Zoltek Corporation

Manufacturer of Panex and Pyron carbon fiber products for reinforcement, electrical conductivity, fire resistance, friction and carbon/carbon applications. Product forms include continuous tow, chop, mill, pellet, fabrics, felt, yarns, nonwovens and prepregs.

Phone: (314)-291-5110
Fax: (314)-291-8536

Sales Contact:
John Kowalik, (314) 291-5110,

Please visit: Zoltek Corporation

Mailing Address
3101 McKelvey Rd.
St Louis, MO 63044 US

Additional Locations:
CHINA 535 Shen Xu Rd.
Suzhou, CN
+15 82 9185298

SINGAPORE, 54 Genting Lane 06-01, Ruby Land Complex, Block 2
Singapore, 349562 SG
+65 9002 6380

KOREA Rm. 905, 101 Dong, Yesung Uptopia, 186-7 Guro-gu
Seoul, KR
+82 2 785 0435

INDIA G-12 Ground Floor, Metro House, Mangaldas Rd.
Pune, IN
+91 976 9901 324

Nyergesujfalu, HU
+36 33 536 021


Zoltek's commercial grade carbon fibers are sold under the PANEX® trade name and our oxidized PAN fibers are sold under the PYRON® trade name. Our PANEX® and PYRON® fibers are available in many different standard forms, and customizations are available upon request. If you have any product related questions or comments, please feel free to contact us at

  • Fibers, organic
    • Carbon, PAN-based
    • Other organic fibers
  • Reinforcements, unimpregnated
    • Carbon
      • Carbon, Chopped strand
      • Carbon, Milled fibers
      • Carbon, Roving, gun
      • Carbon, Yarns
      • Carbon, Other
    • Other unimpregnated reinforcement forms
      • Other, Chopped strand
      • Other, Mat, chopped strand
  • Fabrics, unimpregnated
    • Carbon
      • Carbon, 8-harness
      • Carbon, Multiaxial
      • Carbon, Plain-weave
      • Carbon, Stitched (knitted, nonwoven)
      • Carbon, Twill
      • Carbon, Woven roving
      • Carbon, Other
  • Preforms, unimpregnated
    • Carbon
  • Prepregs, thermoset
    • Epoxy
      • Epoxy, 12-inch tape
      • Epoxy, 60-inch tape
      • Epoxy, Fabric
      • Epoxy, Roving
    • Epoxy, 250 F cure
      • Epoxy, 250 F cure, 12-inch tape
      • Epoxy, 250 F cure, 60-inch tape
      • Epoxy, 250 F cure, Fabric
      • Epoxy, 250 F cure, Roving
    • Epoxy, toughened
      • Epoxy, toughened, 12-inch tape
      • Epoxy, toughened, 60-inch tape
      • Epoxy, toughened, Fabric
      • Epoxy, toughened, Mat
      • Epoxy, toughened, Roving
  • Resin additives & modifiers
    • Conductive fillers
Primary manufacturing equipment
  • Automated fiber placement machines
  • Filament winding machines and software controls
  • Impregnation lines
  • Pultrusion equipment, thermoplastics
  • Pultrusion equipment, thermosets

Deep Links

Panex 35 products - Our commercial grade 50K PANEX® 35 carbon fibers are the lowest-cost carbon fiber on the market. We manufacture from an abundant textile-based precursor material that matches and outperforms "aerospace-grade" carbon fibers in tensile strength and modulus. In addition, our proprietary carbon fiber lines enable us to expand capacity at a fraction of the cost and time that is required by our competitors. This is vital to support large-volume applications that require significant amounts of carbon fiber in a short period of time.

Panex 30 products - PANEX® 30 products are PAN based materials that are >99% carbonized. These high-purity products are derived from Zoltek's high temperature batch carbonization process. They are most often used in extreme applications that demand resistance to harsh temperature and chemical environments. All PANEX® 30 materials are thermally stable and chemically pure.

