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Calcium Chloride


Formula: CaCl2.5H2O

Used as a flocculating agent in glazes (to suspend and gel them). For many, especially larger manufacturers, it is the product of choice (more effective than epsom salts and vinegar). It works well with glazes containing bentonite or carbonates. This material is the key to being able to apply a glaze to non-porous porcelain bisque ware, the slurry stays in place after application because of the gel state.

Usually small additions (.1-.3%) added to glaze slurries are sufficient to produce gelling. But sometimes higher, or considerably higher, percentages are needed (which may be an important consideration if small amounts of epsom salts would work).

One of our users reported that using Calcium Chloride in glazes containing bone ash can cause a hardpan to precipitate.

Calcium Chloride (CaCl2) is inexpensive and can be sourced from online chemical stores (e.g. Carolina.com; it may be listed as hazardous, placing restrictions on shipping). Pool supply places sell it as an adjuster for water hardness (keeps the acids they put in pools from attacking the pool plaster). Calcium chloride is used on sidewalks as an ice-melter in cold climates.


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By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Calcium Chloride" descrip="Flocculant" searchkey="" loi="0.00" casnumber="139468-93-2"> </material>

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