| | Class | Material used | Median *
diameter
（ µm ） | Particle
density
（ g/cm3 ） | Chemical composition
% （ mass ） | | Class 1
Class 2
Class 3 | Quartz sand | 185 to 200
27 to 31
6.6 to 8.6 | 2.6 to 2.7 | | SiO2 | | 95min | | Fe2O3, Al2O3,TiO2
MgO,Ign.loss | 5max | | | Class 4
Class 9 | Talc | 7.2 to 9.2
4.0 to 5.0 | 2.7 to 2.9 | | SiO2 ••• 60 to 63, | Al2O3 ••• 0 to 3, | MgO ••• 30 to 34 | | Fe2O3 ••• 0 to 3, | CaO ••• 0 to 2, | Ign.loss ••• 3 to 7 | | | Class 5
Class 10 | Fly ash | 13 to 17
4.8 to 5.7 | 1.95 min | SiO2Åc45min
Ign.lossÅc5max | | Class 7
Class 8
Class 11 | **
KANTO
（Japanese） loam | 27 to 31
6.6 to 8.6
1.6 to 2.3 | 2.9 to 3.1 | | SiO2 ••• 34 to 40, | Al2O3 ••• 26 to 32, | MgO ••• 0 to 7 | | Fe2O3 ••• 17 to 23, | CaO ••• 0 to 3, | Ign.loss ••• 0 to 4 | | | Class 12 | Carbon black | Particle size range ••• 0.03 to 0.20 µm
Absorbed amount of DBP ••• 25 to 34 ml/100g
Adsorbed amount of iodine ••• 22 to 30 mg/g | | Class 16
Class 17 | Calcium-
carbonate （heavy） | 3.6 to 4.6
1.9 to 2.4 | 2.7 to 2.8 | | CaO ••• 54 to 56, | SiO2 ••• 0 to 3, | Ign.loss ••• 42 to 45 | | MgO ••• 0 to 3, | Fe2O3 ••• 0 to 1 | | | | * | Particle size distributions are defined by JIS 8901. | | ** | Sintered at 800°C, 2hours. | | Note :1） | Class15 Mixed powder is distributed by Japan Air Cleaning Association and contains 72% of Class8, 23% of Class12 and 5% of cotton linter. | | 2） | Class13 and Class 14 are now absent ones. | | | *Particle size distribution of Test Powders 1 | | Particle size distribution of
Class 1, Class 2 and Class 3
（ Quartz sand ） | | Particle
size µm | Oversize（on mass basis）% | | Class 1 | Class 2 | Class 3 | | 5 | - | 88±5 | 61±3 | | 10 | - | 76±3 | 43±3 | | 20 | - | 62±3 | 27±3 | | 30 | - | 50±3 | 15±3 | | 40 | - | 39±3 | 9±3 | | 45 | 99 min. | - | - | | 75 | 90±3 | 20max. | 3max. | | 106 | 80±3 | - | - | | 150 | 65±3 | - | - | | 212 | 45±3 | - | - | | 300 | 1max. | - | - | | | Particle size distribution of
Class 4 and Class 9
（ Talc ） | | Particle
size µm | Oversize（on mass basis）% | | Class 4 | Class 9 | | 2 | - | 79±5 | | 4 | - | 55±5 | | 5 | 69±5 | - | | 8 | - | 23±5 | | 10 | 40±5 | - | | 16 | - | 6±3 | | 20 | 12±5 | - | | 30 | - | - | | 40 | 3±3 | - | | 75 | 1max | - | | | Particle size distribution of
Class 5 and Class 10
（ Fly ash ） | | Particle
size µm | Oversize（on mass basis）% | | Class 5 | Class 10 | | 2 | - | 82±5 | | 4 | - | 60±3 | | 5 | 84±5 | - | | 8 | - | 22±5 | | 10 | 60±5 | - | | 16 | - | 3±3 | | 20 | 32±5 | - | | 30 | 15±3 | - | | 40 | 8±3 | - | | 106 | 1max. | - | | | Particle size distribution of
Class 7, Class 8 and Class 11
（ KNATO（Japanese） loam ） | | Particle
size µm | Oversize（on mass basis）% | | Class 7 | Class 8 | Class 11 | | 1 | - | - | 65±3 | | 2 | - | - | 50±5 | | 4 | - | - | 22±3 | | 5 | 88±5 | 61±5 | - | | 6 | - | - | 8±3 | | 5 | - | - | 3±3 | | 10 | 76±3 | 43±3 | - | | 20 | 62±3 | 27±3 | - | | 30 | 50±3 | 15±3 | - | | 40 | 39±3 | 9±3 | - | | 75 | 20max. | 3max. | - | | | Class 12 Particle size range
（ Carbon black ） | | | Particle size distribution of
Class 16 and Class 17
（ Calcium carbonate（ heavy ）） | | Particle
size µm | Oversize（on mass basis）% | | Class 16 | Class 17 | | 1 | - | 80±5 | | 2 | 76±5 | 54±5 | | 4 | - | 18±5 | | 5 | 40±5 | - | | 8 | - | 4±3 | | 10 | 10±5 | - | | 16 | - | 1max. | | 20 | 1max. | - | | |
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