Nigra Black Stoneware Clay 10Kg Bag

Black Stoneware Body with Black Grog
At 1050°C and above, it develops into a dark anthracite colour.

Application Temperature:
1000°C - 1240°C

Specifications:

• Grog / Graining: 20% / 0-0.2mm

• Drying Shrinkage: 6.8%

• Firing Shrinkage:

  • 1140°C: 4.7%

  • 1190°C: 7.0%

  • 1240°C: 8.2%

• Water Absorption:

  • 1140°C: 7.3%

  • 1190°C: 3.0%

  • 1240°C: 0.2%

• Sintering (Water Absorption ≤2%): 1210°C

• Thermal Expansion Coefficient (20-400°C):68 × 10⁻⁷/K (Pre-firing: 1200°C)

·       Safety Concerns with Black Clays

·       Concerns about the safety of black clays, both in the studio and on functional ware, are valid. Historically, some black clays were colored with manganese oxide, a known toxin

NIGRA 2002 sold under the Primo-Pro label is manufactured by a reputable European supplier and widely sold throughout Europe. We have our supplier’s absolute assurance that this body (pigmented with manufactured stains) is safe to use.

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