The GESTER GT-C39A Zipper Fatigue Tester is the industry-standard equipment for determining the reciprocation resistance and long-term durability of slide fasteners. By driving the zipper through continuous back-and-forth cycles under lateral and longitudinal tension, it evaluates physical wear, fluffing, joint displacement, and connector failure. Equipped with an LCD counter and automated machine stop, the GT-C39A provides a highly accurate, cost-effective testing baseline compliant with global standards like BS 3084, EN 16732, ASTM D2061 and SATRA TM50.

The GESTER GT-C39C Zipper Reciprocating Fatigue Tester is a niche, precision-engineered apparatus built exclusively to evaluate the repeated opening and closing resistance of slide fasteners destined for heavy-duty footwear and leather goods. Unlike universal light-textile testers, the GT-C39C is tailored strictly to satisfy the rigorous requirements of the SATRA TM50 Method 1 standard. This dedicated setup simulates the extreme lateral tension, heavy leather stiffness, and high-load mechanical drag experienced by boot and luxury leather zippers, delivering flawless diagnostic benchmarking where standard textile machines fail.

The GESTER GT-C39B Zipper Rotation Testing Machine is a highly specialized mechanical tester engineered explicitly to measure the torsional strength, twist tolerance, and torque degradation of zipper sliders and pullers. Supporting advanced interactive operational modes—including twist-off, constant angle, and constant load—it isolates the exact mechanical failure thresholds of slider bodies and pull-tab joints. Equipped with a touch-screen control panel and heavy-duty stainless steel fixtures, the GT-C39B ensures precise data logging to satisfy strict hardware-focused safety benchmarks including ASTM D2061, 16CFR 1500.51-53, and EN 16732.