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Filters

Filters are available in a number of different materials, the most common type is Glass Fibre where gravimetric weighing is the only analysis.

If further analysis is required or the hazard being sampled is corrosive or if there is interference with glass fibre then other types are recommended, e.g. Mixed cellulose ester (MCE), PVC, PTFE, Polycarbonate, Quartz, Silver

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Filters

Filters are available in a number of different materials, the most common type is Glass Fibre where gravimetric weighing is the only analysis.
If further analysis is required or the hazard being sampled is corrosive or if there is interference with glass fibre then other types are recommended, e.g. Mixed cellulose ester (MCE), PVC, PTFE, Polycarbonate, Quartz, Silver

GLASS FIBRE FILTERS (GFA)


These low cost filters are commonly referred to as depth filters. They are ideal for general gravimetric air sampling and analysis. Suitable when no other analysis than weighing is required. Binder and additive free. Available unweighed and pre-weighed.

 

MAIN PROPERTIES

  • Fastest flow rate
  • High load capacity
  • No electrostatic problems
  • Low pressure drop
  • Up to C500 Degree Range
  • Inert Composition
  • Sub micron level retention

AIR SAMPLING APPLICATION

  • General Gravimetric
  • Isocyanates
  • Ethylene Glycol
  • Air Quality Fractions
Part Number Description Diameter Pore Size Pack Size
P102050 Glass Fibre Filter, Grade A, Binderless 25mm 100
P102051 Glass Fibre Filter, Grade A, Binderless 37mm 100
P102052 Glass Fibre Filter, Grade A, Binderless 47mm 100
P102053 Glass Fibre Filter, Grade A, Binderless 55mm 100
P102054 Glass Fibre Filter, Grade A, Binderless 70mm 100
P102055 Glass Fibre Filter, Grade A, Binderless 90mm 100

 

MIXED CELLULOSE ESTER (MCE)

Suitable for further analysis other than gravimetric. Primarily used for air sampling of metals and fibres (e.g. Asbestos).
MCE is stronger than GFA so ideal when further post analysis is required other than weighing.

 

MAIN PROPERTIES

  • Dissolves completely
  • Readily rendered transparent for fibre counting
  • No moisture issues

AIR SAMPLING APPLICATION

  • Metal dust analysis
  • Asbestos and man-made fibres
  • Air quality
Part Number Description Diameter Pore Size Pack Size
P102063 MCE Filters, Plain White 25mm 0.45µm 100
P102064 MCE Filters, Plain White 25mm 0.8µm 100
P102065 MCE Filters, Plain White 25mm 1.2µm 100
P102066 MCE Filters, Plain White 37mm 0.45µm 100
P102067 MCE Filters, Plain White 37mm 0.8µm 100
P102068 MCE Filters, Plain White 47mm 0.45µm 100
P102069 MCE Filters, Plain White 47mm 5.0µm 100
P102070 MCE Filters, Plain White 47mm 0.8µm 100
P102071 MCE Filters, Gridded Black 25mm 0.45µm 100
P102072 MCE Filters, Gridded Black 25mm 0.8µm 100
P102073 MCE Filters, Gridded Black 37mm 0.45µm 100
P102074 MCE Filters, Gridded Black 47mm 0.45µm 100
P102075 MCE Filters, Gridded Black 37mm 0.8µm 100
P102076 MCE Filters, Gridded Black 47mm 0.8µm 100
P102077 MCE Filters, Gridded Green 25mm 0.45µm 100

 

POLY VINYL CHLORIDE (PVC)

High quality filters for measuring dust, silica and chromium.
They have a low tare weight so suitable for lower sample levels and have gravimetric stability.
Low ash levels means interference free silica determinations.

 

MAIN PROPERTIES

  • Low tare weight
  • Silica free and low ash
  • Non-oxidizing surface
  • Low moisture pick-up

AIR SAMPLING APPLICATION

  • Gravimetric analysis
  • Hexavalent Chromium
  • Silica
Part Number Description Diameter Pore Size Pack Size
P102078 PVC Membrane Filter 25mm 5.0µm 100
P102079 PVC Membrane Filter 37mm 5.0µm 100
P102080 PVC Membrane Filter 47mm 5.0µm 100

 

POLYTETRAFLUOROETHYLENE (PTFE)


High quality, chemically resistant filters suitable for aggressive environments. Suitable for highly sensitive, interference free determinations.
Low tare weight means gravimetric stability and suitable for use with lower sample levels.

