| HS Code | 640404 |
| Density | 1.02 g/cm³ |
| Water Absorption At Saturation | 1.9 % |
| Melting Point | 189 °C |
| Glass Transition Temperature | 55 °C |
| Tensile Strength At Yield | 45 MPa |
| Elongation At Break | 300 % |
| Tensile Modulus | 1200 MPa |
| Flexural Modulus | 1200 MPa |
| Izod Impact Notched 23 C | 6 kJ/m² |
| Charpy Impact Notched 23 C | 7 kJ/m² |
| Heat Deflection Temperature 0 45 Mpa | 150 °C |
| Heat Deflection Temperature 1 80 Mpa | 55 °C |
As an accredited GEHR Plastics ECOGEHR PA 11 Nylon 11 Dry factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | GEHR Plastics ECOGEHR PA 11 Nylon 11 Dry is supplied in sealed, moisture-proof 25 kg bags to maintain dryness. |
| Container Loading (20′ FCL) | 20′ FCL container loading of GEHR Plastics ECOGEHR PA 11 Nylon 11 Dry, bio-based polyamide resin in dry form, securely packed. |
| Shipping | GEHR Plastics ECOGEHR PA 11 Nylon 11 Dry ships as a non-hazardous, moisture-sensitive resin. Keep sealed in original packaging to prevent moisture absorption. Store in a cool, dry area away from direct sunlight. Protect from physical damage during transit. No special hazardous material documentation required for standard freight. |
| Storage | Store ECOGEHR PA 11 Nylon 11 Dry in its original, sealed container in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and moisture. Keep the packaging tightly closed to prevent humidity absorption. Ideal storage temperature is below 50°C. Avoid exposure to oxidizing agents and strong acids. Proper handling maintains low moisture content and processability. |
| Shelf Life | Store in original sealed container in a cool, dry place; shelf life is indefinite when protected from moisture and heat. |
In coextruded automotive fuel vapor management, GEHR Plastics ECOGEHR PA 11 Nylon 11 Dry is processed as a low-moisture polyamide component where low fuel permeation and cold-crash impact resistance are required. The resin is dried to <0.10 wt% residual moisture at 80 °C in a desiccant dryer with -40 °C dew point for 4 h before feeding single-screw or coextrusion lines. In monolayer constructions, the compound is charged at 100 wt% PA 11 plus 2–3 wt% carbon black masterbatch for ultraviolet and weathering resistance; in multilayer SAE J2260 fuel vapor lines, the PA 11 barrier layer occupies 15–25% of total wall thickness, typically 0.15–0.25 mm within a 1.0–1.5 mm tube wall. The downstream process uses a spiral mandrel die with 225–245 °C melt temperature, a 24:1 L/D single-screw extruder, vacuum calibration at 0.08–0.10 MPa, and line speeds of 12–25 m/min. Barrier layer concentricity is controlled by ultrasonic wall gauging to ±0.03 mm to prevent localized permeation spikes. Compliance is anchored to SAE J2260 for nonmetallic fuel system tubing, SAE J2044 for quick-connect coupling performance, and ISO 19013-2:2019 where gasoline fuel circuit exposure is specified. Terminal product types include fuel feed and return lines, evaporative emission purge lines, and quick connectors. Production-line failure commonly appears as melt pressure oscillation above ±0.15 MPa when barrier-layer viscosity diverges from the tie layer, producing interfacial waviness and intermittent thin spots that compromise permeation performance.
