| HS Code | 450426 |
| Density | 1.03 g/cm³ |
| Melting Point | 178 °C |
| Glass Transition Temperature | -40 °C |
| Heat Deflection Temperature 1 8 Mpa | 50 °C |
| Heat Deflection Temperature 0 45 Mpa | 90 °C |
| Tensile Modulus | 1450 MPa |
| Tensile Stress At Break | 48 MPa |
| Tensile Strain At Break | >50 % |
| Charpy Impact Strength 23 C Unnotched | No break |
| Charpy Notched Impact Strength 23 C | 45 kJ/m² |
| Charpy Notched Impact Strength 30 C | 15 kJ/m² |
| Water Absorption 24h 23 C | 0.3 % |
As an accredited EMS-Grivory Grilamid XE 3841 nat Nylon 12, Impact Modified, Dry factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | 25 kg sealed moisture-proof polyethylene bag, labeled with product name, batch number, and handling precautions for dry nylon 12 pellets. |
| Container Loading (20′ FCL) | One 20-foot full container load (FCL) of EMS-Grivory Grilamid XE 3841 nat Nylon 12, impact modified, dry, in suitable packaging. |
| Shipping | Ship as dry, sealed moisture-barrier bags or drums to prevent moisture uptake. Store in a cool, dry area, away from heat and direct sunlight. Non-hazardous per regulations, but avoid dust creation. Standard freight handling applies. Keep containers sealed until use, and ensure proper labeling for polymer resin transport. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep the original sealed container to prevent moisture absorption, as Nylon 12 is hygroscopic. Maintain temperatures below 30°C and ambient humidity below 50%. Use within 12 months of receipt to ensure optimal performance. |
| Shelf Life | Store sealed in cool, dry conditions to prevent moisture absorption. Typical shelf life is two years from date of manufacture. |
Moisture ingress above 0.15% by weight is the primary extrusion defect trigger for EMS-Grivory Grilamid XE 3841 nat in heavy-duty pneumatic tubing. The dry-as-supplied condition, with moisture content held at or below 0.10% by weight, enters a single-screw extruder configured with a grooved feed section and L/D 30:1 barrier screw. Barrel zone set points are 200 °C, 210 °C, 220 °C, 230 °C, and 235 °C at the die, with melt temperature measured between 225 °C and 240 °C. A spiral mandrel die with 1.0–1.5 mm annular gap feeds a vacuum calibration tank; haul-off speed is trimmed to maintain wall thickness tolerance of ±0.05 mm over a 10 mm to 16 mm outer diameter range. The finished tubing enters commercial-vehicle air suspension, trailer braking circuits, and rail door actuator pilots. Burst pressure and cold-flex testing follow SAE J844 and ISO 7628; because impact modification shifts the ductile-to-brittle transition, finished-tube validation is performed at both 23 °C and −40 °C on production-extruded samples, not on plaques. For UV-stabilized black constructions, a PA12-carrier carbon black masterbatch is added at 2–4 wt% through a static mixer; loading above 5 wt% reduces Charpy notched impact measured to ISO 179/1eA. Re-drying after storage above 60% RH requires 80 °C for 4–6 h with a −30 °C dew-point air supply. Melt residence times beyond 8 min should be avoided because prolonged barrel heat exposure leads to depolymerization odour and weld-line embrittlement.
On corrugator lines producing slit-free cable conduit from XE 3841 nat, the crosshead die feeds a vacuum corrugator with block temperatures between 60 °C and 80 °C; corrugator vacuum levels are held at 0.06–0.08 MPa below atmospheric to force the melt against the mould blocks during forming. Line speeds for inner diameters 15 mm to 40 mm range from 5 m/min to 25 m/min. The product is specified for cable management in railway rolling stock, agricultural tractors, and off-road machinery where coiled nylon conduit must absorb stone impact without splitting. Finished conduit is tested according to EN 61386-1:2008 and EN 61386-23:2011; compression, impact, and bending performance are determined on conditioned specimens. Flammability is the main boundary: natural unreinforced PA12 without halogenated flame retardants typically reaches only UL 94 HB at 3.0 mm and shows an oxygen index of approximately 20–22% under ISO 4589-2; therefore, cabin interiors requiring EN 45545-2 HL2 or HL3 cannot use this compound without an aggressive halogen-free flame-retardant masterbatch that will, in turn, lower low-temperature impact and increase spiral wall thickness. Regrind rates in corrugated conduit production should remain below 25 wt%; post-industrial regrind absorbs moisture more rapidly due to increased surface area and must be re-dried before reintroduction.
