Kevlar® Para-Aramid: Lightweight, Durable, and Strong

Key Features of Kevlar®

  • High strength to weight ratio
  • Low elongation to break
  • Good heat & flame resistance
  • Good chemical resistance
  • High cut resistance
  • Excellent ballistic properties


Kevlar® was first developed by chemist Stephanie Kwolek at DuPont™ in the 1930's.  It was first commercially used in the 1970’s as a replacement for steel in racing tires.

Kevlar® Para-Aramid is an aromatic polyamide that is characterized by long rigid crystalline polymer chains.  “Para” refers to the specific linkage position of the aromatic rings.  Longitudinal alignment of the hydrogen bonds enables high tensile strength and modulus.

FIBER-LINE® Enhancing Processes
 for Kevlar®:

Kevlar® Products:


Common Types & Deniers
T-29: Standard Modulus
T-49: High Modulus
AP: 15% higher tenacity than T-29
KM2: Optimized ballistic resistance
Deniers:  200, 380, 400, 750, 800, 1000, 1420, 2160, 2250, 2840, 3000, 7100

Kevlar® Para-Aramid Bare Fiber Performance

Abrasion Resistance
Yarn on Yarn Abrasion
Ultraviolet (UV) Resistance
Flame Resistance
Chemical Resistance (Acid)
Chemical Resistance (Alkali)
Chemical Resistance (Organic Solvent)

Chemical Resistance to Acid:
Degrades in Formic, Hydrochloric and Sodium Hydroxide acid.
Chemical Resistance to Alkali: Strong alkalis will attack at high temperateure or concentration.
Chemical Resistance to Organic Solvent: Degrades moderately in Carbon Tetrachloride and Ethylene Glycol/Water.

Kevlar® Para-Aramid Data

Standard Modulus

Property UOM Value
Breaking Tenacity g/d 23.0
Specific Gravity Ratio 1.44
Elongation @ Break % 3.5
Tensile Modules g/d 555
Moisture Regain* % 5.0
Creep** % <0.03
Shrinkage*** % <0.02
Melt Point None
Decomposition Temp. 425-480

High Modulus

Property UOM Value
Breaking Tenacity g/d 23.6
Specific Gravity Ratio 1.44
Elongation @ Break % 2.5
Tensile Modules g/d 885
Moisture Regain* % 5.0
Creep** % <0.03
Skrinkage*** % <0.02
Melt Point None
Decomposition Temp. 425-480

* Equilibrium moisture regain @ 55% RH    ** Creep @ 40%-58% ultimate tensile strength    *** Shrinkage in dry air @ 177 C for 30 minutes

This data is provided for informational purposes only, and does not constitute a specification. FIBER-LINE makes no warranty, express or implied, that the product conforms to these values. Contact your FIBER-LINE representative for exact product details which conform to your specific requirements.