| HS Code | 221337 |
| Material | LG Chemical LUXY K-3G55 |
| Family | Amorphous Polyamide (PA) |
| Filler | 55% Glass Fiber |
| Process | Injection Molding |
| Density | 1.45 g/cm³ |
| Tensile Strength | 210 MPa |
| Flexural Modulus | 14000 MPa |
| Izod Impact Strength Notched | 80 J/m |
| Heat Deflection Temperature Hdt 1 82 Mpa | 230 °C |
| Glass Transition Temperature | 125 °C |
| Water Absorption 24 Hr | 0.4 % |
| Linear Mold Shrinkage | 0.2 % |
| Flammability Rating | HB |
| Dielectric Strength | 30 kV/mm |
As an accredited LG Chemical LUXY K-3G55 Amorphous PA + GF55%, Injection Molding factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 25 kg moisture-proof, sealed bags on pallets, stretch-wrapped for protection. Quantity: 25 kg per bag. |
| Container Loading (20′ FCL) | 20′ FCL loaded with palletized LUXY K-3G55 amorphous PA+GF55%, injection molding grade, secured for safe transit. |
| Shipping | Ship LUXY K-3G55 as sealed, moisture-proof bags or drums on pallets. Store in a cool, dry area away from direct sunlight and humidity. Handle gently to prevent bag damage. No hazardous goods classification; standard dry cargo transport with proper labeling and secure loading to avoid shifting. |
| Storage | Store in original, tightly sealed containers in a cool, dry, well-ventilated area. Protect from moisture, direct sunlight, and heat sources. Keep away from incompatible substances and ignition sources. Maintain temperatures below 30°C (86°F) and low humidity to prevent moisture absorption, which can affect processing properties. Use within shelf life, keeping containers resealed after each use. |
| Shelf Life | Store in original sealed packaging in a cool, dry place; shelf life is typically 2 years from production date. |
In underhood automotive electrical connector systems, dimensional drift caused by moisture absorption and thermal expansion is a primary failure source in engine-bay packaging. LG Chemical LUXY K-3G55, an amorphous polyamide injection-molding compound with a nominal short-glass-fiber content of 55 wt%, is introduced into connector and sensor housing DFM where the supplier’s ISO 294-4 shrinkage data and ISO 62 water-uptake data are used to set cavity steel dimensions before pilot tooling. Compliance benchmarks for this downstream segment include SAE/USCAR-2 for automotive electrical connector system performance, LV 214 terminal-force and fretting requirements, and ISO 16750-5 chemical resistance to engine oils, brake fluids, and urea solutions. On the material side, acceptance testing follows ISO 527-2 tensile modulus and strength, ISO 178 flexural modulus, ISO 179-1/1eA notched Charpy impact, and ISO 75-2 heat deflection temperature. The formulation is processed at the supplied 55 wt% glass loading without unreinforced PA dilution, because reducing the fiber volume fraction below the mold-compensation value shifts both flow-direction and cross-flow shrinkage outside the design window; if color coding is required, a pre-compounded color masterbatch at a letdown ratio not exceeding 2–3 wt% is preferred over screw-side addition to avoid localized fiber segregation. In production-scale molding, the pellets are dried at 80°C for 4–6 h to a residual moisture level below 0.06% using a desiccant dryer with a dew point of -30°C or lower. Barrel temperatures are profiled from 290°C to 320°C with a nozzle reading near 310°C, while the mold is held at 100–130°C to suppress free-volume relaxation and post-mold warpage. High injection velocities of 150–300 mm/s are used in thin-walled connector bodies with wall thicknesses of 0.4–1.2 mm, and cavity pressure sensors switch from injection to hold at 40–70 MPa cavity pressure. Because the 55% glass loading is abrasive, the molding cell uses a bimetallic barrel and a hardened screw with L/D 20:1–25:1. Terminal products include engine control unit connectors, transmission speed sensor housings, camshaft position sensor bodies, charge air temperature sensor enclosures, and urea injection harness connectors. The primary process failure mode is weld-line embrittlement in multi-cavity tools with unbalanced runner systems; this is controlled through valve-gated hot-runner sequencing and fiber-orientation simulation rather than by increasing melt temperature alone.
