Aluminium powder for Powder Coatings - detailed information 
| quality |
Water-covering capacity |
Particle size distribution |
Apparent density |
Optical characteristics |
Leafing/Non Leafing |
| |
(cm²/g)
|
D10
|
D50
|
D90
|
(g/cm³)
|
|
|
| 8880 |
15000 |
6 |
21 |
55 |
0,23 |
fine/brilliant |
L |
| 8980 |
22000 |
4 |
14 |
40 |
0,23 |
fine/brilliant |
L |
| 70000/2/NL |
_ |
5 |
15 |
38 |
0,21 |
fine |
NL |
| 80000/A |
35000 |
2 |
7 |
20 |
0,23 |
very fine/high coverage |
L |
| 90000/A |
>35000 |
2 |
5,5 |
16 |
0,23 |
|
L |
Indicative Formulations
Pigment: 2 -5%
Binder: 98 - 95% (epoxy / polyurethane)
General Information
There are three processes used for the powder coating application.
1. Free blending process
This process involves the free mixing of the pigment with binder prior to electrostatic spraying the blend onto the substrate to be coated. This process is the most suitable for the use of standard pigments. Since it does not involve any extrusion, standard pigments will retain an optimal metallic shine.
2. Extrusion process
In this process, pigment and binder are extruded together and then grounded to fine particles prior to being electrostatic sprayed. The extrusion process damages considerably the metallic pigments because of the share forces existed. As a result, a lower metallic shine is obtained.
3. Bonded process
Pigment and binder are slowly heated up until they "stick" together. This process involves less waste than the free blending process at the time of application. But the bonded product, which can only be prepared by specialised firms, is costly.