CER

Nextel 440 Ceramic Roving 111 tex / 400 filaments 400

3M ? ALUMINA-SILICA-BORIA

Manufacturer page / TDS

Description

Continuous oxide-ceramic roving. Published dielectric constant at 9.5 GHz: 2.8; loss tangent: 0.001.. Product form: Continuous ceramic roving. Thermal/service: Melting 1800°C; continuous use 1300°C at 40% strength retention. Official source: AF-3M-NEXTEL

Comparative overview

Oxide ceramic fiber — ALUMINA SILICA BORIA

Strengths: Electrically insulating, oxidation-resistant reinforcement that retains useful performance at temperatures far beyond polymer fibers and conventional composites.

When to use: Select for fire barriers, thermal shields, seals, electrical insulation and oxide CMC/PMC/MMC reinforcement in aerospace and industrial hot zones.

Key tradeoffs: Very high cost, brittle handling and specialized processing; exact retained strength differs substantially among alumina, mullite and aluminoborosilicate grades.

Qualitative ratings (1–10 scale)

Relative cost10/10 — Very high — specialized continuous ceramic fiber with demanding precursor and firing processes.
EM transparency9/10 — Excellent — electrically insulating and broadly EM transparent; used in nonconductive structural/radome composites.
Temperature / fire resistance10/10 — Extreme — oxide-stable continuous fiber with continuous-use capability up to roughly 1200–1300°C depending on grade.
Impact / penetration resistance5/10 — Moderate — intrinsically brittle, but textile forms are proven in abrasion/impact service and micrometeoroid Whipple shields.
Electrical / thermal conductivity1/10 — Very low — high electrical resistance and low thermal conductivity.
Specific tensile strength2/10 — 2/10 | 613.3 kN·m/kg | Product TDS
Atmospheric durability9/10 — Excellent — oxide ceramic fibers are essentially unaffected by UV and ambient moisture; attack is mainly associated with severe chemical or high-temperature environments.
Sustainability (CO₂e)6/10 — 12.00 kg CO₂e/kg fiber — Medium emissions — data quality: Low

Technical properties

Tensile strength1840.0 MPa
Tensile modulus190.0 GPa
Density3.0 g/cm³

Applications and processing

Aerospace; thermal structures; CMC; PMC; MMC; high-temperature structural reinforcementPMC and MMC preform manufactureWeaving; braiding; CMC

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