The limiting factor is not tensile modulus but the interaction between thin-wall flowing length, fiber-induced weld-line strength, and post-mold dielectric clearance stability after thermal cycling. In miniature circuit breaker frames, the compound’s 55 wt% short-glass content provides high flexural modulus under ISO 178 and creep resistance under ISO 899-2, but it also raises melt viscosity and reduces weld-line elongation; published data for LUXY K-3G55 in this specific multi-cavity breaker frame geometry are limited, so prototyping with pressure-instrumented tools is required. Compliance references are IEC 60898-1 and IEC 60947-2 for circuit-breaker functional requirements, IEC 60112 comparative tracking index determination, IEC 60243-1 dielectric strength, and IEC 60695-2-11 glow-wire test behavior. Flammability classification must be verified on the finished component; the standard LUXY K-3G55 grade is not a substitute for a dedicated flame-retardant compound where a UL 94 V-0 listing is mandatory. In formulation practice, the material is used at the nominal 55 wt% glass loading without post-barrel fiber addition; regrind is limited to 15 wt% of total shot weight for non-safety electrical frames, because higher regrind fractions reduce fiber length distribution and increase notch sensitivity. Production process constraints include the need for sequential valve gating to move weld lines away from high-stress snap features, mold temperature uniformity better than ±5°C across the cavity, and clamp-force capacity sufficient for projected areas above 400 cm². Pre-drying follows 80°C for 4–6 h, and residence time in the barrel is limited to 8 min at melt temperatures above 300°C to avoid thermal degradation of the amorphous polyamide backbone. Terminal products include MCCB internal partitions, busbar support frames, auxiliary contact housings, and coil former structural supports. The main production bottleneck is warpage caused by differential fiber orientation between thick bosses and thin ribs; this is controlled by mold-flow analysis with fiber orientation tensor prediction and by moving gate locations rather than by raising mold temperature alone.
In centrifugal pump impellers molded from 55 wt% glass-reinforced amorphous polyamide, dimensional stability in aqueous and glycol-containing media is the primary evaluation criterion, because the amorphous polyamide backbone typically exhibits lower equilibrium moisture uptake than semi-crystalline PA66 under ISO 62 immersion testing, though the exact LUXY K-3G55 datasheet value must be obtained from the supplier for clearance calculations. Industry compliance anchors for this application class include ISO 527-2 tensile properties, ISO 178 flexural properties, ISO 604 compressive strength, ISO 175 chemical resistance to process fluids, and ISO 294-4 mold shrinkage for tooling compensation. Finished impeller assemblies may be further validated against pump performance criteria derived from ISO 5199 for centrifugal pump classes, but the resin itself is not certified under that pump standard. The formulation addition ratio remains at the supplied 55 wt% glass fiber; no elastomer or mineral dilution is used because reducing fiber content changes radial shrinkage anisotropy and blade-tip clearance. Regrind is limited to 10–15 wt% for impellers, since twin-screw compounding history and injection-molding shear history progressively reduce glass fiber length distribution, and lower fiber length degrades notched Charpy impact under ISO 179-1/1eA and flexural fatigue at the blade root. In downstream processing, the impeller tool requires a center sprue with full-round or trapezoidal runners to maintain balanced filling, and gates are positioned at the hub rather than the vane tips to prevent free-jet fiber orientation defects and surface delamination. Melt temperature is controlled from 295°C to 315°C, mold temperature at 120–140°C, and hold pressure is selected to produce a gate-seal time of 8–12 s for thick hub sections. A production-scale issue observed on hydraulic injection machines with L/D 22 screws is screw recovery torque spike if the material is not adequately melted; this is mitigated by flat-temperature profiles and screw recovery speeds below 0.3 m/s. Terminal products include centrifugal pump impellers, wear rings, volute casing inserts, and mechanical seal housings. The critical risk is weld-line weakness at blade trailing edges; mold-flow simulation and short-shot validation are used to place weld lines in low-stress hub regions.
For power tool transmission housings, gear-reaction loads, motor-waste heat, and drop-impact requirements make creep modulus and impact retention the controlling material properties. For this downstream segment, compliance testing is anchored to IEC 62841-1 for motor-operated hand-held tools, ISO 527-2 for tensile modulus, ISO 178 for flexural modulus, ISO 179-1/1eA for notched Charpy impact at low temperatures, and ISO 75-2 for heat deflection under load. Electrical insulation requirements are validated through IEC 60243-1 and, where surface leakage is relevant, IEC 60112 comparative tracking index. The compound is processed at its nominal 55 wt% glass loading, and the formulation is not diluted with unreinforced PA to improve flow, because the resulting stiffness loss under ISO 178 would push the housing beyond permissible deflection at the gear-seat interface. Color masterbatch is limited to 2 wt% when used, and regrind is restricted to 10 wt% for impact-bearing housings; higher regrind fractions increase the probability of glass-fiber bundles and local notch sensitivity. The production process uses wall thicknesses of 3–6 mm, requiring extended cooling time due to low thermal conductivity; mold temperature is maintained at 100–120°C to allow relaxation of flow-induced orientation. Because of the 55% glass loading, gate inserts require hardened steel or carbide, and the screw and barrel are specified with bimetallic liners to limit wear. Sequential valve gating is used for multi-cavity production, and cavity pressure sensors control hold-pressure switchover at 60–80 MPa cavity pressure to prevent sinks over gear-seat bosses. Terminal products include angle grinder gear housings, drill transmission housings, circular saw lower guards, and hammer drill motor mounts. The dominant failure mode in production is post-mold warpage at the bearing seat, and mold-flow analysis with fiber orientation prediction is mandatory for producing dimensional capability below ±0.1 mm on critical bearing diameters.
