| HS Code | 469500 |
| Material Family | Nylon 11 (Polyamide 11) |
| Filler | Unreinforced |
| Density | 1.04 g/cm³ |
| Melting Point | 185 °C |
| Tensile Strength At Yield | 55 MPa |
| Tensile Elongation At Break | 300 % |
| Flexural Modulus | 827 MPa |
| Flexural Strength | 68 MPa |
| Izod Impact Notched At 23c | 100 J/m |
| Heat Deflection Temperature At 1 82 Mpa | 54 °C |
| Water Absorption 24h | 0.4 % |
| Mold Shrinkage | 0.5 % |
As an accredited Ashley Polymers Ashlene L935 Nylon 11 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg multi-wall paper bags with a moisture-proof inner liner, palletized and shrink-wrapped for safe transport. |
| Container Loading (20′ FCL) | 20′ FCL: Ashlyene L935 Nylon 11 pellets packed in sealed bags on pallets, evenly stowed and secured for safe transit. |
| Shipping | Ship Ashlene L935 Nylon 11 as non-hazardous polymer resin in sealed moisture-barrier bags or drums. Keep dry, avoid direct sunlight and high heat. Use covered transport to prevent condensation. No special hazmat placarding required, but secure loads properly and store in cool, ventilated area until use. |
| Storage | Store Ashley Polymers Ashlene L935 Nylon 11 in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and ignition sources. Keep containers tightly closed when not in use to prevent moisture absorption and contamination. Avoid exposure to excessive humidity or temperatures above recommended limits, as these can affect material properties. |
| Shelf Life | Shelf life is typically 2 years when stored in original sealed containers under cool, dry conditions. |
Ashlene L935 Nylon 11 is processed as the polyamide liner in multi-layer fuel transport assemblies where EVOH supplies the hydrocarbon barrier and PA11 contributes low-temperature impact resistance, methanol resistance, and a low moisture-uptake coefficient. If the OEM specification requires electrostatic dissipation, a carbon-black conductive concentrate is introduced at a let-down ratio of 10–15 wt% and the finished inner-layer surface resistivity is targeted below 1 × 10⁶ Ω/sq under dry-air conditions. For an 8.0 mm OD, 1.0 mm wall tube, the layer structure is 0.12 mm PA11 inner layer, 0.06 mm anhydride-modified tie resin, 0.15 mm EVOH barrier, 0.06 mm tie resin, and 0.61 mm outer PA12. Pellets are dehumidified at 85 ± 5 °C for 4 h in a hopper dryer with a desiccant bed and a dew point of −40 °C or lower. Residual moisture must be held below 0.08 wt% because hydrolysis during extrusion reduces amide chain length and lowers the burst strength of the finished pipe. The inner-layer extruder is a 45 mm single-screw machine with an L/D ratio of 30:1, a barrier screw, and a gear pump set between 3.0 kg/h and 5.0 kg/h. Barrel profile is 220/235/240/240/240 °C, and the die is held at 245 °C. Melt pressure at the breaker plate is limited to 20 MPa to prevent shear-induced thermal peaks. Vacuum calibration at −0.08 MPa and 25 °C water fixes the outer diameter while the internal air is balanced to prevent bore collapse. The assembled fuel line is tested against SAE J2260 for evaporative emissions, ISO 1167-1 for hydrostatic pressure at 23 °C and 80 °C, and ASTM D638-14 for tensile yield and elongation. Published burst-pressure data for Ashlene L935 in every SAE J2260 construction are limited; lot-specific qualification on the production coextrusion line is required for each layer sequence.
Unbonded flexible riser qualification under API Spec 17J selects polyamide 11 for the pressure sheath in hydrocarbon production where elevated service temperatures and gas-charged produced fluids create rapid gas decompression conditions. The annular polymer layer is extruded directly over the interlocked steel carcass with a nominal thickness in the range of 3–8 mm, and the thickness is established by collapse-pressure design rather than by fixed rule. A 120 mm single-screw extruder with an L/D ratio of 25:1, water-cooled feed throat, barrier screw, and gear pump is used. Barrel temperatures are set at 230/240/250/255/255 °C from feed to die, and the melt temperature is limited to 255 °C to minimize amide group degradation. Residence time above 250 °C is held below 10 min during start-up and shutdown. Pellets are dried at 80–90 °C for 4 h to a residual moisture below 0.08 wt%. Eccentricity is controlled with a three-point air ring and ultrasonic wall gauges; wall eccentricity is limited to 5% of nominal thickness. Slow air cooling followed by water spray at 40–60 °C promotes the crystalline morphology needed for low gas diffusion and improved blister resistance. Material acceptance for sour hydrocarbon service follows NORSOK M-710 aging in simulated produced fluid followed by rapid gas decompression cycling. The test gas mixture and decompression schedule are specified by the flexible pipe manufacturer and operator; both blistered area and retained elongation are recorded. Published rapid gas decompression data for Ashlene L935 under full API 17J gas mixtures are limited, so qualification is specific to the extruder line, layer thickness, and annulus geometry.
