素材
Effetre Murano
Japanese: Effetre Murano（モレッティ）
COE104 glass from Murano, Italy. Widely used in lampworking, it has a high Na₂O/K₂O content, resulting in a viscosity curve shifted toward lower temperatures.
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Effetre Murano (formerly known as Moretti) is a COE 104 glass manufactured on the Italian island of Murano. Due to its high Na₂O/K₂O content, the temperature required to reach the same log η is approximately 40°C lower than that of soda-lime glass (Bullseye COE90). It is widely used worldwide for lampworking and is characterized by its extensive color selection and unique color rendering. Its annealing point is Tg = 511°C (Effetre 104).
Its use in kiln work (fusing) is limited, and COE104 cannot be mixed with other COE series. When fusing Effetre Murano in an electric kiln, you must use only COE104 materials from the same series. Since the sintering parameter Sc (crystallization temperature minus sintering temperature) is lower than that of the Bullseye series, increasing the risk of loss of transparency, extreme caution is required when using it for Pâte de Verre applications. Because it was developed as a material for lampwork, technical documentation for kiln work is limited.
Physical Data
CTE (coefficient of thermal expansion) 104 ± 1.5 × 10⁻⁷/°C (0–300°C); annealing point 470°C.
The strain point (449°C) and softening point (566°C) are values listed in secondary sources (such as distributor specifications for Wale Apparatus, Delphi, and Mountain Glass Arts) and are not official figures.
Product Features
COE 104 soft glass, rooted in the traditions of Murano, Venice. It is primarily used in the form of color rods and is widely recognized as the global standard for lampworking and torchworking.
Country of Origin
Italy (Venice, Murano Island). Formerly known as Moretti.
Related Concepts
Bullseye COE90 (bullseye-coe90) · Oceanside System 96 (oceanside-system96) ・By comparing OYF (oyf-glass), COE (coe), and the VFT equation (vft-equation), we can understand the differences in the viscosity-temperature curves of each glass type.
This entry is written in Japanese by Rei Chikaoka and translated for readers outside Japan. If something reads oddly, the original is the source of truth.