Product Description
Whatman Filter Paper – Grade 40
WET STRENGTH
L – Suitable for gravity or low suction filtration. Care must be taken to prevent rupture of paper
M – Will withstand all normal use on Buchner Funnels or others devices under suction or moderate pressure
H – High wet strength and high chemical resistance
|
Grade No |
Flow rate |
Retention microns |
Wet Strength |
Thickness, mm |
Ash % |
|
|
Ashless |
General purpose gravimetric paper |
Medium |
8 |
L |
0.20 |
0.01 |
Of the quantitative papers, Grade 40 is the classic general purpose ashless paper, with medium speed and retention. Some typical applications include:
- Gravimetric analysis for substances/contaminants in cements, clays, iron, and steel.
- Separating solid matter in general soil analysis
- Quantitation of sediments in milk
- Analytical grade clean-up for atomic absorbance spectroscopy
- Collection of trace elements and radionuclides from the atmosphere
| Grade | Typical Particle Retention in Liquid (µm)1 | Filtration Speed Herzberg (s) | Nominal Ash Content (%)3 | Nominal Thickness (µm) | Nominal Basis Weight (g/m2) | Typical Water Flow Rate (mL/min)2 | Nominal Air Flow Rate (s/100 mL/in2) |
|---|---|---|---|---|---|---|---|
| 40 | 8 | – | 0.007 | 210 | 95 | 25 | 21 |
