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We focus on what keeps our customers one step ahead. Continuous carbon fiber tows are heavy tows with 50 000 filaments (50k). Each of our 50k heavy tows have outstanding mechanical properties that can be transferred to the finished products and components. The fibers can be chosen to match specific requirements, for example by prioritizing stiffness or strength. In addition, these wide 50k fiber tows offer time and cost advantages, especially in high-volume processes. Smart solutions from SGL Carbon – the real enablers.
Continuous carbon fiber tows from SGL form the basis of many composite applications and are used in numerous industries.
To guarantee the very highest quality, we manufacture our SIGRAFIL continuous carbon fiber tows exclusively in our plants in Europe and North America. In addition, our customers benefit from our unique expertise in 50k fibers across all processing stages.
Market segments of our Business Unit Carbon Fibers
Automotive
• Structural components
• Design components
• Chassis components
• Drive train
Industrial Applications
• Medical technology
• Robotics and automation technology
• Measuring technology and optics
• Machinery manufacture
• Sports & leisure
• Antiballistic technology
• Marine industry
Aerospace
• Primary and secondary structural components
• Interior components
Energy
• Renewable energies
SIGRAFIL continuous carbon fiber tows based on PAN
We manufacture SIGRAFIL on the basis of a polyacrylonitrile fiber (PAN fiber). With its high strength, high elastic modulus, and low density, SIGRAFIL is a high-performance material that makes it possible to produce very stiff yet lightweight composites.
We use heavy tows with 50 000 filaments that offer time and cost advantages in many different processes. By making application-tailored adjustments, we can provide individual solutions for different requirements and processes.
Typical applications
• Unidirectional and multiaxial fabric/prepreg production
• Pultrusion
• Braiding and filament winding processes
• TowPreg production
• Use for C-SMC
• Production of thermoplastic composite materials
SIGRAFIL material advantages
• Best mechanical properties
• Low density (light weight)
• Low thermal expansion
• Good electrical conductivity
• High corrosion resistance
• Excellent impregnation behavior
• Good spreadability
Material data of our SIGRAFIL continuous carbon fiber tows
| Typical properties | Units | CT50-4.0/240 | CT50-4.6/260 | CT50-4.8/280 |
| Number of filaments | 50k | 50k | 50k | |
| Fineness of yarn dry | tex (g/1000 m) | 3420 | 3420 | 3070 |
| Density | g/cm3 | 1.80 | 1.80 | 1.78 |
| Single filament diameter | um | 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 |
Compatible matrix systems for our SIGRAFIL continuous carbon fiber tows
Matrix compatibility
• Epoxy, polyurethane, phenol
• Vinyl ester (and all radical-based curing systems), unsaturatedpolyester
• Polyurethane, polycarbonate, polyester, polysulfone, cyanate ester,polyamide, BMI, PESU, PEEK, PEKK, PVC, polyimide
• Polypropylene
• Polyamide
• PA-RIM process (in-situ polymerization of caprolactam, e.g. reactivePA processing

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