Then it is folded again and creased to produce a quarter circle.
Folding filter paper chemistry.
Obtain a round piece of filter paper.
Folding a filter paper cone so that it beds well down into the funnel creating a good seal when wet makes for an efficient filtration step.
The paper is often crêped to improve porosity.
Fold it in half as shown on the right.
Open the filter paper as shown on the right and place it in the funnel.
Now fold it again as shown on the right.
Many conical filter funnels have an angle of about 60.
The 60 filter paper funnel.
Most filter papers are made on small paper machines for laboratory filters the machines may be as small as 50 cm width.
The filter papers may also be treated.
From left to right and top to bottom one first folds the round piece of filter paper in half and creases it.