Contaflex GM3
The GM3 range of materials is particularly suited to fast machining in high volumes. That’s because GM3 is a terpolymer, based on high-purity glycerol methacrylate. Resultant lenses are durable, resilient to protein build-up and can be used for a variety of wearing regimens. Contaflex GM3 is available in two water contents: 49% and 58%.
GM3 technical information
Material characteristics
| Property | Contaflex GM3 49% | Contaflex GM3 58% |
|---|---|---|
| Classification | Filcon l 2 | Filcon ll 2 |
| USAN | Acofilcon B | Acofilcon A |
| Oxygen permeability (ISO) @ 35°C gas to gas (barrers) | 15.9 | 25.5 |
| Swell factor @ 20°C | 1.29 | 1.38 |
| Water content by refractometer @ 20°C | 50% | 59% |
| Refractive index @ 20°C dry | 1.522 | 1.523 |
| Refractive index @ 20°C hydrated | 1.416 | 1.402 |
| Light transmission (%) @ 380-780nm | >94% | >95% |
| Hardness (Shore D) | 87 | 88 |
Please note: These are typical values. Always check the certificate of conformity supplied with the goods for the actual values of the batch.
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 3,500rpm 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
- High melt blocking wax
- High melt blocking beeswax
- Kemdent blocking Wax
- Water soluble wax
- Contapol 1 polishing compound
- Contapol 2 polishing compound
- Cotton polishing cloth
- Delrin polishing cup
- Delrin polishing sponge
- Roller sponges
Accessories
- Tweezers
- Glass vials
- Stoppers
- Aluminium top seals
- Flip tear up seals
- Shrink-wrap sleeves
- Double soft lens mailers
- Net vial sleeves
- DMV soft lens remover
- Lens catch mat