Grey Speckled Stoneware WMS-2005GG

From the manufacturers website:

This fine-grogged, cement-coloured stoneware body features spots that become visible at temperatures above 1150°C. Suitable for throwing and hand-building small pieces.

Application Temperature:
1000°C - 1250°C

Specifications:

• Grog / Graining: 20% / 0-0.5mm
• Drying Shrinkage: 5.3%
• Firing Shrinkage:
  • 1150°C: 3.0%
  • 1200°C: 4.8%
  • 1250°C: 5.2%
• Water Absorption:
  • 1150°C: 5.5%
  • 1200°C: 3.0%
  • 1250°C: 1.8%
• Sintering (Water Absorption ≤3%): Approx. 1200°C
• TEC (20-400°C): 64 * 10⁻⁷/K (Pre-firing: 1200°C)