| HS Code | 997298 |
| Glass Fiber Content | 55% |
| Density | 1.54 g/cm³ |
| Water Absorption 24h 23 C | 0.30% |
| Tensile Strength At Break | 220 MPa |
| Elongation At Break | 1.5% |
| Flexural Strength | 325 MPa |
| Flexural Modulus | 15300 MPa |
| Izod Impact Strength Notched 23 C | 11 kJ/m² |
| Heat Deflection Temperature 1 82 Mpa | 160 °C |
| Glass Transition Temperature | 170 °C |
| Melting Point | None (amorphous) |
| Volume Resistivity | 1e16 Ω·cm |
| Dielectric Constant 1 Mhz | 4.1 |
| Ul94 Flammability Rating | HB |
As an accredited LG Chemical LUXY K-10G55ST Amorphous PA factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg sealed polyethylene-lined kraft bags, ensuring moisture protection and safe handling of amorphous PA resin. |
| Container Loading (20′ FCL) | 20′ FCL: pre-palletized bags of LG Chemical LUXY K-10G55ST Amorphous PA, securely loaded, wrapped, and ventilated for safe transport. |
| Shipping | LG Chemical LUXY K-10G55ST Amorphous PA ships as a non-hazardous polymer resin. It is packed in sealed, moisture-proof bags or drums to prevent water absorption. Load in clean, dry containers, avoiding excessive heat. Standard ground or sea freight is suitable; no dangerous-goods declaration is required. |
| Storage | Store LUXY K-10G55ST Amorphous PA in its original sealed container in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and moisture. Keep the container tightly closed to prevent water absorption, which can degrade performance. If opened, reseal immediately; dry the resin at 80–90°C before processing if exposure occurs. |
| Shelf Life | Shelf life is typically 2 years from production date when stored in original, unopened packaging in a cool, dry place. |
Automotive exterior mirror base brackets are overmolded with LG Chemical LUXY K-10G55ST amorphous PA on vertical clamp injection machines selected from projected area and an assumed cavity pressure of 40–60 MPa. The 55 wt% glass fiber loading is verified by ISO 3451-1 ashing at 750°C; lot-to-lot variation in glass content is tracked because it shifts melt viscosity and cavity fill pressure. Material is dried in a closed-loop desiccant dryer with -40°C dew point supply air to a residual moisture level below 0.05% before processing, measured by ISO 15512 Karl Fischer titration. Barrel temperatures are profiled from 260°C at the feed throat to 290°C at the nozzle, and the mold is held at 110–130°C with pressurized water. This mold temperature range is used to reduce frozen-in orientation in the amorphous matrix and to stabilize shrinkage after demolding. Shrinkage is audited on bracket datum features according to ISO 294-4 after conditioning at 23°C and 50% RH under ISO 291.
The terminal assembly is required to survive thermal cycling from -40°C to 85°C under ISO 16750-4. Insert bosses show stress cracking when a knit line falls in a load-bearing web; therefore gate placement is adjusted to drive the knit line into a non-structural rib. In production, surface splay from moisture regain is the main rejection mode. At relative humidity above 60%, open granulate storage beyond 4 h requires re-drying at 80°C for 4–6 h before return to the hopper. Direct feed from the dryer to the machine is preferred. The combination of high glass content and amorphous PA causes measurable screw and barrel wear; bimetallic barrels and hardfaced screw flights are specified for continuous campaigns.
Tooling for the base frame uses a three-plate cold-runner system or hot drops; when hot drops are used, the manifold is set at 280°C and the nozzle tip is thermally separated from the cold mold steel to prevent stringing. The bracket wall stock is maintained between 2.0 mm and 2.5 mm; ribs are kept below 0.6× the nominal wall to avoid sink marks. Incremental short-shot studies are used to set velocity-to-pressure switchover at 95% of cavity volume fill. Holding pressure is set from the gate-seal time determined by weight stabilization. This sequence reduces internal voids and improves insert retention after thermal cycling.
