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Powdered Clays

The recipe we generally recommend for making up a casting slip from powdered clay is:- 25kg powdered clay -- 35-87.5g* sodium silicate 120tw -- 30g soda ash -- 10lt water *sodium sili… Read more

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Buff Earthenware/Stoneware Powder 1110-1285C

Buff Earthenware/Stoneware Powder 1110-1285C

Potclays Clays 190-1118 - In stock
£3.90 per 1kgs (Inc. VAT) £3.25 per 1kgs (Exc. VAT)
HF Porcelain Powder 1220-1290C

HF Porcelain Powder 1220-1290C

Potclays Clays 190-1149 - In stock
£7.34 per 1kgs (Inc. VAT) £6.12 per 1kgs (Exc. VAT)
Low Temperature Earthenware Powder 1020-1180C

Low Temperature Earthenware Powder 1020-1180C

Potclays Clays 190-1000 - In stock
£7.09 per 1kgs (Inc. VAT) £5.91 per 1kgs (Exc. VAT)
Porcelain Powder 1170-1220C

Porcelain Powder 1170-1220C

Potclays Clays 190-1146 - In stock
£7.15 per 1kgs (Inc. VAT) £5.96 per 1kgs (Exc. VAT)
White Earthenware Powder 1110-1260C

White Earthenware Powder 1110-1260C

Potclays Clays 190-1140 - In stock
£5.87 per 1kgs (Inc. VAT) £4.89 per 1kgs (Exc. VAT)
White Stoneware Powder 1210-1300C

White Stoneware Powder 1210-1300C

Potclays Clays 190-1145 - In stock
£6.52 per 1kgs (Inc. VAT) £5.43 per 1kgs (Exc. VAT)

Powdered Clays

The recipe we generally recommend for making up a casting slip from powdered clay is:-

25kg powdered clay -- 35-87.5g* sodium silicate 120tw -- 30g soda ash -- 10lt water

*sodium silicate (deflocculant) addition will need to be adjusted accordingly to achieve correct fluidity. Too much deflocculant can have the reverse effect on a casting slip, causing it to thicken, so it is best to add it gradually, mixing all the while. Fine-tuning the fluidity is best achieved with sodium dispex.

If you can find a copy (it is currently out of print), we would highly recommend the book Ceramic Faults & Their Remedies which gives lots of useful information on slipcasting and the issues you may come up against.

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