For 20 years ADMET's focus has been on producing leading edge mechanical testing systems that are reliable, exceed ASTM/ISO accuracy requirements, and are easy to learn and use. During this time we have remained steadfast to two founding principles; a willingness to tailor our systems to meet your needs; and to provide efficient and responsive customer service; thus giving you the confidence to test with certainty.

Topics: News, Announcements, Troubleshooting

Metallic Bone Plates need to undergo several tests before gaining approval as internal fixation devices of the skeletal system. One standard, ASTM F382-99, defines the test methods for single cycle bend testing (annex A1) and for determining the bending fatigue properties (annex A2) of metallic bone plates. A summary of the test methods for annex A1 and A2 follows. For a complete description of ASTM F382-99, refer to the specification from the ASTM International organization.

Annex A1- ASTM F382-A1 measures the bending stiffness, bending structural stiffness, and bending strength from a single cycle bend test on a metallic bone plate.

Topics: ASTM Tests, Biomedical, Bend Testing, implants

Spinal Implants are tested according to several ASTM standards. ASTM F1717 is intended to provide a basis for the mechanical comparison among past, present and future spinal implant assemblies.  Three static and one fatigue mechanical test of a spinal construct are governed by ASTM F1717.  The three static tests are compression bending, tension bending and torsion.  The fatigue test is a compression bending test.  The mechanical tests are conducted using simplified loading schemes and do not attempt to mimic the complex loads of the spine.  An outline of the four test procedures is as follows:

Topics: ASTM Tests, Biomedical, implants, Biaxial, Fatigue

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.

Topics: ASTM Tests, Biomedical, Torsion, implants

ASTM D3574 (D 3574) applies to slab, bonded, and molded flexible cellular urethane foams.  There are many tests in this specification including tests for density, ball rebound, airflow, etc.  ADMET manufacturers systems that perform the following common mechanical tests in the specification:

Topics: Compression Test, ASTM Tests, Foam

Topics: ASTM Tests, Biomedical, Torsion

Typical points of interest when tensile testing a material include:
ultimate tensile strength or peak stress; modulus of elasticity, offset yield strength, which represents a point just beyond the onset of permanent deformation; and elongation at break.

Topics: Troubleshooting, Testing Tips

Topics: News, Biomedical, Adhesive

One of the most common specifications that our customers follow is ASTM D882 which is the Standard Test Method for Tensile Properties of Thin Plastic Sheeting. This test is very similar to the common ASTM D638 test whereby plastic material is pulled until in breaks in order to measure elongation, tensile modulus, tensile yield strength, and tensile strength at break. However, it is designed specifically for thin sheeting and film less than 1 mm (0.04") thick.

Topics: ASTM Tests, Plastic, Tensile Test, Film

Topics: ASTM Tests, Biomedical, Torsion, implants