When a dynamic unbonded riser is designed for hydrocarbon transport, the PA 11 pressure sheath is extruded directly over the interlocked steel carcass to provide the primary fluid barrier inside the flexible pipe. Qualification is governed by API Spec 17J:2014, ISO 13628-2:2006, and API RP 17B:2014. For pressure sheath compounds based on PA 11, downstream compounders blend plasticized PA 11 at 86–90 wt%, plasticizer at 10–14 wt%, antioxidant package at 0.3–0.5 wt%, and carbon black at 1–2 wt% where weathering resistance during storage is required. Extrusion is conducted on a 60–90 mm single-screw extruder with L/D ≥ 28:1, melt temperature 215–235 °C, output 150–400 kg/h, and sheath thickness 3–10 mm depending on internal diameter and design pressure. Vacuum calibration after the die maintains ±0.2 mm wall tolerance; residual moisture is held below 0.08 wt% because hydrolytic degradation at these wall sections creates blisters and density discontinuities detectable by ultrasonic scanning. The terminal product range includes unbonded flexible risers, flowlines, and jumpers for subsea production. The operational boundary is severe: plasticizer migration kinetics in aromatic condensate are concentration-dependent, and low-temperature flexibility can shift after extraction. Long-term ageing in simulated produced fluids containing CO2 and H2S must therefore be completed before maximum design temperature is fixed for a particular field.
Historically, low-pressure gas distribution service lines have been extruded from PA 11 because of its resistance to aromatic hydrocarbons, mercaptans, and soil-borne stress cracking. Pipe compounds in this sector use PA 11 at 100 wt% base resin with 2–2.5 wt% carbon black masterbatch and 0.2–0.4 wt% thermal stabilizer, meeting pipe material requirements of ISO 16486-1:2020 and ISO 16486-2:2020. The extrusion line is configured with a grooved feed section, 45–75 mm screw diameter, 24–30:1 L/D, melt temperature 220–245 °C, and vacuum sizing at 0.08 MPa; cooling water is controlled to 40–60 °C to reduce frozen-in stress. SDR 11 pipe for 20–63 mm OD requires wall thickness tolerance of ±0.1 mm measured by ultrasonic scanning; butt fusion joining is performed at 230–240 °C with interfacial pressure derived from the pipe manufacturer’s fusion tables. Terminal product types are buried gas service lines, distribution laterals, and transition fittings. The dry state of the incoming polymer prevents hydrolytic degradation during barrel residence and keeps melt flow stability within ±5% of the lot average, which is critical for maintaining wall thickness without adjusting screw speed.
| Conversion route | Typical PA 11 loading | Residual moisture target | Melt or flash temperature | Critical process variable |
|---|---|---|---|---|
| Multilayer fuel vapor lines | 15–25 wt% of wall thickness | <0.10 wt% | 225–245 °C | Barrier layer concentricity ±0.03 mm |
| Subsea pressure sheath | 86–90 wt% plasticized compound | <0.08 wt% | 215–235 °C | Wall tolerance ±0.2 mm |
| Gas distribution pipe | 100 wt% base resin | <0.10 wt% | 220–245 °C | Wall thickness tolerance ±0.1 mm |
| Commercial vehicle pneumatic tubing | 100 wt% base resin | <0.10 wt% | 220–240 °C | Ovality below 0.1 mm |
| Medical catheter microextrusion | 80–100 wt% PA 11 with 20–30 wt% BaSO₄ | <0.10 wt% | 225–245 °C | Draw-down ratio 2:1–4:1 |
| Electrostatic powder coating | 100 wt% PA 11 powder | <0.10 wt% before grinding | 220–250 °C | Film thickness 250–350 µm |
Truck air brake tubing produced from dry PA 11 is typically run on small-bore extrusion lines producing 4–16 mm OD with 1.0–1.5 mm wall thickness. Formulation is 100 wt% PA 11 optionally containing 2–3 wt% carbon black masterbatch to suppress photo-oxidation; no plasticizer is used where stiffness stabilization at -40 °C is specified. Compliance is verified by SAE J844 and ISO 7628-1:2010 for thermoplastic air brake tubing, including cold impact and burst pressure tests after oil and zinc chloride exposure. Extrusion uses 220–240 °C melt temperature, 0.07 MPa vacuum calibration, and line speeds of 30–80 m/min, with ovality held below 0.1 mm across the coil. Terminal products include truck air brake lines, clutch servo tubing, and suspension bellows supply lines. A known production failure is diameter fluctuation when melt pressure deviates more than ±0.10 MPa; this is corrected by stabilizing barrel zone temperatures and using 24:1 L/D screws with mixing pins to homogenize melt temperature before the die.
