This is a 50 pound box of clay. The website will only process one 50 pound box of clay to ship in a USPS Large Flat Rate Box per order at this time.
#20-G has the same properties as #20 with a fine grog added for slightly less shrinkage and improved work-ability.
Wet Color: Red
Firing Color: Oxidation: Terra Cotta - Reduction: N/A
Texture: Medium Coarse
Penetrometer Target: 7.5
Avg. Shrinkage ±2%: 8.0%
Avg. Water Absorption ±1%: 11.5%
COE x 10-6: 4.80
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