The center section of five samples, each approximately 15 in. or 380 mm long, of finished conduit of the following trade sizes 3/4 and 1 were crushed between two flat, square steel plates having rounded edges and measuring 6 in (150 mm) on each side. The plates moved toward one another at the rate of 1/2 ± 1/8 in/min (10.0 ± 2.5 mm/min) until the overall diameter of the conduit was reduced to one-half its original value. The load required to crush any specimen of the conduit to half of its original overall diameter was at least as great as the value indicated in Table.