| HS Code | 594900 |
| Density | 1.16 g/cm³ |
| Melting Point | 183 °C |
| Tensile Strength At Break | 48 MPa |
| Elongation At Break | 8 % |
| Tensile Modulus | 3.3 GPa |
| Flexural Modulus | 3.1 GPa |
| Charpy Impact Strength Notched | 5 kJ/m² |
| Heat Deflection Temperature 1 80 Mpa | 72 °C |
| Vicat Softening Temperature | 92 °C |
| Water Absorption 24h | 1.2 % |
| Mould Shrinkage | 0.6 % |
| Bio Based Content | 57 % |
As an accredited NaturePlast NPW SEA 251 Nylon 11 Biocomposite 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 Nylon 11 biocomposite is packaged to preserve quality and ensure safe handling. |
| Container Loading (20′ FCL) | 20′ FCL shipment of NaturePlast NPW SEA 251 Nylon 11 Biocomposite, loaded securely on pallets, ensuring safe, efficient transport. |
| Shipping | Ship NaturePlast NPW SEA 251 as non-hazardous biocomposite pellets in sealed, moisture-proof packaging. Avoid high heat, humidity, and direct sunlight. Use clean, dry transport containers to prevent contamination. Maintain proper ventilation and secure loads properly. Standard handling precautions apply; no special transport classification required under normal conditions. |
| Storage | Store NaturePlast NPW SEA 251 in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and excessive humidity. Keep the material in its original sealed packaging or in clean, compatible containers to prevent moisture pickup and contamination. Avoid exposure to strong oxidizers and store at temperatures below 25°C for optimal stability. |
| Shelf Life | Shelf life is typically 2 years when stored in original sealed packaging in a cool, dry environment. |
Automotive air brake and fuel vapor tubing produced from NaturePlast NPW SEA 251 Nylon 11 Biocomposite is converted on a single-screw extruder equipped with a grooved feed bushing, an L/D 30:1 barrier screw, and a gear melt pump before the die head. Pre-drying in a desiccant dryer with a dew point of -40 °C at 80 °C for 4 h is required because residual moisture above 0.08 wt% creates surface splay, lowers melt viscosity irregularly, and reduces burst strength after annealing. The barrel profile from feed to die is 200 °C, 220 °C, 235 °C, 240 °C, and 235 °C; melt temperature at the breaker plate is kept between 232 °C and 245 °C. Tube calibration uses a closed-loop vacuum tank at -0.4 bar to -0.7 bar with water at 12 °C to 16 °C, followed by a hot-water tempering bath at 80 °C for 90 s. The extruded tube is tested to ISO 7628:2010 and SAE J844 for dimensional stability, burst strength at 60 °C, low-temperature flexibility, and resistance to zinc chloride stress cracking using a 50% aqueous ZnCl₂ solution at 23 °C for 200 h. The marine biofiller in this grade reduces melt extensibility compared with unfilled PA11; puller speed is typically reduced by 8% to 12% during the first 500 m of production to maintain outside diameter tolerance within ±0.05 mm. No external plasticizer is required for this tube class, which reduces plasticizer migration to the compressed air stream and preserves compliance with heavy truck pneumatic system requirements.
Accelerated aging tests for pneumatic tubing, conducted in circulation ovens at 100 °C for 1,000 h followed by burst testing at 23 °C and 60 °C, isolate the limiting degradation mode. With PA11 biocomposite, the primary loss mechanism is oxidative stabilizer consumption at the inner tube wall, not base resin hydrolysis, because normal service temperatures remain below 60 °C. In truck trailer installations, brass or zinc-plated steel fitting barbs release transition metal ions that catalyse oxidative chain scission when local moisture content exceeds 0.3 wt%. Burst strength retention below 70% after 1,000 h at 100 °C is treated as stabilizer depletion rather than polymer molecular weight loss. If the tube wall thickness drops below 1.0 mm, oxygen diffusion through both surfaces shortens the retention plateau; stabilizer dose must then be verified by differential scanning calorimetry oxidation induction time at 210 °C. Field failure analysis in heavy truck service consistently locates circumferential stress whitening at the fitting barb root, where the barb clamp restricts strain crystallization of the PA11 matrix. The biocomposite filler increases notch sensitivity at this point, so a barb root radius not less than 0.5 mm and a controlled insertion depth are specified. Wet compressed air at 85 °C with condensate pH above 8 should be considered an outside boundary for long-term qualification because alkaline hydrolysis accelerates chain scission in polyamide 11; published data for this specific biocomposite configuration under pH cycling is limited.