MAIN PROPERTIES

  • Hydrophobic
  • Chemically inert
  • Suitable for aggressive environments

AIR SAMPLING APPLICATION

  • Alkaline dusts
  • PAH’s
  • Pesticides
  • Isocyanates
  • Ambient air quality
Part Number Description Diameter Pore Size Pack Size
P102082 PTFE Filter, PTFE Support 25mm 1.0µm 100
P102083 PTFE Filter, PMP Support 25mm 3.0µm 50
P102085 PTFE Filter, PP Support 37mm 0.45µm 50
P102086 PTFE Filter, PTFE Support 37mm 1.0µm 100
P102087 PTFE Filter, PP Support 37mm 1.0µm 50
P102088 PTFE Filter, PTFE Support 37mm 2.0µm 100
P102089 PTFE Filter, Unlaminated 37mm 5.0µm 50
P102090 PTFE Filter, PTFE Support 47mm 0.5µm 50
P102091 PTFE Filter, PTFE Support 47mm 1.0µm 50
P102092 PTFE Filter, PMP Support 47mm 2.0µm 50
P102094 PTFE Filter, Unlaminated 47mm 5.0µm 50
P102095 PTFE Filter, PTFE Support 47mm 2.0µm 50

 

POLYCARBONATE

These filters have a smooth glass-like surface with precise pore size and distribution for specific filtration and separation.
Available in a range of pore sizes. They are optically transparent and non-staining which means they are ideal for sample observations.

 

MAIN PROPERTIES

  • Smooth surface for microscopy
  • Precise pore size and distribution
  • Chemically and Biologically inert
  • Strong
  • Optically transparent & non-staining

AIR SAMPLING APPLICATION

  • Asbestos fibres
  • Scanning electron microscopy applications
Part Number Description Diameter Pore Size Pack Size
P102096 Polycarbonate Filter 25mm 0.2µm 100
P102097 Polycarbonate Filter 25mm 0.4µm 100
P102098 Polycarbonate Filter 25mm 0.8µm 100
P102099 Polycarbonate Filter 37mm 0.2µm 100
P102100 Polycarbonate Filter 37mm 0.4µm 100
P102101 Polycarbonate Filter 37mm 0.8µm 100
P102102 Polycarbonate Filter 47mm 0.4µm 100

 

QUARTZ

Quartz filters are heat treated for improved purity allowing trace level analysis.
They are heat resistant and suitable for use in stacks or for diesel emissions and are acid resistant..
They have a high flow rate. Binder and additive free.

 

 

MAIN PROPERTIES

  • High purity for trace level analysis
  • Temperature resistant to 300°C
  • Autoclavable
  • High filtration rate

AIR SAMPLING APPLICATION

  • High temperature applications
  • Stack sampling
  • Diesel particulates
  • Acidic gases
Part Number Description Diameter Pore Size Pack Size
P102103 Quartz Filter 25mm 100
P102104 Quartz Filter 37mm 25

SILVER

Made from high purity silver, these filters can be cleaned and re-used.
They have a smooth surface for particle capture and easy observation.
They are available in different pore sizes.

MAIN PROPERTIES

  • 97% pure silver
  • High temperature resistance
  • High chemical resistance
  • Uniform porosity and thickness

AIR SAMPLING APPLICATION

  • Bromine
  • Asbestos by TEM
  • Silica by X-ray diffration
Part Number Description Diameter Pore Size Pack Size
P102108 Silver Membrane Filters – 25mm – 0.8um 25mm 0.8µm 25
P102109 Silver Membrane Filters – 37mm – 0.8um 37mm 0.8µm 25

FILTER SUPPORT PADS

Cellulose or porous plastic filter support pads available in 25mm or 37mm diameter.

Part Number Description Diameter Pore Size Pack Size
P102110 Cellulose Filter Support Pads 25mm 100
P102111 Cellulose Filter Support Pads 37mm 100
P102112 Porous Plastic Filter Support Pads 25mm 100
P102113 Porous Plastic Filter Support Pads 37mm 100

[:fr]Filters are available in a number of different materials, the most common type is Glass Fibre where gravimetric weighing is the only analysis.
If further analysis is required or the hazard being sampled is corrosive or if there is interference with glass fibre then other types are recommended, e.g. Mixed cellulose ester (MCE), PVC, PTFE, Polycarbonate, Quartz, Silver