When tooth profile stability under hygroscopic loading becomes the primary acceptance criterion for precision gears, the low moisture uptake and low anisotropic shrinkage of amorphous PA GF55 provide a measurable advantage over semi-crystalline PA66 grades. Compliance for this segment is bound to AGMA 920-A01 for plastic gear material selection, ISO 1328-1 gear accuracy, ISO 527-2 tensile properties, ISO 178 flexural modulus, ISO 75-2 heat deflection, and ISO 62 water absorption. For gear acceptance, tooth thickness and runout data are correlated to DIN 3962 or equivalent customer-specific master gear limits. The material is used as supplied at 55 wt% glass content; for gears, regrind is eliminated entirely because fiber attrition at the tooth root changes local stiffness and reduces tooth-root impact capacity under ISO 179-1/1eA. An external lubricant masterbatch is not added without a separate validation program, because modifying the fiber-matrix interphase changes tooth dedendum creep under load. In downstream processing, the gear tool is designed with the gate at the hub center to create radial fiber orientation and minimize eccentricity; mold temperature is held at 120–130°C with uniformity better than ±2°C across the cavity. Pre-drying at 80°C for 4–6 h is mandatory, and the melt temperature is kept at 300–315°C to maintain a homogeneous melt without exceeding the degradation threshold. Cavity pressure sensors are used to switch from injection to hold at 45–65 MPa, and the hold-pressure profile is segmented to maintain gate-seal integrity at the hub. Terminal products include HVAC actuator gears, office automation gear carriers, medical pump transmission gears, and robotics joint encoder wheels. A limitation to state plainly is that high-glass amorphous PA gears are not suitable for high-impact or high-load power-transmission stages; published data for LUXY K-3G55 under AGMA 920-A01 tooth bending fatigue are limited, and prototype gear tests are required before substitution into metal or PA46 gears.
Valve actuator housings and industrial sensor bodies molded from 55 wt% glass-reinforced amorphous PA are assessed against dimensional stability after thermal cycling and chemical exposure to hydraulic and ester-based oils. The relevant compliance framework includes ISO 527-2 tensile properties, ISO 178 flexural properties, ISO 604 compressive strength, ISO 175 chemical immersion, ISO 179-1/1eA notched impact, and ISO 294-4 mold shrinkage for tooling compensation. Electrical housings additionally require IEC 60243-1 dielectric strength and, for exposed surfaces, IEC 60112 tracking index. The formulation is processed at the nominal 55 wt% glass loading without dilution; regrind is limited to 10 wt% for sealing-surface components because regrind-induced microporosity and fiber ends can form leakage paths under pressure. In downstream manufacturing, the process often involves insert molding of brass or stainless-steel threaded inserts; the inserts are preheated to 120°C before loading to reduce differential thermal contraction and prevent hoop-stress cracking in the amorphous PA matrix. Melt temperature is maintained at 295–315°C, mold temperature at 110–130°C, and injection speed is profiled to avoid jetting around inserts. Screw and barrel metallurgy must account for the abrasive 55% glass content; bimetallic barrels and hardened screw flights are specified, and screw recovery speed is limited to avoid excessive fiber breakage. Terminal products include quarter-turn valve actuator housings, linear position transmitter bodies, industrial flowmeter housings, and pressure sensor enclosures. The production bottleneck observed on multi-cavity insert-molding cells is cavity-to-cavity shrinkage variation caused by insert temperature drift; this is controlled through in-cell preheating stations with closed-loop temperature control and sequential valve gating rather than through cycle-time reduction.
