Optiguard WET AR surface treatment is a cost effective alternative to the exclusive vacuum deposited Optiguard DRY AR. The performance of WET AR regarding light transmission and reflectance is good.
It has a accurate colour reproduction and is easy to clean, furthermore it has great chemical and abrasion resistance.
It is an excellent choice for a wide range of applications e.g. large window applications like information displays.
WET AR Coating Technical Data
Spectral Properties
Optical Properties
| Type |
% |
| Reflectance |
2 |
| Transmittance |
97 |
Durability
| Properties |
Test Conditions |
Results |
| Adhesion |
Cross Hatch Tape Test |
No coating removal |
| Pencil hardness |
ISO 15184 – BS 3900 – E19 |
4-5H |
| Humidity |
500 h, 60 °C, 95 % RH |
No change |
| Thermal resistance |
500 h, 80 °C |
No change |
| Hot water |
500 h, 60 °C |
No change |
| Cleaning agents |
Methyl and Ethyl Alcohol |
No change |
| Light damage |
Exposure to Xenon Lamp, 500 h |
Pass |
| Salt water resistance |
5 % NaCl spray, 35 °C, 28 days |
Pass |
Spectral, optical and durability specifications are all measured values and not guaranteed.
Additional Chemical Resistance Properties
| Properties |
Test Conditions |
Results |
| Acetone |
Immersion for 1 min @ 22-25 °C and rinsing in distilled water before inspection |
No change |
| H SO – 10 % solution |
No change |
| HCI – 10 % solution |
No change |
Substrate Properties (PMMA)
| Tensile strength (rupture) |
75 MPa |
| Elongation at rupture |
8% |
| Flexural strength (rupture) |
120 MPa |
| Heat stability – Vicat |
100 °C |
| Linear thermal exp. coefficient |
0.07 mm/m °C ¹ |
Quality & Inspection Standard
| Test Condition |
Viewing distance 60 cm, illuminated with 20W fluorescent lamp (@ 40 cm).
Viewing conditions: Black background and ambient luminance < direct surface
luminance. |
| Foreign article, pinhole & bubble |
Diameter (mm) |
Permissible Number (pcs) |
| > 4.0 |
0 |
| > 2.0 – < 4.0 |
1 |
| > 0.5 – < 2.0 |
5 |
| < 0.5 |
Not Rejected |
| Defect diameter represents the core of the defect |
| Burn, Dirt |
Must not be visible under ceiling light |
| Finger Print |
None |
| Reflectance Colour |
Permissible in range between violet and blue violet |
Inspection level for 1200 x 1400 mm sheets
| Calculation of the defect |
Applicable defect: Foreign article, Pinhole, Bubble
Calculation: Average Diameter = (a+b)/2 |
 |
Inspection conditions for 1400 x 1200 mm sheets
