Metallurgical coke backfill helps provide a uniform current output over the entire length of a groundbed. It will also lower the anode-to-soil resistance, thereby increasing the performance life of the anode.

Resistance:

• Loose: 15 to 20 ohms/cm3
  
• Lightly compacted: 10 to 15 ohms/cm3
  
• Tightly compacted: 10 ohms/cm3
  

Approximate Chemical Analysis:

• Moisture
  9.50%
  
  
• Volatile matter
  1.60%
  
  
• Fixed carbon
  90.90%
  
  
• Ash
  7.50%
  
  
• Sulfur
  0.64%
  
  

Physical Analysis:

• 90% 3/8 inches and smaller
  
• 40-42 pounds per cubic foot