Current ceramic ferrules are typically composed of either alumina or zirconia, with the former typically having higher hardness, wear resistance and KIC fracture toughness than its zirconia counterpart; however, its lower KIC fracture toughness makes it more vulnerable to damage . Current ceramic ferrules are typically composed of either alumina or zirconia, with the former typically having higher hardness, wear resistance and KIC fracture toughness than its zirconia counterpart; however, its lower KIC fracture toughness makes it more vulnerable to damage . Ferrule materials determine the mechanical precision, optical alignment, thermal stability, and long-term reliability of fiber optic connectors. A ferrule's job is to hold the fiber core in perfect concentric alignment while maintaining extremely tight tolerances according to IEC 61755, IEC 61300. Ceramic ferrules and sleeves are often used in optical connectors, attenuators, fiber stubs, and other optoelectronics requiring low signal loss. Ceramic ferrules are well known for having high durability and the highest levels of dimensional control, making them suitable for use. Thorlabs offers Ø1. 5 mm stainless steel or ceramic (zirconia) fiber optic ferrules for constructing pigtailed fiber optic patch cables and assemblies. Pick the right ferrule type (PC, UPC, APC) for your network to help it work better. Rosen offer various shapes of ceramic ferrules. Include single mode ferrule,multi mode ferrule,special inner.