Powder coating primer MT-Active EL193N

WA：+86 132 6275 2056

WEB: std-coatings.com

Product Overview

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

Environmental & Safety Considerations

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.

Surface & Substrate Compatibility

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).

Application Techniques & Tips

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.

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