In the world of materials, ZOLTEK PX35 has emerged as the industrial carbon fiber –one that is both affordable and delivers a strength to weight performance equal to or better than many “aerospace’ grades. It is made from our abundant textile-based precursor and manufactured in a proprietary high-throughput process which results in affordable fiber without sacrificing strength or stiffness.

ZOLTEK PX35 is the low-cost commercial carbon fiber that has revolutionized the carbon fiber industry and paved the way for carbon fiber to break into a variety of new applications. Our sustainable pricing structure is independent of the volatile aerospace industry, and is designed to compete with other primary building materials.


Spool-to-Spool Consistency — By vertically integrating the process from precursor manufacturing to carbonization and maintaining ISO 9001:2008 ad AS9100 certifications, ZOLTEK PX35 continues to exhibit superior levels of consistency from spool to spool for critical properties and characteristics.

Composite Properties


Tensile Strength

600 ksi

Tensile Modulus

35 msi

Electrical Resistivity

0.00061 ohm-in


0.065 lb/in3

Fiber Diameter

0.283 mils

Carbon Content



397 ft/lb

Spool Weight

12 lb, 24 lb

Spool Length

1650 yd, 3280 yd