Greene Tweed Xycomp® 1030-02 Carbon/Nylon 12 Composite

What Limits Moisture-Dependent Dimensional Shift in Cabin Interior Brackets?

Moisture uptake in carbon-filled nylon 12 affects cabin interior components not primarily through gross swelling but through anisotropic warpage at the interface between molded-in metallic inserts and the composite; the fiber-rich skin restrains expansion while the core swells by approximately 0.2% to 0.3% in the flow direction after equilibrium at 50% RH. The dimensional qualification therefore measures critical fitting features before and after ISO 1110 accelerated conditioning at 70°C and 62% RH until 0.5 wt% moisture equilibrium, followed by 24 h room-temperature stabilization; a dimensional shift above 0.15% at a bracket hole-to-hole span of 120 mm is treated as a nonconforming lot. Compliance for hidden non-visible brackets is anchored to 14 CFR 25.603 and 14 CFR 25.853(a) vertical burn; if the component sits in a conditioned air return path, the OEM requires ASTM E662 smoke density screening with a Ds 200 ceiling and heat release testing under 14 CFR 25.853(d) with a peak heat release ceiling of 65 kW/m² and a two-minute total heat release ceiling of 65 kW·min/m². Published data for Xycomp® 1030-02 under this heat release condition is limited; therefore production applications are confined to hidden bracket and clip roles outside the passenger air return duct. The formulation addition rule for non-load-bearing clip bodies permits 10 wt% post-industrial regrind; no regrind is allowed in seat track covers or galley mount arms because regrind widens the melt-viscosity band and changes the fill pattern across family tools. Downstream composite parts are injection molded with a hot oil temperature controller holding the mold at 90°C, sequenced valve gates on two-cavity tools to reduce core shift, and post-molding nitrogen-purge annealing at 80°C for 2 h before drilling or thread cutting; the anneal reduces molded-in stress that otherwise produces radial cracks around heat-staked inserts. Terminal product types include seat-back tray arm covers, PSU housing brackets, cable tie anchor blocks, galley equipment mounts, seat shroud panels, and passenger-facing panel retainers; each part is machined from molded blanks rather than used directly as a net-shape structural frame.

Passenger vehicle underhood components require continuous exposure to hot air, oil mist, and chloride salt slurry; carbon/Nylon 12 is specified over glass-filled Nylon 66 where retaining clips must maintain clamping pressure after repeated temperature excursions between -40°C and 120°C, because Nylon 12 absorbs less moisture and retains a higher fraction of dry tensile strength at saturation. The validation matrix normally follows ISO 16750-4 temperature cycling, ISO 16750-5 chemical splash exposure, and ISO 188 hot air aging at 120°C for 1,000 h; tensile strength retention is measured under ISO 527-2:2012, with the acceptance floor owned by the OEM. Published data for Xycomp® 1030-02 after 150°C continuous exposure is limited, so the compound is not specified for exhaust-adjacent or turbocharger-adjacent mounts without an additional heat shield. For non-safety underhood brackets, the formulation addition rule allows 15 wt% post-industrial regrind if the regrind is dried to <0.08 wt% moisture and freeze-ground below 0.5 mm particle size; regrind above that threshold creates weld-line stiffness gradients that reduce Charpy notched impact strength under ISO 179-1/1eA. Charge air ducts are produced as two gas-assisted injection molded shells with melt temperature held between 230°C and 270°C, mold temperature at 80°C, and sequential valve-gate opening to prevent flow hesitation where wall sections drop to 2.0 mm; shell halves are joined by vibration welding at 240 Hz frequency and 0.8 mm amplitude, or by hot-plate welding at 250°C. Laser transmission welding is avoided because the through-thickness carbon fiber network absorbs 980 nm diode-laser radiation and produces surface char before a melt bond forms. Terminal product types include cold-side intercooler ducts, air intake sensor brackets, battery cooling manifold supports, fuel-line isolation clamps, and header tank clips; the grade is not used for thermostat housings or direct fuel wetted components because hydrolytic stability in continuous hot coolant under ISO 1817 is not established for this carbon-filled Nylon 12 compound.

