| Quality |
Particle size distribution * |
Optical characteristics |
L / NL |
| |
D10 (µm) |
D50 (µm) |
D90 (µm) |
|
|
| R280/WS/70-30 ** |
45 |
170 |
285 |
coarse/very brilliant |
L |
| O2/WS/70-30 |
28 |
86 |
180 |
coarse/very brilliant |
L |
| O4/WS/70-30 |
23 |
76 |
165 |
coarse/very brilliant |
L |
| O6/WS/70-30 |
16 |
58 |
130 |
coarse/very brilliant |
L |
| 08/WS/70-30 |
13 |
45 |
105 |
coarse/very brilliant |
L |
| 880/WS/70-30 |
9 |
32 |
76 |
fine/brilliant |
L |
| 8880/WS/70-30 |
6 |
21 |
55 |
fine/brilliant |
L |
| 8980/WS/70-30 |
4 |
14 |
42 |
fine/brilliant |
L |
| 70000/2/NL/WS/70-30 |
5 |
15 |
38 |
fine/ |
NL |
| 80000A/WS/70-30 |
2 |
7 |
19 |
very fine/high coverage |
L |
| 90000A/WS/70-30 |
2 |
5,5 |
16 |
very fine/high coverage |
L |
* Values of particle size distribution are based on powder analysis.
| ** e.g. :R280/WS/70-30 |
R280: |
Pigment quality |
| |
WS : (White spirit) (1) |
Solvent Type |
| |
70: |
70% solids |
| |
30: |
30% liquids |
(1): Also available in SA : solvent naphta & BG: butylglycol
*L/NL Note
Leafing grades are used for applications requiring maximum metallic brilliance and reflection.
Non-leafing grades typically are to remain inside the film application and will provide a lower metallic brilliance, reflection.
Indicative Formulation
Aluminium: 5 - 10%
Binder: 90 - 95%
Suggestion
Suggested binder: paraloid B66 acrylic binder (Rohm&Haas) in butylacetate ratio 30/70.
How to Use
1/ Mix a small quantity of solvent to the aluminium paste to obtain a homogeneous pre-dispersion.
2/ Add pre-dispersion gradually to binder using a slow rotation mixer (50 rpm)
3/ Spray formulation at 20 seconds Zahn 2 or Ford 4.
Notes
The combination of fine and coarse aluminium grades (ratio 80-20) will provide a sparkle effect.
The diameter of the spray nozzle should be at least three times larger than the dimension of the largest particles.
Evaluation of Stability
For aerosol paints
The stability of the formulation is normally tested at 50°C (in an oven) for the period of minimum one month.