| Conversion route | Residual moisture limit | Melt temperature range | Maximum melt residence time | Primary test standard |
|---|---|---|---|---|
| Tube extrusion | <0.08 wt% | 232–245 °C | 8 min | ISO 7628 |
| Injection molding | <0.08 wt% | 235–250 °C | 12 min | ISO 527-2 |
| Monofilament spinning | <0.05 wt% | 240–255 °C | 10 min | ASTM D2256 |
| Fluidised-bed coating | <0.10 wt% | 220–235 °C | 6 min | ISO 6272 |
In unbonded flexible riser carcass liners for sweet crude service at design temperatures not exceeding 60 °C, the PA11 biocomposite is assessed against ISO 23936-1:2022 and API 17B for thermoplastics in oilfield production. The controlling degradation environment is produced water with dissolved CO₂, not dry hydrocarbon, because water molecules hydrolyse the amide linkage when temperature exceeds 60 °C under acidic or alkaline conditions. Qualification coupons are aged in autoclaves at 60 °C and 150 bar in simulated produced water with a pH of 5.5 and a water cut of 50%; tensile elongation retention after 1,000 h is measured with ISO 527-2:2012. Methanol absorption from hydrate inhibition lowers yield strength by plasticization, but the low equilibrium water absorption of PA11, below 0.5 wt% at 23 °C and 50% relative humidity per ISO 62, reduces dimensional swell. The marine filler in NPW SEA 251 may increase surface moisture uptake at the liner bore; this does not change the hydrolysis reaction order, but it can reduce the local modulus before bulk saturation is reached. Sour service with H₂S partial pressure above 0.1 bar combined with free water at temperatures above 80 °C is outside the usual qualification envelope for PA11 liners unless specifically validated. Published data for this exact biocomposite under explosive decompression cycling is limited; a gas decompression test per ISO 23936-1 or NORSOK M-710 is required before use in gas service.
Monofilament conversion is performed on a single-screw extruder with L/D 28:1 to 32:1 and a melt filtration pack rated at 20 µm absolute. The spinneret diameter is selected between 1.0 mm and 1.5 mm; water quench is maintained at 35 °C to 45 °C before oven drawing at a ratio of 3.0:1 to 4.5:1 and a relaxation stage of 5% to 10%. Filler agglomerates larger than 20 µm cause filament breaks during orientation and must be removed by screen pack and melt gear pump. Braid angle is set at 54°44′ relative to the hose axis to balance longitudinal and hoop stress. Braid tension is adjusted to produce a braid cover of 85% to 95%. Hose assemblies built with this monofilament are qualified under SAE 100R7 and ISO 3949, with impulse cycling of 100,000 cycles at 100 °C and a working pressure derived from the braid density. The low equilibrium moisture absorption of PA11 prevents the dimensional instability observed with PA6 reinforcements in humid hydraulic systems; however, the biocomposite monofilament may exhibit a higher bending stiffness than unfilled PA11, which increases the minimum bend radius of the finished hose by approximately 10% and requires a radiused mandrel when crimping couplings. Tensile properties of the oriented monofilament are tested in accordance with ASTM D2256; published data for this specific filled grade under impulse loading is limited, so prototype hose assemblies should be subjected to full qualification rather than interpolating from resin data.