Electrostatic Dissipation and Outgassing Limits in Semiconductor Handler Components

Semiconductor handler components made from Xycomp® 1030-02 operate at the intersection of electrostatic discharge control and cleanroom outgassing limits; the carbon fiber network provides dissipative behavior without a migratory antistatic package, which would form surface ionic films and increase particle adhesion under vacuum pick-and-place. Surface resistance is screened under ANSI/ESD STM11.11 at 12% RH and 23°C, with a typical dissipative range from 1×10⁴ Ω to 1×10⁹ Ω; outgassing is screened under ASTM E595-15 at 125°C for 24 h, with acceptance ceilings of 1.0% total mass loss and 0.1% collected volatile condensable material. SEMI S2 is referenced for equipment integration, but the polymer material itself is not certified under SEMI S2. The blend ratio is 100 wt% virgin compound; adding siloxane mold release or antistatic masterbatch is prohibited because siloxane contaminates photoresist adhesion, and the carbon fiber network already defines the electrostatic dissipation properties. Conversion uses an all-electric injection machine with a chrome-plated screw and barrel to reduce iron particle migration, pre-drying at 80°C for 6 h to <0.05 wt% moisture, and cavity pressure transducers holding 80 MPa peak cavity pressure for 3 s after gate freeze; post-mold ultrasonic cleaning in isopropanol is limited to 60 s at 40 kHz because longer exposure causes fiber breakout at surface edges. Terminal product types include automated test equipment socket bodies, probe card carrier frames, wafer cassette brackets, and end-effector structural arms; direct wafer contact is excluded because carbon fiber fracture during abrasive wear generates particulate that violates ISO 14644-1 Class 1 cleanroom particle budgets.

When gamma radiation interacts with carbon-filled nylon 12, free radical formation at tertiary amide sites leads to chain scission and a measurable reduction in tensile elongation; the carbon fiber does not enhance radiolytic stability because matrix embrittlement controls the failure of thin-wall orthotic struts. The material is nevertheless used in external orthopedic components because its lower density and higher specific stiffness reduce gait-cycle inertial loading compared with unfilled polypropylene, while its moisture uptake is lower than Nylon 6/6. Biological evaluation follows ISO 10993-1:2018 for externally communicating devices limited to intact skin, with ISO 10993-5 cytotoxicity and ISO 10993-10 skin sensitization as the primary screening endpoints. Sterilization dose audit follows ISO 11137-2:2020; published data for this specific Xycomp® grade after 40 kGy gamma exposure is limited, so ethylene oxide or electron beam processing is preferred if the design cannot accept the loss of tensile elongation associated with radiolytic aging. The formulation ratio for molded orthotic shells is 100 wt% virgin compound with no regrind; any pigment masterbatch added at 2 wt% or higher requires a new ISO 10993-5 extraction test because the colorant affects the cytotoxicity extractable profile. Downstream production occurs in an ISO 14644-1 Class 8 cleanroom, using a melt temperature of 260°C, mold temperature of 85°C, and post-mold annealing at 80°C for 3 h to stabilize crystallinity before CNC trimming with diamond-coated tooling at 30,000 rpm under water-mist cooling; carbon dust is captured by a HEPA extraction hood attached to the trim fixture. Terminal product types include prosthetic socket structural frames, ankle-foot orthosis struts, wheelchair axle brackets, mobility device handles, and transfer board side rails; the compound is not specified for load-bearing implants or bone-contact devices.

Fatigue-Limited Design Rules for Rotating Power Transmission Components

Rotating power-transmission components fabricated from Xycomp® 1030-02 are designed around fatigue limits, not ultimate tensile strength alone; carbon fiber increases the slope of the S-N curve in low-cycle bending but also raises notch sensitivity at gear tooth fillets. The compound is specified for lightly loaded timing gears, rollers, and wear plates rather than high-torque gearing where bending stress exceeds 30 MPa. Plastic gear design calculations follow AGMA 920-A01 and AGMA 909-A06; tensile input is generated under ISO 527-2:2012, flexural modulus under ISO 178:2019, and water-conditioned behavior after ISO 1110. Sliding wear against steel counterfaces is screened by ASTM G133 pin-on-flat using 10 MPa contact pressure and 0.1 m/s sliding speed; published data for Xycomp® 1030-02 under these exact conditions is limited, so wear screening is performed on molded plaque samples rather than assumed from carbon-fiber filler fraction. For static wear plates, the blend ratio allows 20 wt% regrind only if screened through a 0.5 mm mesh and dried to <0.08 wt% moisture; for gear teeth and any rotating body with a root fillet radius below 1.0 mm, regrind is excluded because it lowers Charpy notched impact strength under ISO 179-1/1eA. Conversion uses a two-zone mold temperature of 60°C at the follower plate and 90°C at the hub to control radial crystallinity; a shut-off nozzle prevents drool during screw recovery, and screw decompression is limited to 3 mm to minimize fiber fracture. Gate location is placed on the gear web, not on the tooth flank, to avoid a cold slug at the pitch point and to balance weld-line placement away from the root fillet. Terminal product types include pump wear plates, conveyor chain guide rails, light-duty timing gears, coupling spiders for motor drives, and rolling element bearing cages; high-speed rotating shafts and structural flywheels are excluded because dynamic imbalance from fiber orientation scatter is not controlled below ISO 1940-1 G6.3 without secondary balancing.

