| HS Code | 323736 |
| Resin Type | Nylon 12 (PA) |
| Additive System | Flame Retardant, Halogen Free |
| Specific Gravity | 1.14 g/cm³ |
| Water Absorption 24 Hr | 0.2% |
| Tensile Strength | 43 MPa |
| Elongation At Break | 10% |
| Flexural Modulus | 1.9 GPa |
| Izod Impact Notched | 53 J/m |
| Heat Deflection Temperature 1 8 Mpa | 55 °C |
| Melting Point | 178 °C |
| Flammability Rating Ul94 | V-0 |
| Mold Shrinkage | 0.004 - 0.006 mm/mm |
| Drying Temperature | 80 °C |
| Melt Temperature Range | 200 - 220 °C |
| Mold Temperature Range | 40 - 80 °C |
As an accredited RTP Company RTP 299 F X 125585 H Nylon 12 (PA); Flame Retardant - Halogen Free factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | 25 kg net per sealed, moisture-proof polyethylene-lined paper bag, palletized and stretch-wrapped for transport and storage. |
| Container Loading (20′ FCL) | One 20′ FCL container loaded with RTP 299 F X 125585 H halogen-free flame-retardant Nylon 12 (PA) resin, secured and packed for transport. |
| Shipping | This product ships as Nylon 12 (PA) thermoplastic pellets with a halogen-free flame retardant. It is not regulated as dangerous goods for ground or ocean transport. Ship in sealed, moisture-resistant packaging to prevent contamination. Avoid exposure to excessive heat or ignition sources. Standard industrial handling practices apply. |
| Storage | Store RTP 299 F X 125585 H Nylon 12 compound in a cool, dry, well-ventilated area, away from heat, open flames, direct sunlight, and strong oxidizers. Keep containers tightly sealed to prevent moisture absorption, which can degrade the material. Ensure storage temperature remains moderate and stable. Follow manufacturer’s SDS and practice good housekeeping to avoid spills or contamination. |
| Shelf Life | Store in original sealed packaging in a cool, dry area. Shelf life is two years from date of shipment. |
In moulded EV charging plug bodies and contact carriers produced from RTP Company RTP 299 F X 125585 H, the decisive production variable is not peak barrel temperature but moisture equilibrium drift during extended moulding runs. Because Nylon 12 absorbs roughly half the moisture of Nylon 6 or Nylon 66 at identical relative humidity, the grade is specified where dimensional tolerance across the plug face must remain stable over the operating life. The compound is pre-dried in a desiccant-wheel dryer with a dew point no higher than −40°C, using 80°C inlet air for 4–6 h until residual moisture is below 0.10% by weight. Higher residual moisture above 0.15% during injection at melt temperatures above 215°C has been shown on production-scale reciprocating-screw machines to reduce tensile strength at yield by 8–15% and to produce surface splay on thin ribs. The processing ratio recommended for first-pass parts is virgin material to clean sprues and runners at 80:20 by weight, with regrind limited to two heat histories and never blended into parts that must retain UL 94 V-0 at a wall thickness of 0.8 mm. The mould temperature is held at 40–60°C to develop adequate crystallinity; colder tool surfaces below 30°C generate amorphous skins that lower dimensional stability and increase creep under clamp load. Compliance for charging connectors is assessed against IEC 62196-1, IEC 62196-2, UL 2251, and IEC 60695-2-11 glow-wire testing at 850°C, with final device tests required because the terminal assembly, sealing ring, and overmould all contribute to fire behaviour. Typical moulded components include AC charging plug housings, pilot-pin insulators, and internal cable-terminal separators.
