Contaflex (FDA)

Soft lens materials with water contents from 38% to 55% that exhibit zero stress and excellent machinability. The Contaflex range of FDA-approved soft contact lens materials employs a novel polymerisation technique combined with the highest purity polymers.

Each product within the range has its own benefits: lower water content materials have greater lens stability, higher tensile strength, and suit daily wear applications; mid-water content materials offer a greater Dk, which leads to greater on-eye comfort and excellent clarity of vision.

Contaflex (FDA) 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

PropertyPolymacon 38%Methafilcon 55%
Classification Filcon l 1Filcon IV 2
Oxygen permeability (ISO) @ 35°C (barrers) 7.919.5
Swell factor @ 20°C1.201.35
Water content by refractometer @ 20°C38%55%
Refractive index @ 20°C dry1.511.51
Refractive index @ 20°C hydrated1.4381.407
Light transmission (%) @380-780nm>96%>94.8%
Hardness (Shore D)8888

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 3500rpm and minimal weight. With the above machining recommendations polishing should require a maximum of 30 seconds.


Hydration of the Polymacon and Hefilcon materials is best performed in buffered saline with a PH of 6.8-7.5. To ensure complete hydration of lenses manufactured from our methafilcon material, a two-step hydration process is required:

Step 1: Place the dry finished lenses in a pH 8.2 isotonic saline solution for a minimum of 15 hours, in a controlled environment at 20°C +/- 2°C. Carbonate buffered saline pH 8.2 (1 litre) NaC1 (sodium chloride) 8.00 grams NaHCO3 (sodium bicarbonate) 1.50 grams

Step 2: Place the hydrated lenses into a pH 7.2 isotonic saline solution and store the lenses for at least 2 hours. The lenses will now be fully hydrated and ready for final parameter measurement. Borate buffered saline pH 7.2 (1 litre) NaCI (sodium chloride) 8.00 grams H3BO3 (boric acid) 2.47 grams Na2B4O7. 10H2O (sodium tetraborate decahydrate) 0.14 grams

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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