Standard

NS-EN ISO 9913-2:2000

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Omfang

This part of ISO 9913 describes a coulometric method for the determination of oxygen permeability of both rigid and non-hydrogel flexible contact lens materials and oxygen transmissibility of rigid and non-hydrogel flexible contact lenses. It specifies the procedures for the measurements and establishes the conditions under which measurements are made. This part of ISO 9913 is applicable to the determination of oxygen transmissibility of rigid and non-hydrogel flexible contact lenses, incorporating various refractive powers and radially symmetric contact lens geometries, and the oxygen permeability (Dk) of rigid and non-hydrogel flexible contact lens materials in the form of standardized test samples. This part of ISO 9913 is especially useful for the determination of permeability values above 75 x 10 -11 (cm2/s) [ml O2/(ml x hPa)], which fall above the usual range of the standard polarographic method of measurement (FATT method, see ISO 9913-1). This part of ISO 9913 is not applicable to hydrogel materials or hydrogel contact lenses.

Dokumentinformasjon

  • Standard fra SN
  • Publisert:
  • Tilbaketrukket:
  • Utgave: 1
  • Versjon: 1
  • Varetype: NAT
  • ICS 11.040.70
  • National Committee CEN/TC 170

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