SIO-2® PRAF White Sculpture/Raku Clay with Fine Grog, 27.6 lb


Price of clay also includes bisque firing, glazes, and glaze firing of your work. No clay may be brought into the School from an outside source.

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Frequently Bought Together

Total price:$65.00

PRAF is a white sculpture and Raku clay body with 40% fine grog (up to 35 Mesh). Formulated for artistic ceramics, PRAF is ideal for sculpture, murals and Raku pieces.

The high content of grog confers a beautiful textured surface and an excellent behavior during drying and firing. Its particular ivory color after firing is unique and provides an excellent ware for glazes and coloring oxides, which develop bright and intense tones. It is also known as “Rafael” clay, and it is very popular because of its excellent behavior for Raku.


Firing range: Cone 6-10 (2269º-2381ºF)
Biscuit: Cone 06 (1855ºF)
Water content: 17%
Plasticity (IP Atterberg): 16
Carbonate content (CaCO3): 0%
Drying shrinkage: 5.4%
Firing shrinkage at Cone 10: 4.6%
Porosity (water absorption) at Cone 10: 4.1%
Dry bending strength: 2.4 N/mm2
Fired bending strength at Cone 10: 26.2 N/mm2
Thermal coefficient (a25-500ºC): 55.9x10-7ºC-1