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Hydrophilic
Nature: Terpolymer based on glycerol methacrylate
The GM3 range of materials is available in two water contents 49% and 58%, based on high purity glycerol methacrylate, these materials are remarkably easy to machine. Resultant lenses are extremely durable, resilient to protein build up and can be used for a variety of wearing regimens.
For further information on the GM3 range please email sales@contamac.com
GM3 technical information
Material Characteristics:
| Property | Contaflex GM3 49% | Contaflex GM3 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 | 1.38 at 20°C |
| Water Content | 50% at 20°C by refractometer
48% at 20°C by weight | 59% at 20°C by refractometer
57.5% at 20°C by weight |
| Refractive Index | 1.522 Dry
1.416 Hydrated | 1.523 Dry
1.402 Hydrated |
| Light Transmission | >94.9% | >93.4% |
| 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)] | 15.9 | 25.5 |
| Tensile Strength | 0.6MPa | 0.4MPa |
| Elongation to break | 212% | 196% |
| Shore D hardness | 87 | 88 |
| Handling tints | Blue | Blue |
| 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 | 7,000 | 0.50 – 0.7mm | 0.05mm |
| CNC | 7,000 | 0.50 – 0.7mm | 0.05mm |
| Air Bearing | 10,000 | 0.50 – 0.7mm | 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 GM3 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