Surface Finish Options Overview
Product Description
Pure epoxy primer powder MT Plus -AL117N is a powder primer protective barrier designed to give enhanced corrosion protection of mild steel, hot dip galvanized steel and Zinc sprayed (gas flame/electrical deposition) and Aluminium. MT Plus is a pure epoxy primer showing a high cross-linking degree reinforced with barrier effect agents to provide the best barrier protection.
Pure epoxy primer powder MT Plus -AL117N must be over-coated with our powders or a Cromadex / Inernational PU liquid topcoat. It could be used as holding primer with a maximum waiting delay of 3 weeks.
Key benefits:
Wide curing range, good mechanical properties, excellent edge coverage, good anti gassing properties, good over coating capacity.
Powder Properties
| Chemical type | Thermosetting epoxy |
| Appearance | Smooth |
| Gloss level(60°) | Aspect may vary depending on curing conditions (green cure) |
| Color | Grey |
| Recommended Film Thickness (µm) | 60 – 80 µm |
| Density (g/cm3) | 1.5 ± 0.03 g/cm³ |
| Application | Electrostatic |
| Storage | Under dry, cool (≤ 30°C) conditions |
| Shelf life | At least 12 months from production date |
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 | Sweeping with a maximum zinc layer thickness reduction of 5 to Degreasing & phosphating (or equivalent) followed by passivation, DW rinsing and drying. Hot dip galvanized steel Degreasing & phosphating / chromating followed by passivation. 10 µm depending on the initial zinc thickness. | |
| Hot dip galvanized steel | Degreasing & phosphating / chromating followed by passivation. | |
| Aluminium | Sweeping | Follow QUALICOAT (16th edition) recommendations for pre-treatment methods. |
| Zinc sprayed (gas 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 |
Application
MT Plus is suitable for corona electrostatic spraying.
| Recommended film thickness | 60-80 µm A good protection is linked with the recommended film thickness. |
| Recycling | Unused powder can be reclaimed using suitable equipment and recycled through the coating system, but a minimum of 70% new powder should be used. |
