| HS Code | 772582 |
| Thermal Conductivity | 3.0 W/m-K |
| Specific Gravity | 1.42 g/cm³ |
| Water Absorption 24 Hr | 0.18% |
| Tensile Strength At Break | 79 MPa |
| Elongation At Break | 1.5% |
| Flexural Modulus | 11.0 GPa |
| Flexural Strength | 124 MPa |
| Notched Izod Impact | 37 J/m |
| Heat Deflection Temperature At 264 Psi | 170 °C |
| Melting Point | 215 °C |
| Volume Resistivity | 1.0E+14 ohm-cm |
| Dielectric Strength | 20 kV/mm |
As an accredited Avient Therma-Tech™ NJC-7500 TC Nylon 12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied as pellets in sealed 25 kg bags; keep dry and reseal after use to prevent moisture absorption. |
| Container Loading (20′ FCL) | 20′ FCL: palletized bags of Avient Therma-Tech™ NJC-7500 TC Nylon 12, securely loaded and braced to prevent shifting during transit. |
| Shipping | Avient Therma-Tech™ NJC-7500 TC Nylon 12 ships as a non-hazardous thermoplastic compound in sealed moisture-barrier bags or drums. Standard ground freight is suitable; keep containers dry and avoid extreme heat or humidity. No special hazmat labeling required, though handling with standard PPE is recommended. |
| Storage | Store Avient Therma-Tech™ NJC-7500 TC Nylon 12 in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep containers tightly sealed when not in use to prevent moisture absorption and contamination. Avoid storing near strong oxidizers or incompatible chemicals. Maintain moderate temperatures and protect from mechanical damage. |
| Shelf Life | Shelf life is typically two years from manufacture if stored sealed, cool, and dry. Avoid moisture exposure. |
In high-lumen LED troffer retrofits, the NJC-7500 TC moulded heat sink is specified only where the wiring compartment is separated from the driver by a Class II double-insulation barrier under IEC 60598-1. Melt temperature is held at 250–260°C. Mould temperature is maintained at 70–85°C for surface replication and to minimise frozen-in orientation stress. Predrying is executed at 80°C for 4 h to reduce moisture below 0.12 %; when ambient relative humidity exceeds 60 %, the drying interval is extended to 6 h. Screw back pressure is set to 0.4–0.7 MPa because higher back pressure shears the thermally conductive filler and lowers through-plane heat transfer measured by ASTM D5470. Injection speed is split into three zones: 80 mm/s at the sprue, 50 mm/s within the fin array, and 15 mm/s at the last-fill region. Vents along fin roots are cut to 0.020 mm depth. Weld lines are not acceptable across the LED mounting pad. Two side gates feed the pad to position the weld line in a low-flux rib. The ratio of fin height to root thickness is maintained at 2:1; ribs thinner than 0.8 mm cause premature freeze-off. UL 94 V-0 at 1.5 mm is evaluated on a plaque with the same flow length as the production part, not on a laboratory disc. Terminal components are 1200–2200 lm downlight and track-light heat sinks where the exposed surface temperature is held below 70°C by the luminaire design.
Underhood ECU housings are exposed to 85°C continuous air, occasional ethylene glycol/water spray, and vibration loads from 5–200 Hz. Aluminium ADC12 housings provide shielding but add mass and require secondary machining for flat gasket surfaces. The PA12-based compound is moulded to a flange flatness of 0.10 mm across a 120 mm sealing span, which is achievable when mould temperature is controlled to ±3°C across the fixed and moving halves. The tool uses 3 hot-drop gates at the screw bosses to avoid air traps. Pack pressure is 60–80 MPa for 6 s. After gate freeze, the screw rotates at 100–120 rpm to shorten cycle time. Regrind is limited to 15 wt%; ground runner scrap with dust below 0.25 mm particle size is removed because fine filler particles shift thermal conductivity and reduce impact strength. Surface resistivity is checked by IEC 60093, and mechanical acceptance is verified by ISO 527-2 tensile, ISO 179/1eU impact at 23°C, and ISO 75-2/A HDT. Terminal product is a sealed 12-channel ECU for 48 V mild-hybrid power distribution, where the compound eliminates a secondary anodising line but does not replace the nickel-plated internal shield frame.
