| HS Code | 789203 |
| Density | 1.03 - 1.08 g/cm³ |
| Water Absorption 24h | 0.25 - 0.35% |
| Tensile Strength Ultimate | 50 - 65 MPa |
| Elongation At Break | 10 - 40% |
| Flexural Modulus | 2.0 - 2.9 GPa |
| Flexural Strength | 70 - 90 MPa |
| Izod Impact Notched | 30 - 80 J/m |
| Heat Deflection Temperature At 1 8 Mpa | 45 - 60 °C |
| Melting Point | 178 - 180 °C |
| Ul 94 Flammability | V-0 |
| Volume Resistivity | 1e+13 - 1e+14 ohm-cm |
| Dielectric Strength | 20 - 30 kV/mm |
As an accredited Overview of materials for Nylon 12, Flame Retardant factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg sealed bags, this flame-retardant Nylon 12 overview material offers detailed technical data for processing and applications. |
| Container Loading (20′ FCL) | 20′ FCL shipment of flame-retardant Nylon 12 materials, securely packed in standard export packaging, sealed, and transported as a full container load. |
| Shipping | Flame Retardant Nylon 12 (polyamide 12) resin, solid pellets. Not regulated as dangerous goods under IATA/IMDG/ADR in this form. No UN number required. Ship in sealed moisture-barrier packaging, avoid direct heat and ignition sources. Standard dry freight conditions are acceptable. Non-hazardous chemical description for transport documentation. |
| Storage | Store Nylon 12 Flame Retardant in a cool, dry, well-ventilated area away from direct sunlight and ignition sources. Keep containers tightly sealed to prevent moisture absorption, which can degrade properties. Avoid exposure to high temperatures or incompatible chemicals. Follow manufacturer guidelines to preserve flame-retardant performance and ensure safe handling. |
| Shelf Life | Shelf life is indefinite if stored dry, cool, and away from sunlight; avoid moisture absorption. |
In EV battery thermal management conduit production, a PA12 compound modified with 15–18 wt% aluminium diethylphosphinate and 0.8 wt% copper-based heat stabilizer is dried to 0.05 % residual moisture using closed-loop desiccant dryers at 80 °C for 4 h. Extrusion on a single-screw machine with 30:1 L/D and barrier mixing zones requires barrel set temperatures of 225–240 °C, die temperature 230 °C, and screw speed 25–35 min⁻¹ to limit residence time. At melt temperatures above 250 °C the organophosphinate begins to decompose, producing die drool and black specks; the production melt-temperature window is therefore held at ±5 °C around 235 °C. The resulting compound meets UL 94 V-0 at 1.0 mm and passes IEC 60695-2-12 glow-wire end-product testing at 850 °C for 2.0 mm wall stock. Comparative tracking index measured in accordance with IEC 60112 remains above 600 V when antimony trioxide is excluded from the formulation. Elongation at break measured to ISO 527-2 decreases to 12–16 %, so co-extruded conduit design places the flame-retardant layer outside a ductile PA12 inner liner. Production-scale failure modes include torque fluctuations from melt backpressure when regrind ratio exceeds 20 wt%, and post-extrusion warpage when water-bath temperature is below 20 °C. Finished conduits are used as coolant supply lines for 48 V and high-voltage battery packs, where the flame-retardant jacket prevents flame propagation along the bundle. Published data for hydrolysis resistance in glycol-water mixtures specific to this FR formulation is limited; OEM qualification therefore uses finished conduit assemblies rather than pellet-level accelerated ageing.