| Processing parameter | Extrusion (tubing/conduit) | Injection moulding (fittings, clips, shells) |
|---|---|---|
| Drying condition | 80 °C, 4–6 h | 80 °C, 4–6 h |
| Maximum moisture | ≤0.10% by wt | ≤0.10% by wt |
| Melt temperature | 225–240 °C | 240–260 °C |
| Screw L/D | 24:1–30:1 | 20:1–24:1 |
| Compression ratio | 2.5:1–3.0:1 | 2.0:1–2.5:1 |
| Tool/mould temperature | corrugator blocks 60–80 °C | mould 60–90 °C |
| Residence time | ≤8 min | ≤6 min |
Quick-connect fittings for evaporative-emission vapor lines are injection moulded on machines with clamp force between 800 kN and 1500 kN for 8-cavity connector tools. XE 3841 nat is processed at nozzle temperatures of 245–260 °C and mould temperatures of 70–90 °C to balance crystallinity and weld-line strength in thin sealing ribs. Hygienic handling of dry resin is required: ambient exposure above 50% RH for more than 2–3 h can raise surface moisture to a level that produces gas streaks at the gate. The compound’s impact-modifier phase slows shear heating; therefore, screw speed is set at 60–120 rpm for a 40 mm diameter screw and back pressure at 5–10 bar hydraulic. Fill analysis places knit lines away from O-ring seal grooves and snap-fit retention fingers, because impact-modified nylon exhibits lower tensile strength at knit lines than in unidirectional flow. The resulting connectors serve evaporative-emission vapor lines and low-pressure coolant circuits. End-item qualification follows SAE J2044 for fluid-system quick connectors, with tensile pull-off force, 1000 h heat ageing at 100 °C per ISO 188, and exposure testing according to the vehicle platform’s evaporative emission limit under CARB LEV III or EPA 40 CFR Part 86. The material’s low saturated water absorption relative to PA6 keeps dimensional growth below 1.5% by mass under ISO 62 saturation, reducing seal interface drift in underhood systems.
When mould temperatures fall below 60 °C during ski boot shell production, the notched impact retention of XE 3841 nat at −30 °C becomes the primary quality risk. Ski touring boot shells and snowboard binding highbacks are moulded at wall thicknesses of 2–4 mm with holding pressures of 500–800 bar hydraulic to avoid sink marks over rib bases. Specimens die-cut from moulded shells and tested to ISO 179/1eA at −30 °C are used as lot-release indicators; acceptance floors are defined in the brand specification because the elastomeric impact modifier in PA12 exhibits a sharp failure transition when mould temperatures fall below 60 °C, producing large spherulites near the cold mould skin. To maintain consistent crystalline morphology, cooling time for a 3 mm wall is held between 25 s and 40 s. Overmoulding with TPU soft-touch components is possible if the PA12 substrate is preheated to 100 °C to promote surface interaction, though peel strength must be verified on the specific TPU grade. Consumer-goods compliance is limited to REACH Regulation (EC) No 1907/2006 Annex XVII restricted substances and RoHS Directive 2011/65/EU for electronic components; the natural grade does not provide UV inhibition and requires opaque colour masterbatch for sustained outdoor exposure.
Cable ties, fir-tree clips, and reusable fastener heads are injection moulded in high-cavitation tools with cold runners; XE 3841 nat fills small rib sections without jetting because the compound retains a broad processing window when dry. Gate diameter for a 2.5 mm cable-tie head is held at 0.8–1.2 mm; larger gates increase stringing during hot-tip cycles, while smaller gates elevate shear and can break the impact-modifier domain. Mould temperature is set at 70–85 °C. The resulting fasteners are validated against UL 62275 for cable ties, including tensile extraction and loop tension retention after 48 h at 85 °C. Flammability is not a universal requirement for underhood wiring clips, but when UL 94 V-2 is specified, a halogen-free or halogenated flame-retardant package must be compounded in; this typically reduces elongation at break below 100% per ISO 527-2 and shifts the ductile-to-brittle temperature upward. Unmodified XE 3841 nat should be listed only as UL 94 HB at the tested thickness. Reusable locking mechanisms benefit from the material’s low moisture uptake, which limits dimensional swing in humid engine compartments compared with PA6 or PA66.
