The MR ??Series are the urethane?material made by Mitsui Chemical from Japan. It provides both exceptional optical performance and durability, resulting in ophthalmic lenses that are thinner, lighter and stronger. Lenses made of the MR materials are with minimal chromatic aberration and clear vision.
Comparison of Physical Properties
| MR??Series |
Others |
|||||
| MR-8 | MR-7 | MR-174 | Poly carbonate | Acrylic?(RI:1.60) | Middle?Index | |
| Refractive?Index(ne) |
1.6 |
1.67 |
1.74 | 1.59 |
1.6 |
1.55 |
| Abbe?Number(ve) |
41 |
31 |
32 |
28-30 |
32 |
34-36 |
| Heat Distortion Temp. (oC) |
118 |
85 |
78 |
142-148 | 88-89 |
- |
| Tintability | Excellent | Good |
OK |
None | Good | Good |
| Impact?Resistance | Good | Good |
OK |
Good |
OK |
OK |
| Static?Load?Resistance | Good | Good |
OK |
Good | Poor |
Poor |
R.I. 1.60: MR-8 TMThe best balanced high index lens material with the largest share of the?R.I. 1.60 lens material market. MR-8 is suited to any strength ophthalmic lens and is new?standard in ophthalmic lens material.
R.I. 1.67: MR-7 TMGlobal standard R.I. 1.67 lens material. Great material for thinner lenses with strong impact resistance.
R.I. 1.74: MR-174 TMUltra high index lens material for ultra thin lenses. Strong prescription lens wearers are now free from thick and heavy lenses.
Features
High Refractive Index for thinner & lighter lenses
Superb Optical Quality?for eye comfort(high Abbe value & minimal stress strain)
Mechanical Strength for eye safety
Durability for long-term usage(Minimal yellowing)
Processability for precise sophisticated design
Ideal for Various Lens Applications?(color lens, rimless frame, high curve lens, polarized lens, photochromic lens, etc.)
