| HS Code | 898992 |
| Density | 1.04 g/cm³ |
| Melting Point | 189 °C |
| Tensile Strength | 55 MPa |
| Elongation At Break | 250% |
| Flexural Modulus | 950 MPa |
| Water Absorption 24h | 0.9% |
| Shore Hardness D | 70 |
| Vicat Softening Temperature | 140 °C |
| Heat Deflection Temperature 0 45 Mpa | 150 °C |
| Electrical Strength | 24 kV/mm |
As an accredited Arkema Rilsan MB 3610 NAT PA11-I factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg sealed multi-layer bags inside sturdy cardboard boxes, protecting the PA11 powder from moisture and contamination. |
| Container Loading (20′ FCL) | 20′ FCL: Arkema Rilsan MB 3610 NAT PA11-I polyamide granules, packed in sealed bags on pallets, loaded securely for transport. |
| Shipping | Arkema Rilsan MB 3610 NAT PA11-I is a bio-based polyamide 11 resin supplied in sealed bags or drums. Ship as non-hazardous dry granular material, keeping it dry and away from excessive heat or moisture. Avoid prolonged exposure to sunlight; secure loads properly and store upright until use. |
| Storage | Store Rilsan® MB 3610 NAT PA11-I in its original, unopened packaging in a cool, dry, well-ventilated area away from direct sunlight and heat sources. Keep the container tightly sealed to prevent moisture absorption, which can affect performance. Ideal temperature is below 25°C. Avoid exposure to rain, condensation, and extreme temperature fluctuations. |
| Shelf Life | Shelf life is typically 2 years when stored unopened in original packaging in a cool, dry place. |
Arkema Rilsan MB 3610 NAT PA11-I is selected for injection-molded SAE J2044 quick-connector bodies in gasoline vapor return and evaporative emission circuits where cold insertion force, fuel condensate resistance, and thermal cycling stability are evaluated on the same part. The resin is pre-dried at 80 °C for 4 h to 6 h in a desiccant dryer with a dew point no higher than -40 °C; residual moisture above 0.08 wt% produces surface splay and hydrolysis-related viscosity loss in thin gate regions. A general-purpose polyamide screw with an L/D ratio of 20:1 to 24:1 and compression ratio of 2.5:1 is used, with rear barrel zone at 230 °C, middle zones at 250 °C to 270 °C, and nozzle at 260 °C. Melt residence time at 260 °C is kept below 10 min to prevent thermal degradation that manifests as reduced snap-ring retention. Mold temperature is maintained at 60 °C to 80 °C, and injection speed is set medium-high to avoid jetting at the gate; holding pressure is held at 60 MPa to 80 MPa for gate sealing. Hot runner balance across 24-cavity tooling is checked so cavity melt temperature deviation does not exceed ±2 °C; fill imbalance above 5 % causes sink and dimensional shift at snap fingers. Regrind is limited to 20 wt%; higher recycled content has been observed in multi-cavity production trials to increase cavity-to-cavity variation in insertion force and to reduce resistance to fuel vapor condensate stress cracking. Compliance validation follows SAE J2044 for quick-connector functional requirements and ISO 16750-4 for thermal shock and vibration exposure. Terminal components include retainer clips, purge valve bodies, and multi-port connectors for underhood fuel vapor management.
The technical basis for choosing unfilled PA11-I over PA66 in low-voltage connector housings is moisture uptake at saturation rather than dry-as-molded tensile strength. Per ISO 62, unfilled PA11 tested in water at 23 °C absorbs approximately 1.9 wt% at saturation, while PA66 exceeds 8 wt%; this differential preserves pitch spacing and creepage distance retention under condensation cycling. Thin-wall sections down to 0.5 mm are molded using a fast injection profile with melt temperature at 250 °C to 270 °C and mold temperature at 40 °C to 60 °C. Tooling is gated at the thickest cross-section and vented to 0.02 mm to 0.03 mm depth because unfilled melt exhibits short-shot sensitivity in long flow channels. Comparative tracking index is evaluated under IEC 60112, and clearance/creepage distances follow IEC 60664-1. Flame classification for natural unfilled PA11 is typically UL 94 HB at 1.5 mm; designs requiring V-2 must be validated on the final article, not assumed from resin data. Finished parts include sensor connector housings, terminal blocks, and low-voltage diagnostic sockets where humidity exposure is a known field condition.
