Abstract
It was found that expanded polytetrafluoroethylene tubes easily absorbed water, saline, ringer and heparin solutions when they were immersed in these solutions and the pressure of the container was decreased and increased repeatedly.
The degree of absorption increased with the increase of fibril length of the sample and with the number of cyclic change of pressure. The saturated value of absorption was smaller in the order of heparin, ringer, saline and water.
Considerable amount of absorbed heparin remained even after the sample was exposed in the running water for a few days.
