Xiamen Meijiamei ABS 5010CF is a carbon-fibre-reinforced acrylonitrile-butadiene-styrene compound supplied as pellet feedstock for injection moulding and, with screw configurations appropriate for shear-sensitive fibre compounds, limited extrusion of dimensionally stable profiles. The designation 5010CF is conventionally interpreted as a nominal 10 wt% chopped carbon fibre loading; the actual fibre mass fraction and sizing chemistry should be confirmed from the lot certificate of analysis rather than the trade designation. Published data for this specific configuration is limited. Therefore, the numerical bands presented in this document are class-typical values for carbon-fibre-filled ABS of comparable nominal loading and are not a substitute for the producer’s datasheet or first-article testing.

Material Constitution and Filler Dispersion Requirements

The compound combines a multi-phase ABS matrix with discontinuous carbon fibre reinforcement. A filler content of 10 wt% typically raises tensile modulus by a factor of 2 to 3 relative to unfilled ABS and reduces elongation at break to below 4% when tested under ISO 527-2. Reinforcement is anisotropic: flow-direction tensile modulus may exceed cross-flow values by 20% to 40% because fibres align along the melt front. Dispersion quality is governed by residual fibre length after plastication, gate shear, and pack pressure. A general-purpose screw with an L/D ratio of 20:1 to 25:1 and a compression ratio of 1.8:1 to 2.2:1 is normally specified to limit fibre attrition. A check-ring design with generous flow clearances reduces fibre breakage at the non-return valve.

Because the matrix is ABS, the butadiene phase contributes low-temperature ductility but also narrows the thermal degradation window. Polymer should not be held at melt temperature longer than necessary; total residence time above 250 °C should be kept below 8 min to avoid brown streaking and a drop in notched impact strength. When short shots or gate blush appear, the first correction is to verify actual melt temperature and gate shear rate rather than raising barrel temperature without measurement.

Moisture management is critical because carbon-fibre sizing can adsorb more water than the unmodified ABS matrix. When pellets have been exposed to ambient relative humidity above 60%, pre-drying in a desiccant dryer at 80 °C for 3 h to 4 h to a residual moisture content below 0.05 wt% is required before processing. A drying air dew point below -30 °C should be maintained. Inadequate drying produces silver streaking, nozzle drool, and loss of interply adhesion at weld lines.

Melt temperature set points between 230 °C and 250 °C are typical for carbon-fibre ABS. Actual melt temperature should be verified because shear heating during plasticating can add 10 °C to 20 °C to the barrel set point. Excursions above 280 °C risk butadiene-phase degradation, carbon dioxide evolution from degraded sizing, and black specks; excursions below 220 °C produce non-uniform melt homogeneity and poor fibre wet-out. Mould temperatures from 40 °C to 80 °C are commonly used. The upper end of the range improves knit-line strength and moulded surface finish but increases cycle time.

Injection moulding machines should be sized so that shot capacity uses 20% to 60% of barrel volume. Screw speed is typically limited to 60 min⁻¹ to 100 min⁻¹, and back pressure is held between 0.3 MPa and 0.7 MPa to avoid excessive fibre fracture. Actual cavity pressure during packing is commonly maintained between 35 MPa and 70 MPa to compensate for the low die swell of the filled melt and to reduce sink marks. A hold-pressure profile that decays from 60% to 80% of peak injection pressure over 5 s to 10 s can reduce gate-area stress whitening.

What Performance Shifts Occur When Carbon-Fibre ABS Replaces Unfilled or Glass-Fibre ABS?

Unfilled ABS is an electrical insulator with surface resistivity typically above 1×10¹² Ω/sq under IEC 61340-2-3. The incorporation of conductive carbon fibre can lower surface resistivity into the dissipative range of 1×10³ Ω/sq to 1×10⁶ Ω/sq, depending on fibre wet-out, moulding orientation, and ambient humidity. This shift permits the material to be evaluated for use in electrostatically protected areas governed by IEC 61340-5-1 or ANSI/ESD S20.20. Because the dissipation mechanism is based on conductive fibre networks rather than migrating antistatic additives, function is less dependent on relative humidity and does not rely on additive bloom; however, weld lines and highly oriented surfaces can create local resistivity gradients above 10⁹ Ω/sq when fibre network continuity is interrupted.