Representative FR system comparisons for unreinforced PA12 at 1.6 mm are summarized below. Values are indicative compounding envelopes; production lots must be verified on the chosen PA12 viscosity grade.
| FR system | Loading range | UL 94 at 1.6 mm | LOI ISO 4589-2 | CTI IEC 60112 | Charpy notched ISO 179/1eA |
|---|---|---|---|---|---|
| Aluminium diethylphosphinate | 15–20 wt% | V-0 | 35–42% O₂ | >600 V | 6–9 kJ/m² |
| Melamine polyphosphate | 25–30 wt% | V-2 | 28–33% O₂ | >600 V | 5–8 kJ/m² |
| Microencapsulated red phosphorus | 7–12 wt% | V-0 | 32–36% O₂ | 550–650 V | 7–10 kJ/m² |
| Brominated epoxy/Sb₂O₃ | 20–26 wt% | V-0 | 30–34% O₂ | 300–450 V | 4–6 kJ/m² |
For automotive fuel vapor recovery tubing, the flame-retardant function is usually placed in the outer jacket of a multi-layer construction. An outer PA12 compound containing 8–12 wt% microencapsulated red phosphorus meets UL 94 V-2 at 0.8 mm and does not control total fuel permeation when a separate EVOH barrier layer is co-extruded. Multi-layer co-extrusion runs with outer-layer melt temperature 225–240 °C, die gap 0.8–1.2 mm, and line speed adjusted to maintain outer-layer wall thickness 0.2–0.3 mm. The red phosphorus package is microencapsulated because unencapsulated grades release phosphine if melt temperature exceeds 250 °C; barrel over-temperature interlocks are set 5 °C above the outer-layer setpoint. Quick connectors are injection moulded from the same compound according to SAE J2044. Pre-molding moisture must remain below 0.10 %; higher moisture reduces pull-off retention by lowering weld-line strength and raises the risk of splay. Gate sizing at 1.2 mm with a short cold slug well prevents premature freeze-off and limits regrind-induced black specks. These components are qualified under SAE J2260 on finished tube assemblies; the FR package is not a substitute for EVOH barrier performance. End-use parts include vapor-recovery quick connectors and underbody fuel-vapor line outer jackets.
Rail transit cable ducts and cable clamps produced from low-smoke FR PA12 are compounded on a co-rotating twin-screw extruder with 40:1 L/D and atmospheric venting. A flame-retardant package combining melamine polyphosphate and aluminium diethylphosphinate at total 20–25 wt% yields EN 45545-2 hazard level HL2 in 2.0 mm extruded wall sections for R22/R23 interior components. Smoke density per ISO 5659-2 at 50 kW/m² without pilot flame remains below 200 at 240 s for production samples; actual values are compound-specific. Melt strength must be high enough for slotted cable duct profiles with 0.8 mm internal webs; die temperatures above 235 °C cause web sag. Low-molecular-weight processing aids are excluded because they raise smoke density. Molded clamp jaws require ISO 178 flexural modulus above 2,100 MPa and ISO 179/1eA Charpy notched impact above 5 kJ/m² at 23 °C. The flame-retardant package is incompatible with zinc stearate; zinc stearate interferes with phosphinate char formation and reduces the UL 94 V-0 margin. End-use parts include cable clamps and slotted conduits in rail vehicles where halogen-free combustion gas requirements exclude brominated formulations.
Injection-moulded busbar insulators and low-voltage connector bodies use a 25 wt% glass-fibre reinforced PA12 FR compound. The flame-retardant system is aluminium diethylphosphinate at 12–15 wt% because brominated/Sb₂O₃ packages in PA12-glass compounds typically reduce CTI to 300–450 V under IEC 60112, which is insufficient for IEC 60664-1 pollution degree 2 spacing. The halogen-free compound achieves UL 94 V-0 at 0.75 mm, CTI above 600 V, and glow-wire ignition temperature above 775 °C per IEC 60695-2-13. Injection molding requires mould temperatures of 90–110 °C to reduce glass-fibre surface blooming and stabilise electrical tracking. Melt temperature must not exceed 250 °C; dwell time at 250 °C should remain below 8 min because phosphinate degradation generates volatile phosphorus species that corrode tool vents. Typical injection pressure is 80–120 MPa with screw backpressure 5–10 MPa. Clamp force is calculated from projected area at 80 MPa packing pressure, not from machine default settings. End-use parts include 48 V battery busbar support frames and connector housings with snap fits. The operational boundary is that wall sections below 0.4 mm may drop to V-2 because of insufficient char formation.