Because thin-wall catheter shafts require constant melt strength and low post-sterilization dimensional change, dry PA 11 is processed at 100 wt% neat resin or compounded in-house with 20–30 wt% barium sulfate for radiopacity. In-house radiopaque compounding uses a 25–40 mm twin-screw extruder at 230–245 °C with side-fed barium sulfate to limit barrel wear. Biological evaluation is performed against ISO 10993-1:2018, extraction and in vivo tests per USP <88>, and manufacturing quality systems per ISO 13485:2016. Microextrusion equipment runs 0.5–2.0 mm OD and 0.05–0.15 mm wall thickness, using 225–245 °C melt temperature, draw-down ratios of 2:1–4:1, and cooling water at 20–40 °C. Terminal device types include introducer sheath shafts, catheter body segments, and laparoscopic instrument sleeves. The operational boundary is that barium sulfate reduces tensile elongation and increases flexural modulus, so kink-resistance testing and tensile testing per ISO 527-2 must be repeated after compounding. Published data for the exact ECOGEHR dry PA 11 grade in chronically implanted devices is limited, so each finished device must undergo material-specific biological evaluation rather than relying on nominal polyamide 11 certifications.
Additive manufacturing users processing dry PA 11 filament remove moisture below 0.10 wt% at 80 °C for 4–5 h before printing to prevent interlayer voids and outgassing. The filament is processed at nozzle temperature 250–270 °C, bed temperature 60–80 °C, chamber air temperature 40–50 °C, and nominal layer height 0.1–0.25 mm with a 0.4 mm nozzle. Formulation is 100 wt% PA 11 with 0.1–0.3 wt% heat stabilizer, and no filler unless a composite variant is specified. Relevant compliance includes REACH Regulation (EC) No 1907/2006, RoHS Directive 2011/65/EU, and process terminology under ISO/ASTM 52921:2013. Downstream production uses direct-drive extruders with hardened steel nozzles where filled grades are used, retraction distance 0.5–1.5 mm, and print speeds 30–60 mm/s. Terminal part types include short-run functional fixtures, assembly jigs, and non-implant automotive fluid-contact prototypes. A limitation is that injection-molded mechanical data from ISO 527-2 do not transfer directly to fused filament fabrication parts because interlayer adhesion and raster orientation dominate; tensile strength of printed parts may be 40–60% lower than molded values in the Z-axis.
Primed steel surfaces receive electrostatic or fluidized-bed-applied PA 11 powder where hydrocarbon immersion, impact resistance, and absence of voids are required. The powder is ground to 80–120 µm median particle size from PA 11 base resin; the dry powder contains 100 wt% PA 11 with 0.5–1.0 wt% leveling and antioxidant additives. The metal substrate is grit-blasted to Sa 2.5 per ISO 8501-1, primed with a thermosetting adhesive layer at 5–15 µm, and heated to 220–250 °C for 2–5 min to fuse the polymer into a continuous film of 250–350 µm. Thickness measurement uses ISO 2178 or ISO 2360; adhesion is evaluated by ASTM D3359-17 tape pull, and pinhole detection uses a 3 kV holiday tester. Terminal product types include valve bodies, pump housings, dishwasher baskets, and offshore platform structural fittings. The process window is narrow: film thickness below 200 µm increases pinhole risk, while thickness above 400 µm can produce edge cracking under thermal cycling.
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GEHR Plastics ECOGEHR PA 11 Nylon 11 Dry is supplied as a bio-based semi-crystalline polyamide 11 stock shape in rod, plate, and tubular geometries. The product model designation includes the “Dry” suffix, which identifies a moisture-controlled machining condition rather than a separate polymer composition. Under ISO 1043-1, the material is classified as PA11, synthesized from 11-aminoundecanoic acid derived from castor oil. The dry state is specified with an as-supplied water content below 0.20% by weight when measured by Karl Fischer titration according to ISO 15512. Published representative values for natural PA11 stock shapes place density at 1.03–1.05 g/cm³ under ISO 1183-1, tensile yield strength at 40–50 MPa under ISO 527-1/-2, flexural modulus at 1000–1400 MPa under ISO 178, and Charpy notched impact strength at 5–9 kJ/m² under ISO 179-1/1eA in the dry test condition. These values are reference bands only; lot-specific certificates must be consulted because cooling rate, orientation, and moisture history affect short-term mechanical response.
