| HS Code | 670466 |
| Density | 1.22 g/cm³ |
| Tensile Modulus | 7000 MPa |
| Tensile Stress At Break | 120 MPa |
| Tensile Strain At Break | 3% |
| Flexural Modulus | 6200 MPa |
| Flexural Strength | 170 MPa |
| Charpy Impact Strength Notched 23 C | 8 kJ/m² |
| Melting Temperature | 178 °C |
| Heat Deflection Temperature 1 8 Mpa | 150 °C |
| Vicat Softening Temperature | 170 °C |
| Water Absorption 24h At 23 C | 0.30% |
| Linear Mold Shrinkage | 0.3-0.6% |
As an accredited Evonik VESTAMID LC-GF23 NC Nylon 12, 23% Glass Fiber Reinforced factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied as ready-to-process pellets in 25 kg moisture-proof bags, packaged on pallets and shrink-wrapped for safe transport and storage. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with Evonik VESTAMID LC-GF23 NC Nylon 12, 23% glass fiber reinforced, securely packed for shipment. |
| Shipping | Ship as non-hazardous material in sealed, moisture-proof packaging to prevent water absorption. Store in a cool, dry area away from direct sunlight and heat sources. Use standard freight handling; avoid puncturing bags or containers. Protect from excessive dust accumulation and ensure proper labeling. No special transportation restrictions apply. |
| Storage | Store VESTAMID LC-GF23 NC in its original, unopened packaging in a cool, dry, well-ventilated area. Keep away from direct sunlight, UV radiation, excessive heat, and moisture sources. Reseal containers tightly after use. Under recommended conditions, shelf life is typically 2 years from delivery. |
| Shelf Life | Shelf life is typically 2 years when stored in original sealed packaging in a cool, dry place. |
On heavy-duty truck and bus pneumatic brake distribution assemblies, VESTAMID LC-GF23 NC is injection-moulded into push-to-connect couplings, manifold bodies, and threaded ports for air service circuits with maximum working pressure 12.5 bar and temperature cycling from -40 °C to 100 °C. The 23 wt% glass-fibre loading, verified by ashing according to ISO 3451-1:2019, provides the flange rigidity needed to resist fitting blow-out at thread loosening torques between 8 N·m and 20 N·m; unfilled PA12 is not substituted beyond 10 wt% because creep modulus under hot air pressure drops below the design floor for annealed thread bosses. Before moulding, the compound is dried at 80 °C to residual moisture no greater than 0.10 wt%, measured by ISO 15512 Method A. Processing occurs on hydraulic injection moulding machines of 100 t to 180 t clamp force, with barrel zones set between 240 °C and 270 °C, hot-runner manifold at 250 °C, and mould temperature controlled between 60 °C and 80 °C. Glass-fibre orientation is directed by placing gates at sections no less than 2.5 mm wall thickness; weld lines are relocated to low-stress bosses by sequential valve gates. Regrind addition is limited to 20 wt% in virgin granulate, and PA12-based colour concentrate is added at 1.0 wt% to 2.0 wt% when non-natural tinting is required. End components include trailer emergency couplings, air dryer manifold seals, cab tilt valve blocks, and ABS solenoid valve housings that must satisfy SAE J2494-1 pressure cycling and DIN 74324-2 dimensional stability requirements.
Electric vehicle battery coolant circuits operate at nominal 80 °C to 90 °C with spikes to 105 °C during fast charging, using a 50:50 vol% ethylene glycol/water mixture. In VESTAMID LC-GF23 NC quick connectors, residual moisture from improper drying reacts with glass-fibre sizing and matrix at melt temperatures above 260 °C, producing micro-voids that reduce burst-pressure retention after 1,000 h coolant ageing at 105 °C. The material is dried to 0.10 wt% moisture or less; visible splay at gate regions on cold-runner machines with melt residence time above 8 min indicates hydrolytic degradation. For addition ratio, regrind is capped at 20 wt%, while a PA12-carrier lubricant masterbatch is used at 0.5 wt% to 1.0 wt% to reduce screw torque, not more, because higher loads depress weld strength. Laser transmission welding of natural NC to black PA12-GF23 variants uses a 980 nm diode laser with power between 80 W and 150 W at 2 mm wall thickness; higher power burns the weld rib, lower power produces cold welds with porosity. Compliance testing follows ISO 527-1:2019, ISO 178:2019, and ISO 179-1/1eA:2010, with additional freeze-thaw cycles from -40 °C to 105 °C per customer battery cooling specifications. Terminal products include battery pack quick connectors, cooling plate inlet elbows, degas bottle nipples, and manifold distribution blocks.
