素材
Kugler Colors
Japanese: クーグラー（Kugler Colors）
A German manufacturer specializing in colored glass. The company sets the global standard for colored rods and frit used in glassblowing, and operates as a family-run business with handcrafted production.
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Kugler (Spezialglashütte Kugler Colors GmbH) is a German manufacturer specializing in colored glass. The company supplies colored rods, frit, and powder to artists and studios around the world for use in coloring hot glass (blown glass and lampwork). It is a family-run business with a long history that relies primarily on handcrafted production.
In the world of blown glass, it is so widely used that people say, “When it comes to color, it’s Kugler,” and it is routinely used in major hot shops in English- and German-speaking regions, such as European studios and the Pilchuck Glass School in the United States.
Physical Data
The coefficient of thermal expansion (COE) is generally 96 ± 4 × 10⁻⁷/K (average value). There is some variation, ranging from 91 to 95 for transparent colors and 83 to 86 for opaque colors. Some lines also have a COE of 104.
The standard dimensions for color bars are generally 30 mm in diameter by 300 mm in length.
Product Features
It is primarily used for hot glass (blown glass and lampwork). It comes in a very wide range of colors, including transparent, opaque, and reactive varieties. Because it is hand-blown, subtle variations may occur depending on the batch and color.
Country of Origin
Germany.
Note
Although COE 96 is the primary type, there is a range in thermal expansion between transparent and opaque varieties. Even when combining different types of glass from the same manufacturer, testing is recommended. It is sometimes used in combination with other manufacturers’ COE 96 series products (such as Oceanside System 96).
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.