Selective laser sintering of flame-retardant PA12 powder for aircraft cabin interior brackets is executed on a bed temperature of 168–172 °C and laser power 55–65 W. The base powder is a PA12 with organophosphinate FR filler, sieved to 20–80 µm; Hausner ratio is maintained below 1.3 to ensure recoater uniformity. Virgin powder refresh rate is 40–50 % per build because recycled powder loses FR activity and shows an increase in melt-flow rate due to polyamide chain scission. Specimens printed in the z-axis at 0.12 mm layer thickness meet UL 94 V-0 at 1.0 mm and 14 CFR 25.853(a) 60-second vertical burn after vapour smoothing. Smoke density per ASTM E662 is reported on printed flat plaques, not loose powder. Mechanical properties are anisotropic; tensile strength measured to ISO 527-2 Type 1A in the build-plane direction is generally 35–45 MPa and elongation at break 8–12 %, while z-axis values are 20–30 % lower. Published data for this specific configuration is limited; aircraft qualification requires a full cabin interior test campaign on the final printed part geometry. End-use parts include air-duct brackets and low-load cable standoffs.
In automated plant floor installations, flame-retardant PA12 pneumatic tubing is extruded at wall thickness 1.5–2.0 mm with a melt temperature of 225–235 °C. An aluminium diethylphosphinate loading of 10–14 wt% gives UL 94 V-0 at 2.0 mm while retaining sufficient flexibility for robotic dress-pack bending. Push-in fittings assembled from the same compound are evaluated under ISO 14743 for leakage at 10 bar and for retention on 8 mm OD tubing. Injection-moulded fittings require pre-drying at 80 °C for 5 h when ambient relative humidity exceeds 60 %; failure to pre-dry results in splay and weld-line embrittlement. The flame-retardant package should not be combined with amine-based additives because amine terminals can accelerate phosphinate decomposition. Abrasion resistance is qualified by end-use routing trials rather than a universal standard because cable jacket and pneumatic tube bundles are application-specific. End products include polyamide robot dress-pack conduits, pneumatic supply tubes, and cable protection jackets used in automotive welding cells and packaging lines.
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Flame-retardant polyamide 12 (PA12-FR) is a semicrystalline thermoplastic derived from laurolactam or ω-aminolauric acid, modified with halogenated or halogen-free additive systems to meet ignition-resistance requirements under ANSI/UL 94, IEC 60695-11-10, and IEC 60695-2-12/-13 glow-wire protocols. The PA12 backbone provides a melting peak near 175–180 °C by ISO 11357-3, saturated water absorption of approximately 0.8–1.2% under ISO 62, and lower density than PA66 or PBT at equivalent flame-retardant loading. Commercial injection-molding grades are specified with melt volume-flow rate from 5 cm³/10 min to 30 cm³/10 min at 235 °C/2.16 kg per ISO 1133-1:2022, and must be dried to residual moisture below 0.1% before melt processing. Representative designations under ISO 1043-1 include PA12-FR, PA12-GF20-FR, PA12-MD25-FR, and PA12-GF25-FR-HF, where HF denotes a halogen-free composition. Halogen-free grades are generally formulated to comply with RoHS Directive 2011/65/EU and with electronics-industry halogen thresholds of <900 ppm Cl, <900 ppm Br, and <1500 ppm total halogens; halogenated grades may still be specified where thin-wall V-0 performance is critical and controlled incineration is available.
Two additive mechanisms dominate PA12-FR. The first uses brominated aryl compounds with antimony trioxide as a gas-phase radical-chain terminator; total flame-retardant loading typically falls between 12 wt% and 20 wt%. During combustion, hydrogen bromide and antimony trihalide species interrupt the oxidation chain. The second uses metal phosphinates, frequently aluminium diethylphosphinate combined with melamine polyphosphate or zinc borate, at loadings typically from 15 wt% to 25 wt%. This halogen-free system acts mainly in the condensed phase, promoting intumescent char and reducing heat release. The electrical-tracking consequence is measurable: halogen-free PA12-FR often exhibits comparative tracking index from 550 V to 600 V under IEC 60112, while brominated grades commonly fall between 400 V and 550 V. In vertical burn testing, halogenated PA12-FR can reliably meet UL 94 V-0 at 0.8 mm and sometimes below; halogen-free grades generally sustain V-0 at 1.6 mm and 3.0 mm, but V-0 at 0.4 mm is uncommon, and published data for this specific configuration is limited. Notched Charpy impact under ISO 179-1/1eA at 23 °C is commonly 4–9 kJ/m² for unreinforced halogen-free PA12-FR and 4–8 kJ/m² for brominated PA12-FR. At −30 °C, values may fall below 3 kJ/m², making the ductile-to-brittle transition a design boundary for clips and snap-fits. Limiting oxygen index under ISO 4589-2 typically ranges from 28% O₂ to 35% O₂ for V-0-grade compounds.