Batch-to-batch variance in fibre length after screw plastication is a known bottleneck on production-scale equipment: if screw speed is held above 150 min⁻¹ and back pressure above 50 bar, glass-fibre attrition rises and burst strength decreases by shifting failure to weld lines. On general-purpose screws of 20:1 to 24:1 L/D, the measured fibre length distribution after plastication is typically log-normal with number-average fibre length between 0.2 mm and 0.4 mm; excessive shear pulls the tail below 0.15 mm, which reduces notched impact and weldline fracture resistance. Gate placement, screw design, and melt residence time therefore govern the difference between a compliant quick-connect and a batch that passes dry tensile testing but leaks after thermal ageing.
| Blend parameter | Allowed range | Reference method |
|---|---|---|
| Glass fibre content | 21 wt% to 25 wt% | ISO 3451-1:2019 |
| Unfilled PA12 dilution | 0 wt% to 10 wt% | Internal melt-blend control |
| Regrind addition | 0 wt% to 20 wt% | Dry reclaim after moisture check |
| PA12-based colour masterbatch | 1.0 wt% to 2.0 wt% | Visual dispersion and surface finish |
| High-shear lubricant masterbatch | 0.5 wt% to 1.0 wt% | Injection screw torque reduction |
| Residual moisture after drying | ≤ 0.10 wt% | ISO 15512 Method A |
| Barrel melt temperature | 240 °C to 270 °C | Machine zone profile |
| Mould temperature | 60 °C to 80 °C | Surface finish and crystallinity control |
Motorcycle fuel tank pump flanges and automotive evaporative emission canister brackets moulded in VESTAMID LC-GF23 NC are required to withstand continuous exposure to gasoline, 10 vol% ethanol, and methanol blends, where PA12 offers lower water uptake than PA6/PA66 and better retained impact at -40 °C. The glass content is maintained at 23 wt%; regrind addition up to 20 wt% is permissible only from dried, uncontaminated runners, and any PA6/PA66 regrind contamination must remain below 2 wt% to avoid interfacial crystallization and embrittlement. Injection moulding proceeds with melt temperatures between 250 °C and 270 °C, mould temperatures 60 °C to 90 °C, and screw rotation speeds below 150 min⁻¹ to limit fibre attrition. After-moulding annealing at 120 °C for 2 h may be specified to stabilize dry dimensions before assembly because post-shrinkage in contact with fuel can change seal boss flatness. Material acceptance references SAE J1681:2000 for fuel compatibility, ISO 175:2010 for chemical immersion, and UL 94 HB for ignition resistance. Terminal parts include fuel pump flanges, filler neck retainers, rollover valve seats, and carbon canister mounting brackets.
In water treatment and agricultural dosing equipment, VESTAMID LC-GF23 NC is selected for pump casings, valve bodies, and filter heads exposed to 5 wt% calcium chloride brine, weak acids, and aliphatic hydrocarbon cleaning fluids. The 23 wt% glass-fibre reinforcement provides the stiffness required for flanged seals at system pressures up to 10 bar, while the PA12 matrix limits water absorption to roughly 1.5 wt% at saturation, compared with higher values for PA6 or PA66 grades. To prevent surface bloom after 500 h salt spray at 35 °C per ISO 9227:2017, additive levels are deliberately constrained: no more than 0.5 wt% of a low-volatile internal release masterbatch, no external zinc stearate dusting, and no PA6-carrier colour concentrate. A 1.0 wt% addition of PA12-based black masterbatch is typical for weatherable black housings; higher pigment loadings can reduce notched Charpy impact strength because pigment agglomerates act as crack initiation sites, and the exact reduction is batch-dependent and must be verified by notched specimens per ISO 179-1/1eA:2010. Injection moulding uses a melt temperature of 255 °C, mould temperature 70 °C, and pack pressure between 400 bar and 600 bar to densify glass-fibre webs around valve seat inserts. Qualification includes ISO 175:2010 immersion in 5% CaCl₂ at 60 °C, ISO 62:2008 water absorption, and ISO 178:2019 flexural modulus retention after exposure. Even when mechanical and chemical resistance data are acceptable, potable-water contact requires end-use NSF/ANSI 61 evaluation because certification is formulation-specific and cannot be assumed for the 23 wt% glass-filled natural compound. Terminal components include chemical metering pump casings, water softener control valves, irrigation filter heads, and peristaltic pump rotor housings.
