Trace Source^TM Disposable Tubes are short lengths of Teflon® tubing with the liquid phase of the compound sealed inside. Several versions are offered to satisfy special applications. The SRT and HRT tubes are made of different types of Teflon®. EL versions have a non-permeable reservoir that extends the operating life of the tube, and “Wafer” tubes have very small permeation areas for low rates. Disposable tubes can be used for many calibrations but cannot be refilled when exhausted.

Trace Source^TM Refillable Tubes are small stainless steel cylinders with a tubular Teflon® membrane sealed inside. In Refillable Permeation Tubes, the component compound

surrounds the tubular membrane and permeates to the inside, where it mixes with the dilution gas.