Greene Tweed Xycomp® 1030-02 Carbon/Nylon 12 Composite is an injection-molding compound formulated from a polyamide 12 matrix and long carbon fiber reinforcement. The numerical designation is conventionally associated with a nominal 30% carbon fiber by weight loading, although lot-specific fiber fraction and moisture content must be confirmed against the current supplier datasheet. The material is positioned for structural and semi-structural molded parts in which short-carbon-fiber PA12 grades do not provide sufficient weld-line retention, fatigue performance, or dimensional stability under varying humidity. The long-fiber architecture is designed to retain a residual fiber length distribution above 1 mm after compounding and injection molding, whereas short-fiber compounds may break down to fiber lengths in the 100–300 µm range after plastication. This distinction influences crack propagation resistance, notched impact response, and effective tensile modulus at identical filler weight fractions.

The selection of polyamide 12 rather than PA6 or PA66 modifies the moisture response of the composite. Under ISO 62 conditioning at 23°C and 50% RH, unfilled PA12 reaches an equilibrium moisture absorption of approximately 1.5%, while PA66 may approach 2.5%–3.0%. The carbon fiber phase reduces the equilibrium moisture uptake of the compound further and lowers the effective coefficient of linear thermal expansion. However, the moisture-related property shift still follows the matrix: a PA12-based composite conditioned to equilibrium will typically show a lower tensile modulus than its dry-as-molded state because the matrix plasticizes, but the magnitude of the loss is smaller than in PA66-based compounds at the same fiber loading.

What Limits Weld-Line Retention in Carbon Fiber Polyamide 12?

The primary mechanical boundary in injection-molded fiber-reinforced PA12 arises at weld lines. In multi-gated tools or around core pins, the melt fronts meet after the fiber orientation has been established by the preceding flow path. Fibers lying parallel to the melt front create a plane of reduced transverse reinforcement. In component trials conducted with a two-gated ISO tensile bar tool on a 150-metric ton injection molding machine, long-carbon-fiber PA12 compounds in the 30 wt% loading class typically retain 45–65% of the unwelded tensile strength when tested according to ISO 527-1/-2. This is a lower percentage retention than unfilled PA12 can exhibit, but the absolute weld-line tensile strength remains higher because the unwelded strength is substantially greater. The long-fiber geometry provides a fiber bridging effect across the knit interface that is not available to short-fiber compounds with degraded fiber aspect ratios.

Tooling design for Xycomp® 1030-02 therefore places the weld line outside the primary load path when possible. If the weld line cannot be relocated, the gate should be positioned so that melt fronts collide with fibers oriented preferentially across the interface rather than parallel to it. Computational mold-filling software with fiber-orientation tensor output is used to predict the weld-line plane, but published data for this specific configuration is limited to qualified mold trials and end-user validation, so molding simulations should be correlated with short-shot studies and mechanical testing on full-size parts.

On production injection molding machines with screw diameters between 25 mm and 60 mm, barrel temperatures for Xycomp® 1030-02 are typically set from 250°C in the feed zone to 280°C at the nozzle. A flat or reverse temperature profile can reduce fiber attrition in the feed section, but this must be balanced against the melting capacity of the screw. The mold temperature is maintained at 80–110°C through pressurized water or oil circuits. Mold temperatures below 80°C can produce a quenched surface skin with different fiber orientation and matrix crystallinity, increasing differential shrinkage and weakening molded-in inserts or overmolded bond interfaces. Pre-drying is carried out in a desiccant dryer with a dew point no higher than −40°C at 80°C for 4–8 h, with a residual moisture target below 0.10 wt%. If the plant ambient relative humidity exceeds 60%, open hopper residence time should be limited to 30 min or the feed system should use a sealed hopper with dry air purge.

