Aramid Fibre

• These fibres are from Aromatic polyamide, that is, nylons family.
• Aramid is derived from “Ar” of Aromatric and “amid” of polyamide.
• Examples of fibres from nylon family: Polyamide 6, that is, nylon 6 and Polyamide 6.6, that is, nylon 6.6
• These are organic fibers.
• Melt-spun from a liquid solution.
• Du Pont developed these fibers under the trade name Kevlar. From poly (p-phenylene terephthalamide (PPTA) polymer.
• Morphology – radially arranged crystalline sheets resulting into anisotropic properties.
• Filament diameter about 12  and partially flexible.
• High tensile strength.
• Intermediate modulus.
• Significantly lower strength in compression.
• 5 grades of Kevlar with varying engineering properties are available. Kevlar-29, Kevlar-49, Kevlar-100, Kevlar-119 and Kevlar-129.

Silicon Carbide Fibre (SiC)

Silicon carbide fibres are ceramic fibers. These fibres are produced in similar fashion as boron fibres are produced. The fibres are produced by two methods as follows:

• CVD on Tungsten or Carbon Core
  
  
• NICALON™ by NIPPON Carbon Japan