Black Stoneware Clay with Impalpable Grog
Black stoneware clay body with 40% impalpable grog (up to 80 Mesh). Formulated for artistic ceramics, it is ideal forwheel-throwing and modeling smooth pieces with fine details. The high content of grog confers an excellentbehavior during drying and firing. Its beautiful and intense black firing color in oxidizing atmosphere is very exclusiveof PRN range and becomes an ideal artistic mean of expression. In reducing atmosphere, metallic effects withshades of blue are obtained. Suitable for tableware (food-safe), according to ISO 6486.Available in extruded body (moist form).
Firing range: Cone 5-6 (2205-2269F)
Biscuit: Cone 06 (1855F)
Water content: 21%
Plasticity (IP Atterberg): 22
Carbonate content (CaCO3): 0%
Drying shrinkage: 7.0%
Firing shrinkage at Cone 6: 7.1%
Porosity (water absorption) at Cone 6: 1.3%
Dry bending strength: 4.6 N/mm2
Fired bending strength at Cone 6: 33.3 N/mm2
Thermal coefficient (a25-500C): 51.1×10-7C-1
Recommendations for use with glazes
Use zinc-free (Zn-free) glazes to prevent from unexpected reactions such as bubbling or color changes. Other elements that can react are zirconium (Zr) and tin (Sn). We recommend consulting your usual glaze supplier to ensure proper suitability with this ceramic clay body.
