Unifilt Anthrafilt - Anthracite Filter Coal

Composed of specially selected and graded hard, durable anthracite coal particles. The anthracite shall have an average specific gravity of 1.60 (or more), with hardness (MOH Scale) of 3.00 or more, and shall be essentially free of iron, sulfide, clay, shale, extraneous dirt, and excessive dust, and shall be in strict accordance with AWWA B100-09. Carbon Content shall be a minimum of 80% on a dry-weight basis. Ash Content shall be a maximum of 15%. Volatile Matter shall be 7% maximum on dry-weight basis. There shall be not more than 3% float when placed in a fluid of specific gravity of 1.45, and not more than 3% sink when placed in a fluid of specific gravity of 1.95, when tested in accordance with ASTM D4371-84, Methods for Determining the Washability Characteristics of Coal. The filter anthracite shall be processed with wet washing, screening and biological neutralization. The durability or friability shall be less than 3%.