Black Sculpture Clay
PRNF is a black sculpture clay body with 40% fine grog (up to 35 Mesh). Formulated for artistic ceramics, it is ideal for sculpture.
The high content of grog confers a beautiful textured surface and an excellent behavior during drying and firing. Its beautiful and intense black firing color in oxidizing atmosphere is unique to the PRN range and becomes an ideal artistic mean of expression. In reducing atmosphere, metallic effects with shades of blue are obtained.
PRNF is available in extruded body (moist form), in a 27.6 lb. package.
Firing range: Cone 5-7 (2205º-2295ºF)
Biscuit: Cone 06 (1855ºF)
Water content: 21%
Plasticity (IP Atterberg): 22
Carbonate content (CaCO3): 0%
Drying shrinkage: 7.0%
Firing shrinkage at Cone 7: 4.5%
Porosity (water absorption) at Cone 7: 9.4%
Dry bending strength: 2.0 N/mm2
Fired bending strength at Cone 7: 27.5 N/mm2
Thermal coefficient (a25-500ºC): 55.8x10-7ºC-1