Prismatic lithium-ion modules use coolant manifolds moulded from thermally conductive nylon 12 when the coolant is 50/50 water–ethylene glycol at 60°C and line pressure remains below 0.8 bar. The grade is selected over PA66 because ISO 62 equilibrium moisture at 50 % RH is approximately one-quarter to one-third that of PA66. Wall sections are 1.5 mm for the manifold body and 0.9 mm for the cell spacer ribs. The rib-to-wall ratio is held at 0.6 to avoid sink marks on the cell contact faces. The tool is a 2+2 family mould with sequential valve gating. Gate opening is delayed until the previous flow front has passed the opposite boss; this displaces weld lines into non-structural flanges. Melt temperature is 255°C and holding pressure is 55–65 MPa. Dry-before-moulding is performed at 80°C for 5 h. Burst strength is checked on a 150 mm manifold segment at 2.5 bar for 10 min, not as a substitute for module-level leak testing. Electrical insulation is verified by IEC 62631-3-1 volume resistivity. Thermal path performance is geometry-dependent; published datasheet values must be supplemented by heat flux testing because the filler orientation changes between the gate and end-of-fill regions. Terminal product is a leak-proof cooling frame that replaces a two-piece aluminium cold plate and electrically isolates the compression pads from the module end plates.
| Parameter | LED Heat Sink | Underhood ECU | Battery Manifold |
|---|---|---|---|
| Melt temperature | 250–260°C | 250–260°C | 255°C |
| Mould temperature | 70–85°C | ±3°C control | 70–80°C |
| Regrind limit | 10 wt% | 15 wt% | 10 wt% |
| Hold pressure | 50–70 MPa | 60–80 MPa | 55–65 MPa |
| Primary standard | ASTM D5470 | IEC 60093 | IEC 62631-3-1 |
Air compressor intercooler end caps are moulded only when the maximum discharge air temperature does not exceed 110°C. Above this boundary, PA12 softens at the hose barb sealing interface and leaks develop at the O-ring groove. The part is designed with a 2.0 mm wall and a 1.5 mm O-ring groove floor. Moulding is performed on a 120 t hydraulic press with a single sprue gate at the centre of the pipe boss. Melt temperature is 245–255°C. Mould temperature is 60–80°C. Screw back pressure is 0.3 MPa. No regrind is permitted because the compressed-air application must pass a 16 bar hydrostatic proof at 23°C and a 10 bar hot-air proof at 90°C. The O-ring groove fill ratio is 75 %; lower values cause extrusion blowout, higher values increase assembly insertion force. The compliance path is ISO 9080 for long-term hydrostatic strength and ISO 228-1 for threaded port dimensions. Terminal product is a pair of flanged end caps on a 60 mm diameter aluminium fin-and-tube core.
On a 48 V integrated starter-generator, the resolver stator housing is thinned to 0.9 mm to fit a 14 mm bearing bore pitch. The melt is front-loaded through a single ring gate. Barrel temperatures are 250°C at the feed zone, 260°C at the metering zone, and 255°C at the nozzle. Injection is profiled: 60 mm/s through the bearing boss, 35 mm/s along the radial web, and 10 mm/s at the outer terminal shroud. The weld line is moved to the terminal shroud, away from the resolver pole face. Packing pressure is 70 MPa for 3 s. After demoulding, the part is annealed at 90°C for 2 h to stabilise crystallinity. The ratio of terminal insert length to wall thickness is kept at 3:1 to prevent gas entrapment. The compound is specified only if the surface temperature at the resolver remains below 105°C; for hotter stator positions, a PPS-based thermal compound is substituted. The terminal product is a sensor housing that survives 3,000 thermal cycles from −40°C to 90°C without surface cracks.
