Abstract
The resistance of Technicon pump tubing to mechanical usage and chemical attack was studied for aqueous solutions rich in heteropolar organic solvents such as n-butylamine and tetrahydrofuran. The results of flow-rate measurements, over 200 h, with “tygon” (PVC), “solvaflex”, “acidflex” (black/red) and “silicone” tubing indicate that only the last is acceptable for use with the above-mentioned solvents. With the other types of tubing there is rapid solubilization, deformation or rupture of the material. A comparison carried out under identical conditions with distilled water allows the respective importance of chemical attack and mechanical usage to be assessed.
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