if the primer surface has aged beyond recommended over-coating window.
Recycling: Combine with at least 70% new powder when reusing; clean spray equipment every 30 minutes to prevent clogging and uneven deposition.
Industrial: Machinery frames, equipment enclosures, pipelines, structural steel supports.
Construction: Steel frameworks, warehouse racking, bridge components.
Automotive & Transport: Chassis, industrial vehicle parts, protective steel panels.
Architectural: Steel elements in building facades, railings, and metal fences (must be top-coated for outdoor UV exposure).
Over Conventional Epoxy Primers: MT-PZ ALZ44TH provides both cathodic protection and barrier protection, whereas standard primers only provide barrier effect.
Over Zinc-Free Epoxy Primers: The presence of zinc particles ensures protection even if the primer layer is scratched during transport or assembly.
Flexibility in Multi-Layer Systems: Compatible with polyester and PU topcoats for duplex coating systems, enhancing long-term corrosion protection.
Can MT-PZ ALZ44TH be applied outdoors directly?
No, it must be over-coated with a suitable topcoat to resist UV exposure and environmental degradation.
What is the optimal curing range?
Primer should be cured or at least gelled between 110–180°C. Exceeding this range can compromise crosslinking and performance.
Is the primer safe for food-contact surfaces?
MT-PZ is intended for industrial and structural applications, not for direct food contact.
Can it be used in automated powder coating lines?
Yes, it is optimized for corona electrostatic application; Tribo systems are not recommended.
How long can the primer wait before topcoating?
Ideally within 3 weeks under clean, dry indoor storage. Beyond that, light surface activation may be required.
Powder coatings can be categorized by resin system (epoxy, polyester, hybrid, polyurethane), appearance (smooth, texture, hammer, metallic, pearlescent), or performance level (anti-corrosion, heat-resistant, UV-resistant, architectural grade, automotive grade).
Powder coatings offer thousands of colors in gloss, matte, satin, metallic, candy, texture, wrinkle, hammer tone, wood grain, fluorescent, and other custom effects. Special powders can create soft-touch, anti-scratch, anti-fingerprint, or anti-graffiti surfaces.
The process generally includes surface pretreatment (degreasing, phosphating, chromating, sandblasting), drying, electrostatic spraying, curing in an oven, and cooling. A well-controlled pretreatment and curing process ensures strong adhesion and long service life.
Powder coatings are environmentally friendly, solvent-free, and produce minimal waste. They offer excellent corrosion resistance, weather durability, mechanical strength, and uniform film appearance. The coating is tough, impact-resistant, scratch-resistant, and has a long lifespan.
Powder coatings are widely used in appliances, aluminum profiles, architectural components, automotive parts, bicycles, furniture, outdoor equipment, machinery, electrical cabinets, pipeline systems, and general industrial and consumer goods.
Powder coating is a dry finishing technology where finely ground powder is electrostatically sprayed onto a metal or non-metal surface and then cured at high temperature. After curing, the powder melts into a continuous, durable, and decorative coating layer.
Powder coating protects the substrate from corrosion, weathering, chemical attack, and mechanical wear. It also provides decorative appearance with rich colors, gloss levels, textures, and special effects.
In many industrial applications, powder coating outperforms liquid paint. It forms a thicker and tougher coating, resists corrosion and chemicals better, and does not contain VOCs. It also provides excellent consistency and cost-effective mass production.
It is called powder coating because the coating material is a solid powder instead of a liquid paint. The coating is formed by melting and curing powder particles under heat.
Powder coatings include several families depending on resin chemistry:
• Epoxy powders
• Polyester powders
• Epoxy-polyester hybrid powders
• Polyurethane powders
• Acrylic powders
• Fluorocarbon (PVDF) powders
Each type has its own performance features such as corrosion resistance, UV resistance, chemical resistance, outdoor durability, or decorative properties.
Powder coatings are based on thermoset or thermoplastic resins combined with pigments, curing agents, fillers, additives, and in some cases metallic or effect particles. Common substrates include steel, aluminum, galvanized metal, MDF, and certain heat-resistant plastics.
The lifespan depends on powder type, film thickness, application method, pretreatment, and service environment. Indoor coatings can last more than 10–20 years. High-grade outdoor polyester or fluorocarbon powders can last 15–25 years or longer under UV exposure.
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