Because PA11 retains less than 0.5 wt% moisture at 23 °C and 50% relative humidity per ISO 62, injection-moulded fuel line clips and snap-fit brackets made from NPW SEA 251 exhibit low hygroscopic dimensional shift after moulding. Pellets are pre-dried at 80 °C for 4 h to 6 h to a residual moisture below 0.08 wt%. The moulding window uses a melt temperature of 235 °C to 250 °C, a mould temperature of 50 °C to 80 °C, and an injection speed of 120 mm/s to 180 mm/s for wall sections between 1.0 mm and 2.5 mm. Holding pressure is set at 60 MPa to 70 MPa hydraulic, with screw back pressure at 0.5 MPa to 1.0 MPa to control filler distribution. Snap-fit retention after heat ageing in automotive under-hood air at 120 °C for 500 h is evaluated with ISO 527-2 tensile modulus and ISO 179-1/1eA notched Charpy impact. The biofiller raises flexural modulus relative to unfilled PA11 but reduces elongation at break; living hinges are not recommended below a thickness of 0.8 mm unless a radius of at least 0.5 mm is maintained. Chemical resistance to engine oil, diesel, and calcium chloride road salt is tested by immersion at 80 °C for 500 h using ISO 175 procedures. Flame performance is UL 94 HB at 1.6 mm; if a V-2 or V-0 classification is required, the specific flame-retardant formulation must be verified because the biofiller does not impart flame retardancy.
If the screw recovery time is longer than 12 min at melt temperatures above 245 °C, the biofiller-matrix interface in NPW SEA 251 begins to show measurable degradation as brown streaking, volatile emission at the vent, and a drop of more than 15% in notched Charpy impact per ISO 179-1/1eA. This condition occurs most often when the shot weight is below 25% of the rated barrel capacity and the non-return valve leaks during plastication. The melt film at the barrel wall is repeatedly heated and sheared; PA11 chain scission proceeds by oxidative degradation at the amide carbonyl, and the mineral filler accelerates melt discoloration once the organic surface treatment decomposes. The corrective protocol replaces the general-purpose screw with a low-compression screw of L/D 20:1, uses a shut-off nozzle instead of an open nozzle, and lowers the rear zone to 190 °C to reduce pre-melting of feed. Melt temperature is monitored by an immersion probe at the nozzle; excursions above 255 °C require a screw speed reduction. Hot runner gate tips are set to 245 °C maximum, and valve gate needle hold time is limited to 5 s. When these conditions cannot be met because of part volume, the material should be processed only in a separate drying and conveying system with a hopper residence time below 30 min at 80 °C to prevent oxidation before plastication.
A fluidised-bed coating line operating with a negative electrostatic voltage of 60 kV to 100 kV is suitable for wire goods, battery tray brackets, and handrail fittings where PA11 coatings replace solvent-based coatings. Powder of NPW SEA 251 is sieved to a particle size distribution of 80 µm to 250 µm and pre-dried to moisture below 0.10 wt% before charging. Metal parts are preheated to 260 °C to 280 °C, immersed in the fluidised bed for 5 s to 10 s, and post-heated at 220 °C for 3 min to coalesce the melt. Coating thickness is controlled between 300 µm and 500 µm; adhesion is checked by cross-cut pull-off per ISO 2409 and impact resistance by ISO 6272. The biofiller raises the melt viscosity at coalescence, so a slightly higher post-heat temperature or longer flow time is needed compared with unfilled PA11 powder; the exact adjustment is set by surface gloss threshold. Fluidised-bed humidity should be held below 30% relative humidity to prevent filler agglomeration and uneven deposition. Salt spray performance for coastal installations is evaluated by ISO 9227 for 720 h; scribe creep should not exceed 3 mm on zinc-phosphated steel. The coating process is not recommended for aluminium substrates without anodizing or chromate-free conversion because adhesion loss occurs within thermal cycling.