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LG Chemical LUXY K-3G55 is an amorphous polyamide injection molding compound reinforced with 55% by weight glass fiber. The grade is supplied in pellet form for precision structural parts that require lower mold-shrinkage anisotropy than is commonly available from semi-crystalline polyamides such as PA66 or PA6. Because the matrix is amorphous, the material does not develop spherulitic crystallinity during cooling. Dimensional stability is governed by glass-fiber orientation, mold-temperature uniformity, and hold-pressure decay rather than by crystallization kinetics. These characteristics place LUXY K-3G55 between unreinforced amorphous polyamide and semi-crystalline high-glass compounds in terms of flow, warpage, and part-to-part reproducibility.
The distinction is analytical before it is mechanical. A dried sample of LUXY K-3G55 examined by differential scanning calorimetry under ISO 11357-2 does not display a crystalline melting endotherm. The amorphous polyamide matrix exhibits a glass-transition region rather than a solid–liquid melting transition. This shifts thermal failure behavior from crystallinity loss to gradual modulus decay above the glass-transition temperature. In a 55% glass-filled semi-crystalline polyamide, the polymer fraction melts at a defined temperature, and uncontrolled cooling can produce differential crystallization between thick and thin sections. The amorphous matrix avoids that source of post-mold dimensional error.
Mold-shrinkage data generated under ISO 294-4 on plate tools show that a 55% glass-filled amorphous polyamide tends to produce flow-direction and transverse-direction shrinkage values closer in magnitude than typical PA66-GF50. The practical result is less out-of-plane bending in box-like parts with ribs, bosses, and asymmetrical wall thickness. Grade-specific shrinkage for LUXY K-3G55 should be taken from LG Chemical lot certificates because pigment package, regrind fraction, and tool-steel temperature alter the nominal value. Moisture absorption under ISO 62 is lower in the glass-filled grade than in an unfilled amorphous polyamide because 55% of the mass is glass, but the glass-matrix interface can be degraded by hydrolysis if the material is processed wet.
Compared with PA66-GF50, the amorphous matrix generally provides lower and more isotropic mold shrinkage but can exhibit lower resistance to polar organic solvents and hot chlorinated water. Compared with glass-filled PPA or PPS, the grade may have a lower continuous-use ceiling but can flow more predictably at conventional mold temperatures. Published data for this specific LUXY configuration in aggressive chemical exposure is limited; applications involving continuous fluid contact require customer-specific testing.
| Property or condition | Method / standard | Typical envelope for amorphous PA + 55 wt% glass fiber | Comparison reference |
|---|---|---|---|
| Glass-fiber content | ISO 3451-1 | 55% nominal by weight | PA66-GF50 is 50% nominal |
| Matrix crystallinity | ISO 11357-2 | No melting endotherm; glass transition observed in dry polymer | PA66 exhibits a melting endotherm near 260°C |
| Tensile stress at break, dry as molded | ISO 527-1/-2 | 190–230 MPa class range | PA66-GF50 often 200–250 MPa |
| Flexural modulus, 23°C | ISO 178 | 18,000–22,000 MPa class range | PA66-GF50 often 15,000–17,000 MPa |
| Mold shrinkage, 24 h after molding | ISO 294-4 | 0.10–0.35%; flow and transverse values close in magnitude | PA66-GF50 has stronger flow/transverse difference |
Table values are class envelopes compiled from public amorphous polyamide compounds containing 50–60% glass fiber. They are not a substitute for certified lot data for LUXY K-3G55. Design stress, creep, fatigue, and chemical-resistance values must be obtained from LG Chemical documentation for the specific grade and color.
Before injection molding, LUXY K-3G55 must be dried to a residual moisture content below 0.08%. Desiccant-bed dryers with a dew point of −40°C or lower are applied. Amorphous polyamides are hygroscopic; pellets exposed to ambient air recover surface moisture quickly. Covered hoppers and dry-air conveying are therefore required above 60% relative humidity. The barrel temperature profile should follow the supplier’s melt-temperature recommendation, typically in the 280–310°C range for glass-filled amorphous polyamide. Actual melt temperature is confirmed with a needle pyrometer rather than inferred from barrel setpoints. Holding pressure is set at 50–70% of injection pressure, and gate-seal time is established by weight-sort studies because the amorphous matrix has no crystallization plateau to indicate solidification.
Injection speed should be profiled so that flow-front velocity is constant. Because the 55% glass-fiber fraction increases melt thermal conductivity and shear heating, slow filling can produce premature freeze-off in thin sections. Fast filling without adequate venting can produce gas burns. A representative vent depth for glass-filled amorphous polyamide is 0.02–0.04 mm on the parting line, with land width from 2–5 mm. Residence time in the barrel is limited to 8 min at maximum melt temperature. If the shot sequence is interrupted longer than this, purge cycles with a lower-glass or unfilled polyamide should be used. Thermal degradation of amorphous polyamide is evidenced by yellowing, viscosity reduction, and generation of volatiles.