For high-pin-count board-to-board connector insulators, LG Chemical LUXY K-10G55ST amorphous PA is processed through valve-gated hot-runner systems with gate diameters of 0.8–1.2 mm. The 55 wt% glass fiber content produces a highly shear-sensitive melt; below a wall thickness of 0.5 mm, flow-front hesitation exposes glass fibers at the surface and can reduce surface insulation resistance under IEC 62631-3-2. Fill time is held below 1.5 s, and peak injection pressure is maintained between 120 MPa and 180 MPa to avoid flash while preserving fiber aspect ratio. Packing is applied with a decaying profile from 80 MPa to 40 MPa over 4–6 s. Valve-pin closure before packing completion creates sink marks over metal inserts and pitch error across multi-position headers; post-mold pitch is verified against the drawing and correlated with shrinkage anisotropy measured under ISO 294-4.
The main process conflict is the relationship between mold temperature and cycle time. Mold temperatures below 100°C yield a lower cycle time but increase post-mold warpage and surface stress; mold temperatures above 130°C improve relaxation but increase ejection force and cycle time. A mold temperature of 115°C ± 5°C is used, with large-diameter sleeve ejectors to reduce white stress marks at the connector tower base. Weld-line strength is checked by ISO 527-2 on specimens cut across the gate junction; published data for this specific configuration is limited, so molded parts from the actual cavity are tested. Gate location is placed in a non-critical rib where the weld line does not intersect the contact retention feature.
Mold flow simulation is used to map the glass fiber orientation tensor in the connector housing; input fiber aspect ratio and density values are taken from the supplier and validated against short-shot studies. Weld-line location is predicted with the cross-flow solver, and the gate is moved when a predicted weld line intersects a retention lance. After molding, connector insulators are conditioned at 85°C and 85% RH for 1,000 h under IEC 60068-2-78 to evaluate insulation resistance and dimensional stability. Acceptance limits are based on the customer drawing and not on generic material datasheet values.
Optical sensor housings for LiDAR and machine vision assemblies are molded from LG Chemical LUXY K-10G55ST amorphous PA in oil-free electric injection machines. The amorphous polyamide matrix absorbs moisture under humid exposure, and the glass fiber network restrains hygroscopic expansion; dimensional change after damp heat exposure under IEC 60068-2-78 is therefore smaller than in unfilled amorphous PA but still requires calibration limits on the optical datum plane. Machined locator bosses are gated directly, and conformal cooling channels are placed within 8–10 mm of the cavity surface to maintain a mold temperature of 120°C. Surface quality at the lens seat is critical; exposed glass fibers are rejected by visual inspection using limit boards referenced to ISO 4287 surface texture parameters. Conditioning before dimensional audit follows ISO 291 at 23°C and 50% RH.
Batch-to-batch variation in fiber length distribution affects tensile modulus and direction-dependent shrinkage. Incoming resin is sampled and checked by ISO 3451-1 ashing, and capillary viscosity is measured at 290°C with a shear rate of 1,000 s⁻¹ under ISO 11443 to detect regrind or moisture-related degradation. Regrind of clean sprues and runners is limited because fiber length reduction changes Charpy impact values under ISO 179-1/1eA. The lens seat flatness is measured by a coordinate measuring machine after 24 h; if the datum plane shifts, the packing time and mold temperature profile are corrected before the tool is returned to production.
The magnification of the optical path places tight control on the lens-locating diameter; this diameter is measured after conditioning in a controlled atmosphere, and any out-of-round condition is correlated with non-uniform packing pressure around the core pin. Core pin cooling is balanced so that the pin temperature does not exceed 125°C during continuous cycling. If the pin overheats, the amorphous PA sticks and tears on ejection, producing a rough lens seat. Ejection is performed with a two-stage profile: slow initial movement for 2–4 mm, then fast retraction. This minimizes distortion of the thin optical datum wall before the part reaches room temperature.
