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F Carbonaceous Dusts Carbon Black, Coal Dust or Coke Dust G Agricultural Dusts Grain, Flour, Sugars, Spices and certain Polymers (The IEC has developed Zones for atmospheres containing combustible dusts, which again separates areas in to three Zones 20, 21 and 22.) Zone 20, 21 and 22 Locations

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• More ash contained in the coal • Dark IC material present in sample (such as black shale) • LTA insensitive to dust particle size – User variability • Dust sample not completely dry • Insufficient mixing of sample • NIOSH retested samples resulted in 96% agreement between methods (CDEM results err on the side of safety)