Zylon® PBO: World's Strongest Synthetic Fiber

Key Features of Zylon® PBO:

  • Excellent strength & modulus
  • Good flame resistance
  • Excellent thermal stability
  • Excellent creep resistance
  • Good chemical resistance

PBO was first developed in the 1980’s and is the world’s strongest man-made fiber.  It is also the first organic fiber whose cross-sectional strength outperforms both steel and carbon fiber.

Zylon® PBO is a rigid-rod isotropic crystal polymer that is spun by a dry-jet wet spinning process.   

FIBER-LINE® Enhancing Processes for Zylon



Common Types & Deniers
AS: Standard modulus
HM: High modulus
Deniers: 250, 500, 1000, 1500, 3000 

Zylon® (PBO) 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: Strength loss in HCl, HNO3, H2SO4 & NaCl.
Chemical Resistance to Alkali: Strong alkalis will attack at high temperature or concentration.
Chemical Resistance to Organic Solvent: Strength loss in NaOCl.

Zylon® (PBO) Data

Standard Modulus

Property UOM Value
Breaking Tenacity g/d 42.0
Specific Gravity Ratio 1.54
Elongation @ Break % 3.5
Tensile Modules g/d 1200
Moisture Regain* % 2.0
Creep** % 0
Skrinkage*** % <1.0

High Modulus

Property UOM Value
Breaking Tenacity g/d 42.0
Specific Gravity Ratio 1.56
Elongation @ Break % 2.5
Tensile Modules g/d 1800
Moisture Regain* % 0.6
Creep** % 0
Skrinkage*** % <1.0

* 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.