Polyester based powder coatings MT-620 AM
Product Description
MT-620 AM is a series of polyester based powder coatings, formulated without the use of TGIC, designed for the exterior environment, offering the benefits of MT 600 in combination with specific antimicrobial activity. MT-620 AM powders are available in a wide range of colors in gloss, satin, matt, metallic and textured effects and can be custom matched to the user’s requirements.
Powder properties
| Typical value | |
| Chemical Type | Polyester – TGIC Free |
| Density | 1.2 – 1.9 g/cm³, depending on colour and effect |
| Application | Suitable for electrostatic spray |
| Shelf life | 24 months below 30 °C
12 months below 35 °C |
| Storage Conditions | Under dry, cool (≤ 30°C) conditions
(open boxes must be resealed) |
| Curing schedule | 30-40 min at 170°C
10-20 min at 180°C 8-16 min at 200°C (at object temperature) |
Test conditions
The results shown below are based on mechanical and chemical tests which (unless otherwise indicated) have been carried out under laboratory conditions and are given for guidance only. Actual product performance will depend upon the circumstances under which the product is used.
| Pre-treatment | Gold Seal lightweight Zinc Phosphate |
| Substrate | Gold Seal polished 0.5mm steel |
| Curing schedule
(Object Temperature) |
10 minutes at 200°C |
| Film Thickness | 50 microns |
Mechanical tests
| Adhesion | ISO 2409 (2mm crosshatch) | Gt 0 |
| Erichsen cupping | ISO 1520 | ≥ 7 mm |
| Flexibility | ISO 1519 | Pass 5mm |
| Hardness | Pass – no penetration to substrate | ISO 1518-1 (2000g) |
| Impact | ISO 6272 | > 50 kg·cm direct |
Pretreatment
Aluminium, steel or Zintec surfaces to be coated must be clean and free from grease. Iron phosphate and particularly lightweight zinc phosphating of ferrous metals improves corrosion resistance. Aluminium substrates may require a chromate conversion coating. Detailed advice should be sought from the pre-treatment supplier.
Application
MT-620 AM powder coatings can be applied by corona electrostatic equipment. In all application processes the aspect obtained is subject to variation, depending on the method of application (type of gun, nozzle, etc) and the shape/type of component. We recommend that the actual application parameters are adapted and adjusted depending on the type of component and with each powder batch to give a finish in accordance with our color card. The following procedure is given as a guideline when using these finishes. We recommend the use of flat jet spray nozzles. To ensure powder homogeneity, the complete content of the boxes should be emptied completely into the feed hopper. For manual application it is essential to ensure that an even film thickness is applied, and, in all Instances, sinusoidal gun movements should be avoided. All powders can show small color differences from batch to batch, this is normal and unavoidable. Applicators and fabricators are advised to use a single batch for parts that will be assembled together. Differences are more likely with special effect powders. Bonded products have better application properties than blended products (more stable) but attention should still be paid to line settings to avoid “marble effect” and changes in aspect after recycling. Different substrates (Aluminium, steel, galvanized steel, etc.), use of primer, and big changes in film thickness may give a different aspect. Products with different codes should not be mixed even if same color and gloss.
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