Description
Whatman Grade-4 1004-125
Properties
material
cellulose filters
circles
packaging
pack of 100
manufacturer/tradename
Whatman 1004-125
Whatman Article No. 28413917 (US reference)
parameter
0.25 psi wet burst
150 sec/100 mL speed (Herzberg)
diam.
125 mm
thickness
180 μm
ash
≤0.06%
pore size
11 μm (Particle retention)
basis weight
87 g/m2
Whatman Grade-4 1004-125, Qualitative Filter Paper Round Sheet, Pack of 100 (12.5 CM Diameter).
Description
General description
Grade 4: 11 μm (medium flow filter paper)
The most widely used filter paper for routine applications with medium retention and flow rate. These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.
Features and Benefits
- Qualitative analytical separations for precipitates such as lead sulfate, calcium oxalate (hot), and calcium carbonate
- Agricultural soil analysis and seed testing procedures
- Industrial food processing techniques to extract liquid or separate solid foodstuffs from associated liquid
- Air pollution monitoring by collecting atmospheric dust from airflow and photometrically measuring the stain-intensity
- Gas detection by quantitative chromogenesis with optical reflectance
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