| Property | Test method | Halogenated PA12-FR | Halogen-free PA12-FR |
|---|---|---|---|
| Density | ISO 1183-1 | 1.09–1.18 g/cm³ | 1.06–1.16 g/cm³ |
| Tensile stress at yield | ISO 527-2 | 38–48 MPa | 35–46 MPa |
| Tensile modulus | ISO 527-2 | 1500–2000 MPa | 1400–1900 MPa |
| Charpy notched impact, 23 °C | ISO 179-1/1eA | 4–8 kJ/m² | 5–9 kJ/m² |
| Comparative tracking index | IEC 60112 | 400–550 V | 550–600 V |
| Dielectric strength | IEC 60243-1 | 30–35 kV/mm | 30–34 kV/mm |
| UL 94 at 1.6 mm | ANSI/UL 94 | V-0 | V-0 |
The halogen-free advantage in CTI is relevant for connectors, terminal blocks, and switchgear exposed to conductive dust or condensation, because tracking can initiate at lower voltages in brominated systems. Brominated grades, however, frequently retain higher elongation at break and process with lower melt-viscosity shift at equivalent flame rating. Selection therefore depends on whether the specification prioritizes electrical safety in polluted environments or thin-wall ignition resistance and ease of higher-speed molding.
Compounding of PA12-FR is not a direct extension of neat PA12 processing. On a co-rotating twin-screw extruder with L/D ratio 40, halogen-free phosphinate or melamine polyphosphate systems are often side-fed after the primary melt seal to limit thermal exposure. Melt temperature is maintained at 210–230 °C, while feed zones are set to 180–200 °C. Residence time above 230 °C should not exceed 10 min because organophosphinate and brominated systems can release acidic volatiles and reduce flame-retardant efficiency. Vacuum venting above −0.85 bar relative is necessary to prevent pellet porosity; production-scale compounding has shown vent plugging when vacuum falls below −0.6 bar in melamine polyphosphate-containing formulations. For injection molding, barrel temperatures of 205–230 °C, mold temperatures of 60–80 °C, and hydraulic back pressures of 3–7 MPa are typical. Weld-line strength is especially sensitive to mold temperature; mold surface temperatures below 40 °C can reduce notched Charpy impact at knit lines by more than 50%. Gas-counterpressure or vacuum venting may be required in long-flow tools to avoid gas burn marks from flame-retardant decomposition products. Regrind content is usually limited to 20–30 wt%; with halogenated grades, contamination by PA66 or polyester must be excluded because mixed polymer domains destabilize the UL 94 classification.
Pre-drying is mandatory at 80 °C for 4–8 h in a desiccant dryer with a dew point below −30 °C. In ambient relative humidity above 60% RH, open pellet exposure beyond 20 min can raise moisture above 0.15%, producing surface splay and loss of flame rating. Machine hopper dryers should be used when ambient dew point exceeds 10 °C. Halogenated PA12-FR can generate corrosive trace gases; plastication units should therefore use corrosion-resistant screw and barrel alloys or high-chromium coatings. Mineral and glass-reinforced FR grades accelerate abrasive wear, so bimetallic barrels and hard-surfaced screw elements are specified in continuous production.
