GM Advance

GM Advance is an evolutionary advance on the physical and chemical properties of GMA-based soft lens materials. Its refined blend of purified monomers helps achieve high manufacturing yields, while its exceptional on-eye stability, water retention and durability guarantees patient satisfaction and low lens breakage levels.

  • Lower modulus, higher tensile strength and higher elongation-to-break than other GMA based materials
  • Unique material blends ensure superior lens surfaces and edges
  • More dimensionally-stable than other GMA-based and soft lens materials
  • Resists dehydration longer and rehydrates faster than comparable materials
  • Dehydration comparable to Polymacon, and better than VP/PMMA-based materials
  • Available in 49% and 58% water contents


GM Advance technical information

Please Note: Regulatory requirements and standards vary from country to country, and are constantly evolving. As a global company, we want to be sure we provide you with detailed technical information, specific to your market, where appropriate, rather than using the condensed and simplified technical information on the website. If you need to use technical data for quality paperwork, or for a regulatory submission, please contact your account manager to obtain this precise and detailed information to support your regulatory requirements, we will be happy to help. 

Material Characteristics 

PropertyContaflex GM Advance 49%Contaflex GM Advance 58%
Classification Filcon l 2Filcon ll 2
USANAcofilcon BAcofilcon A
Oxygen permeability (ISO) @ 35°C gas to gas (barrers)1626
Swell factor @ 20°C1.281.36
Water content by refractometer @ 20°C50% 60%
Refractive index @ 20°C dry1.5151.515
Refractive index @ 20°C hydrated1.4171.400
Light transmission (%) @ 380-780nm>94%>94%
Hardness (Shore D)8683

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%


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 of GM3 Advance 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


  • 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


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