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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 to10 µm depending on the initial zinc thickness. | |
| Hot dip galvanized steel | 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 |
MT-Active is suitable for corona electrostatic spraying.
| Recommended film thickness | 60-80 µm A good protection is linked with the recommended film thickness. |
| Recycling | For marine applications, related to cycles approved RINA / DM, the thickness of the metal support must be> = 0.6mm, and the thickness of the coating film must respect the value of 80μ ± 10%. Unused powder can be reclaimed using suitable equipment and recycled through the coating system, but a minimum of 70% new powder should be used. |
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