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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