Anthracite
High-carbon anthracite filter medium made from hard, durable grains. Used as the top (lighter) layer above silica sand in dual-media filters. Compliant with EN 12909.
What is Anthracite?
Anthracite is a high-carbon filter medium made from hard, durable grains that forms the top layer of dual-media filters in drinking-water, wastewater and process treatment plants. Thanks to its low density and high carbon content, when used together with silica sand it delivers deep-bed filtration and long filter cycles. It is compliant with EN 12909.
Anthracite is a natural filter medium processed from premium anthracite coal and freed of iron sulphide, clay, shale and dust. Its typical carbon content is ≈92%, moisture ≈2%, ash ≈5% and volatile matter ≈6%, with an acid solubility below 2%. With an effective grain size (d₁₀) of 0.9–1.0 mm and a uniformity coefficient ≤1.4, the product is supplied in a 0.8–1.6 mm grain range. With a bulk density of ≈700 kg/m³ and a Mohs hardness of 3–4, the anthracite provides minimal media loss with very low abrasion loss of ≈0.1% over backwashing.
Technical summary & chemistry
Values are taken from real batch analyses; an up-to-date batch report is provided with every shipment.
Technical Summary
- Grain size
- 0.8–1.6 mm
- Certificate
- EN 12909
Chemical Composition
- Carbon (dry, ash-free)
- ≈ 92%
- Moisture
- ≈ 2%
- Ash
- ≈ 5%
- Volatile matter
- ≈ 6%
- Acid solubility (19% HCl)
- maks. 2%
- Hardness (Mohs)
- Mohs 3–4
Additional Technical Properties
- Efektif tane boyutu (d₁₀)
- 0,9–1,0 mm
- Üniformite katsayısı
- ≤ 1,4
- Yığın yoğunluğu
- ≈ 700 kg/m³
- Özgül yoğunluk
- 1,35–1,6 kg/cm³
- Tane gözenekliliği
- < %10
- Aşınma kaybı (100 geri yıkama)
- ≈ %0,1
- Alt boyut (< 0,8 mm)
- maks. %5
- Üst boyut (> 1,6 mm)
- maks. %5
Where is it used?
Thanks to its low density it sits above the silica sand, offering the dual-media filtration advantage in removing insoluble clay, mud and sediment as well as oxidised iron and manganese.
In drinking-water and wastewater treatment it extends filter cycles and reduces pressure loss.
Its coarse, porous structure carries particles deep into the bed, increasing retention capacity.
Fractions & sieve analysis
Produced in 4 controlled gradations. Click each fraction to see its sieve analysis (retained %).
Fraction
4 fractionsAbout Anthracite
What is anthracite used for?
It is used in the top layer of dual-media filters; thanks to its low density it stays above the silica sand and provides deep filtration in removing clay, mud, sediment and oxidised iron/manganese.
What is the carbon content of anthracite?
Our product has a typical fixed carbon content of about 92% and is compliant with EN 12909.
Why are anthracite and silica sand used together?
The lighter anthracite sits on top and the heavier silica sand below, forming a dual-media filtration bed; this structure increases retention capacity and filter cycle time.
What is the uniformity coefficient of anthracite?
The uniformity coefficient is ≤1.4 and the effective grain size (d₁₀) is 0.9–1.0 mm. These values provide a balanced, efficient filter bed.
What can you rely on?
Batch-based analysis
Grain size and chemical composition are reported with every shipment.
Consistent quality
Production at our own facility; consistent batch-to-batch results.
Flexible packaging
Bulk, big-bag or sack — delivered to suit your requirement.
Free sample
We provide a sample and technical support before you decide.
Consider together
Get a quote for Anthracite
Tell us what you need; we will get back to you quickly with the right grain size, packaging and shipping.