The dry condition controls initial moisture content, not base melt chemistry. Absorbed water acts as a plasticizer in aliphatic polyamides, lowering glass transition temperature and tensile strength while increasing elongation and notched impact. A dry-state water content below 0.20% by weight therefore produces a harder, stiffer machining response and reduces the tendency to gum tool edges. At saturation in 23°C water, PA11 absorbs approximately 1.6–2.5% by weight under ISO 62, compared with 8.0–10.0% for PA6 and 1.4–2.0% for PA12. The lower equilibrium moisture uptake means that a component machined from PA11 Dry will undergo less dimensional expansion in humid service than a PA6 component of equivalent envelope.
For close-tolerance machining, stock exposed to ambient humidity should be pre-dried at 80–90°C for 4–8 h when dry-state dimensions are specified. Thick sections above 50 mm require longer drying because moisture removal is diffusion-limited. Published data for this specific grade’s diffusion coefficient in plate form is limited; moisture content should be verified by ISO 15512 or ISO 760 before final dimensioning. The dry state is not permanent once the vapor barrier is opened. In humid air, surface moisture content approaches equilibrium before the core, creating a moisture gradient that can alter bore roundness and residual stress distribution.
Because unsealed PA11 Dry surfaces regain moisture in humid ambient air, storage and queue-time control are process variables. At relative humidity above 60% and 23°C, surface moisture uptake within 24–48 h can change machined surface appearance and post-machining dimensions. Opened packages should be returned to sealed moisture-barrier packaging with desiccant during extended queues. If water content rises above 0.25% by weight, published dry-state mechanical values no longer apply, and the stock should be re-dried before final dimensioning.
Stock shape production for PA11 is carried out by screw extrusion or compression molding under controlled melt-temperature conditions that must remain below thermal degradation thresholds. Published processing literature for PA11 extrusion commonly places melt temperatures between 220°C and 250°C. Higher temperatures accelerate thermo-oxidative chain scission, reduce melt viscosity stability, and can lower impact resistance in finished stock. Vacuum venting on extruders with L/D ratios of 30–40 removes dissolved water and residual monomer; without adequate venting, hydrolytic degradation increases porosity in thick sections. The dry condition is preserved downstream by cooling, cutting, and immediate packaging in moisture-barrier film. Reclaimed PA11 that has absorbed ambient moisture should be dried to 0.10% by weight or lower before re-introduction to avoid viscosity loss and bubble formation in the melt.
Between -40°C and 60°C, unfilled PA11 stock shapes typically exhibit coefficient of linear thermal expansion values in the range 100–150 × 10⁻⁶ K⁻¹. This is higher than most metals and influences press-fit, bearing clearance, and thread engagement calculations. Press fits designed for steel hubs or aluminum shafts cannot be transferred directly to PA11 Dry without recalculation because thermal expansion reduces retention at elevated temperature and increases stress at low temperature. The dry state provides a known initial moisture condition, but it does not eliminate thermal expansion.
Turning and milling ECOGEHR PA 11 Dry on CNC lathes and 3-axis machining centers with carbide insert tooling generates continuous chips when tool rake and feed are within suitable ranges. Published plastics machining guides for semi-crystalline nylon stock shapes recommend surface speeds of 150–300 m/min for carbide turning, feed rates of 0.1–0.4 mm/rev for roughing, and depths of cut of 0.5–3.0 mm. These parameters are process starting points, not product-specific guarantees. Excessive local heat above the PA11 melting onset near 180–190°C initiates chip welding, surface smear, and loss of edge definition. Compressed air cooling or dry machining is preferred when the dry condition must be preserved because water-miscible coolants can cause localized moisture uptake and swelling in the machined surface. On production-scale equipment, the main failure modes observed are bore closure after finishing due to heat soak and subsequent moisture regain, and chip wrap on long-chipping PA11 when feed rates are too low. Increasing feed within the recommended range shortens chips and reduces heat input per cut.