Molding low-pressure pneumatic push-in fitting bodies from the unfilled PA11-I grade shifts the acceptance criterion from initial pull-out force to retention force after hygroscopic swelling. The material is injected into multi-cavity molds with core pins held to H7 tolerance; after ejection, bores are inspected against ISO 286-2 limits because out-of-roundness above 0.03 mm reduces collet locking force under pressure cycling. The grade is selected over PA6 due to lower saturated water uptake, which limits bore closure in compressed-air circuits operating with pressure dew points from -20 °C to +3 °C as defined in ISO 8573-1 water classes. Processing uses a melt temperature of 260 °C to 280 °C, mold temperature of 70 °C to 90 °C, and a holding time sufficient to avoid sink marks at threaded insert zones. Regrind is limited to 15 wt% when fitting bodies must pass ISO 14743 burst and leakage requirements at 1.0 MPa working pressure. Terminal components include push-in connectors, flow-control valve bodies, and silencer housings for compressed-air distribution networks.
| Scenario | Pre-drying | Melt temperature | Mold temperature | Regrind limit | Dominant process defect |
|---|---|---|---|---|---|
| SAE J2044 quick connectors | 80 °C, 4 h–6 h | 255 °C–275 °C | 60 °C–80 °C | 20 wt% | Splay, jetting at gate |
| Low-voltage connector bodies | 80 °C, 4 h | 250 °C–270 °C | 40 °C–60 °C | 20 wt% | Short shot in 0.5 mm walls |
| Pneumatic push-in fittings | 80 °C, 6 h | 260 °C–280 °C | 70 °C–90 °C | 15 wt% | Out-of-round bore, sink at inserts |
| Outdoor cold-impact clips | 80 °C, 4 h–6 h | 250 °C–270 °C | 30 °C–50 °C | 20 wt% | Knit-line brittleness |
The use of unfilled PA11-I in molded buckles, harness clips, and ski binding subcomponents is evaluated through notched impact response at -30 °C because field failures in PA6 and PA66 frequently initiate at gate vestiges or knit lines. Specimens are conditioned and tested according to ISO 179-1/1eA; the acceptance gate-region failure surface must remain ductile, without brittle crack propagation. Tensile properties are recorded per ISO 527-2 at 23 °C and 50 % RH for lot release, but cold impact is the controlling criterion when parts are used in winter environments. Tooling places knit lines away from high-tensile corners, and hot runner balance is held to ±2 °C across cavities. Ejection temperature is kept below 60 °C to prevent distortion, and holding pressure is profiled to minimize molded-in stress at snap-fit undercuts. No external plasticizer is required, so long-term surface tack and dirt accumulation are avoided. Finished components include adjustable pack buckles, rope clamps, and cold-weather harness fittings for mountaineering and industrial restraint systems where load-bearing certification is handled at the assembly level.
Non-invasive diagnostic and laboratory equipment housings are molded from unfilled PA11-I where repeated wiping with 70 % isopropanol or ethanol solutions is a service condition. Chemical resistance is quantified by tensile property retention after immersion per ASTM D543; where acceptance thresholds are device-defined, a frequently used screening limit is at least 80 % retention of tensile strength after 24 h exposure at 23 °C. Cytotoxicity data are generated to ISO 10993-5, and intracutaneous reactivity is evaluated to ISO 10993-10 on selected lots. The grade is not indicated for implantation or prolonged blood contact. Processing for housing shells and lens covers uses mold temperature at the upper end, 80 °C to 90 °C, to maximize crystallinity and reduce solvent microcracking at gate weld lines. Melt temperature is set at 255 °C to 275 °C; packing pressure is reduced near the end of the holding phase to limit molded-in stress at snap-fit undercuts. External mold release agents are excluded from these tools, and regrind is typically excluded from patient-contact and diagnostic device housings unless lot-to-lot validation demonstrates retained biocompatibility. Terminal components include handheld probe shells, benchtop analyzer front panels, and reagent cartridge docking stations.