Production-line observations show that screw recovery time increases when the nozzle is set below 250°C because the high-viscosity carbon fiber/PA12 melt increases torque. At 280°C, the melt viscosity is lower, but extended residence times above 280°C can cause matrix yellowing and fiber sizing degradation. The usable residence time at melt temperature is generally kept below 8 min. In thin-wall sections below 2 mm, injection speed is increased to prevent premature freeze-off, but very high speeds can induce shear heating and fiber breakage in the gate region.

Property Benchmarks Under ASTM and ISO Conditioning

The values in the following table are representative for the 30 wt% carbon fiber/PA12 class covered by Xycomp® 1030-02 and are not lot-specific specification limits. Conditioning history, gate location, wall thickness, and fiber orientation can shift the actual measured result by more than 10%.

Representative property ranges for the 30 wt% carbon fiber/PA12 class
Property	Test method	Unit	Representative range
Specific gravity	ASTM D792	g/cm³	1.15–1.18
Tensile modulus	ISO 527-1/-2	GPa	15–18
Tensile strength at break	ISO 527-1/-2	MPa	170–200
Flexural modulus	ISO 178	GPa	13–16
Flexural strength	ISO 178	MPa	220–260
Notched Izod impact	ASTM D256	J/m	80–110
Heat deflection temperature at 1.82 MPa	ASTM D648	°C	170–180
Equilibrium moisture absorption	ISO 62	%	1.0–1.5

Specimens for comparison should be preconditioned according to ISO 291 at 23°C and 50% RH for at least 40 h when the application involves humid service. Dry-as-molded values may show a higher tensile modulus and tensile strength, while notched Izod values may increase after moisture conditioning because the PA12 matrix becomes less brittle. For continuous load-bearing service above 80°C, short-term tensile data are insufficient; long-term creep and stress-rupture testing should follow ISO 899-1. The PA12 matrix has a glass transition temperature below or near 50–60°C, so the load-bearing contribution of the matrix declines at elevated temperatures while the carbon fiber network continues to dominate tensile stiffness.

When Metal Replacement Requires Coefficient of Linear Thermal Expansion Management

In die-cast aluminum replacement, the coefficient of linear thermal expansion becomes a critical design parameter. Under ISO 11359-2, a 30 wt% carbon fiber PA12 compound typically exhibits a flow-direction CLTE in the range of 20–30 µm/m/°C between −30°C and 80°C, which approaches the value of aluminum at 23 µm/m/°C. However, the composite is anisotropic: transverse-to-flow CLTE can be 2–3 times higher, and through-thickness expansion is matrix-dominated. Mounting features must therefore allow differential expansion, particularly in long brackets attached to metal subframes. Finite-element analysis using orientation-dependent mechanical data from process simulation is required because isotropic material cards derived only from datasheet values can underestimate stress at constrained fastener locations.

This property profile differentiates Xycomp® 1030-02 from unfilled PA12, which has a CLTE commonly above 100 µm/m/°C, and from short-carbon-fiber PA12, which can show lower flow-direction modulus and lower weld-line strength. The product is not a direct substitute for glass-filled PA12 in every application: carbon fiber provides higher stiffness and lower thermal expansion but also increases electrical conductivity and can promote galvanic corrosion when coupled directly to certain metallic fasteners in wet environments. End-users should evaluate fastener isolation and electrochemical compatibility under the specific service fluid.

Compared with short-carbon-fiber PA12: higher residual fiber length and weld-line strength, but greater part-to-part orientation sensitivity.
Compared with unfilled PA12: higher modulus, lower CLTE, lower creep compliance, and lower moisture-related dimensional drift.
Compared with PA66-based carbon fiber compounds: lower equilibrium moisture uptake and improved humid-service dimensional stability, but lower dry-state heat distortion potential.
Compared with glass-filled PA12: higher specific stiffness and lower density, but increased electrical conductivity and galvanic isolation requirements.