In low-pressure chemical transfer hose for agricultural sprayers and industrial dosing lines, XE 3841 nat is extruded as an inner core through a crosshead die over a rigid mandrel, then over-braided with polyester or steel wire and covered with a weatherable TPU or EPDM sheath. Melt temperature for the core is kept at 230–245 °C; mandrel temperature 20–30 °C prevents inner-wall collapse during high-ply braiding. The compound is selected for its resistance to aliphatic hydrocarbons, diesel, hydraulic oils, and many crop-protection carriers; chemical compatibility is confirmed by ISO 175:2010 immersion testing on finished hose sections, with weight change and Shore D hardness change ISO 868 limited by the hose specification. Hydrostatic pressure resistance is validated to ISO 1402:2009, while flex impulse testing follows the application-specific ISO 6802 or end-user protocol. The nylon 12 liner is not a universal chemical barrier: continuous contact with concentrated phenols, cresols, formic acid, or concentrated hydrochloric acid at elevated temperature will attack the amide linkages; service limits must be established through chemical resistance tables from EMS and confirmed by long-term immersion. Because the hose core is produced from a dry-fed resin, residual moisture above 0.12% at the breaker plate is rejected as micro-voids in the liner that later become permeation pinholes under flex fatigue.
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EMS-Grivory Grilamid XE 3841 nat Nylon 12, Impact Modified, Dry is supplied as a natural-coloured, impact-modified polyamide 12 compound. The “nat” suffix denotes natural pigmentation. The “Dry” designation refers to the dry-as-moulded conditioning state used for mechanical data, not to the residual moisture content of the shipment. The PA12 backbone provides lower moisture uptake than PA6 or PA66, and the impact-modification package shifts the notched Charpy response at 23 °C to no break under ISO 179-1/1eA. These characteristics place the grade among PA12 materials specified for thin-wall technical parts that require low-temperature impact toughness and reduced hygroscopic dimensional change in humid service.
The following typical values are compiled from supplier technical literature for the dry-as-moulded state. They should not be read as guaranteed specification limits. Lot-to-lot variation should be assessed under incoming inspection procedures such as ISO 9001, with melt volume rate and moisture content as first-line control parameters.
| Property | Standard | Dry value |
|---|---|---|
| Density | ISO 1183-1 | 1.01 g/cm³ |
| Water absorption after 24 h at 23 °C | ISO 62 | 0.7% |
| Melt volume rate at 275 °C / 5 kg | ISO 1133-1 | 8 cm³/10 min |
| Tensile modulus, dry | ISO 527-1/2 | 1200 MPa |
| Yield stress, dry | ISO 527-1/2 | 36 MPa |
| Yield strain, dry | ISO 527-1/2 | 8% |
| Nominal strain at break, dry | ISO 527-1/2 | >50% |
| Charpy notched impact at 23 °C | ISO 179-1/1eA | no break |
| Charpy notched impact at -30 °C | ISO 179-1/1eA | 8 kJ/m² |
| Ball indentation hardness | ISO 2039-1 | 60 MPa |
| Heat deflection temperature HDT/B at 0.45 MPa | ISO 75-2 | 105 °C |
| Vicat softening temperature VST/A/50 | ISO 306 | 140 °C |
| Melting point DSC | ISO 11357-1/-3 | 176 °C |
| Mould shrinkage, injection moulding | ISO 294-4 | 0.5–0.9% |
Conditioning at 23 °C and 50% relative humidity will reduce tensile modulus and yield stress by approximately 10–20%, while elongation at break increases. Published data for this specific configuration under long-term hydrolytic ageing is limited.
Relative to unmodified PA12 injection-moulding grades, the impact-modification package in XE 3841 nat reduces dry tensile modulus and hardness while raising notched impact energy. The dry tensile modulus of 1200 MPa under ISO 527-1/2 is approximately 15–30% below typical unmodified PA12 extrusion grades, which are reported in the range of 1400–1600 MPa depending on viscosity and specimen thickness. The yield stress of 36 MPa and yield strain of 8% indicate a more flexible response than glass-fibre-reinforced PA12 compounds, which may exceed 3000 MPa in tensile modulus but fail at nominal strain below 3%. Hardness is similarly lowered: ball indentation hardness is 60 MPa under ISO 2039-1, placing the material below standard PA12 but above most thermoplastic elastomers.
The practical consequence is that XE 3841 nat should be selected only when the part design permits lower load-bearing stiffness. Snap-fit geometries that require high bending strain and resistance to stress whitening can benefit from the reduced modulus and higher notched impact energy, but load-bearing ribs may require increased section modulus to compensate for the lower stiffness. Published data for direct substitution into gear or bearing applications without redesign is limited.
In terms of moisture uptake, PA12 absorbs substantially less water than PA6 and PA66. A PA66 moulding conditioned to equilibrium at 50% relative humidity may contain roughly 2.5% water by weight and up to 8% at saturation; the PA12 matrix of XE 3841 nat is reported at 0.7% after 24 h and remains below 1.5% at saturation. This reduces the shift in dimensions and glass-transition-related properties in humid service. For multi-cavity tooling, lower moisture uptake also narrows batch-to-batch variation in moulded part mass when production intervals extend beyond 4 h.
