These flame-sealed cells contain 600 Torr of >99.9% pure ethane (C₂H₆) at room temperature. They are used for calibration of tunable lasers around 2750-3275 cm^-1 (3050-3650 nm) with a high density of well characterized lines in the alkane C-H stretch region.

The quartz cell body is cylindrical in shape; outer diameter 10 mm; length 75 mm. The tipoff stem is centered on the cell, protruding not more than 8 mm from the cell body. Windows are angled 11° off of normal and have a 2° interior wedge to prevent back-reflection and etalon effects.