Compressive strength was measured on a Instron 4201
universal testing frame. Foam specimens were securely
fastened lengthwise and compressed by a metal probe
(6 mm diameter) with a hemispherical endcap at a crosshead
rate of 30 mm/min for a distance of 3 mm. At that point the
crosshead was stopped and the compressive strength
determined by dividing the maximum load by the crosssectional
area of the probe