Soda-lime glassrod produced by Double Helix, Zephyr is a clear glass that has been formulated to melt smoothly and easily whilst resist boiling and scumming. It has a low reactivity with silver lusters, and exhibits a low seed count together with a pristine surface due to careful handling.

Double Helix glass is compatible with all Effetre, Vetrofond and Precision 104 colours.
Glass for flamework: beads and spun glass.

Coefficient of expansion (COE) 104
Annealing temperature: 470°C (878°F)