When molded fittings and valve bodies are intended for intermittent drinking-water contact, the supplier’s certification dossier must cover the specific grade and the finished article; resin certification alone does not constitute regulatory approval. In such applications, unfilled PA11-I has been used for reverse osmosis fittings, water dispenser internals, and inline connectors where low water absorption stabilizes thread torque after repeated wet-dry cycles. The resin is processed at the low end of the melt range, 245 °C to 260 °C, with melt residence time kept under 8 min to reduce organoleptic carryover from thermal degradation. Mold temperature is maintained at 60 °C to 80 °C; mold release agents are excluded. Regrind policy is application-defined: some potable water programs prohibit regrind entirely, while others permit 10 wt% to 20 wt% of internally generated scrap from the same compliant lot. Leaching and sensory test methods follow regional schemes such as NSF/ANSI/CAN 61 in North America, AS/NZS 4020 in Australia/New Zealand, and WRAS or KTW-BWGL in European and UK markets. The terminal components are finished fittings, distribution manifold segments, and quick-connect coupling bodies for under-sink water systems.
| Terminal application | Primary standards and test methods | Validation condition |
|---|---|---|
| Automotive quick connectors | SAE J2044, ISO 16750-4 | Thermal shock, vibration, insertion force |
| Low-voltage connectors | IEC 60664-1, IEC 60112, UL 94 HB | Clearance/creepage, tracking, flame class |
| Pneumatic fittings | ISO 14743, ISO 8573-1 | Leakage and burst at 1.0 MPa |
| Outdoor clips | ISO 179-1/1eA, ISO 527-2 | Notched impact at -30 °C |
| Diagnostic housings | ISO 10993-5, ASTM D543 | Cytotoxicity, chemical retention |
| Potable water contact | NSF/ANSI/CAN 61, AS/NZS 4020, WRAS | Leaching, sensory |
| Battery-management clips | ISO 527-2, ISO 188 | Heat aging, tensile retention |
Molded cable clamps, routing clips, and busbar insulator clips in electric vehicle battery management systems are produced from unfilled PA11-I where the service environment includes exposure to glycol-water coolant, electrolyte fumes, and road splash. Continuous use at 85 °C and short-term excursions to 125 °C are assessed by tensile strength retention after air-oven aging according to ISO 188, with tensile testing per ISO 527-2. The melt is processed at 250 °C to 270 °C, with mold temperature at 50 °C to 70 °C. Cavity filling must avoid jetting at gate lands; gate diameter is set at 60 % to 80 % of the nominal wall thickness to prevent premature freeze-off in long-flow clip geometries. Regrind is limited to 25 wt% where tensile strength retention must remain within ±5 % of virgin values. Dimensional inspection is integrated into cavity-pressure monitoring; serial production parts are checked for warpage and gate vestige height. Finished articles include cable clips, high-voltage harness brackets, and busbar insulator clips.
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Arkema Rilsan MB 3610 NAT is a natural-colour, unplasticised polyamide 11 homopolymer supplied under the PA11-I descriptor in the manufacturer’s injection-moulding product line. The polymer is synthesised by polycondensation of 11-aminoundecanoic acid from castor oil, yielding a repeating structure with ten methylene segments per amide group. This long aliphatic sequence reduces amide group density relative to PA6 and PA66, lowering equilibrium moisture uptake at 50% RH to approximately 1.0–1.2 wt% and saturation uptake to 1.8–2.0 wt% under ISO 62, compared with 2.5–3.0 wt% at 50% RH for PA6. The MB 3610 designation identifies the grade within the Rilsan PA11 injection-moulding series; NAT denotes natural, unpigmented pellet colour. The PA11-I classification places the material among unplasticised PA11 injection grades, distinct from plasticised extrusion and blow-moulding variants in the product range. Grade-specific values are controlled by Arkema’s current technical datasheet; the representative ranges provided in Table 1 are drawn from published PA11 homopolymer data and should be verified against lot-specific certificates.
