barrier-free version
Daicure SD-661 and SD-645 are qualified, approved and used by many major DVD manufacturers in the world for the application of DVD-5, 10 and DVD-9 with Gold or Silicon semi-reflective layers.
Water droplets phenomenon
It is known that water droplets are generated in between gold semi-reflective layer and polycarbonate after cooling down the disc from chamber conditions (e.g. 80°C, 80%RH, 96 hrs.).
SD-661 and SD-645 are designed to prevent this phenomenon.
These pictures show water droplets that are generated in between Au and PC:
Technical Information
| SD-661 | SD-645 | |||
| before curing: | ||||
|
Viscosity: Surface Tension: Reflective Index: |
590 mPa.s 38 mN/m 1,50 n D25 |
520 mPa.s 38 mN/m 1,50 n D25 |
||
| after curing: | ||||
|
Tg Modulus 30°C 50°C 75°C 100°C Shrinkage on curing |
10°C 2 MPa 4 MPa 6 MPa 6 MPa 6,7% |
19°C 12 MPa 8 MPa 9 MPa 9 MPa 6,9% |