Load‐compression curves were taken for natural cork. The S‐shape of the curves is discussed and a theoretical fit is made for the high end of the curve, assuming an initial stiffness and an incompressible part of the cork material. A comparison is made between repeated compressions, with and without a recovery period of time.

Pressure‐volume curves were also taken and their significance discussed in connection with the load‐compression curves leading to an evaluation of Poisson's ratio.

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Dart
and
Guth
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J. App. Phys.
17
,
314
(
1946
).
2.
Synthetic rubber compound containing carbon black as used for the tread surface of tires.
3.
Jefferson Physical Laboratory, Harvard University, Cambridge, Massachusetts.
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