Chromatography

  • Dynacal Perm Tubes with Certified Permeation Rates Traceable to NIST for Precise Results

Dynacal Perm Tubes with Certified Permeation Rates Traceable to NIST for Precise Results

Oct 10 2018 Read 1106 Times

Dynacal permeation tubes, or ‘perm tubes’, are small, inert capsules containing a pure chemical compound in a two phase equilibrium between its gas phase and its liquid or solid phase. Held at a precise, constant temperature in the permeation chamber of a Dynacalibrator, the device emits the compound through its permeable portion at a constant rate. Permeation rates are certified using standards traceable to NIST by the most basic and accurate laboratory procedure - measuring the gravimetric weight loss over a known time at a known temperature.

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