| Application | Primary standard | Secondary test method | Critical condition |
|---|---|---|---|
| Air brake tubing | ISO 7628:2010 | SAE J844 | 50% ZnCl₂, 200 h |
| Hydraulic hose braid | SAE 100R7 | ISO 3949 | 100,000 cycles at 100 °C |
| Flexible riser liner | ISO 23936-1:2022 | API 17B | 60 °C, 150 bar, 1,000 h |
| Injection-moulded clip | ISO 527-2:2012 | ISO 179-1/1eA | 120 °C, 500 h |
| Fluidised-bed coating | ISO 6272 | ISO 2409 | Reverse impact at 5 J |
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NaturePlast NPW SEA 251 Nylon 11 Biocomposite is a polyamide 11 matrix grade within the NaturePlast NPW biocomposite range, supplied as ready-to-process granules for injection molding and extrusion. The base polymer is synthesized from castor oil–derived 11-aminoundecanoic acid, and the compound contains renewable lignocellulosic filler or natural fiber reinforcement. Publicly available data for this specific grade does not fully disclose filler type, fiber length distribution, or loading; therefore, the following sections distinguish matrix-level polyamide 11 data from the wider industrial envelope for natural-fiber PA11 compounds. Lot-specific ISO 1043 designation, density by ISO 1183, and melt volume-flow rate by ISO 1133-1 should be requested from the supplier before tooling release.
Under ISO 1043-1, polyamide 11 is designated PA11. The renewable carbon fraction of castor-derived PA11 is routinely measured above 98% by ASTM D6866 carbon-14 analysis on the unfilled resin. In a biocomposite, total renewable carbon is diluted by mineral nucleants, transport aids, or synthetic coupling agents. A differential scanning calorimetry scan per ISO 11357-3 normally locates the PA11 melt endotherm between 185°C and 190°C. Density for natural-fiber PA11 compounds measured following ISO 1183 commonly falls between 1.06 g/cm³ and 1.15 g/cm³; the exact value is controlled by filler volume fraction and void content from incomplete wetting. Melt volume-flow rate under ISO 1133-1 is not a linear function of filler loading because natural fibers break under shear and release moisture, so a compound-specific value for NPW SEA 251 is not reproduced here. The matrix moisture absorption at equilibrium in water at 23°C is approximately 1.8–1.9% by ISO 62, lower than the 9.0–9.5% range for PA6 and the 8.5% value commonly cited for PA66.
The primary process boundary is the narrow interval between the minimum plastication temperature of PA11 and the onset of thermal decomposition of natural reinforcement. Lignocellulosic filler discolors and generates acetic acid, water, and odor compounds once melt temperature exceeds 200°C–220°C; the PA11 phase must remain above 185°C for complete melting. On production-scale injection molding machines, the nozzle melt temperature is therefore controlled to 190°C–200°C, corresponding to a tolerance near ±5°C. Flat temperature profiles are preferred over rising profiles to prevent local residence-time damage.
Compounding on co-rotating twin-screw extruders with L/D 32:1–40:1 uses feed zones at 160°C–180°C, kneading sections at 185°C–195°C, and die zones at 195°C–200°C. Screw designs with low shear kneading blocks and atmospheric venting reduce fiber attrition and volatile accumulation. Vent plugging from fiber fines or condensed organic acids is an observed production failure when the die throat runs hot or when vacuum is not applied after fiber addition. Specific mechanical energy should be monitored; high screw speed raises melt temperature above the degradation boundary and produces black specks.
Moisture control is equally critical. Natural fiber absorbs water more rapidly than the PA11 matrix. A desiccant dryer maintained at a dew point of −40°C or lower with air temperature at 80°C for 4–6 h is required to reach below 0.10% residual moisture. If shop-floor relative humidity exceeds 60%, open granule exposure should be shorter than 30 min before sealed hopper loading. Wet granulate produces splay, screw slip, shot-weight drift, and hydrolysis of amide linkages; molded parts show reduced tensile strength and increased melt flow variability. Dryer hopper residence times above 8 h at temperature are avoided because natural fiber may embrittle or darken.
