Asphalt-based carbon fiber testing service

Asphalt-Based Carbon Fiber Testing Service for Global Advanced Material Compliance

As an ISO/IEC 17025 accredited laboratory, we deliver a specialized asphalt-based carbon fiber testing service that verifies the mechanical properties, chemical composition, thermal stability, electrical conductivity, and long-term durability of pitch-derived carbon fibers. Our asphalt-based carbon fiber testing service supports manufacturers and exporters of mesophase pitch carbon fiber, general-purpose carbon fiber, and related composite intermediates who must demonstrate conformity to ASTM, ISO, JIS, and regional advanced material standards across the European Union, North America, East Asia, and the Middle East. Every test is performed under our CNAS-accredited quality system, producing reports accepted by notified bodies, composite OEMs, and procurement teams worldwide.

Product Samples We Regularly Test in Our Asphalt-Based Carbon Fiber Testing Service

• Continuous mesophase pitch-based carbon fiber tows — for high-modulus aerospace structures, satellite components, and precision instrument panels
• General-purpose isotropic pitch carbon fiber — for thermal insulation, friction materials, and conductive fillers
• Chopped and milled asphalt-based carbon fiber — for reinforcement in concrete, thermoplastics, and specialty coatings
• Carbon fiber felt, mat, and paper from pitch precursors — for high-temperature furnace insulation and battery electrode substrates
• Prepreg and preform materials using asphalt-based carbon fiber — for compression molding and resin transfer molding of advanced composites
• Surface-treated and sized asphalt-based carbon fiber — with epoxy, vinyl ester, or thermoplastic-compatible finishes
• Recycled and reclaimed asphalt-based carbon fiber products — for sustainability verification and secondary use qualification

Mechanical and Physical Property Testing for Asphalt-Based Carbon Fiber

• Tensile strength and modulus of single filaments per ASTM D4018 and ISO 10618 — individual asphalt-based carbon filaments are pulled to failure using a calibrated single-fiber tensile tester, measuring ultimate tensile strength, modulus of elasticity, and elongation at break to verify the fiber grade and performance class.
• Tensile properties of impregnated tow specimens per ASTM D4018 and ISO 10618 — resin-impregnated tow specimens are tested to determine the composite-relevant tensile strength and modulus, eliminating the influence of fiber gripping and providing design values for structural applications.
• Density and specific gravity per ASTM D3800 and ISO 10119 — the mass per unit volume of the asphalt-based carbon fiber is measured using a density gradient column or gas pycnometry, verifying the material's lightweight characteristic and consistency across production lots.
• Filament diameter and cross-sectional shape per ISO 11566 and ASTM D578 — optical microscopy and image analysis measure the average filament diameter and detect any non-circular cross-sections that could affect packing density and mechanical performance.
• Linear density and tow tex per ISO 1889 and ASTM D1907 — the mass per unit length of the carbon fiber tow is determined to verify the specified filament count and to support conversion calculations for weaving and prepregging.
• Stiffness and handle of woven or unidirectional fabrics per ASTM D1388 — for fabrics made from asphalt-based carbon fiber, the flexural rigidity and drape are measured to predict layup and forming behavior.

Chemical Composition and Structural Analysis for Asphalt-Based Carbon Fiber

• Carbon content and elemental analysis per ASTM D5373 and ISO 10694 — the total carbon, hydrogen, nitrogen, and sulfur content of the asphalt-based carbon fiber is quantified to verify the carbonization degree and to detect residual heteroatoms that could affect thermal and electrical performance.
• Ash content and inorganic residue per ASTM D5630 and ISO 3451-1 — the fiber is incinerated and the residual ash is weighed to quantify metal impurities and catalyst residues that could degrade the fiber's high-temperature stability or electrical conductivity.
• X-ray diffraction for crystallite structure and graphitization degree per ASTM D3720 — the interlayer spacing, crystallite size, and degree of graphitization are determined to verify the pitch precursor's conversion to high-modulus carbon fiber and to correlate with thermal and mechanical properties.
• Raman spectroscopy for carbon structure and defect density per internal validated protocol — the intensity ratio of the D-band to G-band is measured to assess the degree of structural order and the presence of defects in the asphalt-based carbon fiber.
• Surface chemistry and sizing analysis by FTIR and XPS per ASTM E1252 and ASTM E1078 — the functional groups on the fiber surface and the composition of any applied sizing are identified to verify compatibility with the intended resin matrix and to detect surface contamination.
• Residual solvent and volatile content per ASTM D4526 — headspace gas chromatography quantifies any residual solvents from the spinning, stabilization, or sizing processes, ensuring the carbon fiber meets the cleanliness requirements for aerospace and electronics applications.

Thermal and High-Temperature Performance Testing for Asphalt-Based Carbon Fiber

• Thermal conductivity by laser flash method per ASTM E1461 and ISO 22007-4 — the thermal diffusivity and specific heat of the asphalt-based carbon fiber are measured, and the thermal conductivity is calculated to verify the fiber's heat dissipation or insulation capability for thermal management applications.
• Coefficient of thermal expansion per ASTM E228 and ISO 7991 — the linear thermal expansion of the carbon fiber is measured from cryogenic to elevated temperatures, confirming the low or negative CTE characteristic of pitch-based carbon fiber that provides dimensional stability in precision structures.
• Thermogravimetric analysis and oxidative stability per ASTM E1131 and ASTM D3850 — the mass loss profile and the oxidation onset temperature are recorded to define the maximum continuous service temperature and to predict the fiber's resistance to oxidative degradation in air.
• Thermal shock and rapid temperature cycling per IEC 60068-2-14 — the asphalt-based carbon fiber is rapidly cycled between hot and cold extremes to verify the material withstands thermal expansion and contraction without micro-cracking or loss of mechanical properties.
• Long-term thermal aging per ASTM D3045 — the fiber is aged at elevated temperatures and the retained tensile strength and modulus are measured to predict the thermal endurance and service life under continuous heat exposure.

Electrical Conductivity and Electromagnetic Performance Testing for Asphalt-Based Carbon Fiber

• Volume and surface resistivity per ASTM D257 and IEC 60093 — the electrical resistance through and along the asphalt-based carbon fiber is measured to verify the specified conductivity class for EMI shielding, antistatic, and conductive composite applications.
• Electrical conductivity of single filaments per internal validated protocol — a four-point probe on individual fibers quantifies the intrinsic electrical conductivity, providing the fundamental material property for resistivity calculations in composite structures.
• Shielding effectiveness of carbon fiber fabrics and laminates per ASTM D4935 and IEEE 299 — the asphalt-based carbon fiber in fabric or composite form is tested for its ability to attenuate electromagnetic fields across a defined frequency range, supporting its use in RF enclosures and stealth structures.
• Impedance and dielectric properties of carbon fiber composites per ASTM D150 — the dielectric constant and loss tangent are measured for asphalt-based carbon fiber reinforced polymers to characterize their behavior in high-frequency electronic applications.

Report Recognition and ISO/IEC 17025 Compliance

Every test method described in this asphalt-based carbon fiber testing service is covered by our ISO/IEC 17025 scope of accreditation. Our technical reports and certificates of analysis are accepted by European notified bodies for advanced materials, by North American aerospace and composite OEMs referencing ASTM and ISO standards, and by customs and procurement authorities across Japan, Korea, and the Gulf region. Whether you require a complete qualification dossier for a new pitch-based carbon fiber grade, a batch release inspection for an export shipment, or a root cause failure analysis of a fiber or composite performance issue, our laboratory provides the measurement accuracy and carbon material expertise that the global advanced composites industry demands.