| HS Code | 753713 |
| Density | 1.01 g/cm³ |
| Water Absorption 24h | 0.8% |
| Tensile Strength Yield Conditioned | 45 MPa |
| Elongation At Break Conditioned | 150% |
| Flexural Modulus Conditioned | 1000 MPa |
| Charpy Notched Impact 23 C Conditioned | 60 kJ/m² |
| Shore D Hardness Conditioned | 65 |
| Melting Point | 178 °C |
| Vicat Softening Temperature B50 | 130 °C |
| Heat Deflection Temperature 1 8 Mpa | 45 °C |
As an accredited EMS-Grivory Grilamid XE 3841 nat Nylon 12, Impact Modified, Conditioned factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged as sealed 25 kg multi-layer paper bags, nitrogen-blanketed to preserve the conditioned, impact-modified Nylon 12 pellets. |
| Container Loading (20′ FCL) | EMS-Grivory Grilamid XE 3841 nat Nylon 12, Impact Modified, Conditioned loaded in 20′ FCL: sealed bags on pallets, secured, dry ventilation. |
| Shipping | Grilamid XE 3841 nat is supplied as conditioned Nylon 12 pellets in sealed, moisture-resistant bags. Ship as non-hazardous plastic resin, protected from moisture, heat, and direct sunlight. Keep dry during transit and storage; avoid puncturing packaging to preserve material properties. |
| Storage | Store Grilamid XE 3841 in its original, sealed container in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and moisture. Keep the container tightly closed when not in use to prevent moisture absorption and contamination. Avoid contact with strong oxidizers and materials incompatible with polyamide. Maintain ambient temperatures. |
| Shelf Life | Shelf life is indefinite if stored unopened in original packaging in a cool, dry place, avoiding sunlight and moisture. |
The downstream application scope for EMS-Grivory Grilamid XE 3841 nat Nylon 12, impact modified and conditioned, is limited to process routes where the combination of low water absorption, low-temperature impact retention, and hydrocarbon resistance is specified in production drawings. Each scenario below includes the applicable compliance test designation, the addition ratio of the base resin to regrind or masterbatch, the main downstream processing sequence, and the terminal component geometry. Processing limits expressed in this document are drawn from standard PA12 extrusion and injection practice; where the exact value for this specific conditioned impact-modified configuration is not available in public literature, the limitation is stated rather than extrapolated.
| Process variable | Control range | Failure boundary | Test or monitoring method |
|---|---|---|---|
| Drying temperature and time | 80°C for 4–6 h | Residual moisture above 0.10% | ISO 15512:2016 method B |
| Melt temperature in extrusion | 225–245°C | Above 250°C for more than 5 min | In-line infrared melt thermocouple |
| Screw residence time | 5–10 min | Above 15 min at 245°C | Purging tracer study at startup |
| Clean internal regrind fraction | 0–20 wt% | Above 20 wt% in pressure-rated tube | Lot-release burst retention test |
| Vacuum sizing water temperature | 40–60°C | Deviation greater than ±5°C | Closed-loop heat exchanger with PID control |
In commercial vehicle air brake line production, the use of Grilamid XE 3841 nat is concentrated in pressure-retaining tubes with 6 mm to 16 mm outside diameter and 1 mm to 3 mm wall thickness, where SAE J844 and ISO 7628-1 control burst resistance, low-temperature impact, and marking. The standard addition ratio is 100 parts by weight per hundred resin (phr) base material; carbon black masterbatch is metered separately at 2.0–3.0 wt% to provide UV stabilization, and clean internal regrind is permitted up to 20 wt% only after three consecutive lot-release evaluations confirm that burst pressure retention remains within the acceptance boundary of SAE J844 after oven aging. Downstream processing on a production-scale single-screw extruder with L/D 30:1 and a melt pump requires a feed-zone temperature of 180–200°C, a barrel profile from 210°C to 240°C, and a die-head temperature of 230°C. The conditioned moisture content of the pellets is measured by ISO 15512:2016 method B before hopper loading; if residual moisture exceeds 0.10%, the material is dried at 80°C for 4–6 h using desiccant dryers with a dew point of -40°C or lower. In production-scale runs on a 45 mm extruder operating at 30–45 min⁻¹, the main source of dimensional scrap is not melt delivery but vacuum fluctuation caused by inadequate water temperature control in the first sizer chamber; water temperature is therefore maintained at 40–60°C with a tolerance of ±5°C to avoid melt cone freezing or tube ovality. The melt is sized in a two-chamber vacuum calibrator, printed with a lot code, hauled by a belt puller at a line speed of 15–40 m/min, and cut into straight lengths or formed into coiled trailer sets. Terminal finished products include 6 mm, 8 mm, 10 mm, 12 mm, and 16 mm OD air brake tube assemblies for tractor-trailer service lines, spring brake supply lines, and air suspension feed lines. Melt temperature above 250°C or residence time beyond 10 min causes chain scission and a measurable drop in elongation at break under ISO 527-2:2012.
