Skip to content
- ShopRCA is for use by RCA students and staff only -
- ShopRCA is for use by RCA students and staff only -

Standard Red Terracotta 12.5kg


General purpose red terracotta clay, with a medium texture. Based on a blend of Etruria Marls.

Grogg has been added to this clay body (20%) which improves strength in throwing, as well as increases resistance to cracking and warping, especially on larger pieces.

Firing temperature range: 1080 - 1180°C

Supplied in 12.5kg bags.

Technical Information:

Si02%: 57.38

Ti02%: 1.23

AL203%: 22.78

Fe203%: 7.37

P205%: 0.09

Ca0%: 0.57

Mg0%: 0.86

K20%: 1.60

Na20%: 0.10

Total Contraction 1100°C: 12.30%

Pre Fired Total: 1100

Thermal Expansion 500°C: 0.319, 600°C: 0.455

Texture (1=smooth, 10=Coarse): 5

Fired Colour: Light-Dark Red

Casting slip recipe*:

  • 12.5kg bag Standard Red Terracotta
  • 2 Litres of water
  • 7g Soda Ash
  • 19.4g Sodium Silicate 140s

*This is a suggested recipe and you may need to adjust it for your own requirements and preferences.

This is not air-drying clay.