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Plastic Vitrox

White Burning Plastic Feldspar

Chemistry

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PV Clay - Related
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Miscellaneous

Family: Feldspar
Region: North America
Mined At: Unspecified
Raw Mineral: No
Generic: No

Notes

See PV Clay.

(Richard Willis)

A California feldspathic earth, usually packaged under the label PVC for “Plastic Vitrox Clay”, that is similar in makeup to Cornwall Stone but fires whiter. It is preferred by many for use in white clay or glaze formulas where kaolin or a “white clay” is called for.
Typical empirical analyses are SiO₂ 75.56%, Al₂O₃ 14.87%, Fe₂O₃ 0.09%, CaO 0.22%, MgO 0.20%, Na₂O 0.29%, K₂O 6.81% and CaO 1.00%, K₂O 5.00%, MgO 0.50%, Na₂O 0.90%, TiO₂ 0.10%, Al_2
>O₃ 12.70%, SiO₂ 76.50%, Fe₂O₃ 0.50%
A well-behaved casting slip for cone 8 or lower can be made of 1 part PV to 3 parts talc and 2 parts ball clay. A simple cone 6 glaze can be made of 1 part PV to 1 part borocalcite (2CaO.3B₂O₃_.5H₂O).

Authors

Tony Hansen (Owner)

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