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WHATMAN FILTER DATA
	GD/X 13 mm	GD/X 25 mm
Housing	Polypropylene (pigment free)	Polypropylene (pigment free)
Filtration Area	1.3 cm2	4.6 cm2
Maximum Pressure	100 psi	75 psi
Volume ‘Hold Up’ Full Housing	0.5 mL	1.4 mL
with Air Purge	50 µL (approx)	250 µL (approx)
Dimensions	21.7 mm x 29.7 mm	21.7 mm x 29.7 mm
Weight	3 g (approx)	3 g (approx)
Flow Direction	Flow should enter from the inlet	Flow should enter from the inlet
Inlet Connection	Female luer lock	Female luer lock
Outlet Connection	Male slip luer	Male slip luer
Sterilization	Autoclave at 121ºC (131ºC max)	Autoclave at 121ºC (131ºC max)
	at 15 psi for 20 minutes†	at 15 psi for 20 minutes†
Biosafe	All materials pass USP Class VI	All materials pass USP Class VI
Glass Microfiber	100% borosilicate	100% borosilicate
Prefiltration Media	GMF 150 10 µm : 1 µm	GMF 150 10 µm : 1 µm
	GF/F 0.7 µm	GF/F 0.7 µm

GD/X syringe filters

Whatman GD/X disposable syringe filters are the ideal choice for the preparation of hard-to-filter samples. The syringe filters have a pigment-free polypropylene housing to eliminate sample contamination and contain a unique prefiltration stack of Whatman GMF 150 (graded density) and GF/F glass microfibre media, which allows you to filter even the most difficult samples with less hand pressure. Compared to an unprotected membrane, GD/X syringe filters can process three to seven times more sample volume.

GMF 150 (graded density) and GF/F are produced from 100% borosilicate glass microfibre. The unique, graded density GMF 150 medium has a coarse top layer meshed with a fine layer beneath that retains particles to 1.0 µm. A GF/F filter then retains particles down to 0.7 µm. Below the prefilter stack is the final membrane.

This provides exceptionally good loading capacity with fast flow rates and avoids the build up of back pressure often experienced through "blocking" of an unprotected membrane.

Features and Benefits

13 mm and 25 mm diameter syringe filters
13 mm device for samples up to 10 mL and 25 mm device for samples larger than 10 mL

Applications
Hard-to-filter heavily particulate laden samples

Dissolution testing

Content uniformity

Concentration analysis

Routine sample preparation

Food analysis

Environmental samples

Composite assay

Safety
High pressures can be obtained when using syringes. The smaller the syringe the higher the pressure that can be generated. As a general guide, the following pressures can be obtained by hand with the syringes indicated: 20mL- 30 psi; 10mL- 50 psi; 5mL- 75 psi; 3mL- 100 psi; 1m- 150 psi. Each user should determine the pressure they can generate by hand with a specific size syringe and take appropriate safety precautions not to exceed the recommended rating for the device used. If these limitations are exceeded, bursting of the device may occur.