Structure of Cells
To calculate the number of pores we use a square opening with the size of exactly 10 x 10 mm and a magnifying glass. The cut pores along two vertical sides of the opening are counted and multiplied. After having repeated such measurement twice we determine the mean value.
Number of pores/cm³
60 - 300 fein
25 - 120 medium
10 - 40 rough
6 - 12 extra rough
