Sampling materials

Sampling materials

Sampling materials used throughout the odour measurement process (from obtaining sample to analysis) require an absent or minimized inference with the odorant gas.  The main criteria for material of the sampling container/bag or device is outlined below:

  • The material be inert with the odourous gas
  • The material be odourless
  • Material be of low permeability to prevent diffusion of odorant gas and outside environment across material
  • Opaque so as to prevent odourous gas from reacting/degrading with sunlight
  • Impervious so as to
  • Smooth surface

Materials listed below are inert:

  • Polytetrafluoroethylene (PTFE, Teflon TM)
  • copolymer of Tetrafluoroethylene and Hexafluoropropylene (FEP)
  • Polyethyleneterephtalate (PET, Nalophan TM )
  • glass (disadvantage: fragility)
  • steel (advantage: high mechanical and thermal stability; disadvantage: not always chemically inert, condensations or other depositions)

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