Anthracite Filter Media
Specification and Grades
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Western Carbons produces a full range of  grades
of anthracite filter media. These are produced
from the best anthracite mined in South Wales,
and are sold throughout the world.
Standards
American AWWA B100-01
European EN12909
Physical Characteristics
Raw Material Welsh Anthracite
Specific Gravity c1.40
Bulk Density 0.72 - 0.74 kg/litre
Carbon Content min. 90%
Ash Content max. 7%
Volatile Matter max. 8%
Hardness min. 3 Moh
Grinding Index 50 - 65 Hardgrove
Compression Index min. 150 bar
Attrition Loss max. 2% in 100 hours backwashing
Acid Solubility max. 2% [24 hours in 10% HCl]
Alkali Solubility max. 2% [24 hours in 10% NaOH]
Standard Grades

    E.S.    Effective Size
    H.S.    Hydraulic Size
    U.C.    Uniformity Coefficient
    All sizes in millimeters
    Most common sizes in red

Grade  Size Range  E.S.  H.S.  U.C.
 11  0.60 - 1.18  0.63 - 0.75  0.75 - 0.80  <1.50
 12  0.60 - 1.40  0.64 - 0.80   0.80 - 0.95   <1.60 
 13  0.80 - 1.40  0.85 - 0.95   1.00 - 1.20   <1.40 
 14  0.80 - 1.60  0.85 - 1.00   1.05 - 1.25   <1.50 
 15   0.85 - 1.60   0.90 - 1.05   1.10 - 1.25  <1.40
 16   0.60 - 1.60  0.65 - 0.85  0.85 - 1.10  <1.70
 17  0.85 - 1.70  0.90 - 1.05  1.10 - 1.30  <1.50
 18  1.00 - 1.60  1.05 - 1.15  0.95 - 1.20  <1.40
 21  1.18 - 2.50  1.25 - 1.42  1.60 - 1.80    <1.50
 22  1.40 - 2.50  1.45 - 1.65  1.75 - 1.95  <1.40
 24  1.00 - 2.00  1.05 - 1.20  1.35 - 1.50  <1.50
 25  1.70 - 2.50  1.72 - 1.85  2.00 - 2.20   <1.35
 26  1.60 - 2.50  1.65 - 1.80   1.90 - 2.10   <1.40
 27  1.18 - 2.36  1.25 - 1.40  1.55 - 1.75  <1.50 
 28  1.18 - 2.00  1.25 - 1.40  1.55 - 1.70  <1.40
 29  1.40 - 2.80  1.45 - 1.70  1.90 - 2.30  <1.50
 30  2.00 - 4.00      
 31  2.50 - 4.00      
 32  2.50 - 5.00      
 37  3.50 - 7.00      
 39  2.00 - 6.00      

Other sizes may be made to fit the customer's exact requirements

 Maximum

 Oversize

  Undersize
 Grade 1 5% 5%
 Grade 2 5% 5%
 Grade 3 10% 10%

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