![Whatman® qualitative filter paper, Grade 91, creped circles [Pack of 1000]](https://idealmedical.co.za/wp/wp-content/uploads/2023/09/917-Filter-paper-91.jpg)
Description
General description
These extremely strong filter papers have a high wet strength due to the addition of a small quantity of chemically stable resin. Normal qualitative applications will not introduce any significant impurities into the filtrate. The resins do, however, contain nitrogen so these grades should not be used in Kjeldahl estimations, etc. Some wet strengthened grades are available in folded (prepleated) forms.
Grade 91: 10 μm (credped filter paper)
A general purpose creped filter for less critical routine analysis. Widely used to assay sucrose in cane sugar and within pharmaceutical laboratories for routine filtration.
Grade 91: 10 μm (credped filter paper)
A general purpose creped filter for less critical routine analysis. Widely used to assay sucrose in cane sugar and within pharmaceutical laboratories for routine filtration.
PROPERTIES
material
cellulose filters
circles
packaging
pack of 1000
manufacturer/tradename
Whatman 1091-185
Whatman Article No. 28417534 (US reference)
parameter
2 psi wet burst
70 sec/100 mL speed (Herzberg)
diam.
150 and 185 mm
thickness
205 μm
pore size
10 μm (Particle retention)
basis weight
71 g/m2
![Whatman® quantitative filter paper, hardened ashless, Grade 541 [Pack of 100]](https://idealmedical.co.za/wp/wp-content/uploads/2022/05/414-Whatman-541-300x300.png)
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