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 Equipment: ball-interfaced and anvil interface micrometer, deflectometer, conditioning chamber, environmental test chamber are recommended but not required.

Apparatus: The machine will have a stationary and movable head, the machine should be able to indicate the total force being carried by the test specimen, it will either be a 3- or 4-point bend test. Below is what they used

Test at least five specimens.

Condition the specimen in a chamber if the test environment is not the same as a conditioned environment.

  Measure the length, width and thickness at three places in the specimen.

Place the specimeninto the test fixture and align the fixture so the longitudinal axis of the specimen is perpendicular (within 1 degree) to the longitudinal axes of the loading bars, the bars must also be parallel (within 1 degree) to the plane of the specimen facings.

  Attach  Attach the deflection transducer.

Apply a compressive force to the specimen until failure or until a deflection equal to the thickness is reached.

It was noted that the speed of testing should be around 6mm/min. 

Failure should occur at 3-6 minutes.