Reducing the pipe diameter to 4–12 mm for industrial pneumatic control lines shifts the process constraint from thermal degradation in thick wall sections to melt fracture and fitting retention after cyclic pressure. The formulation addition ratio is tightened to 100 phr Grilamid XE 3841 nat with 2.0 wt% colour masterbatch and ≤10 wt% clean regrind; higher regrind fractions broaden the die-swell band and increase the rejection rate on close-tolerance tube outside diameter. Compliance is verified under ISO 14743:2004 for push-in fittings and ISO 527-2:2012 for tensile strain at break after conditioning at 23°C and 50% RH. In production, a single-screw extruder with L/D 24:1 to L/D 30:1 is operated at melt temperature 225–240°C, with haul-off speed set to maintain a draw-down ratio of 1.05–1.25. The die land length is increased to 8–12 times the die gap to reduce extrudate swell at shear rates of 800–1,200 s⁻¹; if the melt temperature falls below 218°C, surface melt fracture appears as transverse ridges without a corresponding change in bulk melt pump pressure. Vacuum sizer pressure is set between 2.5 kPa and 4.0 kPa because higher vacuum causes the softened inner wall to collapse in thin-section tube before the outer surface solidifies. Terminal finished tubes are supplied as 4×1 mm, 6×1 mm, 8×1 mm, 10×1 mm, and 12×1 mm OD×wall coils in blue, natural, and black, with cut ends calibrated for push-in fittings. The operational boundary for this grade in pneumatic service is continuous dry air up to 60°C; for higher temperatures, fitting retention must be re-qualified at the fitting manufacturer’s specified torque, and plasticized PA11 may be required where higher flex fatigue is specified.
Because fuel vapour return lines in spark-ignition powertrains are exposed to mixed aromatic hydrocarbon permeation and underbonnet thermal cycling, the natural conditioned PA12 is processed as a mono-wall tube or as an inner liner in a co-extruded structure. The formulation addition ratio for a mono-wall vapour return line is 100 phr Grilamid XE 3841 nat, with 2.0–2.5 wt% carbon black masterbatch only when UV resistance is specified; for a co-extruded design, the inner layer occupies 20–25% of total wall thickness, with the remaining wall formed by a tie layer and a PA12 outer layer containing 2.0–3.0 wt% stabilizer masterbatch. Industry compliance is evaluated according to SAE J2260 for nonmetallic fuel system tubing and ISO 13775-1 for thermoplastic fuel tubing; permeation testing is performed under the reference fuel specified in SAE J1681 rather than inferred from PA12 homopolymer values. Downstream production uses co-extrusion heads with separate extruder barrels for each layer, melt temperature 230–245°C, vacuum sizing, and inline laser diameter gauging at 0.01 mm resolution. The formed line is post-treated in a hot-air forming station at 150–170°C to shape quick-connector ends. Terminal parts are 6×1 mm and 8×1 mm vapour return lines with square-cut or bead-formed ends, often supplied in just-in-time kits for fuel tank modules. Published permeation data for this specific natural impact-modified configuration is limited; actual emission performance must be verified per SAE J2260 or ISO 13775-1 using the production wall thickness and not extrapolated from unfilled PA12.
Corrugated cable protection conduit extruded from Grilamid XE 3841 nat is specified where cable harnesses in electric buses and off-road machinery require abrasion resistance and impact-modified low-temperature flexibility without stainless-steel armoring. The compound is metered at 100 phr base resin plus 3.0 wt% carbon black masterbatch for UV performance and 0.3 wt% of a fatty acid amide-based anti-block additive to reduce blocking of slit-wall conduit on vertical storage racks. Compliance is tested under IEC 61386-1:2017 for compression and impact, ISO 6722-1:2011 for thermal ageing of road vehicle cable management components, and ISO 178:2019 for flexural modulus before and after heat exposure. Production is carried out on a corrugator line consisting of a single-screw extruder with L/D 30:1, melt temperature 235–250°C, and a vacuum corrugator with mould blocks maintained at 25–35°C. Vacuum pressure at the mould face is held at -30 kPa to -60 kPa; insufficient vacuum produces flats on the corrugation inner surface, while excessive vacuum draws melt into the block seams and creates axial flash. The line speed for nominal 13.0 mm, 21.2 mm, 28.5 mm, 42.5 mm, and 54.0 mm conduit ranges from 6 m/min to 15 m/min, with wall thickness from 0.25 mm to 0.70 mm. Terminal products are slit or unslit corrugated conduit in black, cut into 2 m to 6 m stick lengths or supplied as continuous coil for automated harness taping lines. The continuous service boundary is not the melt peak but oxidative embrittlement above 125°C; parts subjected to 3,000 h at 125°C according to ISO 188 should be evaluated for elongation retention, because the impact modifier may degrade before the PA12 backbone.