| Property assessed | Test method | Acceptance input |
|---|---|---|
| Thermal conductivity | ASTM D5470 | Supplier datasheet value plus in-mould flow-path correlation |
| Tensile modulus and strength | ISO 527-2 | Supplier datasheet value for conditioned and dry-as-moulded states |
| Charpy impact | ISO 179/1eU | Minimum notched and unnotched values by end-use load case |
| Deflection temperature | ISO 75-2/A | Reported HDT at 1.8 MPa |
| Volume resistivity | IEC 62631-3-1 | Reported insulation value at 500 V DC |
| Flammability | UL 94 | Reported rating at specified final wall thickness |
| Moisture uptake | ISO 62 | Equilibrium uptake at 23°C / 50 % RH |
| Global chemical compliance | REACH 1907/2006, RoHS 2011/65/EU as amended 2015/863 | Supplier declaration for production batch |
For a 5G small-cell radio housing with an internal RF power amplifier dissipating 18 W, the enclosure is moulded with a 2.5 mm wall. The thermal path is a snap-fitted aluminium extrusion insert overmoulded with the compound. The nylon 12 base provides lower equilibrium water uptake than PA6 or PA66. This keeps the post-machined thread insert bores within ±0.06 mm after 21 days at 60 % RH. The ratio of overmoulded boss diameter to the aluminium insert outer diameter is 1.6:1. Moulding uses a 180 t press. Melt temperature is 250°C. Mould temperature is 80°C. Holding pressure is 50–60 MPa for 5 s. The material must meet UL 94 HB at 3.0 mm for the outdoor housing and IEC 60529 IP67 after 500 h of UV conditioning per ISO 4892-2. Terminal product is a sealed, convective-cooled telemetry enclosure, where RF shielding is provided by a separate nickel-plated inner frame, not by the compound. Published data for this specific configuration is limited when the insert overmoulding creates a non-uniform thermal interface; therefore thermal validation is conducted on the complete assembly rather than on flat plaques.
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Avient Therma-Tech™ NJC-7500 TC Nylon 12 is a thermally conductive polyamide 12 compound supplied as injection-moulding pellets. The grade belongs to the Therma-Tech™ family of heat-dissipating thermoplastics, in which a polyamide 12 matrix is modified with a thermally conductive filler system. The TC designation separates it from unfilled PA12 and from electrically conductive or EMI shielding grades that may rely on metallic or graphitic pathways. The intended processing route is injection moulding of thermal management components such as LED heat sinks, power-electronics housings, sensor bodies, and automotive brackets that require heat transfer in combination with chemical resistance and dimensional stability.
Because certified lot-specific values for NJC-7500 TC Nylon 12 are not reproduced in this source, the following sections describe the property envelope typical for thermally conductive PA12 compounds and the standard test methods used to verify them. The base polymer is designated by ISO 1043 as PA12 and by ASTM D6779 as PA12. Unlike PA6 or PA66, PA12 has a longer aliphatic repeating unit; this leads to lower equilibrium moisture uptake, lower unfilled density, and lower melting temperature. When filled with thermally conductive particles, the compound shifts from the unfilled density of approximately 1.01 g/cm³ to a value that depends on filler type, filler volume fraction, and processing.
The product should not be treated as a drop-in replacement for unfilled nylon 12 in mechanically demanding snap-fit or living-hinge features. Filler addition increases melt viscosity, reduces tensile elongation at break, and can produce anisotropic shrinkage and directional thermal conductivity. Selection requires a combined review of thermal load, mechanical load, chemical exposure, and moulding constraints.
Pre-drying is mandatory. Polyamide 12 absorbs moisture at a lower rate than PA6 or PA66, but hydrolysis at melt temperatures above 250 °C can still reduce molecular weight. Desiccant drying at 80 °C for 4 h to 8 h with a dew point below -30 °C is a typical starting point for filled PA12 compounds. A residual moisture level below 0.10 % is generally recommended before melt processing to avoid surface splay, voiding, and loss of mechanical properties. Vacuum drying may be used on smaller batches if the drying chamber maintains the same dew point and temperature.