Selection of ECOGEHR PA 11 Dry over PA6 or PA12 is governed by moisture absorption, density, and stiffness differences rather than by a single property. Relative to PA6, PA11 reduces maximum water absorption by approximately 70–80%, which lowers dimensional change in humid service and improves dielectric stability. Relative to PA12, PA11 typically offers higher flexural modulus and a higher melting peak near 186–190°C under ISO 11357-3. The lower density of PA11 compared with PA6 reduces rotating mass in gears, plugs, and valve spindles. However, dry PA11 has lower strength and stiffness than dry PA6, so direct substitution requires recalculation of deflection, thread strength, and press-fit retention using ISO 178 flexural modulus rather than historical PA6 values.
| Property | Test method | ECOGEHR PA11 Dry | PA6 dry stock | PA12 dry stock |
|---|---|---|---|---|
| Density | ISO 1183-1 | 1.03–1.05 g/cm³ | 1.13–1.15 g/cm³ | 1.01–1.03 g/cm³ |
| Water absorption at saturation | ISO 62, 23°C | 1.6–2.5% | 8.0–10.0% | 1.4–2.0% |
| Tensile yield strength, dry | ISO 527-1/-2 | 40–50 MPa | 75–85 MPa | 40–50 MPa |
| Flexural modulus, dry | ISO 178 | 1000–1400 MPa | 2700–3000 MPa | 1000–1500 MPa |
| Melting peak | ISO 11357-3 | 186–190°C | 220–225°C | 175–180°C |
The tabulated ranges represent published dry-state bands for natural stock shapes and not guaranteed lot values. PA11 Dry can be distinguished from PA12 in applications where the higher melting peak reduces thermal deformation under short-term exposure to engine or under-hood air, but PA11 is not a high-temperature polymer. Continuous service under load is bounded by heat deflection temperature under ISO 75, thermo-oxidative aging, and wall-thickness-dependent moisture diffusion rather than by the melting peak alone.
Compared with polyoxymethylene copolymer stock shapes, PA11 Dry has lower stiffness and hardness but retains more low-temperature ductility in many published datasets. Dry-state Charpy notched values of 5–9 kJ/m² for PA11 under ISO 179-1/1eA compare with typical POM copolymer values of 6–8 kJ/m² at 23°C, but PA11 often maintains higher impact resistance at -40°C. POM provides lower moisture absorption and more predictable dimensional behavior in humid air, but its resistance to strong bases is limited. The selection boundary is therefore application-specific: if the part must survive dry low-temperature impact and intermittent fuel contact, PA11 Dry is considered; if maximum stiffness and hardness are required with minimal moisture response, POM remains the reference.
The dry condition does not alter the chemical resistance profile of polyamide 11. ECOGEHR PA 11 Dry exhibits resistance to aliphatic hydrocarbons, mineral oils, greases, diesel, biodiesel blends, and many hydraulic fluids under ambient and moderately elevated temperatures, consistent with general PA11 behavior in ASTM D543 or ISO 175 immersion testing. Strong mineral acids, phenols, chlorinated solvents, and concentrated formic acid attack the amide linkage and are contraindicated. Hydrolysis accelerates in hot water and steam above 80°C; long-term exposure to aqueous glycol solutions at elevated temperature can cause environmental stress cracking. In fuel-contact components such as pump spacers, cable conduits, and small valve seats, PA11 is selected when low moisture uptake and biodiesel resistance are required, but service performance depends on wall thickness, temperature, and fuel composition. Published data for this specific configuration is limited when fuel blends contain high aromatic content or peroxide additives.
For food-contact and drinking-water applications, suitability must be confirmed against the exact stock shape formulation and colorant. Polyamide 11 homopolymer may fall under FDA 21 CFR 177.1500 and EU Regulation 10/2011, but compliance depends on migration testing of the finished part and any machining aids or coolants used. RoHS compliance is referenced to 2011/65/EU and REACH to Regulation (EC) No 1907/2006. Lot-specific certificates of conformance should be requested because stock shape lots may vary in additives such as thermal stabilizers or processing lubricants.
