No. of Recommendations: 2
SGL Carbon is in Wiesbaden, Germany, and is listed on European stock markets. It has no adr's in the US.

Toho Tenax is one of the automotive players working with GM, but it's a Japanaese company:

Toray Carbon Fibers claims to be the largest producer of carbon fibers--

Mitsubishi Rayon owns Grafil, which manufactures carbon fibers in Sacramento, CA.

Nippon Carbon Fiber is an affiliate of Nippon Steel and Nippon Oil of Japan. It specializes in carbon fiber derived from pitch.

In addition to carbon fiber the other part of a carbon composite is a resin, which come from a variety of suppliers. Unsaturated polyester resin is inexpensive, but epoxy is probably preferred for durability. Prepregs are often used. A non-tacky but reactive resin is applied to the fiber or woven fabric then cured (thermoset) by baking after shaping by various techniques.

The carbon fiber is often made by baking/sintering polyacrylonitrile (PAN), but other carbon sources can be used. PAN is best known to the consumer as the synthetic wool fibers sold as Acrylan or Orlon.
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