For medical diagnostic enclosures with internal heat sources, LG Chemical LUXY K-10G55ST amorphous PA is processed on all-electric injection machines with 1,000–1,500 kN clamp force. Short-term heat deflection is evaluated by ISO 75-2 at 1.8 MPa; however, continuous service near the glass transition region of the amorphous matrix requires creep evaluation rather than reliance on HDT alone. Creep testing is performed under ISO 899-2 at 60°C and 20 MPa for 1,000 h on specimens cut from enclosure sidewalls; published data for this specific configuration is limited, so design verification uses vendor long-term data with a deflection safety factor of 1.5. Screw bosses are positioned away from the power supply and use brass inserts; the boss outer diameter is maintained at 2.5× the insert outer diameter to prevent hoop stress cracking after insertion.
Flammability documentation for the enclosure is based on molded plaques from production lots, not supplier datasheet values alone. Glow-wire testing is performed under IEC 60695-2-12 at 750°C and 850°C; the final UL 94 classification depends on color, regrind level, and wall thickness, so on-site testing is required. Biocompatibility is not assumed from the polymer composition; testing under ISO 10993-1 is required for the intended patient-contact and skin-contact duration classifications. Process qualification includes drier installation qualification to maintain -40°C dew point and mold temperature controller verification to hold 120°C ± 3°C over 24 h continuous runs.
When pneumatic valve bodies and end caps are molded from LG Chemical LUXY K-10G55ST amorphous PA in two-plate tools with hydraulic core pulls for port undercuts, splay is the dominant scrap issue. It appears as silvery streaks radiating from hot-runner valve pins and is linked to moisture regain in the granulate. Drying is set at 80°C for 4 h in a desiccant-bed dryer with -40°C dew point air; hopper residence time is limited to 1 h at 23°C and 60% RH to prevent moisture regain. Line-start moisture is checked by ISO 15512 Karl Fischer titration, and the lot is not approved until the measured value is below 0.05%. When dryer outlet dew point rises above -30°C, the corresponding residual moisture can exceed 0.08%, and the risk of splay increases sharply.
Melt preparation uses a screw compression ratio of 2.2:1 and a barrel profile from 260°C to 285°C. Melt residence time is kept below 5 min because amorphous PA with high glass content can undergo thermal degradation during extended screw rotation at the cushion. Short shots are traced to check-ring leakage; a non-return valve with 0.02–0.04 mm radial clearance and a hardened seat is specified. Valve bodies are pressure-tested with air at 0.6 MPa under water; leakage at the weld line is the primary rejection mode, so the gate is relocated to place the weld line in a thick boss rather than the thin sealing face. Chemical compatibility with compressor oil mist is screened by ISO 175 volume swell after 72 h at 60°C; published data for this specific configuration is limited, and production parts are tested against the customer's actual lubricant formulation.
Because the valve body is a pressure-containing component, weld-line location is also examined by microtome cross-sectioning and transmitted light microscopy. Fiber-poor weld lines appear as dark bands and are rejected if the band depth exceeds 10% of the wall thickness. Tooling changes include overflow wells at the end of the flow path to allow gas and cold material to purge from the melt front. These wells are removed from the final part by secondary machining if the valve body geometry does not permit a tab gate. Removal is included in the process route and is validated by the air pressure test at 0.6 MPa.
On hot-runner multi-cavity tools with 8 cavities and mechanical valve pins, LG Chemical LUXY K-10G55ST amorphous PA is molded into electronic chassis frames for portable industrial instruments. The 55 wt% glass loading reduces mold shrinkage but increases sensitivity to gate geometry. Gate diameters below 1.0 mm create excessive shear heating; gate diameters above 1.5 mm extend packing time and delay ejection. A valve-gate diameter of 1.2 mm is used with a hot-runner manifold temperature of 280°C. Shrinkage is measured on frame datum features after 48 h conditioning at 23°C and 50% RH under ISO 291; flow-direction and transverse-direction shrinkage are recorded using ISO 294-4. Cavity steel is cut with anisotropic shrinkage compensation based on mold simulation, and the tool is re-cut if datum hole position drifts beyond drawing tolerance.
