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Hydrophilic
Employing a novel polymerisation technique together with using the highest purity monomers produces the Contaflex range of soft contact lens materials. This results in a range of soft lens materials with water contents from 58% to 75% that exhibit zero stress and excellent machinability.
The mid to high water content materials offer a greater Dk that leads to more comfortable wearing characteristics and excellent clarity of vision. Owing to the level of water content in the 75% materials this offers opportunities in bandage and other therapeutic lens applications
For further information on Contaflex please email sales@contamac.com
Contaflex technical information
Material Characteristics:
| Property | Contaflex 58% | Contaflex 67% | Contaflex 75% |
|---|
| Ionic or non-ionic | Non-Ionic | Non-Ionic | Non-Ionic |
| Swell Factor | 1.37 at 20°C | 1.49 at 20°C | 1.61 at 20°C |
Water Content
refractometer | 58% at 20°C by
refractometer | 67% at 20°C by
refractometer | 74.5% at 20°C by
refractometer |
| Refractive Index | 1.54 Dry
1.40 Hydrated | 1.55 Dry
1.39 Hydrated | 1.56 Dry
1.375 Hydrated |
| Light Transmission | >94% | >95% | >95% |
| Density | 1.18g/cm3 Dry
1.11g/cm3 Hydrated | 1.18g/cm3 Dry
1.07g/cm3 Hydrated | 1.19g/cm3 Dry
1.05g/cm3 Hydrated |
Oxygen Permeability (ISO)
x10-11(cm2/sec)
[mlO2/(ml x mmHg)] | 21 | 30 | 43 |
| Tensile Strength | 0.48MPa | 0.36MPa | 0.17MPa |
| Elongation to break | 150% | 130% | 170% |
| Handling tints | Blue | None | None |
| UV blocker | On request | On request | On request |
| Diameter | 12.70mm | 12.70mm | 12.70mm |
| Thickness | 5.00mm | 5.00mm | 5.00mm |
Please note: These are typical values. Always check the certificate of compliance supplied with the goods for the actual values of the batch.
Please note: Other materials may be available on request.
Diamond Tooling:
| Tooling | Radius (mm) |
|---|
| Rough | 0.30 – 0.50mm |
| Fine | 0.30 – 0.50mm |
Machining Recommendations:
| Lathe type | RPM | Bulk cut | Fine Cut |
|---|
| Manual | 6,000 – 9,000 | 0.30 – 0.50mm | 0.05mm |
| CNC | 6,500 – 9,000 | 0.30 – 0.50mm | 0.05mm |
| Air Bearing | 6,000 – 9,000 | 0.50mm | 0.03 – 0.05mm |
Environment Control
For best manufacturing conditions Contamac recommends 19-23°C with a relative humidity of 45% - 60%
Polishing
The recommended polishing compound is Contapol 2 with a spindle speed of 3,500 rpm and weight of 240gms. With the above machining recommendations polishing should require a maximum of 30 seconds.
Hydration
Hydration of these materials is best performed in buffered saline with a PH of 6.8 – 7.5.
Manufacturing Consumables
- Contapol 2 polishing Compound
- C-15 White Blocking Wax
- Kemdent Blocking Wax
- C-18B White Brushed Cotton
- C-18C Beige Microfibre Cloth
Accessories
- Glass Vials
- Silicone Bungs
- Flip Tear Crimp Top Seals
- Horseshoe Crimp Top Seals
- Steel Hand Crimper
- Plastic Tweezers
- Shrink Wrap Sleeves