Contamac developed the Definitive silicone hydrogel material range, with its advanced polymer matrix that uses the very latest technology, as the benchmark for a new generation of lathe-cut materials. Its unique surface qualities, outstanding levels of on-eye comfort and range of high-level Dks (that promote corneal health), ensure that Definitive materials are suitable for producing the widest range of lens designs.

Definitive materials can be machined in the same manner as other traditional hydrogels, but – with similar moduli to comparative water content hydrogel materials – don’t suffer the mechanical complications often associated with them.

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Definitive technical information

Material characteristics

PropertyDefinitive 50 Definitive 65 Definitive 74
ClassificationFilcon V3Filcon V4Filcon V3
Oxygen transmissibility (ISO) at 35°C *62.577.575
Swell factor at 20°C1.291.451.615
Water content at 20°C by weight50%65%74%
Refractive index at 20°C dry1.4801.4851.510
Refractive index at 20°C hydrated1.4061.3851.375
Light transmission at 380-780nm97.5%98.5%99%
Hardness (Shore D)818384
Oxygen permeability (ISO) at 35°C (barrers) 506260

* 0.08ct x 10-9 (cm2/sec) [ml O2 / (ml x mm Hg)]

Please note: These are typical values. Always check the certificate of conformity supplied with the goods for the actual values of the batch.

Manufacturing consumables

  • Low melt blocking wax
  • Contapol 2 polishing compound
  • Cotton polishing cloth
  • Delrin polishing cups
  • Delrin polishing sponge


  • Tweezers
  • Glass vials
  • Stoppers
  • Aluminium top seals
  • Flip tear up seals
  • Shrink-wrap sleeves
  • Net vial sleeves
  • DMV soft lens remover
  • Lens catch mat


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