What is the Difference Between Calcined and Vitrified Clay

Both calcined clay and vitrified clay are made from naturally occurring materials found in geographic locations throughout the country. After these materials are mined, they are processed and heated at high temperatures to stabilize their physical structure. This protects the physical integrity of the individual particles against the breakdown caused by moisture or surface management practice. These materials have a variety of applications on sports fields including topdressing infield skin areas, amending soils to reduce compaction and/or manage moisture, and absorbing excess moisture on playing surfaces.

Calcined Clay

  • Heated to 1400°F
  • High moisture-absorbing capacity
  • Release moisture slowly back into the soil
  • Have sub-angular shape
  • Effectively reduce compaction in heavy clay soils
  • Best used as:
    • moisture absorbents
    • topdressings
    • amendments to firm up high sand content (greater than 70%) infield soils
    • amendments to fractionate high clay content soils

Vitrified Clay

  • Heated to 2000° F
  • Low moisture-absorbing capacity
  • Dry quickly after wetting
  • Have sub-angular shape
  • Best used as top dressings on infield soils with less than 70% sand content
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