Barrel temperatures for PA12 compounds are generally set between 230 °C and 270 °C, with the nozzle set at or slightly below the front-zone temperature to reduce drooling. The exact profile depends on filler loading; conductive ceramic or mineral fillers raise viscosity and require better plastication. Production-scale equipment running thermally conductive grades typically uses a general-purpose screw with an L/D ratio of 18:1 to 24:1 and a compression zone of moderate length. Abrasive fillers increase screw and barrel wear. Hardened screws, bimetallic barrels, and wear-resistant screw tips are specified on manufacturing lines running consecutive batches of filled thermally conductive compounds.
Mould temperature influences surface finish, crystallinity, and dimensional stability. PA12 crystallizes slowly enough that mould temperatures of 40 °C to 80 °C are used for filled grades. Higher mould temperatures promote crystallinity and reduce post-mould shrinkage but extend cycle time. Injection speed should be adjusted to avoid jetting and to fill thin-wall sections before freeze-off. Fill times below 1.0 s are often required for housing walls thinner than 1.5 mm, but gate size and runner balance must be evaluated to avoid excessive shear heating and material degradation. A shut-off nozzle is preferred because PA12/filler melts can drool at processing temperature.
| Parameter | Typical range | Equipment or basis |
|---|---|---|
| Desiccant drying temperature | 80 °C | Desiccant dryer with dew point below -30 °C |
| Drying time | 4 h to 8 h | Hopper dryer or vacuum dryer |
| Melt temperature | 230 °C to 270 °C | Nozzle thermocouple |
| Mould temperature | 40 °C to 80 °C | Water or oil mould-temperature control unit |
| Screw L/D ratio | 18:1 to 24:1 | General-purpose injection moulding screw |
| Back pressure | 0.3 MPa to 0.7 MPa | Hydraulic or electric injection unit |
| Thin-wall fill time | below 1.0 s | Moulding machine injection speed |
In unfilled PA12, thermal conductivity is approximately 0.23 W/(m·K) to 0.30 W/(m·K) depending on crystallinity, temperature, and moisture content. For thermally conductive grades, particulate fillers such as boron nitride, aluminium oxide, graphite, or hybrid ceramic/mineral systems are dispersed at loadings sufficient to create percolating thermal pathways through the polymer. The resulting through-plane thermal conductivity is usually lower than in-plane thermal conductivity because filler particles align with the melt flow direction during injection moulding. Anisotropy of 1.5:1 to 3:1 between in-plane and through-plane values is common in filled thermoplastics and must be accounted for in heat sink design.
Thermal conductivity is not a single intrinsic property in filled plastics. Laser flash methods such as ASTM E1461 measure thermal diffusivity and require density and specific heat to calculate conductivity. Guarded heat flow methods such as ASTM E1530 measure through-plane resistance. Transient plane source methods under ISO 22007-2 may report bulk values but can be sensitive to contact resistance and sample heterogeneity. For thin-wall parts, through-plane thermal conductivity is the limiting design parameter; for planar heat spreaders, in-plane conductivity dominates. Requests for a single W/(m·K) figure should specify test method, sample thickness, flow direction, and measurement temperature.
The transition from a dielectric unfilled matrix to a thermally conductive compound does not automatically produce electrical conductivity. Many TC grades use electrically insulating ceramics to maintain dielectric isolation between live electrical components and heat sinks. Graphite-filled or metal-filled grades may be both thermally and electrically conductive. The electrical character of NJC-7500 TC should be confirmed using ASTM D257 or IEC 62631-3-2 before application near exposed circuitry.
When exposure to moisture, automotive fuels, and cold-temperature impact is a design constraint, the nylon 12 base of NJC-7500 TC provides specific advantages over PA6 and PA66 thermally conductive compounds. According to ISO 62, unfilled PA12 absorbs less water than PA6 or PA66 at both 23 °C, 50 % RH and saturation. This reduces the property drift caused by moisture plasticization and reduces dimensional change in humid service. In thermally conductive formulations, the polymer matrix remains the primary moisture-sensitive phase; filler particles reduce the weight-percent moisture uptake relative to the total compound because the filler does not absorb moisture. The polymer-rich surface layer still responds to humidity.
