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What is high fire slip?

What is the difference between low fire & high fire clay?



The difference between them is the temperature at which the clay matures (fuses) and glazes (melt). All "bisque" ware is the same, as far as the "bisque" finish goes (both clays fired to cone 04).

Low fire and high fire are relative terms that relate to breaking up the vast range of firing temperatures that are most often used in ceramics. In very basic terms low fire clay is referring to clays that are often: earthenware, terra-cotta and/or sculpture formulations; where as the term high fire is usually used in describing: stoneware, dinnerware and porcelain clays.

low fire cone 06 - 04 (hobby ceramics, earthenware) Pours smoothly & quickly, drains evenly, produces greenware of good strength. high fire cone 6 (stoneware) A smooth pouring stoneware slip. Releases easily. Excellent for utility ware.

Pottery vitrifies when the heat is very high. It hardens, becoming tighter and stronger as a result. Low fire does not encourage complete vitrification. The result is pottery that is not as strong as high-fired pieces. The pieces are not completely fused, making intricate pieces more fragile. High fire allows for full fusing of all pieces, complete hardening and a glass-like finish (once re-fired, not in bisque state).

Most of the ceramic bisque available on-line or in shops, is done in low fire slip. Low fire is the most common used slip for statuary items. High fire is more common for dinnerware items. We have made it so both types are available for any of the items that we make.


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