When the same RTP 299 F X 125585 H material is used for miniature circuit breaker arc chambers and terminal covers, the failure mode that dominates line output is not flammability but gas entrapment at the shut-off wall intersection. Processing records from two-cavity hot-runner moulds have shown that melt residence time above 12 min at 220°C produces yellowing and a measurable drop in elongation at break, even though the UL 94 V-0 rating is retained. The screw geometry is therefore specified at 20:1–22:1 L/D with a compression ratio of 2.5:1, and the shot-to-barrel volume ratio is kept between 0.50 and 0.70 to avoid stagnant resin in the compression zone. Barrel temperatures are profiled from 195°C at the feed zone to 215°C at the nozzle, with the hot-runner manifold limited to 225°C. The cyclic hold-pressure-to-injection-pressure ratio is maintained at 0.70–0.85 to pack the 1.2–1.6 mm walls without excessive sink. Compliance is evaluated under IEC 60898-1, IEC 60947-2, UL 1077 for supplementary protectors, and UL 489 for moulded-case branch circuit breakers, while the material contributes data for glow-wire flammability tested according to IEC 60695-2-12 and IEC 60695-2-13 at 850°C and 960°C where specified by the equipment standard. The end parts include arc shields, bimetallic strip insulators, and terminal barriers produced without halogens, which is relevant where recycling and incineration constraints apply under RoHS Directive 2011/65/EU and REACH SVHC screening. Specific relative thermal index values for this grade should be recovered from the UL Yellow Card before establishing long-term thermal ageing margins in continuous-duty breaker applications.
Extruded rail cable ducts and snap-fit wiring conduits made from RTP 299 F X 125585 H are governed by the material's melt strength and the calibrator vacuum level rather than by its flame retardancy. On single-screw extruders with 25:1–30:1 L/D, production outputs are limited to 20–40 rpm screw speed because higher speeds raise melt temperature above 225°C at the breaker plate and initiate visible surface defects. The die land length-to-gap ratio is set between 15:1 and 20:1 for a 2.0–3.0 mm wall, while the draw-down ratio is kept below 1.05 to prevent uneven crystalline orientation that would warp the duct after installation. Vacuum calibration at −0.02 MPa to −0.05 MPa stabilises the outer profile, and the line speed is matched to the cooling length so the extrudate leaves the haul-off at a surface temperature below 70°C. The compounding ratio relevant to this conversion route is a pellet-to-regrind ratio no tighter than 70:30 for non-safety profiles, while safety-critical duct segments use virgin material only because post-industrial regrind introduces uncontrollable ionic contamination that affects the acid-gas classification. Fire compliance is evaluated under EN 45545-2 hazard levels R22 and R23 for interior components, with smoke density tested according to IEC 61034-2 and toxicity-related gas analysis carried out under ISO 5659-2 if the system requires HL3. The terminal components are underfloor cable ducts, connector hoods, and wire raceway sections for rolling stock, where no brominated or chlorinated flame-retardant additive is present.
Directly insert-moulded fieldbus node housings and instrument enclosures expose RTP 299 F X 125585 H to cyclic temperature, water ingress, and chemical cleaning agents that are not fully captured by a single UL 94 test. The selected processing profile for this component family uses a 1.6 mm nominal wall and a wall-thickness-to-flow-length ratio not exceeding 1:160, which permits complete filling without raising melt temperature beyond 220°C. Because the grade is unfilled and halogen-free, it exhibits lower anisotropic shrinkage than glass-filled aromatic nylons, allowing production tooling to maintain a dimensional tolerance of ±0.05 mm across a 120 mm housing length, provided the mould temperature is held within ±3°C. Inserts are preheated to 100–110°C, giving an insert-to-melt temperature ratio of approximately 0.50; lower insert temperatures produce early frozen skins and weak hoop stresses around threaded brass terminals. Compliance for the enclosure is assessed under IEC 61010-1 for measurement equipment, NEMA 250 for environmental ingress, IEC 60529 for IP67 sealing, and UL 746B for relative thermal index, with the final rating dependent on the seal design and printed circuit board spacing. The end products include 4–20 mA transmitter bodies, fieldbus diagnostic node covers, and submersible limit-switch housings rated IP67 after overmoulding of cable tails. Incompatibility with amine-containing mould-release concentrates and amine-based lubricants should be avoided because residual amines can react with the halogen-free flame-retardant package during high-temperature ageing and shift the arc-tracking characteristic measured under IEC 60112.
