Clays

Todd keeps asking me if I have checked my clay recipes in Insight to see if the thermal expansion rates match my glazes.  I finally remembered to write them down.

Grolleg Porcelain:

  Grolleg Kaolin..............    51.50  
  Custer Feldspar.............    28.00  
  Flint.......................    18.50  
  Hectalite 200...............     2.00  
                              =========
                                 100.00

  *Thermal expansion: 5.94

Dan's Four Equal Parts White Stoneware:

  Tile #6 Kaolin..............    25.00  
  Hawthorne ..................    25.00  
  Custer Feldspar.............    25.00  
  Flint.......................    25.00  
                              =========
                                 100.00
  *Thermal expansion: 5.52