Magnesium Sulphate (Epsom Salts)
Brand: Potclays Materials
3442 Magnesium Sulphate Also known as Epsom Salts. Used to flocculate glazes to assist suspension ...
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.