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Bentonites
"A highly plastic clay originating in the decomposition of volcanic ash. It is extremely fine and can be dispersed widely through bodies and glazes, in which it is used to impart plasticity and an ability to keep a glaze slop in suspension. Up to 2% can be safely added to all bodies and will improved plasticity. Up to 1% can be safely added to glazes and the slop water made slightly acidic by the addition of calcium chloride solution."
- The Potter's Dictionary of Materials and Techniques
Products In This Category
 The most commonly used bentonite, and is considered a standard glaze and clay additive. It can at times be coarser than 325 mesh, and may cause some specking if used in amounts over 1%. A Sodium Bentonite.
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A non-swelling Calcium bentonite and our lightest colored Bentonite. Excellent for use in clay bodies, especially in conjunction with Macaloid in porcelains.
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(Air Purified) Ultra-fine ground, air-purified Bentonite recommended when a finer grade than 325 is needed for glaze applications.
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A suspension agent that increases the drying rate of water suspended glazes. It is similar to a very clean, white type of Bentonite. Also used as a plasticizer in fine porcelain.
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A macaloid-type Bentonite suspension agent for glazes. Also used as a surface hardener. An extremely plastic, hydrous magnesium silicate used to give plasticity to non-plastic whiteware and refractory bodies. Very similar to Macaloid.
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A macaloid-type Bentonite suspension agent for glazes. Also used as a surface hardener. An extremely plastic, hydrous magnesium silicate used to give plasticity to non-plastic whiteware and refractory bodies. Very similar to Macaloid.
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