The material must be kept free of POM and PVC contamination. Acidic decomposition products from these resins hydrolyze polyamide at processing temperature. Blending with semi-crystalline polyamide regrind is not recommended above 5% because the crystallinity difference introduces shrinkage gradients and can distort flat parts. Regrind use, where permitted, must be controlled by weight fraction and limited to clean, non-degraded sprues and runners.
| Control point | Target / boundary | Instrument or method |
|---|---|---|
| Residual moisture | <0.08% | Karl Fischer titration or equivalent |
| Dryer dew point | −40°C or lower | Dew-point meter |
| Melt temperature | 280–310°C | Needle pyrometer |
| Mold temperature | 100–140°C | Surface thermocouple |
| Screw L/D | 20:1 or longer | Screw drawing |
| Compression ratio | 2.0:1–2.5:1 | Screw drawing |
| Maximum melt residence time | 8 min | Shot counter / timer |
| Vent depth | 0.02–0.04 mm | Feeler gauge |
The processing table is a representative boundary set for glass-filled amorphous polyamide. Actual machine settings for LUXY K-3G55 should be established from the certified lot datasheet and retained as a process sheet for each tool. Melt-temperature uniformity across the manifold is monitored with a thermal camera or contact probe because local overheating accelerates fiber-matrix debonding.
At 55% glass fiber by weight, the abrasive character of the filler dominates equipment wear. General-purpose screws are not advisable. A hardened, wear-protected screw with a compression ratio of 2.0:1 to 2.5:1 and L/D of 20:1 or longer is used. The check ring should be hardened chrome or CrN-coated, and the screw tip should be inspected by shot counter rather than calendar time. Barrel wear is more pronounced in the compression and metering zones; bimetallic barrels are preferred for extended production campaigns.
Gate geometry is set by glass-fiber length. Submarine or tunnel gates smaller than 1.0 mm diameter tend to produce high shear heating and fiber breakage. Edge gates and tab gates should have land length no greater than 1.0 mm. For multi-cavity tools, the runner system should be naturally balanced, and cold-runner diameters should be 4–6 mm. Hot-runner valve-gate systems can be used, but the gate insert must be hardened, and the nozzle tip must not create a dead spot. Glass-fiber accumulation at the nozzle tip can cause black specks and gate blockage.
Production-scale molding of comparable 50–60% glass-filled amorphous polyamides on all-electric injection molding machines with screw diameters of 25–30 mm indicates that screw recovery time often controls cycle time rather than mold cooling time. Backpressure is maintained between 4 MPa and 8 MPa. Below this range, unwetted glass bundles may remain; above it, fiber length can degrade and check-ring wear increases. Cavity pressures in thin-wall sections can exceed 80 MPa, so clamp force is calculated from projected area with a safety factor of 1.3–1.5.
For automotive camera housings, electronic enclosure frames, and industrial valve bodies, the usefulness of LUXY K-3G55 is tied to flatness and bore stability after exposure to heat and moisture. The 55% glass-fiber reinforcement raises flexural modulus into the 18,000–22,000 MPa class under ISO 178 and reduces creep under clamping loads, while the amorphous matrix lowers the isotropic shrinkage difference across bosses and ribs. In flatness-critical parts, tool temperature uniformity of ±5°C is maintained across the fixed and moving halves because the amorphous matrix has no crystallization plateau to reset orientation stresses.
The grade is selected where PA66-GF50 has failed flatness tolerances or where post-molding moisture absorption causes progressive warpage. Operational boundaries exist: continuous exposure to hot mineral acids, strong alkaline solutions, or chlorinated oxidizing media can attack the polyamide backbone. If the component carries drinking water or food-contact responsibility, compliance must be verified under the relevant national or regional regulation because glass-filled amorphous polyamide formulations are not universally food-contact grade. Published data for this specific LUXY configuration in long-term chemical immersion is limited; ISO 22088-2 stress-crack testing or customer-specific immersion protocols are required before production release.
For recycling, parts are marked according to ISO 11469 as >PA-GF55< where the base resin is identified by the supplier. Lot traceability of glass-fiber type, surface treatment, and antioxidant package should be maintained because variation in these parameters changes weld-line strength and retention of properties after long-term heat aging.