For injection-moulded impact-modified harness clips and thick-wall clamps, the conditioned moisture level of Grilamid XE 3841 nat becomes a process variable controlling melt viscosity and final notched impact. The formulation ratio is 100 phr base resin with ≤10 wt% clean sprue and runner regrind; external-application parts may include 0.1–0.3 wt% mould release agent only when ejection marks exceed the drawing limit. Compliance is classified under ASTM D4066-21 polyamide group 12 and tested for notched Charpy impact by ISO 179-1/1eA, tensile yield by ISO 527-2:2012, and flammability by UL 94 HB where required. Moulding is performed on a closed-loop hydraulic or electric injection machine; barrel temperatures are set from feed 200°C to nozzle 245°C, mould temperature is held at 40–70°C, holding pressure is set at 40–70 MPa, and screw speed is limited to 40–80 min⁻¹ because the high-molecular-weight impact-modified grade generates melt-pressure fluctuation under high shear. Gate freeze time in a two-cavity cold-runner tool is typically 6.0–8.0 s for a 1.5 mm gate land; thick sections above 3.0 mm require a larger gate and lower injection velocity to prevent gas entrapment. Terminal finished products are cable harness clips, clip-nut caps, push-in fasteners, and clamp halves used in engine bay electrical routing and chassis cable fixing. The operational boundary is thin-wall filling: wall sections below 0.8 mm are not recommended for this grade because the conditioned impact modifier raises viscosity relative to unmodified PA12, and short shots occur before venting defects are visible.
Spiral and braided hydraulic return hose jacketing made from Grilamid XE 3841 nat is processed at lower draw ratio than rigid tube to protect the underlying cord layer from abrasion and oil splash. The compound addition ratio is 100 phr base resin with 2.5 wt% carbon black masterbatch and ≤15 wt% clean regrind; regrind above this level increases die-pressure fluctuation and causes localized wall thinning at the crosshead spider. Compliance for hydraulic hose outer cover is evaluated according to SAE J517 for oil resistance and abrasion, supplemented by ISO 1817:2015 for resistance to mineral oil and ISO 527-2:2012 for tensile strain after immersion. Extrusion is carried out on a crosshead die with a melt temperature of 230–250°C, a die pressure of 8–14 MPa, and a cooling trough at 20–30°C. The draw-down ratio is limited to 1.05–1.15 to avoid locking the jacket onto the core before final cooling. Terminal products include 8–25 mm ID hydraulic return hose with a 0.6–1.2 mm PA12 jacket, supplied as cut lengths or continuous coils. The principal incompatibility is phosphate ester hydraulic fluid; direct contact at temperatures above 80°C requires fluid-specific immersion testing under ISO 1817:2015, because PA12 softens in certain phosphate ester formulations and the impact modifier can lower the softening onset.
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EMS-Grivory Grilamid XE 3841 nat is a natural-colour, impact-modified polyamide 12 grade supplied and evaluated in the conditioned state. The base polyamide 12 chemistry provides low moisture uptake and high resistance to aliphatic hydrocarbons, while the impact-modification package shifts the failure mode from brittle fracture to ductile tearing at sub-zero temperatures. Typical conversion routes include single-screw extrusion of pneumatic tubing and injection moulding of snap-fit connectors. Because the conditioned state represents the service condition after moisture equilibration, mechanical data determined after ISO 1110 accelerated conditioning or 23°C and 50% RH storage are more relevant for design than dry-as-molded values. The grade should be specified with the exact natural designation when colour-independent mechanical performance is required; pigmented variants may show slightly different mould shrinkage and impact retention. Under polyamide classification practice, the material is designated as an impact-modified PA12. The natural colour contains no hiding pigments, so lot-to-lot translucency can vary without indicating a change in base resin or impact-modifier chemistry.