Process conflicts arise when moulders add high levels of external lubricant to reduce demoulding force: at concentrations above 1.0 wt%, the additive migrates to the surface during 80 °C continuous service and forms a visible bloom after 500 h salt spray, which is falsely attributed to chemical attack. The recommended production route is a polished chrome-plated mould combined with a low-release masterbatch at 0.3 wt% to 0.5 wt% instead of external sprays. Silicone-based mould release sprays should be avoided around valve seat inserts because they prevent ultrasonic welding and create leak paths under cyclic pressure.
| Application sector | Key standard or test protocol | Conditional range | Acceptance criterion |
|---|---|---|---|
| Heavy truck air brake | SAE J2494-1, DIN 74324-2 | -40 °C to 100 °C, 12.5 bar | No burst; no fitting detachment after specified cyclic pressure schedule |
| EV coolant quick connectors | ISO 527-1:2019, ISO 178:2019 | 50:50 vol% EG/water, 105 °C | No leakage or port cracking after thermal ageing |
| Motorcycle fuel system | SAE J1681:2000, ISO 175:2010 | Gasoline with 10 vol% ethanol | No surface crazing or seal boss flatness shift after immersion |
| Water and chemical dosing | ISO 9227:2017, ISO 175:2010 | 5% CaCl₂, 500 h | No visible bloom or flexural modulus loss beyond OEM limit |
| Rail cable ducting | EN 45545-2:2020 R22 | Non-structural interior zones | End-use fire certification required; no assumed HL3 compliance |
| Data centre liquid cooling | IEC 60695-2-12, UL 94 HB | Glow-wire 850 °C | No ignition in end-use assembled part |
Rail interior cable duct brackets and side-channel clips made of VESTAMID LC-GF23 NC are used where low smoke and moderate mechanical load occur, but the non-flame-retarded PA12-GF23 grade has a defined operational ceiling. Under EN 45545-2:2020 R22 interior components, this specific natural PA12-GF23 material without flame-retardant modification is generally not suitable for HL3 use; published data for this configuration is limited, and end-use fire testing is mandatory. When used in non-structural low-fire-risk zones, the 23 wt% glass content is retained, and a PA12-carrier black masterbatch is added at 1.5 wt% to 2.0 wt% for UV-stable dark finishes; adding more than 2.0 wt% causes measurable notched impact loss because pigment agglomerates act as crack initiation sites. Moulding is performed with melt temperature 245 °C, mould temperature 70 °C, and holding pressure 500 bar; wall thickness below 1.5 mm is avoided because glass-fibre packing becomes non-uniform and notch sensitivity increases. Notched Charpy impact values are measured per ISO 179-1/1eA:2010, tensile modulus per ISO 527-2:2012, and heat deflection temperature per ISO 75-2:2013 Method A at 1.8 MPa. Terminal products include railway cable duct brackets, cable tie anchor plates, and conduit connection clips.
Server rack liquid cooling manifolds and data centre cold-plate quick disconnects rely on VESTAMID LC-GF23 NC for dimensional stability in dry indoor environments where relative humidity is maintained at 40% to 60%. Because the PA12 matrix absorbs less than 1.0% moisture at these conditions, the 23 wt% glass-filled compound retains consistent port-to-port centre distances on manifolds with up to 8 quick-disconnect ports. The processing ratio allows 20% regrind maximum, but only from dried, moulded sprues and runners; mixed colour batches require a 1.0 wt% addition of a heat-stable PA12 colour concentrate. Injection moulding is performed on electric screw machines with a shot volume filled to 60% to 80% of barrel capacity and a melt residence time below 10 min to limit fibre breakage and hydrolysis. Compliance is referenced to IEC 60695-2-12 glow-wire 850 °C for unattended electrical accessories, UL 94 HB, and ISO 527-1:2019 tensile testing. Terminal products include data centre cold-plate manifolds, quick-disconnect coupling bodies, and liquid cooling distribution blocks.
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Evonik VESTAMID LC-GF23 NC is a natural-color, 23% by weight short-glass-fiber-reinforced nylon 12 compound within the VESTAMID L polyamide 12 family. The NC suffix denotes natural color; the LC designation should be verified against the supplier’s grade-specific documentation because published data for this exact configuration can be limited in some regional technical databases. The glass phase at 23% by weight corresponds to approximately 10.6 vol% when calculated using a glass density of 2.54 g/cm³ and a PA12 matrix density of 1.01 g/cm³. The compound is supplied as pellets for injection molding and extrusion of semistructural components where the low moisture absorption, chemical resistance, and hydrolytic stability of nylon 12 are required alongside elevated tensile modulus and reduced thermal expansion. The material is not a flexible tubing grade; the reinforcement restricts elongational ductility and shifts the mechanical response toward load-bearing, dimensionally stable, creep-resistant parts.
