Powder coating primer
Product Description
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.
Powder Properties
| 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 |
Mechanical Tests
| 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) |
Pretreatment
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 |
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