The principal process risk in injection moulding MB 3610 NAT is hydrolytic degradation if granulate is introduced to the reciprocating screw with absorbed moisture above 0.10–0.20 wt%. Closed-loop desiccant drying at 80–90 °C for 4–6 h is recommended, with hopper temperature maintained at 80 °C and dew point below −40 °C. On production-scale machines with 18:1–22:1 L/D general-purpose polyamide screws and compression ratios between 2.2:1 and 2.8:1, moisture-related splay, nozzle drool and batch-to-batch viscosity variation have been observed when ambient relative humidity exceeds 60%. Melt temperature should remain between 230 °C and 260 °C, with mould temperature selected from 30 °C to 90 °C depending on crystallinity and dimension-stability requirements. Residence time at processing setpoint should not exceed 8–10 min; longer residence times promote yellowing and molecular-weight loss through chain scission. Startup followed by HDPE or PP purging is used to displace degraded holdover material. Screw-back pressure in the 5–15 bar hydraulic range and injection pressures in the 80–120 MPa range are typical for thin-wall sections; gate freeze-off at mould temperatures below 30 °C has caused short-shot defects in multi-cavity tools. These boundaries derive from standard PA11 processing practice; the current Arkema processing guide for MB 3610 NAT remains the controlling source for lot-specific viscosity.
Table 1 summarises representative unplasticised PA11 homopolymer property ranges for Arkema Rilsan MB 3610 NAT.
| Property | Test standard | Representative range |
|---|---|---|
| Density | ISO 1183-1 | 1.03–1.04 g/cm³ |
| Melting temperature | ISO 11357-3 | 186–190 °C |
| Tensile modulus at 23 °C | ISO 527-2 | 1150–1300 MPa |
| Tensile yield stress | ISO 527-2 | 42–48 MPa |
| Nominal tensile strain at break | ISO 527-2 | 20–40% |
| Notched Charpy impact at 23 °C | ISO 179-1/1eA | 5–8 kJ/m² |
| Notched Charpy impact at −30 °C | ISO 179-1/1eA | 4–7 kJ/m² |
| Heat deflection temperature under 0.45 MPa | ISO 75-2 | 145–155 °C |
| Heat deflection temperature under 1.8 MPa | ISO 75-2 | 50–60 °C |
| Water absorption after 24 h | ISO 62 | 0.25–0.35 wt% |
| Mould shrinkage | ISO 294-4 | 1.0–1.5% |
The tensile modulus at 23 °C falls between 1150 MPa and 1300 MPa under ISO 527-2, with yield stress in the 42–48 MPa range and nominal tensile strain at break from 20% to 40%. Notched Charpy impact values under ISO 179-1/1eA typically remain in the 5–8 kJ/m² range at 23 °C and 4–7 kJ/m² at −30 °C, which is a practical distinction from PA6 and PA66 grades that exhibit sharper ductile-to-brittle transitions at low temperature. The melting temperature determined by ISO 11357-3 is 186–190 °C, while heat deflection temperature under 0.45 MPa load is 145–155 °C and under 1.8 MPa is 50–60 °C. Dimensional stability is supported by 24 h water absorption of 0.25–0.35 wt% and mould shrinkage typically 1.0–1.5% in flow direction. These ranges do not replace grade-specific certificates, and published data for this specific configuration are limited where application stresses exceed the boundaries of the ISO test specimens used to generate them.