In unmodified PA12, low-temperature impact response is governed by the mobility of the amorphous phase. The elastomeric domains introduced in XE 3841 nat act as stress concentrators that trigger multiple shear bands and cavitation ahead of the notch tip; this converts a sharp crack into a diffuse damage zone. The consequence is a notched Charpy impact response that remains in the no-break region at 23°C under ISO 179-1/1eA, while unmodified PA12 of similar molecular mass typically exhibits partial break energies between 5 kJ/m² and 15 kJ/m². The tensile modulus of XE 3841 nat in the conditioned state is reported in the range of 200 MPa to 350 MPa under ISO 527-1/-2, which is approximately one-fourth to one-sixth of the modulus of unmodified PA12. The trade-offs are a lower yield stress and higher creep compliance under sustained load; components subjected to continuous tensile stress should be evaluated against creep-rupture data rather than short-term tensile strength.
Downstream processing affects this morphology. Excessive melt temperature above 250°C or high-shear screw configurations can coalesce the elastomer phase and depress low-temperature impact. Converters should avoid barrier screws with narrow clearances and hold melt residence time below 10 min at recommended melt temperatures. Differential scanning calorimetry under ISO 11357-3 typically shows a PA12 melting endotherm near 175°C to 180°C; the impact-modifier phase may contribute a separate lower-temperature transition that should not be interpreted as a secondary PA12 crystal form. This thermal signature is useful for release testing but does not replace mechanical qualification after conditioning.
Before processing, the material must be dried to a residual moisture level below 0.10%. A desiccant dryer with an inlet dew point of -30°C or lower is recommended; typical drying conditions are 80°C for 4 h to 6 h. Drying at temperatures above 100°C or for extended periods can cause yellowing. For extrusion, barrel zone settings from feed to die are typically distributed between 180°C and 230°C; melt temperature measured at the die should remain below 240°C. Single-screw extruders with L/D 20:1 to 25:1 and a compression ratio of 2.5:1 to 3:1 are adequate for tube and profile lines. Injection moulding requires a melt temperature of 200°C to 240°C and a mould temperature of 20°C to 60°C; higher mould temperatures reduce post-mould shrinkage but increase cycle time.
Melt volume-flow rate at 275°C under 5 kg is generally reported between 10 cm³/10 min and 20 cm³/10 min under ISO 1133-1, placing the grade in the medium-viscosity range for PA12 extrusion. On extrusion lines producing 4 mm to 12 mm OD pneumatic tubing, surface tack and diameter oscillation appear when melt temperature exceeds 250°C because the impact-modifier phase degrades and forms low-molecular-weight fractions at the die lip. Melt pressure fluctuations greater than ±0.5 MPa at constant screw speed often indicate melt-temperature inhomogeneity or feed bridging; corrective action is required before tube wall-thickness variation exceeds ±0.05 mm. Injection moulders should sequence hold pressure using gate-seal studies because the low modulus of the conditioned material delays gate freeze relative to unmodified PA12. Hydraulic hold pressures from 40 MPa to 80 MPa and injection speeds of 50 mm/s to 150 mm/s are workable starting values, but cavity balance and gate geometry control final part flatness.
The processing window is narrow in the upper temperature region. Thermal degradation of PA12 proceeds through chain scission with evolution of carbon dioxide and ammonia above 300°C; however, discolouration and surface defects in impact-modified grades can appear above 250°C well before catastrophic decomposition. For this reason, melt-temperature monitoring at the die or nozzle is more useful than barrel set-point confirmation. Production lots with high residual moisture may foam even at normal melt temperatures because moisture vaporises during plastication; this is a batch-level failure mode requiring dryer dew-point verification and, if necessary, extended drying.
The effect of conditioning on PA12 is smaller than on PA6 or PA66 but remains a manufacturing variable. After equilibration at 23°C and 50% RH, the grade absorbs approximately 0.5% to 0.7% water by mass; at saturation under ISO 62, absorption is higher. Moisture uptake in unfilled PA12 follows Fickian diffusion at moderate humidity, with an effective diffusion coefficient on the order of 10⁻¹² m²/s at room temperature. For a 2 mm wall section, equilibrium at 50% RH can therefore require several weeks unless accelerated conditioning is used. Absorbed water plasticizes the amorphous phase, reducing tensile modulus by 20% to 40% relative to dry-as-molded values and increasing elongation. Dimensional growth after conditioning is measurable: tube lengths may grow by 0.1% to 0.3% depending on orientation and wall thickness. Production lines that cut tube to length before moisture equilibration should anticipate this growth or store pre-cut lengths in sealed polyethylene bags until final assembly. Dimensional checks performed on dry parts immediately after extrusion can pass, while conditioned parts of the same lot may exceed drawing tolerances.
