WE-ST Conductive Fiber Würth Elektronik WE-ST Conductive Fiber is extremely light and strong, with a conductive nylon weave. The WE-ST is also extremely flexible, has heat-resistant EMC network tubing, and an operating temperature of –60°C to +160°C. Würth Elektronik WE-ST Conductive Fiber is suitable for optimal EMI protection for wires, cables, cable trees, lines, and cable bunching.