The frame requires flatness of 0.3 mm across a 180 mm length. Post-mold warpage is controlled with a mold temperature of 120°C and a holding time of 8 s per 1 mm of wall thickness. Unbalanced cooling between moving and stationary halves produces bowing, so cooling loop flow rates are balanced to maintain a temperature difference below 2°C. Tensile properties are checked per ISO 527-2; because final part properties depend on fiber orientation and weld-line location, testing at the actual gated section is required. The grade is not specified for continuous exposure to hot water above 80°C or to strong acids, where the glass fiber and amorphous polyamide matrix can undergo surface attack and fiber leaching.
First article inspection includes a full dimensional scan after 48 h and a second scan after 500 h of damp heat exposure. The second scan identifies progressive relaxation and moisture-induced distortion that is not captured by the immediate post-mold measurement. If the second scan reveals movement outside the datum tolerance, the mold temperature profile or packing pressure decay is adjusted. This two-stage audit is used because the amorphous matrix and the glass fiber orientation state relax at different rates, producing a measurable bias from initial inspection data.
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LG Chemical LUXY K-10G55ST is an injection-moulding-grade amorphous polyamide with a nominal 55 wt% glass-fibre loading and a super-tough impact-modifier system. The grade designation is conventionally read as follows: K-10 identifies the amorphous polyamide backbone, G55 denotes the nominal glass-fibre content, and ST denotes the super-tough modification. The material is supplied in pellet form and is intended for injection moulding of dimensionally critical structural parts. Because the amorphous matrix absorbs atmospheric moisture, the pellets must be dried immediately before moulding to prevent hydrolytic molecular weight loss.
Compounding of this glass-fibre-reinforced amorphous PA is typically performed on a co-rotating twin-screw extruder with an L/D ratio of at least 44:1 and a side feeder for continuous glass roving. The most significant production-scale wear mechanism is abrasion in the side-feed zone, where glass strands enter the melt. Hardened screw elements and bimetallic barrels are specified for long runs. After compounding, the pellets are dried to below 0.10% moisture (ISO 15512) and packaged with a moisture barrier. Published data for the exact extruder configuration used by LG Chemical is limited; however, the above practice is standard for high-glass-fibre polyamide families.
Moisture exposure at room temperature can raise pellet moisture from 0.05% to above 0.15% in less than 1 h when exposed to humid air; therefore, hopper dryers or sealed feed systems are used. The high filler content raises melt viscosity, decreases mould flow length, and increases screw and barrel wear. For injection moulders, a machine with a general-purpose screw of 20:1 to 25:1 L/D may be adequate only for short runs; production tools with glass-filled material typically use hardened screws, hard-coated check rings, and reverse-flow tips.
Because the matrix is amorphous, no spherulitic crystallisation occurs inside the mould. Shrinkage is controlled by thermal contraction, glass-fibre orientation, and packing pressure rather than by post-mould crystallisation. Representative injection-moulded shrinkage values measured to ISO 294-4 are 0.1–0.3% parallel to flow and 0.3–0.5% transverse to flow. This differential remains sufficient to produce warpage in flat parts with ribbing or off-centre gating, but it is lower than the flow-transverse differential observed in semi-crystalline PA66 GF50. Differential scanning calorimetry to ISO 11357-2 shows no melt endotherm; the glass transition is typically between 130°C and 140°C. Despite the amorphous matrix, the high glass loading raises the deflection temperature under load to approximately 235°C (ISO 75-2, method A). However, modulus decreases above the glass transition, and continuous load-bearing above 130°C is not recommended.
