Rokk Grey Grogged Stoneware has been developed for sculptural applications and for outdoors pieces, the high grog content (40% fine grog 0-0.5mm) providing a beautiful textured surface and excellent handling qualities. Depending on the firing temperature this body takes on a range of grey hues. To retain a 'cool grey', fire at 1200C or below. The grey hue can become 'brownish' above this temperature and certain glazes will emphasise this.

Firing range: 1200-1300ºC

Biscuit temperature: 1000ºC

Water content: 17%

Plasticity (IP Atterberg): 16

Carbonate content (CaCO3): 0%

Drying shrinkage: 5.5%

Firing shrinkage (1300ºC): 3.9%

Porosity (water absorption at 1300ºC): 2.6%

Dry bending strength: 2.5 N/mm2

Fired bending strength (1300ºC): 37.8 N/mm2

Thermal coefficient (25-500ºC): 59.9x10^-7ºC^-1"