Selection of MB 3610 NAT over PA6, PA66, or PA12 is often driven by the combination of low equilibrium moisture uptake, lower density, and resistance to aliphatic hydrocarbon service. The lower amide group density gives dimensional stability in humid environments that PA6 and PA66 cannot provide without reinforcement or conditioning. Relative to PA12, MB 3610 NAT has a higher melting temperature and higher tensile modulus; relative to PA6 and PA66, it has lower density and moisture uptake but lower tensile strength and lower heat deflection temperature under load. Table 2 contrasts the property classes using published typical ranges for unmodified grades.
| Polyamide | Density | Saturation water uptake | Melting temperature | Notched Charpy impact at 23 °C |
|---|---|---|---|---|
| PA11 MB 3610 NAT | 1.03–1.04 g/cm³ | 1.8–2.0 wt% | 186–190 °C | 5–8 kJ/m² |
| PA12 | 1.01–1.02 g/cm³ | 1.2–1.6 wt% | 174–180 °C | 6–10 kJ/m² |
| PA6 | 1.13–1.14 g/cm³ | 9–10 wt% | 220–225 °C | 5–7 kJ/m² |
| PA66 | 1.13–1.15 g/cm³ | 8–9 wt% | 260–265 °C | 4–6 kJ/m² |
The practical difference is most visible in humidity-dependent dimensional stability. PA6 and PA66 can require moisture conditioning before assembly, whereas PA11 MB 3610 NAT reaches service toughness without relying on absorbed water. The lower density of PA11 and PA12 also reduces part mass by roughly 8–10% compared with PA6 at equivalent wall section. Against PA12, the PA11-I grade is differentiated by higher melting point and higher tensile modulus, while PA12 typically shows lower saturation moisture uptake and lower density. Against plasticised Rilsan PA11 grades, MB 3610 NAT exhibits higher rigidity and lower elongation, with notched Charpy remaining above 5 kJ/m² at 23 °C.
In polyamide selection for fluid-handling components, the long aliphatic sequence of PA11-I gives an operational advantage because fewer amide sites are available for hydrogen bonding with polar penetrants. MB 3610 NAT is applied in injection-moulded fittings, connectors, and housings where intermittent contact with diesel, lubricating oils, grease, and phosphate ester hydraulic fluids is expected. Resistance data for PA11 homopolymer are commonly generated under ISO 1817 or ISO 175 by measuring property retention after immersion; published data for MB 3610 NAT in specific fuel blends such as high-aromatic oxygenated gasoline is limited, and candidate validation should use actual service fluids. The material is not a universal chemical barrier: concentrated strong acids, oxidising acids, and certain polar solvents attack the polymer; hot water above 80 °C can hydrolyse the amide backbone over extended exposure, and strong bases accelerate degradation. For applications requiring sustained exposure to methanol or ethanol blends above 10–15 vol% at elevated temperature, PA12 or fluoropolymer alternatives may show lower property loss; for applications requiring higher tensile strength at 120–150 °C, glass-filled PA66 grades may be mechanically superior but lose dimensional stability because of moisture uptake. The PA11-I grade also finds use in clip, snap-fit, and living-hinge components because dry-as-moulded notched Charpy impact at 23 °C remains above 5 kJ/m², reducing reliance on moisture conditioning before assembly.
Regulatory status for MB 3610 NAT depends on the final formulation and conversion conditions. Unplasticised PA11 homopolymer can be evaluated for food-contact compliance under FDA 21 CFR 177.1500 and European Framework Regulation (EC) No 1935/2004; specific migration testing must be completed on the finished article. The base resin is subject to REACH registration and RoHS Directive 2011/65/EU restrictions as supplied, but colourants, additives, or post-process contamination can alter compliance. Electrical insulation data for PA11 typically show volume resistivity above 10¹⁴ Ω·cm and surface resistivity above 10¹³ Ω under ASTM D257 or IEC 60093, making the grade suitable for low-voltage connectors where moisture resistance is required. The natural, unpigmented form provides a stable base for masterbatch tinting, but pigment carriers must be validated because some masterbatch systems shift melt-flow values and impact strength measured under ISO 179-1/1eA. MB 3610 NAT differs from plasticised Rilsan PA11 grades in lower elongation and higher rigidity, and from glass-filled Rilsan grades in lower modulus and lower heat deflection temperature at 1.8 MPa; it is therefore selected for parts where toughness and moisture stability outweigh creep resistance or stiffness.