The introduction of 23% glass fiber into polyamide 12 produces a discontinuous short-fiber composite with strongly anisotropic flow-direction properties. In dry-as-molded condition, the tensile modulus rises from approximately 1.4–1.6 GPa for unfilled VESTAMID L to 5.0–6.5 GPa for the reinforced grade, depending on fiber orientation, fiber length retention, and test specimen preparation. Tensile strength at break typically lies in the range of 85–110 MPa under ISO 527-2, while elongation at break falls to 3–6%. The glass phase therefore removes the characteristic high-stretch ductility of unreinforced nylon 12 and substitutes load-bearing stiffness, at the cost of increased notch sensitivity and reduced weld-line strength. Charpy notched impact values in the dry state are commonly reported between 7–11 kJ/m² under ISO 179-1/1eA, and conditioned values can be higher after moisture uptake.
Dimensional stability under thermal stress is improved. The heat deflection temperature under 0.45 MPa load, measured according to ISO 75-2/B, is in the region of 165–175°C, whereas unfilled PA12 commonly falls below 120°C at the same load. The coefficient of linear thermal expansion in the flow direction is suppressed to roughly 2.5–5 × 10⁻⁵ K⁻¹ under ISO 11359-2, compared with 12–14 × 10⁻⁵ K⁻¹ for the unfilled polymer. Transverse expansion remains higher because fiber orientation is primarily unidirectional in injection-molded plaques; the typical transverse CLTE range is 8–11 × 10⁻⁵ K⁻¹. This anisotropy must be accounted for in shrinkage and warpage simulation, particularly in flat parts with uneven wall thickness or single-edge gating.
| Property | Test method | LC-GF23 NC dry | LC-GF23 NC conditioned at 50% RH | Unfilled VESTAMID L dry |
|---|---|---|---|---|
| Density at 23°C | ISO 1183-1 | 1.23–1.26 g/cm³ | 1.23–1.26 g/cm³ | 1.01–1.02 g/cm³ |
| Tensile modulus | ISO 527-2 | 5,000–6,500 MPa | 3,200–4,200 MPa | 1,400–1,600 MPa |
| Tensile strength at break | ISO 527-2 | 85–110 MPa | 60–75 MPa | 45–50 MPa |
| Elongation at break | ISO 527-2 | 3–6% | 8–15% | >200% |
| Charpy notched impact at 23°C | ISO 179-1/1eA | 7–11 kJ/m² | 12–18 kJ/m² | 6–8 kJ/m² |
| Heat deflection temperature, 0.45 MPa | ISO 75-2/B | 165–175°C | 160–170°C | 100–120°C |
| Melting point | ISO 11357-3 | 176–180°C | 176–180°C | 176–180°C |
| CLTE flow direction | ISO 11359-2 | 2.5–5 × 10⁻⁵ K⁻¹ | 2.5–5 × 10⁻⁵ K⁻¹ | 12–14 × 10⁻⁵ K⁻¹ |
| Water absorption at 50% RH | ISO 62 | 0.6–0.8% | 0.6–0.8% | 0.7–0.8% |
Before melt processing, VESTAMID LC-GF23 NC is dried in a desiccant dryer at 80–90°C to a residual moisture level below 0.1%. A dew point of −40°C or lower is standard practice for glass-filled PA12. Melt temperature during injection molding is maintained between 220°C and 250°C, with mold wall temperature controlled from 40°C to 80°C. At temperatures above 260°C, residence time should be limited to less than 5 minutes, and excursions above 280°C initiate thermal-oxidative degradation of the PA12 matrix. A conventional three-zone reciprocating screw with L/D 20–22, compression ratio 2.0–2.5, and a reverse-cut check valve is adequate. Back pressure is typically held at 30–60 bar; screw speed is commonly 60–120 rpm. Excessive screw speed and high back pressure reduce retained fiber length and lower the final tensile modulus. The feed throat is kept at 40–60°C to inhibit pellet bridging without permitting moisture re-absorption. Mold shrinkage in flow direction is specified in the range of 0.2–0.5%, with transverse shrinkage often 0.5–0.8% depending on wall thickness, gate geometry, and fiber orientation. Weld-line regions show reduced load-bearing capacity because glass fibers orient parallel to the knit line; gate locations should be arranged to move weld lines away from high-tensile-stress areas. Hot-runner systems with low shear and generous flow channels reduce glass attrition. The use of general-purpose open nozzles is preferred over needle-type shutoff nozzles when the needle can create dead zones of stagnant glass-filled melt.
