Custom Ferrules are made of alumina or zirconia ceramics, with inside diameters from 80 microns to 1100 microns, in lengths from 2. 5mm, and with features such as multi-step, countersinks, flats, slots, grooves, and chamfers. Ceramic ferrules and sleeves are often used in optical connectors, attenuators, fiber stubs, and other optoelectronics requiring low signal loss. The two ferrules are installed into the tail ends of the two optical fibers; the coupling sleeve plays an alignment role, and the sleeve is mostly equipped with metal or non-metallic flanges to. Ceramic Ferrules are used at the inlet of the Shell & Tube type heat exchanger to protect the tube inlets from hot gas corrosion and abrasive particle erosion. They are inserted into the ends of boiler tubes where those tubes meet a tube sheet or refractory wall, and in some designs, they extend.
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