Oxygen is classified as one of the potentially corrosive factors, as same as moisture and UV rays.This data shows that O2 permeation coefficient of LUMIFLON® did not change after 5000 hours of exposure.
LUMIFLON® based film is expected to protect under coat from O2 permeation, therefore LUMIFLON® will act as topcoat for heavy duty coating systems to maintain good appearance and the anti-corrosive properties.
|
| Film system |
O2 gas permeability
(cc·cm / cm2·sec·cmHg) |
| |
Sunshine Weatherometer
0 → 5000 (hrs) |
| LUMIFLON® |
4.2×10-11 |
3.5×10-11 |
| Acrylic urethane |
2.6×10-10 |
Torn after 2000hrs |
|
 |
An impedance measuring method can be used to predict the durability of each system.The change in impedance is plotted against exposre time and a straight line graph is obtained. The angle this line makes from the vertical, θ, is obtained. High θ values indicate good corrosion resistance. The θ value for each system is shown in the table at below.
|
| System |
tanθ |
Life span |
| LUMIFLON® |
5.7 |
12-23yrs |
| Acrylic urethane |
2.6 |
6-10yrs |
| Chlorinated rubber |
1.8 |
4.5-7.5yrs |
| Alkyd |
1.3 |
3-5yrs |
|
|
This data shows that life of LUMIFLON® film is about twice as long as that of acrylic urethane. |
|
 |
| |
General environment |
Severe environment |
*Not salty
*No effect from exhaust gass or factory smog |
*Very salty
*Severly polluted by exhaust gass or factory smog |
| General coating |
10 years |
Not applicable |
| Heavy duty coating |
Polyurethane coating |
30 years |
20 years |
Fluoropolymer coating
(LUMIFLON®) |
50 years |
30 years |
|
|
| Japanese Society of Steel Construction. 2002. Toward LCC reduction |
| |
of bridge coating: Comparison of bridge corrosion prevention method. |
| |
October, 22. |
|
|
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