Sylramic™ Silicon Carbide Fiber

A 10 µm diameter crystalline Silicon Carbide (SiC) fiber with the highest temperature capability of any available SiC fiber. Sylramic™ is manufactured by COI Ceramics, Inc. (COIC) and is commercially available as tow.


Spool of Sylramic Fiber


Highest Temperature Capability of any SiC Fiber

  • 1400°C/2252°F

Increases Product

  • Strength
  • Toughness
  • Chemical Resistance
  • High Temperature Creep Resistance

Reinforces Composites

  • Ceramic (CMC)
  • Polymer (PMC)
  • Metal (MMC)

Fiber Interface Coating

  • Will recommend providers

Potentially Used For

  • Aircraft
  • Land-Based Turbine Engines
  • Hypersonic Vehicles
  • Thermal Protection Systems
  • Chemical Manufacturing



Continuous tow is supplied on 3 inch diameter cardboard spools. Lengths up to 800 meters (145 grams) are available. Tow length may vary depending upon availability and requirements.

  • 3" Diameter Cardboard Spools
  • < 800m Length Available (145g weight)


As a textile grade yarn, Sylramic™ SiC Fiber can be readily incorporated into a variety of weaves, woven tapes, braids, etc. A network of U.S. contractors exists to respond to your exact needs. Contact Us to discuss specifics and receive further information.

  • Plain Weave
  • 5 Harness Satin
  • 8 Harness Satin
  • Woven Tapes
  • Braids
  • and more

Compared to Other Materials

Sylramic™ SiC Fiber overcomes the disadvantages of other materials. Oxide fibers and superalloys may lose their mechanical properties above 800°C (1472°F). SiCO fibers lose mechanical properties above 1000°C (1832°F), while amorphous SiC fibers lose mechanical properties above 1200°C (2192°F). Larger diameter (100 µm), crystalline SiC fibers are not easily woven.

Sylramic™ SiC Fiber has excellent room temperature strength and stiffness. The fiber has excellent creep resistance, maintaining strength and stiffness for extended times at extremely high temperatures (> 1400°C / 2252°F). These fiber properties are due to its chemical composition, crystalline structure, small crystal size, and very low oxygen content. This also allows composites to have excellent wear and corrosion resistance.

Sylramic™ vs Other Fiber Materials

Material Temperature Resistance
Sylramic™ 1400°C / 2252°F
Oxide Fibers 800°C / 1472°F
SiCO 1000°C / 1832°F
Amorphous SiC 1200°C / 2192°F

Typical Properties

Characteristic Unit Typical
Diameter µm 10
Denier g/9000 m 1600
Filaments per tow 800
Density g/cm3 >2.95
Oxygen wt% <0.5
Tensile Strength (RT) ksi >400
Modulus (RT) Msi >45
Thermal Conductivity W/m-K 40-44
Composition Crystal Size (µm) %
SiC 0.1 - 0.5 96
TiB2 0.5 3
B4C 0.1 1
Oxygen -- 0.3

How Can We Help?

Our experienced team is happy to assist you! Please contact us for more information.

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