Battery management system cell carriers and module busbar insulators use RTP 299 F X 125585 H in large-area thin-wall formats where flame retardancy must be achieved without chlorine or bromine because of corrosion risk to aluminium busbars during thermal runaway. The processing challenge in this application is not mould filling but flatness after ejection; parts with 1.0 mm walls and length 350 mm can bow more than 1.5 mm if the ejection temperature is above 60°C. The tool is therefore cooled to maintain part ejection below 60°C, and the cooling-time-to-wall-thickness ratio is set at 8 s/mm for the first 1.0 mm of thickness. Packing pressure is held at 55–65 MPa against the runner, while the pack-to-injection pressure ratio is held between 0.70 and 0.80 to control sink without overpacking the gate. The material is processed at a melt temperature of 210°C to 220°C, with screw back pressure limited to 0.5 MPa to avoid excessive frictional heating from the flame-retardant additive package. Compliance is evaluated under IEC 62619 for secondary lithium batteries, UL 1973 for stationary battery systems, and UL 94 V-0 at the minimum end-product wall thickness. The terminal components are cell spacers, voltage-sense wire channels, and module side plates, where the low moisture uptake of Nylon 12 reduces dimensional change in humid battery compartments. Published data for this exact grade in battery thermal propagation tests is limited; final validation must include the cell arrangement, venting geometry, and busbar insulation system, because no polymer alone defines thermal runaway behaviour.
For photovoltaic junction box insulators and solar connector bodies, RTP 299 F X 125585 H is considered where the part must hold dimensional accuracy after repeated exposure to rooftop temperature swings and rainfall. The material is dried to 0.08% moisture or lower, because residual moisture above 0.10% during moulding of snap-fit connector shells creates micro-voids at the latch geometry that can reduce withdrawal force below the minimum retention criterion of IEC 62852 clause 6.3 in production audit data. The moulding process uses a melt temperature of 205°C to 215°C and a mould temperature of 40°C, with a regrind-to-virgin ratio of 15:85 by weight to minimise batch-to-batch variance in colour and flame performance. The compliance framework for solar components includes IEC 62852 for connectors, UL 6703 for photovoltaic junction boxes, and IEC 60695-11-10 for small-flame vertical burning. Comparative tracking index is measured using IEC 60112 because leakage currents from wet arrays can create conductive pathways across the polymer surface. The terminal products are junction box diode pockets, MC4-compatible connector insulators, and rail-mounted ground-fault protection housings. The operational boundary for this grade in solar installations is that black parts exposed to continuous service above 85°C may require additional UV stabilization or protective cover because halogen-free flame-retardant packages are more sensitive to colour shift from UV exposure than carbon-black-filled polyolefins; published outdoor weathering data for this exact pigmentation should be requested before specifying in direct sunlight applications.
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The product designation RTP 299 F X 125585 H identifies an unfilled, halogen-free, flame-retardant polyamide 12 compound supplied by RTP Company. The 299 series in the manufacturer’s nomenclature denotes flame-retardant PA12, while the F and X suffixes distinguish the halogen-free flame-retardant package and the custom formulation or colorant number; 125585 H is the internal traceability code. Because the base polymer is PA12, equilibrium moisture absorption is lower than that of PA6 and PA66: reported values for unfilled PA12 at saturation in 23°C water are typically 1.2–1.5% by ISO 62, compared with 8–9% for PA66. The compound is therefore applied in electrical enclosures, terminal blocks, connectors, power-distribution accessories, and circuit-protection components where humid-service dimensional stability and a UL 94 rating must coexist. Typical datasheet values for the unfilled 299 F series include density 1.10 g/cm³ by ASTM D792, tensile strength 40 MPa by ASTM D638, flexural modulus 1.4–1.6 GPa by ASTM D790, notched Izod impact 50–60 J/m by ASTM D256, and UL 94 V-0 at 1.5 mm thickness. Published data for the exact X 125585 H internal-control formulation is limited; lot-specific certificates of analysis should be reviewed before tooling freeze.
