UV Resistance
The UV resistance of the Gentoo treatment was determined in accordance with ASTM D4329. During the testing, a UVB-313 lamp with 0.63W/m2 irradiance was used. The QUV test cycle was comprised of a 7 hour period of UV exposure at 50°C followed by a 5 hour period at 50°C with a 100% relative humidity condensation cycle. The QUV test cycle was repeated for 4 weeks.
Table 4 shows the results of the QUV testing. Visually, it is evident that QUV exposure did not have a significant effect on the properties of the Gentoo, as no evidence of degradation, delamination, discoloration, etc. was observed.
In general, the contact angle of the coating decreased by 7% after 4 weeks QUV exposure. The transparency and clarity of the control and Gentoo treatment remained relatively constant throughout the test. Haze increased for all the coatings throughout the test, though the haze remained under 1.65%, which is well under the visual limit in which coatings no longer appear transparent.
Test Method | 0 Weeks | 4 Weeks |
|---|---|---|
Contact Angle (°) | 1122 | 104 |
Transparency (%) | 92.5 | 91.7 |
Haze (%) | 0.78 | 1.64 |
Clarity (%) | 99.8 | 99.7 |
For the purposes of this report, Gentoo has been applied by flow, spray, or dip coating onto selected substrates – glass, polycarbonate, acrylic, silicone, Nitronic 50 stainless steel (UNS S20910), 2024-T3 (UNS A92024) and 7075-T6 (UNS A97075) aluminum alloys, anodized 7075-T6 aluminum, Alodine and other non-chromate surface modification treatments and 316 stainless steel (UNS S31600) screws and washers.
Treated substrates were air cured at ambient temperature or cured at 90°C for 15-60 minutes, depending on the application requirements. Coating thickness was measured at 4-6 μm depending on substrate and application method. Three specimens were used for each test and the data was averaged.
Test Method | Control | Gentoo |
|---|---|---|
QUV Exposure Time (hours) | 500 | 500 |
QUV Exposure Time (hours) | -0.6 | -0.8 |
Δa* | 0.2 | 0.1 |
Δb* | -1 | -0.5 |
ΔE | 1.2 | 0.9 |
Initial Gloss | 91.6 | 88.7 |
Δ Gloss | -8.9 | -1.1 |
Gentoo Documentation |
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Safety Data Sheets |
Frequently Asked Questions |
Application Guide |
Mixing Instructions |
Technical Data Sheets |
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Download Test Data |