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Description of key information

Determination of the Minimum Ignition Energy (MIE) under standardised conditions (milling and sieving at size < 63 um) showed a high susceptibility to ignition. Determination on standard product as is (without size reduction) indicate also high sensitivity to ignition (dust explosivity potential).
MIE: 1-3 mJ (commercial grade, milled and sieved to achieve a homogeneous particle size of less than 63 um according to EN standard 13821)
MIE: 8-10 mJ (commercial grade as is, majority of particles > 100 um)

Additional information

The results of 3 different studies investigating the Minimum Ignition Energy of dust/air mixtures to assess the dust explosive potential (or combustible dust hazard) for the purpose of Process Safety measures in the production sites are summarized below: 

 

Sample description

Particle size

method

MIE results

Product 1

(1993)

Commercial grade as is, without size reduction

No data (majority > 63 um)

British standard BS:5958 part 1:1991

8 – 10 mJ

Product 2

(2006)

Commercial grade, milled and sieved to < 63 um according to EN standard (normalised sample*)

< 63 um

(no details)

EN 13821

EN 14034-2

1 – 3 mJ

Kst: 314 bar.m/s

Product 3

(2007)

Commercial grade, milled and sieved to size < 63 um according to EN standard (normalised sample*)

D50: 15 um

D90: 41 um

EN 13821

 

1- 3 mJ

Sample from the inspection hatch of the drier output, without size reduction (^)

D50: 89um

D90: 171 um

30- 100 mJ

Product 4

(2007)

Commercial grade, ground and sieved to size < 63 um according to EN standard (normalised sample*)

D50: 15 um

D90: 44 um

EN 13821

1- 3 mJ

Refusal from Sieve 63 um

D50: 20 um

1- 3 mJ

sample from the inspection hatch of the drier output, without size reduction (^)

D50: 50 um

D90: 100 um

3- 10 mJ

*The current EN standard requires assessing the MIE on samples after reduction by milling and sieving of particles to sizes less than 63 um.

(^) due to the localization of the sampling, the size is not representative of the commercial product, but rather a fraction of broken particules produced during the drying process.

 

These results indicate a high sensitivity to static charges, even for the products as is.