There are several ASTM and ISO specifications that require Torque Testing;ISO 594-1, ASTM F543, ASTM 2502, F1541, and A938. There are also many medical device companies that could use a torsion testing system for R&D and prototyping. Many times, the axial forces are low, and the torque capacity is less than 50Nm. ADMET's 81T Torsion Tester comes in 1-100Nm capacity with dead weight pulley system to offset or to apply load to the sample. A Biaxial configuration, for both linear and torsional control, is available in single or dual column configurations at an additional cost.

     eXpert 3600 Biaxial Testing

The Orthopedic Tissue Engineering and Materials Lab at the University of North Carolina Charlotte (UNCC) was the winner of ADMET, Inc's 20 year anniversary celebration biomedical testing system giveaway. Drs. Ahmed El-Ghannam and Nigel Zheng at UNCC head a research team involved with the use of bioactive ceramic and bioactive ceramic-polymer composites as orthopedic fixation devices.  To fulfill their testing needs, ADMET has awarded the team an eXpert 81T 20 Nm (177 in-lb) Vertical Torsion Testing System equipped with the PC based MTESTQuattro® Materials Testing System and an immersion bath.

Annex A1 is used to measure torsional yield strength, maximum torque and angle at break for metallic bone screws. A description of the ASTM F543-A1 test procedure is as follows:

ASTM F543 Annex A2 is used to measure the torque required to drive a bone screw into a test block made of a rigid unicellular polyurethane foam. The results obtained from this test bear no direct correlation to the torque required to insert a bone screw in human or animal bone. This method is used as a quality control check for maintaining product uniformity.