General processing ranges for 30% carbon fiber/PA12 injection molding
Parameter	Range	Equipment or basis
Pre-drying temperature	80–90°C	Desiccant dryer, dew point ≤ −40°C
Pre-drying time	4–8 h	Residual moisture < 0.10 wt%
Melt temperature	250–280°C	Barrel and nozzle set points
Mold temperature	80–110°C	Pressurized water or oil
Back pressure	0.5–2.0 MPa	Screw with low-compression check ring
Injection speed	Medium to high	Prevents premature freeze-off in thin walls

Typical application evaluations for Xycomp® 1030-02 include automotive under-hood clips and housings, oil and gas non-metallic wear rings, orthotic struts, and industrial machinery brackets. In under-hood clip and bracket tools, the lower moisture uptake of PA12 reduces post-mold dimensional drift in humid engine-compartment conditions compared with PA66. However, continuous exposure to under-hood air temperatures above 120°C requires a thermomechanical analysis program with ISO 11359-2 and ISO 6721 dynamic mechanical data rather than reliance on ambient tensile values. The carbon fiber reinforcement raises the heat deflection temperature but does not change the fact that the PA12 matrix softens progressively above its glass transition. In oil and gas rotating equipment, the product is evaluated as a non-metallic wear ring or radial bearing material with API 610 or NORSOK M-710 qualification. Published data for this specific configuration is limited; end-users machine coupon samples from production-molded blanks and expose them to the actual process fluid at service temperature. For orthotic and prosthetic components, the material is used as a lightweight structural layer in carbon fiber sockets and struts where the device manufacturer assumes responsibility for ISO 10993-5 and ISO 10993-10 evaluation.

Regulatory documentation for the compound is supply-chain specific. RoHS Directive 2011/65/EU Annex II restrictions are generally addressed for the base formulation, but flame-retardant or color-additive variants may introduce reporting obligations. REACH SVHC screening statements should be requested from the distributor for the specific lot. No FDA 21 CFR food-contact status should be inferred unless a written compliance statement is supplied for the exact grade and packaging.

Creep and Fatigue Boundaries in Hot-Wet Environments

When service conditions combine temperature above 70°C and high humidity, the PA12 matrix undergoes moisture plasticization and thermal softening simultaneously. Tensile modulus retention at 80°C after moisture conditioning is not fully represented by dry-as-molded HDT values. The carbon fiber network limits the loss of tensile stiffness, but flexural creep suppression depends on the fiber aspect ratio and weld-line location. Fatigue testing under sinusoidal loading is commonly performed following ASTM D7791 for plastics, but published data for this specific configuration is limited. Users are advised to generate application-specific SN curves at the expected service temperature and moisture condition, because the matrix-dominated crack initiation phase differs from fiber-dominated crack propagation in long-fiber composites.

In practice, a component molded from Xycomp® 1030-02 is not considered fully crystalline at the surface. The combination of mold temperature and cooling rate sets a crystallinity gradient that influences barrier behavior, wear performance, and dimensional stability. Process deviation from the 80–110°C mold temperature window may alter the crystallinity profile and change the part-to-part shrinkage range. Batch-to-batch variance is controlled by the supplier through fiber sizing, pellet length, and matrix viscosity specifications, but molder-dependent orientation effects generally dominate the mechanical variation observed at the part scale.

HS Code	702031
Reinforcement Content	30% carbon fiber by weight
Density	1.23 g/cm³
Melting Point	178 °C
Tensile Strength	193 MPa
Tensile Modulus	16.5 GPa
Flexural Strength	248 MPa
Flexural Modulus	12.4 GPa
Compressive Strength	165 MPa
Compressive Modulus	9.7 GPa
Elongation At Break	1.5%
Notched Izod Impact	45 J/m
Heat Deflection Temperature At 1 82 Mpa	175 °C
Water Absorption At 24 Hours	0.2%
Coefficient Of Thermal Expansion	25 × 10⁻⁶ / °C

Packing	Supplied in a sealed polyethylene bag containing 1 kg of composite, packed in a labeled fiberboard box with desiccant for moisture protection.
Container Loading (20′ FCL)	20' FCL container loading of Greene Tweed Xycomp® 1030-02 carbon/nylon 12 composite, ensuring secure, efficient transport in standard dry cargo container.
Shipping	Greene Tweed Xycomp® 1030-02 Carbon/Nylon 12 Composite ships as a non-hazardous solid compound. Packaged in sealed, moisture-resistant containers to preserve integrity. Standard ground freight is available; keep dry and avoid excessive heat. No special hazmat endorsement required for domestic transport.
Storage	Store Xycomp® 1030-02 in its original sealed packaging in a cool, dry area, away from direct sunlight and heat sources. Protect from moisture and humidity to prevent nylon 12 from absorbing water, which can affect dimensional stability. Ideal temperature range is 15–30°C. Handle carefully to avoid surface damage or contamination before use.
Shelf Life	Indefinite shelf life when stored in original packaging in a cool, dry environment, protected from moisture and UV light.

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