Drying upstream of melt processing is a critical control point. Residual moisture in impact-modified PA12 above 0.10% hydrolyses the amide backbone during plastication, producing surface splay, gas porosity, and a measurable reduction in notched Charpy at -30 °C. For bags left open at 50–60% relative humidity, the material can reach this threshold within a single shift; therefore, drying in a dehumidified-air dryer at 80 °C for 4–6 h to a dew point of -30 °C or lower is recommended. The hopper should be purged with dry air and maintained above 60 °C to prevent moisture re-adsorption.
Injection moulding of XE 3841 nat on general-purpose three-zone screws with 20:1 to 25:1 L/D ratios is performed with a measured melt temperature of 230 °C to 250 °C and a mould wall temperature of 40 °C to 80 °C. Barrel set points are typically 200–220 °C in the compression zone, 220–240 °C in the metering zone, and 230–250 °C at the nozzle. Back pressure should be limited to 30–60 bar; screw rotation should be regulated to 0.2–0.3 m/s peripheral speed. Higher shear rates can generate viscous heating above 260 °C, causing yellowing of the natural compound and preferential degradation of the impact modifier. A screw with a compression ratio of 2.2:1 to 2.6:1 is preferred; high-compression barrier screws are not recommended because the elastomeric phase may separate under excessive shear.
Residence time of the melt in the barrel and hot-runner system should not exceed 10 min. Production-scale moulding trials with hot-runner systems have shown that longer residence times shift the notched Charpy at -30 °C from 8 kJ/m² toward 5 kJ/m² and increase visible yellowing. Regrind from sprues and runners may be re-introduced at up to 20% by weight when the regrind is dried to the same residual moisture target; repeated heat history above two or three cycles reduces low-temperature impact and should be qualified per product. Purging after shutdown should be performed with a polyolefin or commercial barrel cleaner that is stable in the 230–250 °C range.
When service temperatures fall below -20 °C, material selection in polyamide parts is governed by notched impact and the ductile-to-brittle transition. For XE 3841 nat, the dry notched Charpy value at -30 °C is 8 kJ/m². Unmodified medium-viscosity PA12 is frequently reported at 4–6 kJ/m² under the same conditions, while PA12-GF30 may drop below 3 kJ/m² and fail by brittle fracture. The retention of 8 kJ/m² is significant because it places the material above the commonly used screening threshold for impact-loaded snap-fit designs in cold-climate assembly operations.
The thermal profile reflects the semicrystalline PA12 matrix. The dry HDT/B at 0.45 MPa is 105 °C under ISO 75-2, and the Vicat softening temperature VST/A/50 is 140 °C under ISO 306. These values are lower than glass-fibre-reinforced PA12 compounds and amorphous high-Tg transparent polyamides. Therefore, XE 3841 nat is not intended for continuous load-bearing service above 100 °C. Creep compliance under ISO 899-1 should be measured for any application sustained above 80 °C.
In hydrocarbon and oil environments, the PA12 base of XE 3841 nat retains resistance to aliphatic and aromatic hydrocarbons, fuels, greases, and many polar solvents at ambient temperature. However, the impact-modified phase reduces resistance to hot mineral oils and repeated steam sterilisation compared with unmodified PA12. The material is not suitable for continuous exposure to strong acids, strong bases, concentrated phenol solutions, or hot chlorinated solvents. Compliance for food-contact, drinking-water, or medical device use must be verified against the relevant regulation—for example, EU 10/2011 or FDA 21 CFR 177—because the raw polymer designation does not by itself certify a finished article.
Natural polyamide 12 has limited weathering resistance; prolonged outdoor exposure may cause surface chalking and loss of impact. If outdoor UV exposure is required, a black UV-stabilised variant should be evaluated. The natural designation also does not guarantee optical clarity; translucency varies with wall thickness, mould temperature, and cooling rate. Thin sections below 2 mm may appear translucent, while thicker sections become hazy. For applications requiring light transmission, haze and luminous transmittance should be validated under ASTM D1003 or ISO 13468 on moulded plaques of production thickness.
The main application space includes injection-moulded snap-fit closures, translucent protective housings, cold-climate cable connectors, pneumatic connectors, and sporting goods frames. Dimensional stability in humid environments is supported by moisture uptake of 0.7% at 24 h; by comparison, PA66 at saturation can exceed 8%. Mould shrinkage in injection-moulded sections ranges from 0.5% to 0.9%, and this should be incorporated into tooling design. Where optical transparency is required, the effect of wall thickness and processing history must be validated, because thick sections and high regrind content can reduce light transmission.
