Viz Bond Optical Bonding
Overview
Using our background of over 25 years in display enhancement and other display bonding options Optical Filters has developed Viz-Bond®, a wet bonding system that cures to a gel, to deliver a cost effective, scalable system in which the components are processed at ambient temperature without the use of vacuum, temperature, pressure and need for multiple tooling.
Viz-Bond® cures within the wave length range of 390-500nm and can therefore cure through a polarizer and materials containing UV inhibitors. The system can also cure behind edge masks up to a width of ≥20mm (3/4").
Environmental performance
| Temperature | Stable under multiple ESS cycles between -550C to +950C with ramp rates of 3-50C/min and dwell times at extremes of 30 minutes (minimum) |
| Humidity | No change after exposure to 95% R.H. at 700C for a minimum of 50 hours |
| UV/solar exposure | Fill adhesive and sealing gasket are stable and show minimal changes in transmission and l.a.b. values following extensive simulated UV/solar exposure. Testing to MIL-STD-810G Method 505.5 Procedure II for quantification is ongoing in our certified solar chamber. |
| Chemical Resistance | Stable when in contact with most silicone, polyurethane and polysulphide adhesive sealants. Viz-Bond® will be attacked when in contact with adhesive sealants with solvent systems including MEK, acetone, toluene or similar materials. |
Mechanical performance
| Impact resistance. | Enhances laminate performance to exceed the boot impact MIL-STD - 3122 and the Wrench Impact Ball drop test (1" diameter steel ball dropped from 20-25" - 6 impacts) |
| Shock absorption | Viz-Bond® laminates of un-tempered float glass absorb 8+ times the energy of a standard dry film laminate before failure |
| Vibration tolerance | In accordance with MIL-STD-810F-514.5 |
| Adhesion - Sheer | No failure of a bond to a 10.4" display with a 1000gm weight suspended vertically at 850C for 8 hours and >1000 hours at ambient |
| Bond thickness |
Minimum 0.7 +/-0.1mm measured from the surface of the display bezel to the rear surface of the display enhancement stack Typical 0.7 +0.3/-0.1mm bond thickness between the display surface depending on the LCD bezel |
Material properties
| Material type | Low viscosity, UV-visible curing proprietary Alkyl Urethane |
| Optical |
Photopic transmission (Pt) ; >98.5% (typical 99.0%) # measured between 2 layers of anti-reflective glassSpecular Reflectance @ 300 (Sr); <0.05% Diffuse Reflectance @ 300 (Dr); <0.05% Refractive Index; 1.51 ±0.02 |
| Cure range | 390-500nm |
| Cure time | < 3 minutes with exposure to 3-5milliwatts/sq cm at ambient temperatures |
| Viscosity (uncured) | <50 cps (Allows Viz-Bond® to be pumped into a fill cavity high rates with low pressure) |
| Material uniformity | A chemical fingerprint of each batch is obtained using FTIR spectrophotometer. All batches must fall within the specified finger print with a tolerance of +/-2% |
| Hardness / Softness | <15 Durometer scale A) |
| Elasticity | Young's modulus <180KPa |
| Shrinkage | < 5 % by volume |
PSS-3000
Performance Films
Optical Bonding