In multi-cavity tools, the low and relatively isotropic shrinkage improves dimensional capability in tight-tolerance automotive brackets, electronic housings, and optical mounting structures. A mould temperature of 80–120°C is used to reduce frozen-in orientation and improve surface replication. Higher mould temperatures reduce the transverse-to-flow shrinkage variation but increase cycle time. Process validation should include short-shot studies and cavity-pressure sensors placed at the last-fill position. Cavity pressure curves should be used to set the switch-over point from velocity to pressure control; a typical cavity pressure at switch-over is 350–500 bar for thin-wall parts.
Injection moulding defects associated with insufficient drying include splay, silver streaks, and reduced notched impact. Hydrolysis of the amide linkages in the melt is accelerated above 0.15% moisture; the resulting molecular weight loss increases melt flow rate and lowers tensile strength. Desiccant dryer dew point is more important than air temperature: a dew point of ≤ -30°C is required to achieve the target moisture level. Dryer capacity must match shot weight and cycle time; if the hopper is oversized for the consumption rate, pellets can over-dry and discolour.
Drying is the first critical step. The material should be dried at 80°C for 4–6 h in a desiccant dryer with a dew point of ≤ -30°C; the target melt moisture content is ≤ 0.10% by ISO 15512. Melt temperature should be maintained between 280°C and 300°C. Barrel temperature zones are typically profiled from 250°C at the rear to 290°C at the front, with the nozzle at 290–300°C. Residence time at melt temperature should not exceed 10 min. Because the glass-fibre network increases viscosity, screw recovery should be slowed to limit shear heating. Screws with a compression ratio of 2.0–2.4 and an L/D ratio between 20:1 and 25:1 are specified. Mould temperature is set to 80–120°C, which is higher than the 70–90°C commonly used for PA66 GF50. Hold pressures of 400–700 bar are typical for thin-wall structural parts.
Hot-runner systems for this grade should be externally heated and free of stagnant zones. Thermally degraded material from dead spots produces black specks and reduces impact strength. On all-electric injection moulding machines, decompression after plastication is used to prevent nozzle drool because the amorphous melt has a broad softening range. Purging between colours or formulations should use a dedicated high-viscosity polyamide purge compound. Production experience shows that glass-fibre abrasion shortens screw and check-ring life compared with unfilled amorphous PA; hard-coated check rings and reverse-flow tips are recommended.
Table 1 places representative values for LUXY K-10G55ST next to a typical unreinforced amorphous PA and a PA66 GF50 reference. The comparison is not a specification and should be used only for preliminary material selection. The latest manufacturer’s datasheet remains the binding source for specification limits.
| Property | Standard | LUXY K-10G55ST | Unreinforced amorphous PA | PA66 GF50 |
|---|---|---|---|---|
| Density | ISO 1183 | 1.62 g/cm³ | 1.10 g/cm³ | 1.56 g/cm³ |
| Tensile strength at break | ISO 527-2 | 200 MPa | 80 MPa | 220 MPa |
| Flexural modulus | ISO 178 | 17,000 MPa | 3,000 MPa | 16,000 MPa |
| Notched Izod impact 23°C | ISO 180/A | 18 kJ/m² | 6 kJ/m² | 12 kJ/m² |
| HDT/A 1.82 MPa | ISO 75-2 | 235°C | 120°C | 250°C |
| Mould shrinkage flow/transverse | ISO 294-4 | 0.1–0.3/0.3–0.5% | 0.5/0.5% | 0.25/0.55% |
The main difference is not stiffness but shrinkage uniformity. PA66 GF50 develops spherulitic crystallinity, which increases the flow-transverse shrinkage differential and can cause post-mould warpage. The amorphous grade avoids crystallinity, so the remaining shrinkage anisotropy is largely fibre-orientation driven. In exchange, PA66 GF50 has better resistance to hot glycol and stronger retention of mechanical properties above 150°C. Against an unreinforced amorphous PA, LUXY K-10G55ST increases flexural modulus by roughly a factor of five and raises HDT/A by approximately 115°C; however, flow length decreases and gate pressures increase.
