SIGRAFIL® Carbon Fibers

What are carbon fibers?

Carbon fibers are manufactured on the basis of polyacrylonitrile (PAN). They are microscopically small and about eight times thinner than a human hair. Bundled as multifilament yarn, carbon fibers offer the best mechanical properties for fiber composite applications. Learn more

At SGL Carbon, we manufacture our SIGRAFIL carbon fibers exclusively in-house in our plants in Europe and North America to ensure the highest quality at all times. In addition, our customers benefit from our unique expertise for 50k carbon fibers along all processing stages. By making application-tailored adjustments, we offer individual solutions for differentrequirements and processes. Give us a call or write to us.

Best mechanical properties
Low density (light weight)
Good electrical conductivity
Excellent impregnation behavior
Good spreadability

For high-tech applications requiring high strength and stiffness combined with light weight, SIGRAFIL continuous carbon fiber tows are indispensable. They form the basis for high-performance composite materials such as textiles and prepregs, as well as components made of carbon fiber-reinforced plastic (CFRP). Carbon fibers are used in the automotive industry, in aerospace, in wind turbines, but also in sports equipment or mechanical engineering.

Typical properties	Units	C T50-4.0/240	C T50-4.6/260	C T50-4.8/280
Number of filaments		50k	50k	50k
Fineness of yarn dry	tex (g/1000m)	3420	3420	3070
Density	g/cm³	1.80	1.80	1.78
Single filament diameter	µm	7.0	7.0	6.6
Tensile strength	GPa	4.0	4.6	4.8
Tensile modulus	GPa	240	260	280
Elongation at break	%	1.70	1.70	1.65
Single filament resistivity	µΩm	15	17	16

By applying different types of sizing, the carbon fibers can be optimally matched to different matrix systems. In this way, it is possible to produce application-tailored versions as well as the standard materials. So, together with our customers, we find optimized solutions for their challenges.

Matrix compatibility
Epoxy, polyurethane, phenolic
Vinyl ester (sand all radical-based curing systems), unsaturated polyester
Polyurethane, polycarbonate, polyester, polysulfone, cyanate ester, polyamide, BMI, PESU, PEEK, PEKK, PVC, polyimide
Polypropylene
Polyamide
PA-RIM process (in-situ polymerization of caprolactram, e.g. reactive PA processing)