Reinforcement changes the burning classification. At 20 wt% glass fiber, PA12-FR tensile modulus rises to 3500–4500 MPa, but glass wicking and reduced char quality can lower UL 94 performance from V-0 to V-2 at thin walls if flame-retardant loading is not increased by 3–5 wt% or if zinc borate is not added as a synergist. Mineral-filled grades at 25 wt% improve flatness and lower warpage but reduce notched impact to 3–5 kJ/m² and raise density to 1.25–1.35 g/cm³. Carbon-fiber-reinforced PA12-FR is uncommon because conductive carbon can reduce CTI and requires grounding; when used, it is typically for structural housings where electrostatic dissipation is an additional requirement.
PA12-FR is selected over PA66-FR where moisture absorption creates assembly tolerances, connector backfill stress, or dielectric drift. Under ISO 62, saturated water uptake of neat PA12 is approximately 0.8–1.2%, compared with 7–9% for PA66. A PA12-FR connector equilibrated at 23 °C/50% RH may reach below 0.7% moisture, while a PA66-FR connector may reach 2.5–3.0%. The result is less dimensional growth, less hydrolysis risk, and better retention of surface resistivity under humid service. Compared with PBT-FR, PA12-FR has lower density, better resistance to hot automotive oils, zinc chloride road salt, and methanol-containing fuel, but lower heat deflection temperature under 1.8 MPa by ISO 75-2. Unreinforced PA12-FR HDT/A commonly remains 55–70 °C, below general PBT-FR values of 60–80 °C and below glass-reinforced PA66-FR values of 90–120 °C. Continuous service above 80–100 °C under mechanical load is therefore outside the usual PA12-FR boundary. At low temperature, however, PA12-FR retains higher impact resistance down to −40 °C than many PBT-FR formulations, which is relevant for cable ties and enclosures in refrigeration or outdoor climates.
| Property | Test method | PA12-FR | PA66-FR | PBT-FR |
|---|---|---|---|---|
| Density | ISO 1183-1 | 1.06–1.18 g/cm³ | 1.15–1.45 g/cm³ | 1.30–1.60 g/cm³ |
| Saturated water absorption | ISO 62 | 0.8–1.2% | 7–9% | 0.2–0.4% |
| Melting peak | ISO 11357-3 | 175–180 °C | 255–262 °C | 220–225 °C |
| UL 94 at 1.6 mm | ANSI/UL 94 | V-0 | V-0 | V-0 |
| Comparative tracking index | IEC 60112 | 400–600 V | 300–550 V | 250–600 V |
The values in the comparative table are generalized from publicly reported commercial datasheets; specific results vary with filler type, flame-retardant chemistry, and wall thickness. PA12-FR occupies a position between PA66-FR and PBT-FR in high-temperature stiffness but is distinguished by low moisture uptake, low density, and chemical resistance to non-polar fluids.
Typical end uses include electrical connectors, low-voltage switchgear, cable ties, battery-management components, and interior rail or aviation parts requiring low smoke density. In electrical connectors, PA12-FR is injection-molded on presses with clamp force from 35 t to 120 t, using hot-runner systems with gate diameters of at least 0.8 mm to prevent excessive shear heating. Circuit-breaker housings requiring UL 94 V-0 at 1.6 mm and glow-wire ignitability below 850 °C per IEC 60695-2-13 are within scope when service temperature remains below 80 °C. In cable ties and wire management, halogen-free PA12-FR reduces smoke toxicity, but the lower modulus of unreinforced grades may require increased section thickness relative to PA66. For battery component carriers, electrolyte-splash resistance and low-temperature ductility are selection drivers; however, direct contact with concentrated mineral acids or chlorinated solvents is not recommended, and continuous ethylene glycol exposure above 90 °C can hydrolyze the amide backbone over time. Certification testing must be repeated after moisture conditioning because water absorption changes dielectric properties and ignition resistance; dry-as-molded specimens may overstate UL 94 performance relative to parts equilibrated at 23 °C/50% RH. Smoke-density assessments under ISO 5659-2 and cone calorimeter heat-release data under ISO 5660-1 are commonly required for mass-transport interiors, and formulations must be re-qualified when color concentrates or laser-marking additives exceed 1–2 wt% because such additions can alter char formation.