Chemical resistance of PA12 to aliphatic hydrocarbons, oils, and greases is generally stronger than that of PA6. This makes thermally conductive PA12 suitable for engine-compartment and gearbox-adjacent components where occasional oil mist or fuel vapour is present. Resistance to methanol, glycol, and strong acids is limited; prolonged contact with hot polar solvents should be validated under service conditions. Stress-cracking resistance is influenced by filler content. Sharp radii, metal inserts, and high residual stress can initiate failure before the chemical resistance of the base polymer becomes the limiting factor.
Low-temperature toughness is another differentiation. PA12 remains less brittle at sub-zero temperatures than PA66 at equivalent moisture content. However, high filler loadings reduce elongation and impact strength. The designer should compare notched impact values under ISO 179-1 or ASTM D256 at the actual service temperature rather than at 23 °C only.
For material selection between unfilled PA12, thermally conductive PA12, and thermally conductive PA66, Table 1 summarises qualitative differences and documented class-level ranges. The values for NJC-7500 TC are not reproduced because the certified datasheet is not accessible in this source; the table therefore uses published class-level properties from ISO and ASTM methods to guide material selection, not to replace grade-specific certification.
| Property | Unfilled PA12 | Thermally conductive PA12 class | Thermally conductive PA66 class |
|---|---|---|---|
| Density by ISO 1183-1 | approximately 1.01 g/cm³ | typically 1.3 g/cm³ to 1.8 g/cm³ | typically 1.4 g/cm³ to 1.9 g/cm³ |
| Moisture uptake at 23 °C, 50 % RH by ISO 62 | 0.7 % to 0.9 % | lower than unfilled PA12 on total weight basis due to filler dilution | higher than PA12 class |
| Through-plane thermal conductivity | 0.23 W/(m·K) to 0.30 W/(m·K) | 1 W/(m·K) to 10 W/(m·K) typical for thermally conductive grades | 1 W/(m·K) to 10 W/(m·K) typical for thermally conductive grades |
| Polymer melting peak | 172 °C to 178 °C | 172 °C to 178 °C polymer matrix | 255 °C to 265 °C polymer matrix |
| Chemical resistance to aliphatic hydrocarbons | high | high, restricted by filler/polymer adhesion | moderate |
| Low-temperature impact | high | reduced by filler loading | lower and more temperature-sensitive |
Compared with unfilled PA12, the thermally conductive grade exchanges elongation, weld-line strength, and processability for heat transfer. Tensile modulus rises because rigid filler increases stiffness; tensile strain at break falls. Weld lines are more brittle because filler-rich surfaces meet with limited polymer chain entanglement. Parts with multiple gates or holes should relocate weld lines away from thermal and mechanical load paths. Compared with thermally conductive PA66, the PA12 grade generally offers lower moisture uptake and lower density, but lower heat deflection temperature and lower modulus at elevated temperature. The selection therefore depends on whether the component sees humid or hydrocarbon environments rather than dry heat alone.
The thermal conductivity gap between polymer compounds and die-cast aluminium remains large. Even highly filled thermoplastics typically operate below 20 W/(m·K), while aluminium alloys are in the range of 100 W/(m·K) to 200 W/(m·K). For this reason, NJC-7500 TC Nylon 12 should not be specified as a direct thermal replacement for metal heat sinks without re-evaluating fin thickness, surface area, and airflow. The material’s application value lies in weight reduction, corrosion resistance, part consolidation, and electrical isolation where the heat load is moderate and where service conditions favour the PA12 matrix.
For applications requiring moderate heat transfer combined with resistance to oil mist, fuel vapour, and humidity, NJC-7500 TC Nylon 12 is evaluated using through-plane conductivity data, ISO 62 moisture uptake, ISO 179-1 or ASTM D256 impact, and moulding trials that confirm weld-line strength and filler orientation. Published data for this specific configuration is limited; therefore the grade-specific datasheet, UL card where applicable, and end-use thermal cycling validation remain mandatory before production release.
