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ShopRCA is for use by Royal College of Art students and staff only

The RCA Shops will be closed for the Christmas and New Year period between 21/12/24 - 05/01/25

ShopRCA is for use by Royal College of Art students and staff only

The RCA Shops will be closed for the Christmas and New Year period between 21/12/24 - 05/01/25

Special Porcelain 12.5kg

Special Porcelain 12.5kg

£27.55

A very smooth, high quality white porcelain clay. Containing fine white clays with a bentonite addition.

Suitable for modelling, hand building, throwing and casting.

Firing temperature range: 1220 - 1280°C

Supplied in 12.5kg bags. This is not air drying clay.

Warning - this products contain crystalline silica - If the product is allowed to dry, any powder product generated is hazardous to health by inhalation. Excessive and repeated inhalation of quartz over a prolonged period can cause chronic lung damage.

Safety Data Sheet (pdf)

Technical Information:

Si02%: 66.08

Ti02%: 0.03

AL203%: 22.47

Fe203%: 0.40

P205%: 0.10

Ca0%: 0.37

Mg0%: 0.27

K20%: 3.36

Na20%: 1.17

Total Contraction 1200°C: 15.50%

Pre Fired Total: 1220

Thermal Expansion 500°C: 0.326, 600°C: 0.447

Texture (1=smooth, 10=Coarse): 1

Fired Colour: Very White

Casting slip recipe*:

  • 12.5kg bag of Special Porcelain
  • 2 Litres of water
  • 12.5g Sodium Silicate 140s

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

We have pre-made slip available to buy - please email shop@rca.ac.uk if you're interested.

Please note this is not air-drying clay.