Mechanical behaviour also shifts. Notched Izod or Charpy impact values typically fall by 30% to 60% relative to a medium-impact unfilled ABS because carbon fibres act as stress concentrators in the notch-sensitive ABS matrix. The coefficient of linear thermal expansion decreases, commonly into the range of 3.0×10⁻⁵ K⁻¹ to 5.5×10⁻⁵ K⁻¹ in the flow direction under ISO 11359-2, compared with 7×10⁻⁵ K⁻¹ to 10×10⁻⁵ K⁻¹ for unfilled ABS. This reduction supports dimensional stability in precision brackets and sensor housings but must be balanced against anisotropic shrinkage; mould shrinkage in the flow direction may be 0.2% to 0.4%, while cross-flow shrinkage may be 0.5% to 0.8%.

One processing distinction from glass-fibre ABS is the combined effect of carbon fibre on electrical dissipation and mould wear. Glass-fibre ABS of similar weight fraction can provide a comparable stiffness increase at lower material cost, but the compound remains electrically insulating unless carbon black or antistatic additives are introduced. Carbon-fibre ABS therefore becomes a candidate when a single material must provide both mechanical reinforcement and dissipative function. The trade-off is that carbon fibre is more expensive and more abrasive than glass fibre; bimetallic barrels, hard-chromium or ceramic-coated screws, and hardened non-return valves are specified for continuous production.

Incoming inspection can include ash content per ISO 3451-1 at 850 °C to confirm carbon fibre content within ±1 wt% of the nominal specification; melt volume-flow rate per ISO 1133-1:2022 at 220 °C and 10 kg to detect lot-to-lot viscosity drift; and density per ISO 1183-1:2019 to detect porosity or filler segregation. Regrind from runners and rejected parts may be incorporated at 10 wt% to 20 wt% if it is dried and free of fines. Each regrind pass shortens fibre length and can reduce tensile modulus by 5% to 15% per pass when tested under ISO 527-2. Granulator rotor/stator clearances below 0.2 mm reduce fines generation, and fines below 0.125 mm should be removed to avoid non-uniform feeding and surface blemishes.

When Electrostatic Dissipation and Dimensional Stability Are Required in Housings and Carriers

Typical application evaluations for this product class include electronics assembly trays, ESD storage boxes, sensor housings, robotic gripper arms, inspection fixtures, and light-duty structural brackets where a surface resistance below 1×10⁹ Ω is required for charge decay. Compliance with an electrostatic protected area under IEC 61340-5-1 usually demands measurement of resistance to groundable point and walking voltage/footwear systems as part of the full product qualification, not just material surface resistivity. Moulded parts should be conditioned in the end-use environment because resistivity can rise by more than one order of magnitude at 12% RH relative to 50% RH if fibre network contacts are disrupted by moisture-related matrix swelling.

Dimensional stability is influenced by anisotropic carbon fibre orientation. Gate placement, fill time, and packing pressure should be evaluated using injection moulding simulation software and short-shot moulding trials to position weld lines away from load-bearing regions. Weld-line strength in carbon-fibre ABS can be reduced by 50% to 70% relative to a continuous-fibre-oriented area because fibres do not bridge the knit line effectively. Where the design cannot avoid a weld line, increasing the mould temperature to 80 °C and using a generous flow leader can improve fibre re-entanglement at the interface.

The grade should not be considered a direct replacement for carbon-fibre-filled high-temperature polymers such as PEEK or PPS. The continuous service temperature under load is limited by the ABS matrix, typically below 80 °C to 90 °C for load-bearing parts; above this range, dimensional stability under creep load degrades. The compound is also notch-sensitive; snap-fit features should be designed with radii larger than those used for unfilled ABS and with deflection stress analyzed under ISO 527-2 tensile data rather than impact-modified ABS data.

Compared with machined aluminium, the carbon-fibre ABS compound offers a density reduction of approximately 60% because aluminium is 2.7 g/cm³ and the compound is around 1.1 g/cm³; however, tensile strength is lower by approximately 80% or more relative to 6061-T6 aluminium, so load-bearing metal replacement requires section redesign and joint analysis.

When the grade is trialled as a replacement for machined aluminium in electronic assembly fixtures, published data for this specific configuration is limited. A controlled trial should include mapping of surface resistivity from gate to end-of-fill at 12% RH, 50% RH, and 70% RH; notched impact testing at the minimum service temperature; and measurement of flatness after 24 h post-mould conditioning to detect anisotropic warpage. In addition, any cleaning or adhesive bonding process should be validated because carbon-fibre-filled ABS may not respond uniformly to solvent welding or cyanoacrylate bonding; surface abrasion and plasma treatment can change local conductivity and reduce bond strength at the fibre-matrix interface. No food-contact or medical-use claim is made under FDA 21 CFR 177.1020 or EU 10/2011 unless the supplier supplies a migration-test report for the exact grade and lot.