Pyron products - PYRON® is our oxidized PAN fiber that is inherently flame resistant, which makes it an effective heat-blocking and fire barrier material. PYRON® fibers do not burn, melt, or drip. Instead, they char and self-extinguish. The largest application for PYRON® is the aircraft brake market, where it holds the dominant position in the marketplace. We have produced our oxidized PYRON® technical fibers for over 20 years, allowing us fine-tune our process and become the largest oxidized PAN fiber producer in the world.

As seen in Print
Zoltek to expand Hungarian carbon fiber facility
Carbon fiber manufacturer Zoltek has signed an agreement to expand its facility in Nyergesújfalu, Hungary, already the largest carbon fiber production plant in the world.

Mark Kawamura steps up to president/CEO of Zoltek Companies Inc.
Previously president/COO, Kawamura will now oversee all operations. He succeeds company founder Zsolt Rumy, who will retain his position on the Zoltek board.

Carbon Fiber 2014 Conference Report
Automation, alternative PAN precursor and carbon composites on commercial aircraft top the bill at December’s event on the US West Coast.

Supply and demand: Advanced fibers (2015)
Demand for advanced fiber, virgin and reclaimed, is on an upswing after a dip during the recent recession. Fiber suppliers are gearing up to meet an expected increase in demand as manufacturers in a number of composites end-markets scale up or start up part development and production programs.

Fiber reinforcement forms (2015)
Fibers used to reinforce composites are supplied directly by fiber manufacturers and indirectly by converters in a number of different forms, which vary depending on the application. Here's a guide to what's available.

Pressure vessels for alternative fuels, 2014-2023
Lower fuel costs and escalating emissions standards are driving a 10 percent annual growth in alternative fuel pressure vessel sales.

2014 JEC Europe Review
The composites world met again in Paris, vibrant, stronger, and more forward-looking than ever before.

Sales representative
Entec Composite Machines is seeking a sales representative to be based in Salt Lake City, Utah, or in St. Louis, Mo.

Composites the clear choice in telecom tower rehabs
Tower permit difficulties spur repairs/upgrades of aging steel structures.

Why are suppliers morphing into fabricators?
CT managing editor Mike Musselman asks the question and examines the forces at work to make it a compelling trend. Part I of II.

Toray completes purchase of Zoltek
Zoltek shares have been delisted from NASDAQ but the name will remain, says Toray.

Designing pressure vessels for seawater desalination plants
Safe high-pressure service challenges manufacturers of composite pressure vessels.

Toray acquisition of Zoltek delayed three months
The St. Louis Business Journal says Toray's purchase of Zoltek has been pushed from Jan. 31 to April 30 to allow time for investigation by the Committee on Foreign Investment in the United States.

Supply and demand: Advanced fibers
Manufacturers of carbon and other advanced fibers respond to sustained composites industry growth with new fiber production capacity.

The markets: Automotive (2014)
A revitalized auto industry emerged from the Great Recession in 2012 leaner and, in terms of health-related concerns, cleaner, too, but faced a one-two punch in terms of fuel economy and carbon-dioxide (CO2) emission standards that put intense focus on vehicle lightweighting.

IBEX 2013 Show Review
Evidence of a marine industry rebound and a trend toward supplier M&A as the world’s largest boatbuilding trade show looks ahead to smoother sailing … and Tampa.

Zoltek demonstrates Surface RTM for automotive body panels
Zoltek, working with partners KraussMaffei, Henkel, Chomarat and Ruhl has developed a high-speed process for the resin transfer molding (RTM) of carbon fiber/polyurethane auto body panels with Class A surfaces.

Toray + Zoltek = potential game changer?
Consultant Dale Brosius, also president of Dayton, Ohio-based Quickstep Composites LLC, the U.S. subsidiary of Australia-based Quickstep Technologies (Bankstown Airport, New South Wales), sees the Toray buyout of Zoltek as a potential auto-industry game changer.

Toray makes waves with Zoltek purchase
Toray was already the largest carbon fiber maker in the world, and with Zoltek it not only gets bigger, but expands into new markets.

Toray to buy ZoltekToray Industries to buy Zoltek Inc.
Toray Industries will purchase Zoltek Corp. for $584 million, to increase its global carbon fiber market share.