Qualitative Filter Paper, 305 Grade, 55mm -320mm

Excl. VAT Incl. VAT

£6.46 to £34.45

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Variation ID		Product Code	Pack Size	List Price
13232	photo_camera	305055	55mm x 100 Pack 305055	£6.46
13233	photo_camera	305070	70mm x 100 Pack 305070	£6.82
13234	photo_camera	305090	90mm x 100 Pack 305090	£7.39
13235	photo_camera	305110	110mm x 100 Pack 305110	£8.56
13236	photo_camera	305125	125mm x 100 Pack 305125	£9.16
13237	photo_camera	305150	150mm x 100 Pack 305150	£10.39
13238	photo_camera	305185	185mm x 100 Pack 305185	£12.93
13239	photo_camera	305240	240mm x 100 Pack 305240	£17.58
13240	photo_camera	305300	300mm x 100 Pack 305300	£23.33
13241	photo_camera	305320	320mm x 100 Pack 305320	£34.45

Standard Qualitative Filter Papers are used for low gravity, or quadrant-folded applications. They have a higher level of α- cellulose than other filter papers. This means that they will weaken when the papers are introduced to water. We do not recommend Standard Qualitative Filter Papers if wet handling or vacuum work is necessary. In routine quadrant-folded applications the underlying strength of standard (untreated) grades does not present an issue.

Grade 305: is a fast-filtering qualitative paper designed for the filtration of coarse particles and gelatinous precipitates, such as ferric, aluminium, and magnesium hydroxides. Its rapid flow characteristics make it ideal for air monitoring and gas filtration applications where high throughput is essential. Grade 305 is also used in the routine cleanup of insoluble liquids, including biological fluids and organic compounds.

Application: Gelatinous Precipitates, Air and Gas Monitoring, Biological Fluid Cleanup

Key Features

Qualitative Analysis: Suitable for procedures aimed at identifying components in complex mixtures.

Fast Filtration Speed: Rapid flow makes it ideal for handling coarse or bulky precipitates efficiently.

Gelatinous Material Handling: Effective for difficult-to-filter substances like metal hydroxides.

Air and Gas Filtration: Frequently used in environmental labs for high-throughput air and gas monitoring.

Routine Cleanup Applications: Useful for filtering insoluble liquids such as biological and organic materials in general lab settings.

Gelatinous Precipitate Filtration
Air and Gas Monitoring
Fluid Cleanup

Available Grades

Grade	Whatman Equivalent	Speed	Thickness (mm)	Pore Size (μM)	Weight (g/m²)	Filtration Speed (sec*)	Burst Strength (kg/cm²)
301	= No.5	Very Slow Filtering	0.14	2-3	84	180	> 0.30
302	= No.3	Medium Filtering	0.3	12-16	150	65	3.90
303	= No.2	Medium Filtering	0.16	5-8	87	50	> 0.10
304	= No.1	Medium Filtering	0.16	5-13	73	88	1.95
305	= No.4	Fast Filtering	0.20	12-15	84	10	> 0.30