Anthracite for the world's drinking water
+44 (0) 1269 595925
Western Carbons produces a full range of grades of anthracite filter media. Theses are produced from the finest anthracite mined in South Wales. The product conforms to all the world's standards and is to be found in water treatment works in over 25 countries.
Standards
UK and European EN12909 - 2005
American AWWA B100-1     NSF61
Physical Characteristics
Raw Material Welsh Anthracite
Specific Gravity c 1.40
Bulk Density 0.72 - 0.74 kg/litre
Carbon Content minimum 90%
Ash Content maximum 7%
Volatile Matter maximum 8%
Hardness minimum 3 Moh
Grinding Index 50 - 70 Hardgrove
Compression Index minimum 150 bar
Attrition Loss max 1% in 100 hours backwashing
Acid Solubility max. 2% ( 24hours in 10% HCl )
Alkali Solubility max. 2% ( 24 hours in 10% NaOH )
Standard Grades (sizes in mm)
Grade Size Range Effective Size Hydraulic Size Uniformity
11 0.60 - 1.18 0.65 - 0.75 0.75 - 0.85 <1.50
12 0.60 - 1.40 0.65 - 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 <1.45
17 0.85 - 1.70 0.90 - 1.05 1.10 - 1.30 <1.50
21 1.18 - 2.50 1.30 - 1.42 1.60 - 1.80 <1.50
22 1.40 - 2.50 1.45 - 1.60 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 1.75 - 1.85 2.00 - 2.20 <1.35
26 1.60 - 2.50 1.65 - 1.75 1.90 - 2.10 <1.40
29 1.40 - 2.80 1.45 - 1.65 1.90 - 2.20 <1.35
31 2.00 - 4.00 2.00 - 2.20 <1.60
32 2.50 - 5.00 2.50 - 2.70 <1.60