Employing the principle of cantilever bending, a rectangular specimen is supported on a smooth low-friction horizontal platform. A weighted slide is placed over the specimen and advanced at a constant rate. As the leading edge of the specimen projects from the platform, it bends under its own weight. The bend angle indicator can be set at either 41.5° (0.724 rad) or 45° (0.785 rad) below the plane of the platform surface, and includes an easy to read bend angle reference scale with 5° graduations. Once the material flexes enough to touch the bend angle indicator, the test is stopped. Using a scale calibrated in both metric and English units, the length of the overhang is then measured and flexural rigidity and bending modulus can be calculated.
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