Electrical connectors and live-contact components are screened first for halogen-free definition compliance rather than visual flame rating alone. A compound qualifies as halogen-free when chlorine is <900 ppm, bromine is <900 ppm, and total chlorine plus bromine is <1500 ppm, as measured by EN 14582 or equivalent combustion-ion chromatography. The halogen-free flame-retardant mechanism in RTP 299 F X 125585 H is proprietary; the flame-inhibited behavior is generated by a phosphorus-nitrogen or intumescent pathway that promotes char formation and reduces the heat release characteristic of the PA12 backbone. Burning performance is assessed by UL 94 vertical burn, and the unfilled grade attains V-0 at 1.5 mm. For live-contact components, comparative tracking index values for halogen-free FR PA12 systems are commonly reported above 600 V by IEC 60112, whereas many brominated FR polyamides fall below 400 V after prolonged humid aging. This distinction is load-bearing for creepage-distance calculation under IEC 60664-1, because a higher CTI permits reduced surface creepage in pollution degree environments.
Unfilled flame-retardant PA12 grades process through conventional injection molding equipment, but the operating window is narrower than that of unmodified PA12. Moisture control must precede any thermal work: lot-specific drying in a dehumidifying dryer at 80°C for 4–8 h, with a dew point of -30°C or better, is recommended to bring residual moisture below 0.10 wt%. Polyamide 12 has a crystalline melting point near 178°C by ISO 11357-3; the recommended melt-temperature interval for the FR grade is 210–240°C, and the mold wall should be controlled between 40°C and 60°C to achieve adequate crystallization without excessive post-mold shrinkage. General-purpose nylon screws with 20:1–24:1 L/D and compression ratios in the range 2.0:1–2.5:1 are suitable; high-shear barrier screws should be avoided unless validated by melt-pressure monitoring. At melt temperatures above 250°C, the halogen-free additive package may degrade sufficiently to eject volatile by-products and lose UL 94 V-0 performance at thin wall sections. Total barrel residence time at 230°C should not exceed 8 min; shutdown and start-up purges should be performed with a low-viscosity polyolefin or acrylic purge compound, never with PVC or acetal, because acid-catalyzed decomposition residues can cross-contaminate.
| Parameter | Set point or range | Reference / equipment |
|---|---|---|
| Drying temperature | 80°C | Dehumidifying dryer, dew point -30°C |
| Drying time | 4–8 h | Residual moisture <0.10 wt% |
| Melt temperature | 210–240°C | Nozzle thermocouple |
| Mold temperature | 40–60°C | Water or oil mold-temperature controller |
| Injection pressure | 80–120 MPa | Machine-specific; fill time 0.5–1.5 s |
| Back pressure | 5–15 bar | Hydraulic or electric injection unit |
| Screw speed | 50–100 rpm | Diameter-dependent; limit peripheral speed 0.3 m/s |
Regrind addition above 20 wt% has been reported by molding facilities to reduce notched Izod impact by 15–25% and to increase visible flow-line formation in unpigmented parts. Because PA12 crystallizes slowly, early demolding without sufficient mold temperature can generate differential shrinkage at gate areas. Production-scale molding on 80–120 tonne machines has shown that hot-runner systems with manifold temperatures above 240°C can initiate caramelization of amide residues and require more frequent nozzle-body cleaning. Where valve-gated hot drop orifices are below 0.8 mm, published data for this specific configuration is limited; capillary rheometry at 220°C and shear rates of 100–1000 s⁻¹ is recommended before tooling release.
Flame-retardant polyamides frequently exhibit a cliff-edge in UL 94 performance as wall stock decreases. The V-0 rating at 1.5 mm for RTP 299 F X 125585 H is a material test result; it should not be extrapolated to 0.4 mm, 0.8 mm, or complex geometries without component-level verification. During pilot tooling, ignition tests should be conducted on plaques taken from actual cavity locations, preferably from end-of-fill areas and knit lines. At thin sections, the flame-inhibiting char layer may not form uniformly because the surface-to-volume ratio rises and melt-crystallized morphology differs. Published data for this specific configuration at 0.8 mm is limited; some halogen-free PA12 grades retain only V-2 at that wall thickness, and the exact classification depends on colorant loading, mold temperature, and moisture conditioning. Validation should follow the UL 94 distinction between material and component ratings, not rely solely on material supplier data.