The super-tough modification changes the failure mode from brittle to ductile at ambient temperature. The notched Izod impact value of 18 kJ/m² (ISO 180/A) is approximately double that of a non-super-tough GF55 amorphous PA. This improvement is obtained at the cost of a modulus reduction of about 10% relative to a non-ST analogue. Published data for a direct non-ST comparison is limited, and the exact value should be confirmed with the current datasheet. For structural parts subjected to repeated loading, fatigue testing to ISO 13003 or equivalent is recommended; weld-line tensile strength in glass-reinforced amorphous polyamide can fall to 40–50% of the bulk value.
Parts moulded from LUXY K-10G55ST may require post-mould conditioning if impact resistance is critical in humid service. Absorbed water plasticizes the amorphous polyamide matrix, raising notched impact and reducing tensile modulus. Conditioning can be performed at 23°C and 50% relative humidity until the desired moisture uptake is reached; accelerated conditioning in water at 60°C is sometimes used but may cause surface whitening in glass-filled grades. The moisture uptake shifts the glass transition, so painted or plated parts should be conditioned before surface finishing.
The amorphous polyamide matrix has lower resistance to polar solvents than PA66, particularly at elevated temperature. Exposure to hot glycol-based engine coolant at 80°C or above can cause surface crazing and loss of tensile strength. Resistance to hydrocarbons and engine oils is generally acceptable at ambient temperature, but validation according to ISO 175 is required for any fluid-contact application. Avoid storing moulded parts in direct sunlight without UV stabilisation; amorphous PA can discolour and embrittle under prolonged outdoor weathering.
Regulatory status is grade-specific and batch-specific. The following matrix lists the typical checks; it does not replace a certificate of compliance from LG Chemical.
| Requirement | Standard or regulation | Status for K-10G55ST |
|---|---|---|
| REACH SVHC | Regulation (EC) No 1907/2006 as amended | Confirm current SDS; no SVHC above 0.1 wt% expected |
| RoHS | 2011/65/EU plus (EU) 2015/863 | Below maximum concentration values for Pb, Hg, Cd, Cr(VI), PBB, PBDE, DEHP, BBP, DBP, DIBP |
| FDA food contact | 21 CFR 177.1500 | Not assumed for glass-reinforced impact-modified grade; confirm if required |
| UL flammability | UL 94 HB | Current Yellow Card should be checked; this grade is not flame-retarded |
| Hot-water service | ISO 175 | Not recommended above 80°C continuous contact |
Batch-to-batch variation in glass content is typically controlled to ± 1.0–2.0 wt% in commercial glass-fibre polyamide grades; this variation can shift flexural modulus by several hundred megapascals. Incoming inspection of moulded test bars to ISO 527-2 and ISO 178 is recommended for critical structural programs. Fibre orientation differences between the edge and core of thick sections also create through-thickness property gradients; these gradients are visible in cross-polarised microscopy and should be accounted for in finite-element simulations.
Applications for this product class include automotive structural brackets, exterior mirror housings, power-tool chassis, and precision electrical equipment frames. In automotive lighting housings, the low mould shrinkage reduces optical axis shift after exposure to humid-air ageing. For electrical applications, comparative tracking index and dielectric strength should be measured on moulded plaques according to IEC 60112 and ASTM D149-20 respectively. The grade is not inherently flame-retardant; UL 94 HB is the typical classification for the unfilled amorphous PA family, but the current Yellow Card should be consulted for the glass-reinforced ST product.
Limitations of LUXY K-10G55ST include sensitivity to moisture during processing, lower chemical resistance than semi-crystalline PA66, and reduced flow length compared with unfilled amorphous PA. Drying must not be skipped when relative humidity exceeds 60%; material stored in open silos should be re-dried to ≤ 0.10% moisture before moulding. The grade is not intended for direct food contact or for continuous hot-water service above 80°C. Avoid prolonged contact with strong acids, oxidising agents, and hot polar solvents. If a flame-retardant system is required, a devoted FR grade rather than a super-tough GF55 grade should be selected.
