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Hydrophilic
Contamac's range of Hydrophilic contact lens materials are uniquely manufactured, using highly purified monomers to provide the finest materials, which ensure your finished contact lenses result in the ultimate "on eye" wearing experience.
GM Advance is the latest in soft lens material innovation; Building on the chemistry of the GM3, this material has been developed to provide the ultimate on eye wearing experience. Utilizing the highest purity monomers, a careful blend results in a material that exhibits exceptional on eye stability, water retention and durability. This exceptional combination of properties ensures that manufacturers yields are high and lens returns remain low, due to high patient satisfaction and low levels of lens breakage.
For further information on GM Advance please email sales@contamac.com
GM Advance technical information
Material Characteristics:
| Property | Contaflex GM Advance 49% | Contaflex GM Advance 58% |
|---|
| Classification – (ISO 18369-1:2009) | Filcon l 2 | Filcon ll 2 |
| FDA Approved | Yes | Yes |
| USAN | Acofilcon B | Acofilcon A |
| Ionic or non-ionic | Non-Ionic | Non-Ionic |
| Swell Factor | 1.29 at 20°C | 1.36 at 20°C |
| Water Content | 50% at 20°C by refractometer
49% at 20°C by weight | 60% at 20°C by refractometer
59% at 20°C by weight |
| Refractive Index | 1.417 at 20°C
1.419 at 35°C | 1.400 at 20°C
1.403 at 35°C |
| Dry Refractive Index | 1.510 at 20°C | 1.510 at 20°C |
| Light Transmission | >94% | >94% |
| Density | 1.226g/cm3 Dry
1.142g/cm3 Hydrated | 1.222g/cm3 Dry
1.103g/cm3 Hydrated |
Oxygen Permeability (ISO)
x10-11(cm2/sec)
[mlO2/(ml x mmHg)] | 16 | 26 |
| Tensile Strength | 0.35MPa | 0.14MPa |
| Elongation to break | 210% | 140% |
| Modulus | 0.36MPa | 0.16MPa |
| Hardness (Shore D) | 86 | 83 |
| UV blocker | On request | On request |
| Diameter | 12.70mm | 12.70mm |
| Thickness | 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.
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 | 8-10,000 | 0.50mm | 0.05mm |
| CNC | 8-10,000 | 0.50mm | 0.05mm |
| Air Bearing | 10,000 | 0.50mm | 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 GM3 Advance materials is best performed in buffered saline with a PH of 6.8 – 7.3.
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