Substituting dry-as-molded tensile values for conditioned PA12 can overstate stiffness by 20% to 40%. For snap-fit connectors, this substitution may result in insufficient deflection force, while for pneumatic tube burst-pressure calculations it may lead to under-predicted expansion under pressure. The comparative property envelope in Table 1 distinguishes the impact-modified conditioned grade from general-purpose unmodified PA12.
| Property | Test method | Grilamid XE 3841 nat | Unmodified PA12 |
|---|---|---|---|
| Density | ISO 1183-1 | 0.99–1.02 g/cm³ | 1.01–1.05 g/cm³ |
| Tensile modulus | ISO 527-1/-2 | 200–350 MPa | 900–1,400 MPa |
| Tensile stress at yield | ISO 527-1/-2 | 6–10 MPa | 25–40 MPa |
| Notched Charpy impact, 23°C | ISO 179-1/1eA | No break / >80 kJ/m² | 5–15 kJ/m² |
| Notched Charpy impact, -30°C | ISO 179-1/1eA | 8–20 kJ/m² | 5–10 kJ/m² |
| Water absorption at saturation | ISO 62 | 0.6–0.9% | 1.0–1.5% |
These ranges are compiled from supplier technical literature and are not specification minima. Lot-release data on the certificate of analysis and the current EMS-Grivory technical datasheet control for the specific shipment. Published data for the exact impact-modifier type and particle-size distribution in XE 3841 nat is limited; mechanical performance should not be extrapolated from other impact-modified PA12 grades without first-mould validation. The property envelope also reflects the strong anisotropy of injection-moulded samples; tensile values measured on plaques should not be transferred directly to small-diameter tube geometries without verification.
PA12 in XE 3841 nat resists aliphatic hydrocarbons, mineral oils, greases, dilute alkali, and many automotive service fluids. The impact-modified phase is more sensitive than the PA12 matrix to strong oxidizing acids, phenols, cresols, chlorinated solvents, and high concentrations of formic acid. Stress cracking can occur when parts are exposed to zinc chloride solutions or road de-icing brines under high tensile stress; test coupons under external load may show surface crazing before bulk chemical attack is visible. For pneumatic tubing in automotive assemblies, component-level testing under ISO 7628 or customer-specific thermal cycling with diesel, urea, and compressed-air condensate is required. Material-only chemical resistance data do not capture fitting stress, ozone exposure, or vibration fatigue. Permeation coefficients measured on the exact wall thickness and conditioning state should be used for fuel-vapour or gas-transport calculations.
Regulatory statements are article-level. The natural grade may be evaluated against EU Regulation 10/2011 for plastics intended for food contact, and FDA 21 CFR 177.1500 for nylon resins, but specific migration and end-use limitations require processing trials. Electrical and electronic applications are subject to IEC 62631-3-1 for dielectric properties and IEC 60112 for comparative tracking index. The grade is not inherently flame retardant and should not be specified for glow-wire applications without additional evaluation under IEC 60695-2-11. Heavy metal and flame retardant restrictions under RoHS Directive 2011/65/EU and candidate substance reporting under REACH should be confirmed through the supplier’s declaration for the specific lot; raw-material declarations do not transfer to finished article compliance.
| Standard or regulation | Scope | Relevance to this grade |
|---|---|---|
| ISO 1183-1 | Density of non-cellular plastics | Density release and material classification |
| ISO 527-1/-2 | Tensile modulus, yield stress, elongation | Conditioned design stiffness and strength |
| ISO 179-1/1eA | Notched Charpy impact | Low-temperature ductility verification |
| ISO 1110 | Accelerated moisture conditioning of polyamides | Standard conditioning before mechanical testing |
| ISO 62 | Water absorption | Moisture uptake and dimensional stability |
| ISO 1133-1 | Melt volume-flow rate | Rheological lot control |
| IEC 60112 | Comparative tracking index | Electrical safety for moist environments |
| RoHS 2011/65/EU | Restricted substances in electrical and electronic equipment | Article-level compliance |
| EU 10/2011 | Food-contact plastics | Migration testing if food contact is claimed |
| REACH | Chemical substance registration and candidate list | Supply-chain communication |
Compared with glass-reinforced PA12 grades, XE 3841 nat offers lower modulus and greater elongation, which is advantageous for tubing that must flex repeatedly at -40°C without kinking. Compared with PA6 and PA66 impact-modified grades, the PA12 backbone provides lower equilibrium moisture absorption and greater dimensional stability in humid environments, but at higher raw-material cost. The grade is not a direct substitute for unmodified PA12 in components where creep modulus or surface hardness governs the design; for such parts, a filled or unmodified PA12 should be selected. Because the condition of the part after moisture uptake controls final properties, inspection protocols should include a defined conditioning interval and should report the test atmosphere alongside every mechanical result.
