Filters

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.

[: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