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Brand: Potclays Materials

3442 Magnesium Sulphate Also known as Epsom Salts. Used to flocculate glazes to assist suspension ...

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20 Kg in stock

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£3.58
7.16 per unit) (Ex. VAT)

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3442 Magnesium Sulphate

  • Also known as Epsom Salts.
  • Used to flocculate glazes to assist suspension and application to relatively vitreous biscuit ware. 
  • Usually only about 0.1% is needed, but up to 0.5% can be used with particularly troublesome slurries.

INSTRUCTIONS FOR USE

  • Make up a saturated solution with warm water
  • Add a single teaspoon of the solution to the glaze slop and stir well.
  • Continue to add a teaspoon at a time, stirring well after each addition, until you see the consistency change (becomes creamy).
  • As a general guide, one teaspoon should be sufficient for 5lt glaze slop.

TECHNICAL NOTES: Epsom Salts work by flocculating the clay content of a glaze.  The lower the clay content, the less effective the flocculant.  In order for a flocculant to work effectively, more clay should be added: As a general rule we always advise customers to add at least 3% bentonite to all earthenware and/or fritted stoneware glaze in addition to the Epsom salts. Also, in glazes which are self-deflocculating (ones containing high alkali frit, large amounts of soda feldspar or nepheline syenite) much larger additions of Epsom salts are required to overcome the self-deflocculation.

Volumetric weight:1.000