CTA Report, Draft 1, ISP Review - US Chemical Safety and Hazard ...
CTA Report, Draft 1, ISP Review - US Chemical Safety and Hazard ...
CTA Report, Draft 1, ISP Review - US Chemical Safety and Hazard ...
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B.2 Minimum Explosible Concentration<br />
Minimum explosible concentration (MEC) is the minimum concentration of a combustible dust cloud that<br />
is capable of propagating a deflagration through a uniform mixture of dust <strong>and</strong> air under specified<br />
conditions. MEC data provide a relative measure of the minimum concentration of a dust cloud necessary<br />
for an explosion. The values obtained are specific to the sample (particularly particle size distribution)<br />
<strong>and</strong> test method. MEC values are not to be considered intrinsic material constants. The test was<br />
performed per ASTM E1515-00, St<strong>and</strong>ard Test Method for Minimum Explosible Concentration of<br />
Combustible Dusts (2000b), using the U.S. Bureau of Mines 20-liter explosibility chamber.<br />
Figure B-3 compares MECs for the Borden <strong>Chemical</strong> SD-52SS phenolic resin, Pittsburgh coal dust,<br />
polyethylene dust, <strong>and</strong> cornstarch.<br />
MEC<br />
(g/m³)<br />
70<br />
60<br />
50<br />
40<br />
30<br />
20<br />
10<br />
0<br />
28<br />
50<br />
60<br />
60<br />
Cornstarch<br />
Pittsburgh Pulverized Coal<br />
Dust<br />
SD-52SS + Carbon Black #2<br />
Polyethylene<br />
Figure B-3. Minimum explosive concentration of Durite SD-52SS<br />
compared with other common combustible dusts.<br />
105