Sio-2 black PRNI stoneware clay with 40% impalpable grog 0-0.2 mm (up to 80 Mesh). Formulated for artistic ceramics, it is ideal for wheel-throwing and modelling smooth pieces with fine details. The high content of grog confers an excellent behaviour during drying and firing. It's beautiful and intense black firing colour in oxidising atmosphere is very exclusive of PRN range and becomes an ideal artistic mean of expression. In reducing atmosphere, metallic effects with shades of blue are obtained. Suitable for tableware (food-safe), according to ISO 6486. Available in extruded body (moist form).

• Firing range: 1200-1240ºC / Cone 5-6
• Biscuit temperature: 1000ºC / Cone 06
• Water content: 21%
• Plasticity (IP Atterberg): 22
• Carbonate content (CaCO3): 0%
• Drying shrinkage: 7.0%
• Firing shrinkage (1240ºC): 7.1%
• Porosity (water absorption at 1240ºC): 1.3%
• Dry bending strength: 4.6 N/mm2
• Fired bending strength (1240ºC): 33.3 N/mm2
• Thermal coefficient (25-500ºC): 51.1x10^-7ºC^-1

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Quantity pricing (quantities may be achieved by mix and matching with any Sio-2 Specialty Clay):

10+      5% off

Brand SIO-2 
Firing: Ceramic kiln high fire 
Weight/Volume: 12,5 kg 
Grog: Impalpable grog 
State: Moist form (plastic body) 
Stiffness: 4 throwing and modelling

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.

Caution
PRNI clay is sensitive to cooling. It is recommended not to open the kiln until it is cold (<100ºC) to avoid cooling breaks, especially in flat and thin pieces.

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Note: Protect from Freezing.