Hardness

Increasing force is applied to the grains to assess the crushing resistance of pellets until their breaking point.

———— CEMAGREF-COMIFER NOVAEM
Hardness, crash resistance > to 30 Newton > to 35 Newton on average

Caking and moisture recovery

———– CEMAGREF-COMIFER NOVAEM
Resistance to mass-taking < to 50 Newton < to 30 Newton
Resistance to moisture intake close to 0 close to 0

A fertilizer sample is subjected to a load of 17 kg for 3 days at 40oC. The force needed to break the clod is then measured.

Density

A 1-litre test tube is filled with the sample to be tested, packed and weighed.

———– CEMAGREF-COMIFER NOVAEM
Nitrogen fertilizer density 0,85 to 0,95 kg/l 0,8 to 1,1 kg/l
Compound fertilizer density 0,90 to 1,20 kg/l 1 to 1,15 kg/l

Dust rate

———– CEMAGREF-COMIFER NOVAEM
Dust rate less than 1 per 1000 less than 0.5 per 1000

A fertilizer sample is introduced into a counter-airflow column to remove the dust. The weighing differential before and after the column passages is used to calculate the dust level.

Granulometrie

A sample of fertilizers was passed through smaller and smaller grids to assess the different granulometric slices of the sample.

This test is used to determine the median diameter (D50) of the sample.

————- CEMAGREF-COMIFER NOVAEM
Median diameter minimum 3 mm 80% des granulés entre 2,5 et 4 mm
Granulometric sling

3,35 mm on average

3 < D50 < 3,5 mm

2,5 < 80% < 4 mm

2 < 96% < 4,75 mm

 

 

Sphericity

————- CEMAGREF-COMIFER NOVAEM
Sphericity > to 60% > to 70%

The pellets are poured on a moving disc.

The round pellets roll towards a receptacle, the others are ejected by wind tunnel.

We weigh the proportion of round pellets.

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