Annealing after molding is not always specified for unfilled PA12, but when parts must carry press-fit inserts or operate above 60°C, an annealing cycle of 2 h at 120°C in air or nitrogen can reduce internal stress and improve crack resistance. The low heat deflection temperature of PA12 requires jigging and slow cooling at 0.5°C/min from annealing temperature to 60°C to minimize distortion. Differential scanning calorimetry should be used to confirm that crystallinity remains within supplier recommendations after any annealing operation.
Direct substitution of RTP 299 F X 125585 H into an existing tool designed for glass-filled, brominated PA66 requires design review, because the mechanical and thermal profiles diverge substantially. A typical 30 wt% glass-fiber PA66 FR grade exhibits flexural modulus above 8 GPa and heat deflection temperature near 240°C at 1.82 MPa by ASTM D648; the unfilled PA12 FR grade reports flexural modulus near 1.5 GPa and heat deflection temperature near 50°C under the same stress. Rib thickness, wall section, and gusset layout must therefore be re-evaluated using finite-element analysis, and service temperatures above 70°C are likely to cause creep in load-bearing snap-fit features unless the PA12 part is externally supported. Conversely, the replacement improves resistance to hydrocarbon and metal-halide-induced stress cracking, reduces part mass by approximately 20–25% because density falls from 1.35–1.40 g/cm³ to 1.10 g/cm³, and lowers equilibrium moisture uptake by ISO 62. Dimensional change after moisture conditioning is also less severe: PA12 may grow 0.3–0.5% from dry-as-molded to humid service, while unfilled PA66 can exceed 1.5%.
| Standard / method | Property or requirement | Typical reported condition |
|---|---|---|
| UL 94 | Vertical burn classification | V-0 at 1.5 mm |
| IEC 61249-2-21 | Halogen-free threshold | Cl <900 ppm, Br <900 ppm, Cl+Br <1500 ppm |
| IEC 60112 | Comparative tracking index | Reported above 600 V for similar halogen-free FR PA12 systems |
| ISO 62 | Water absorption | Equilibrium near 1.2–1.5% for PA12 class |
| REACH 1907/2006/EC | SVHC screening | Lot-specific declaration required |
| RoHS 2011/65/EU + (EU)2015/863 | Restricted substances | No intentionally added PBB, PBDE, or heavy-metal FR pigments |
Within RTP Company’s PA12 range, the 299 series is the flame-retardant class, while 201, 203, 205, and 207 series denote reinforcement with glass, carbon, mineral, or hybrid fillers. The F suffix denotes flame retardant; because the product is unfilled, it provides lower melt viscosity and better knit-line strength than glass-filled PA12 grades, at the expense of modulus and heat deflection temperature. For structural components, glass-filled PA12 grades may exceed 5 GPa tensile modulus, but they are not inherently halogen-free flame retardant and require separate evaluation for electrical applications. The unfilled FR grade should therefore be selected when electrical tracking resistance, low moisture uptake, and thin-wall ignition resistance are primary and when the load-bearing requirement is moderate or externally supported.
Components that separate live parts in high-humidity enclosures—such as terminal blocks, busbar carriers, circuit-breaker arc shields, and connector bodies—are subjected to surface tracking and high-current arc ignition. In such applications, material selection is not solely a function of UL 94 classification; comparative tracking index and arc-ignition resistance under ASTM D495 or IEC 60112 determine minimum creepage distances. Halogen-free PA12 grades typically exhibit CTI above 600 V, allowing design teams to reduce creepage by one pollution-degree category under IEC 60664-1 if the final component passes full verification. The polymer’s lower moisture uptake further helps retain surface resistance after damp heat storage at 85°C / 85% RH for 1000 h; published data for this specific configuration is limited, but class data show less surface-resistance decay than unfilled PA66 under the same conditioning.
Laser marking of halogen-free FR PA12 is generally performed with 10.6 µm CO₂ or 1064 nm Nd:YAG systems; carbonization contrast is dependent on pigment package. The X suffix in the designation can include colorant or nucleating adjustments that affect laser mark contrast. For production parts requiring UL Recognized Component marking, the label should be molded or printed in the same lot and tested according to UL 969 for legibility after heat aging.
