AT431 Elongational Stress Tester is used to determine the elongational stress as a characterization of the melt viscosity of PE-UHMW molding or extrusion materials. This instrument complies with the following international and industry standards. ISO: ISO 11542.2. GB/T: GB/T 21461.2. Independent test of 6 working positions, easy to operate, accurate and reliable, high efficiency. Sample holder has a braking device and 90mm limiter, convenient to operate. Unique lifting device to make sample holder up and down, stable and reliable. Equipped with automatic exhaust system, no environmental pollution during the test. With temperature protection circuit which is independent of the control system, to prevent fire accident. Program control test operation, self-timing to release braking device, automatically start timing, automatically record elongational time. The professional software automatically create elongational stress-time double logarithmic curve, built-in linear regression algorithm, automatically calculate the elongational stress F(150/10). The professional software automatically creates displacement-time curve, temperature-time curve, analyze the whole elongation procedure, and also store & file test data.