The principal difference from glass-reinforced PA6 and PA66 is the moisture response of the polyamide 12 matrix. At 50% relative humidity, PA12 absorbs approximately 0.6–0.8% water under ISO 62, while PA6 GF25 absorbs 2.5–2.8% and PA66 GF25 absorbs 2.3–2.7%. At water saturation, PA12 reaches roughly 1.5–2.0%, compared with 9.0–9.5% for PA6 and 8.0–8.5% for PA66. This lower equilibrium moisture content means the dry-to-conditioned property shift is smaller for VESTAMID LC-GF23 NC than for short-chain polyamide composites. The practical consequence is that dimensions, creep behavior, and stiffness remain more stable in humid automotive or outdoor service. Density is also lower: 1.23–1.26 g/cm³ versus 1.32–1.35 g/cm³ for glass-reinforced PA66. This produces a mass reduction of approximately 5–8% for identical part geometry. The melting point of PA12 is 176–180°C under ISO 11357-3, significantly below the 220–223°C melting point of PA6 and the 260–264°C melting point of PA66. Continuous-use temperature under mechanical load is therefore lower than that of PA66 and should be evaluated with application-specific heat aging data. The advantage is chemical performance: PA12 is specified in applications involving zinc chloride solutions, automotive oils, alcohols, and outdoor salt exposure where PA6 and PA66 are more prone to stress cracking. Immersion screening according to ISO 175 should be executed for critical fluid-contact parts. Flammability classification under UL 94 is commonly HB at typical wall thicknesses, but grade-specific documentation must be confirmed for final part thickness.
| Property | Test method | VESTAMID LC-GF23 NC | PA6 GF25 | PA66 GF25 |
|---|---|---|---|---|
| Density | ISO 1183-1 | 1.23–1.26 g/cm³ | 1.32–1.34 g/cm³ | 1.32–1.35 g/cm³ |
| Water absorption at 50% RH | ISO 62 | 0.6–0.8% | 2.5–2.8% | 2.3–2.7% |
| Water absorption at saturation | ISO 62 | 1.5–2.0% | 9.0–9.5% | 8.0–8.5% |
| Melting point | ISO 11357-3 | 176–180°C | 220–223°C | 260–264°C |
| Tensile modulus, dry | ISO 527-2 | 5,000–6,500 MPa | 6,000–7,500 MPa | 7,000–8,500 MPa |
| Relative moisture-induced stiffness loss | Derived from dry/conditioned ISO 527-2 data | 25–40% | 40–55% | 40–55% |
Candidate application categories for VESTAMID LC-GF23 NC include automotive fluid-line clips, brake-system retaining brackets, compressed-air line fittings, cable conduits, pump wear rings, sensor brackets, and industrial housings where PA6 or PA66 parts have failed through zinc chloride stress cracking or excessive moisture-induced dimensional drift. The grade is not intended for flexible air-brake tubing; PA12 extrusion tubing is covered separately by standards such as DIN 73378 and SAE J844. In reinforced form, the material is better matched to rigid attachment, clamping, and manifold components around those lines. Snap-fit designs are possible if strain at the snap-fit geometry is kept below the reduced elongation limit of the glass-filled grade, typically below 3% in dry parts and below 5% in conditioned parts. Sharp notches, thin ribs, and abrupt wall-thickness transitions should be avoided because the glass phase reduces crack initiation resistance. For outdoor applications, the low moisture uptake of PA12 supports retained dimensional accuracy and creep resistance. For parts exposed to hot glycol, concentrated acids, or prolonged contact with boiling water, compatibility testing under ISO 175 is required, as the chemical resistance of PA12 does not extend to all service fluids. Fiber orientation anisotropy must be included in mold-filling and warpage simulation; parts with unbalanced gating can show bowing or twist that is not predicted by isotropic shrinkage assumptions. The 23% glass level occupies an intermediate position between unfilled VESTAMID L and the higher-fiber-filled VESTAMID L-GF25 and L-GF30 grades, offering lower melt viscosity than 30% glass compounds and better stiffness than unfilled PA12, while retaining enough flow length for moderate-complexity injection molding tooling.
