Electromechanical, or universal testing machines, are most commonly used for static testing in a tensile or compression mode within a single frame. They are also referred to as pull testers. Additional test types include tension, compression, shear, flexure, peel, tear, cyclic, and bend tests. Capacities for these systems range from low-load forces of 0.5 kN (112 lbf) up to high-capacity 600 kN (135,000 lbf) test frames.
Instron features two tiers – the 5900 Series for advanced testing requirements typically found in R&D and product development labs; and the 3300 Series – an affordable line suitable for Quality Control (QC) labs and production environments. These systems are frequently configured for automated testing. In addition to the testing equipment, specimen preparation is an extremely important factor to consider when evaluating the repeatability of results. Specimens with nicks, cuts, and non-parallel edges will have an adverse impact on repeatability of results.