Classification

Action in which coffee grains are separated by sieves according to their size, also called screening. The sieve classification number is as follows:
sifting number…………mm
15 ……………………………5,95
16………………………….6,35
17………………………….6,75
18………………………….7,14
19………………………….7,54
The larger the size of the grain, the higher its value (except in the case of the pea-bean coffee) as it indicates better quality, especially in the toasting process.