Natural-fiber PA11 compounds exhibit rapid skin solidification and anisotropic fiber orientation. Sprue, edge, and fan gates of 1.5–2.5 mm thickness are used for wall sections between 2.0 mm and 4.0 mm. Pin gates below 1.0 mm create excessive shear heating and can degrade filler at the gate entrance. Hot-runner drops with long melt residence time are generally avoided, whereas externally heated manifolds with short nozzle tips are acceptable if temperature is held at or below 200°C. Injection speed is set to fill the cavity before freeze-off but not high enough to generate burn marks from trapped volatiles.
Mold temperature is maintained between 40°C and 80°C. At 40°C, cycle time improves but post-mold warpage increases because of orientation gradients. At 80°C, crystallinity develops more fully, improving surface hardness and reducing internal stress, but cycle time lengthens. Mold shrinkage measured by ISO 294-4 is anisotropic: 0.4–0.8% parallel to flow and 0.7–1.2% transverse. Unfilled PA11 typically displays 1.0–1.4% shrinkage. Shrinkage after water uptake can offset part of the thermal shrinkage; conditioned parts may swell 0.2–0.5% depending on fiber loading and humidity.
Clamp force for natural-fiber PA11 is generally lower than glass-filled PA6 compounds of similar modulus because lower melt density and filler abrasion reduce effective packing pressure. Mold-filling simulation that includes fiber orientation tensors is recommended for projected areas above 200 cm². Vent depth at the parting line is kept between 0.01 mm and 0.02 mm to release water vapor and volatile degradation products without flash formation.
Mechanical response in NPW SEA 251 should be bracketed against the natural-fiber PA11 class unless lot-specific certification is available. Tensile modulus measured under ISO 527-2 generally shifts from 1.2–1.5 GPa for neat PA11 to 2.5–4.0 GPa for moderate natural-fiber loadings. Tensile strength may remain within 45–70 MPa depending on fiber aspect ratio and coupling efficiency. Notched Charpy impact under ISO 179-1/1eA often declines relative to neat PA11, with low mold temperature producing the greatest notch sensitivity. Heat deflection temperature by ISO 75-2 method B is typically 90–140°C after conditioning, but fiber content, residual moisture, and mold temperature shift the value. Flexural modulus under ISO 178 follows a similar stiffening trend; published data for NPW SEA 251-specific fiber loading is limited, so these values are industrial reference boundaries, not supplier guarantees.
Comparative property envelope for the compound class and reference polyamides:
| Property | Test standard | Natural-fiber PA11 biocomposite | Neat PA11 | PA12 | PA6 |
|---|---|---|---|---|---|
| Density | ISO 1183 | 1.06–1.15 g/cm³ | 1.03–1.05 g/cm³ | 1.01–1.03 g/cm³ | 1.13–1.14 g/cm³ |
| Tensile modulus | ISO 527-2 | 2.5–4.0 GPa | 1.2–1.5 GPa | 1.1–1.4 GPa | 2.8–3.3 GPa |
| Notched Charpy impact | ISO 179-1/1eA | 4–8 kJ/m² | 5–15 kJ/m² | 5–10 kJ/m² | 5–8 kJ/m² |
| Water absorption at saturation | ISO 62 | 2.5–4.5% | 1.8–1.9% | 1.4–1.6% | 9.0–9.5% |
| Bio-based carbon | ASTM D6866 | >80% compound dependent | >98% resin | ~0% | ~0% |
Natural-fiber PA11 compounds often exhibit lower abrasiveness to mold steels than glass-filled materials. In sliding wear, fiber pull-out is the dominant wear mechanism; surface roughness can stabilize after break-in. Tribological data measured under ASTM G133 or ISO 20808 must be obtained for the specific filler system because published data for NPW SEA 251 is limited. Acoustic damping and tactile warmth are frequently cited in natural-fiber polymer literature, but quantitative sound-transmission loss or loss-factor data per ISO 6721 is not available for this exact grade. These properties should be considered secondary selection criteria, not primary engineering specifications unless confirmed by direct measurement.
