Masterclass: Lost Wax Without Wax – Advanced Glass Casting – Antonis Koutouzis
Course Outline
Explore the possibilities of the lost wax technique without the need of wax.
In the lost wax process, we often deal with approximate 2-3% wax shrinkage of the model to be cast, plus additional time for retouching seamlines and any imperfections resulting from pouring/brushing into the mother moulds. The inevitable steaming of the wax can, furthermore, stress and weaken refractory moulds, especially in larger projects.
In this five-day advanced glass casting Masterclass, Antonis will guide you through a complex multistep process of creating positive and negative forms in silicone to eliminate these problems, resulting in a cleaner, more efficient, and more accurate realisation of almost any shape for casting.
Over five days, participants will:
- Analyse sculptural forms and plan appropriate mould strategies
- Create a master mould
- Produce a positive form in silicone
- Develop multi-step silicone mould systems
- Construct a final refractory mould ready for casting
- Discuss casting considerations and adaptations for different forms
Due to the complexity and duration of the process, participants will not complete a fired glass piece during the masterclass. Instead, each participant will leave with a fully resolved refractory mould, which can be fired later in their own facilities or, by arrangement, at The Glass Hub.
Profile - Antonis Koutouzis

Antonis Koutouzis is a visual artist and glass fabricator specialising in cast glass techniques. He is Head of Casting at Berengo Studio in Murano, Italy, where he collaborates on projects with internationally renowned contemporary artists. He holds an MA in Glass and Ceramics from the University of Sunderland (2021) and has taught advanced glass casting masterclasses internationally.






