SylramicTM SiC Fibers

COI Ceramics, Inc. (COIC) is a leading supplier of high temperature SylramicTM and NicalonTM family fibers. Since 1999, COIC has manufactured ceramic matrix composites specializing in SylramicTM SiC fiber manufacturing and customer-specific CMC manufactured products.

SylramicTM SiC fiber is a 10mm diameter crystalline silicon carbide fiber. It is available in tow or woven product forms. Contact the COIC sales office for schedule and pricing information.

SylramicTM SiC Fiber

Used to Reinforce Structures Such As:

  • Ceramic
  • Plastic
  • Metal Matrix Composites

Used in Severe Environments Such As:

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

Used to Increase:

  • Part Strength
  • Toughness
  • High Temperature Creep Resistance
Property Units Ave.*
Tensile Strength (RT)
Tensile Modulus (RT)
Product Form
SylramicTM SiC fiber is a textile grade continuous tow (yarn) made up of 800 filaments with a denier of 1600. Each filament is 10mm in diameter and is coated with a polyvinyl alcohol (PVA) sizing for improved handleability.

SylramicTM SiCFiber ,Tow

  • 3" Diameter Cardboard Spools
  • <800m Length Available (145g weight)
  • Tow length may vary depending upon availability and customer requirements

SylramicTM SiC Fiber, Woven

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

Special Properties

SylramicTM SiC Fiber has excellent room temperature strength and stiffness. The fiber also 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 allows excellent wear and corrosion reisstance capability. See table below for typical properties and composition data.

SylramicTMSiC Fiber

Attribute / Property Units Typical
Diameter micron 10
Denier g/900m 1600
Filaments ea 800
Density g/cm3 >2.95
Oxygen wt% <0.5
Tensile Strength (RT) ksi >400
Tensile Modulus (RT) msi >45
Thermal Conductivity W/m-K 40-4
Composition Crystal Size (micron) %
Si:C 0.1 - 0.5 96
TiB2 0.5 3
B4C 0.1 1
Oxygen na 0.3

SylramicTM SiC Fiber Overcomes the Disadvantages of Other Materials

Oxide fibers and superalloys may lose their mechanical properties above 800C (1472F). SiCO fibers lose their mechanical properties above 1000C (1832F). Amorphous SiC fibers lose their mechanical properties above 1200C (2192F). Larger diameter (100mm), crystalline SiC fibers are not easily woven.

Safe Handling Information

Product safety information required for safe use is not included. Before handling, ready the Material Safety Data Sheet (MSDS).  A MSDS is available from COIC.


Please Call For: Technical Support, Volume Pricing and Delivery Needs!

Hugh Spilker, Manager
(801) 251-8111 or (801) 214-4820


Click the Link Below for a Brochure:

Nicalon Hi-Nicalon Hi-Nicalon Type S Sylramic