26-28 september 2024 - Lost Wax - Erna Piechna


Mould Construction, Casting & Lost Wax


with Erna Piechna / CH

26 - 28 september 2024




Tax included Shipping excluded

Class description:

If you are looking to bridge the gap from fusing into glass casting, then this 3 day workshop is just what you are looking for.  Erna will take you through the mould making process, step-by-step, to create reference samples using all the materials and techniques presented.  You will learn to understand the specific behaviour of each material and how this relates to your project and the glass you want to use.
  • Vermiculite and Fondu Cement - A durable slumping mould which helps to reproduce natural, flowing shapes.  You will learn how to take a negative of a model or body part with plaster bandage and then use it to build a slumping mould.
  • Lost Wax – A one-use plaster/silica mould which has wonderful properties to allow you to recreate fine detail. The model is made either of clay or wax also with undercuttings.
  • Sand and Bentonite - A flexible and inexpensive mix allowing you to spontaneously build a casting or slumping mould which affords you the most freedom to take an imprint from all sorts of objects.


Model Making

  • From clay & wax
  • preparation for open face and closed molds

Casting the Refractory Mold

  • ready made mold mixes, e.g. Hydracast & other mold mixes, strengthening
  • mixing mold materials, safety and hygiene

Choosing the Glass 

  • choosing glass components for transparency and opacity
  • determining glass quantity / weight
  • inclusions from glass and non glass materials

Charging the Mold

  • open face & closed molds


  • melting process, dealing with bubbles, annealing & cooling

Finishing & Cleaning up

  • use of hand grinding / cleaning tools

Rubbers & Silicones

  • rubber (Gelflex) & RTV silicones for negatives (demo only)


3 projects (closed and open molds):  "house", bas relief & small bowl


Skill Level: Fusing Skills are advantageous

Category: CASTING

The fee includes all materials as well as a simple lunch and beverages. We can provide tools for those who do not bring their own.

You can read our terms and conditions for classes here.


Data sheet

Course Category / Technique
2 - 3 days

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