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Live Premiere for ALTRA FLEX®: RATH Presented its New Oxide Ceramic Continuous Fiber at JEC WORLD 2026
With the production of the ALTRA FLEX® oxide ceramic continuous fiber in M75, MK85, and K99 qualities, international refractory manufacturer RATH is the first European supplier to offer a solution for producers and processors of temperature-resistant fabrics and composite materials. This new oxide ceramic continuous fiber was presented live for the first time at JEC WORLD in March 2026. At the RATH booth, visitors experienced the fiber firsthand. Using hand samples, they were able to see the structure, texture, and quality of ALTRA FLEX® for themselves.
ALTRA FLEX® is outstanding in the industry and maintains both strength and flexibility up to 1200 °C. Other advantages include high thermal shock resistance, elevated creep resistance, excellent dimensional stability and low thermal conductivity. The properties, especially the retention of flexibility in extreme temperature ranges, open up many possibilities. The roving is ideal for fabrics, composites, weaving, braiding and more. These product properties make ALTRA FLEX® a future-oriented material in many industries and fields of application.
Key precursor for the production of oxide ceramic matrix composites
Oxide ceramic continuous fiber is widely used, especially as reinforcing fibers in various matrices (CMC, MMC). Due to its high tensile strength and stiffness as well as its excellent chemical and thermal resistance, continuous fiber can, for example, provide ceramic matrices with quasi-ductile, damage-tolerant fracture behavior. This continuous fiber is an important key precursorfor the production of oxide ceramic matrix composites.
High-performance fiber structures: MK85, M75, K99
The fiber, produced using the sol-gel process with a dry spinning technique, has a pure mullite or corundum microstructure after its thermal treatment, while in the MK85 grade, both phases are present in parallel. To date, RATH has developed the mullite fiber M75 (with an elevated creep resistance as well as a tensile strength of up to 1,500 MPa and a modulus of elasticity of 200 GPa), the mullite-corundum fiber MK85 (with a tensile strength of up to 1,900 MPa and a modulus of elasticity of 230 GPa) and the corundum fiber K99 (with a tensile strength of up to 2,500 MPa and
a modulus of elasticity of 350 GPa).
ALTRA FLEX® is a product of RATH R&D and was created as part of the HORIZON EUROPE project InVECOF (Innovative Value Chains for European Ceramic Oxide Fibers). It is manufactured at the RATH plant in Mönchengladbach (Germany). More information:
www.rath-group.com/altraflex
