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L6 - Plaster Moulds

Wednesday 10 April 2019 - 1 day course

It is impossible to produce saleable items from plaster moulds if the moulds are in any way faulty.

This module describes:

  • How plaster is produced from gypsum rock
  • The storage and ageing of plaster
  • Measuring the properties of plaster
  • The plaster water blending process
  • The physical effects of early and late poured plaster
  • Vacuum blending
  • Mould drying
  • Measuring mould properties
  • Mould making best practice tips
  • The effect of mould properties on ware quality (case studies).

The practical session will include:

  • Making specimen moulds at various pouring times and plaster to water ratios
  • The use of the mould permeability apparatus
  • A demonstration of plaster tests
  • Mould faults (case studies).

At the end of the module, you will be able to understand:

  • The basics of how gypsum is processed to make plaster
  • The ageing process
  • Best practice for making mould
  • Best practice for drying mould
  • Solving common mould faults
  • Solving common ware faults that arise from plaster mould issues.

For more information on this course, please contact Caroline Mullington, Technology Partnership Manager on +44 (0)1782 764422 or

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