The PA11 matrix is a thermoplastic, but natural fiber fillers may limit mechanical recycling. If regrind is used, addition rates above 20% often reduce impact and increase moisture uptake; each regrind pass shortens fiber length. Closed-loop regrind ratios should be validated at the intended service temperature and conditioning state. Composting claims for PA11 biocomposites are not automatic; PA11 is not hydrolytically degradable under typical home compost conditions. Industrial biodegradation standards such as ISO 14855 or ASTM D6400 apply only to compostable polymer formulations, which PA11 is not. Disposal must follow local polymer waste streams unless supplier documentation explicitly states otherwise.
PA12 is frequently selected for low water absorption, low-temperature impact resistance, and easy processing. NPW SEA 251 can occupy a renewable-carbon position in this application envelope when the added natural fiber stiffness is acceptable. Compared with PA12, the PA11 matrix provides similar moisture resistance and a higher renewable carbon content, while natural fiber reinforcement raises tensile modulus but reduces Charpy impact. Dimensional stability in humid air is therefore governed by two opposing effects: lower matrix uptake and additional fiber-matrix interfacial sorption. Snap-fit closure, bearing journals, and seal counterfaces should be validated at the upper end-use relative humidity and after 72 h water exposure by ISO 62 or ISO 1110 accelerated conditioning.
Potential application areas for this grade include pneumatic tubing, cable ties, orthotic shells, sports equipment housings, and interior mobility clips. In fluid handling, PA11 resists aliphatic hydrocarbons, lubricants, and automotive fuels. Strong acids, oxidizing agents, and prolonged boiling water attack the amide backbone; the biocomposite is not suitable for continuous hydrolysis environments above 80°C. Additives containing amine functionality should be avoided in masterbatch or colorant selection because they can alter melt stability and accelerate polymer degradation at processing temperatures.
Compared with mineral-filled PLA compounds, PA11-based NPW SEA 251 has higher ductility and superior hydrolysis resistance, but its processing temperature is higher and its stiffness may be lower than high-filler PLA grades. Compared with glass-filled PA6, the natural-fiber PA11 compound reduces density and fossil carbon while offering lower water absorption; however, PA6 glass-filled grades generally provide higher heat deflection and better fiber–matrix adhesion when tested under identical ASTM/ISO conditions.
Compliance claims for NPW SEA 251 require current supplier declarations. The matrix class and filler system are typically evaluated under the following instrument and regulatory assignments:
| Area | Reference | Typical test or condition for polyamide biocomposites |
|---|---|---|
| Renewable carbon content | ASTM D6866 | Carbon-14 measurement; supplier lot report recommended |
| Mechanical conditioning | ISO 291 | 23°C, 50% RH before ISO 527-2 testing |
| Density | ISO 1183 | Water displacement or gas pycnometry |
| Water absorption | ISO 62 | Equilibrium at 23°C |
| Flammability | UL 94 | HB or V classification depending on thickness |
| Substances | REACH, RoHS | Supplier documentation for SVHC and restricted substances |
Lot-to-lot variation in natural-fiber moisture content, fiber length, and particle size can shift melt viscosity and molded part weight. Injection molders should run a single-lot trial with hopper moisture logging, barrel profile recording, and vent pressure monitoring. Comparison with the incumbent PA12 or PA6 grade must be made using the same ISO conditioning protocol; published data for NPW SEA 251-specific configurations is limited, and supplier lot certification is mandatory before production release.
