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The TABER® Stiffness Tester is used to assess material stiffness and material resiliency.

The TABER® Stiffness Tester provides accurate test measurements to ±1.0% for specimens with a thickness of 0.004″ to 0.219″. With the TABER® Stiffness Tester materials such as paper products, cardboard, plastics, textiles, metals, felts, tubing, wire, rubber and other sheet materials can be evaluated.

Incorporated in the TABER V-5 Stiffness Tester is a bi-directional pendulum weighing system. Providing an accurate and responsive method for measuring small load increments, this system is a critical component for determining material stiffness or resiliency. Nine (9) distinct ranges permit testing of materials that are extremely lightweight and flexible (such as cellophane or thin metallic foils) to items that are very rigid (such as plastics).

For test ranges 2 – 9, specimens are mounted on the Taber V-5 Stiffness Tester using a clamping system. Located on the pendulum, the lower faces of the specimen clamp jaws are exactly on the center of rotation. This ensures a constant test length and deflection angle for accurate and repeatable results. Both jaws of the specimen clamp are adjustable, so the test specimen can be positioned precisely in the center regardless of material thickness. Force is applied to the lower end of the specimen by a pair of rollers. The rollers, which are attached to a driving disc located directly behind the pendulum, push against the test specimen and deflect it from its vertical position.

The pendulum applies increasing torque to the specimen as it deflects further from its original position. Note: The right hand roller includes a ratchet stop mechanism that greatly reduces the potential for inter-operator error caused by over or under-tightening. The travel on the right hand assembly automatically stops when the roller contacts the specimen.

To allow the testing of materials with different stiffness properties, range weights can be applied to the Pendulum. For extremely light weight materials, a compensator range weight is mounted to the top of the pendulum. , range weights. Range weights of 500, 1000 and 2000 “Taber Units” are mounted to the bottom of the pendulum and required for stiffer materials. An optional range weight set of 3000 and 5000 Taber units is required for test ranges 7, 8 and 9.

The test point reading occurs when the pendulum mark aligns with the appropriate driving disc mark (7 1/2° or 15°), which points to the stiffness reading on the dial point. The final reading will depend on the range in which the test is being conducted (which dictates instrument set-up and the appropriate scaling factor to use). The instrument outputs the moment load applied to the test specimen in TABER Stiffness Units (g · cm).

Range 1 is used to test extremely lightweight and flexible materials whose Taber Stiffness Unit value is between 0 – 1. An optional Sensitivity Range Attachment (also referred to as SR or High Sensitivity Attachment) is used. A specimen 1 1/2″ x 1 1/2″is mounted between a set of pin holders, which replace the rollers. The specimen is only deflected to the right.