For truck and trailer pneumatic circuits, Ashlene L935 is extruded as monolayer tubing in 6.0 mm, 8.0 mm, and 12.0 mm outside diameters for compressed-air brake and suspension-control lines. The granules are predried at 80 ± 5 °C for 4 h in a vacuum dryer to a final moisture of 0.10 wt% or lower. Extrusion is performed on a 60 mm single-screw extruder with L/D 30:1, a general-purpose nylon screw, and an axial melt mixer. The barrel temperature profile is 210/230/240/240/235 °C from feed to die. The tube is drawn through a vacuum sizing trough operated at −0.09 MPa with water at 22 °C. The draw-down ratio between the die gap and the finished outer diameter is held between 2.0:1 and 2.8:1 to avoid excessive axial orientation that causes coiling recoil and dimensional shrinkage during vehicle service. After sizing, the tubing is annealed at 100 °C for 1 h in a hot-air tunnel to stabilize the crystalline structure. Final product for air brake systems is qualified to SAE J844 for heat resistance and dimensional stability, ISO 7628-1 for burst pressure at 23 °C, and ISO 7628-2 for low-temperature impact at −40 °C. Underbody routing also requires salt-spray exposure per ISO 9227 with 5% NaCl at 35 °C for 240 h. Published burst-pressure data for Ashlene L935 in a specific DIN 73378 configuration are limited; line trials with the target fitting and clamping system are required to establish the final assembly margin.
Polyamide 11 has been specified as a cable inner sheath and mechanical strain-relief layer in railway and wind-turbine cable designs where low moisture uptake and low-temperature flexibility are required. Ashlene L935 is applied to copper or aluminum conductors with a crosshead die in pressure tooling configuration, which forces the melt into the conductor interstices while the conductor is preheated to 70–100 °C. The extruder is a 30:1 L/D single-screw machine with vacuum venting at −0.05 MPa in the melt zone to remove residual volatiles. Melt temperature is 230–250 °C with barrel zones of 220/235/240/240 °C. Wall thickness is set between 0.20 mm and 0.40 mm at line speeds of 80–150 m/min, depending on conductor diameter and payoff tension. A short air gap of 50–100 mm is maintained before a 20 °C water trough to reduce melt draw-down variation. Railway cables are tested under EN 50264-1 for flame spread and smoke density performance of the complete cable construction; Ashlene L935 is used as the inner protective layer when the outer sheath is a flame-retardant LSZH or polyolefin compound. Low-temperature cold-bend performance of the finished cable is evaluated according to EN 60811-505 at −25 °C unless the cable procurement specification sets a lower temperature. The low water absorption of PA11 after 24 h immersion at 23 °C is approximately 0.30 wt% per ISO 62, but the grade is not a replacement for cross-linked polyethylene primary insulation. Published voltage-withstand data for Ashlene L935 as a cable sheath are limited; each manufactured cable design must undergo full type testing.
| Application segment | Governing standard | Critical measured property |
|---|---|---|
| Multilayer fuel pipe liner | SAE J2260 | Evaporative emission, hydrostatic burst at 23 °C and 80 °C |
| Flexible riser pressure sheath | API Spec 17J | Rapid gas decompression resistance, aged retained elongation |
| Truck air brake tubing | SAE J844 | Burst at 23 °C, low-temperature impact at −40 °C |
| Railway cable inner sheath | EN 50264-1 | Cold bend at −25 °C, flame spread of complete cable |
| Fluid coupling and adapter | NSF/ANSI 61 | Extractive limits, hydrostatic pressure cycling |
| Subsea umbilical liner | ISO 13628-5 | Methanol absorption, liner adhesion, mandrel bend at −20 °C |
When Ashlene L935 is selected for quick-connect couplings and flanged adapters in aqueous hydrocarbon service, the molding environment is configured to control weld-line strength and snap-fit dimensional stability. The granules are dried at 85 °C in a closed-loop desiccant dryer to 0.06 wt% moisture before molding because residual moisture above 0.10 wt% produces splay and reduces tensile strength at knit lines. A reciprocating-screw injection molding machine with a 35 mm screw, 20:1 L/D, and a positive check ring is used. Barrel zones are 220/235/245/250 °C from feed to nozzle. Injection velocity is set to 80–120 mm/s with switch-over at 95% filled volume. Holding pressure is 40–60 MPa for 5–8 s, and the mold is regulated with water at 60 °C to avoid a frozen skin that embrittles thin snap-fit beams. For a part with a 0.8 mm snap-fit deflection, adjustment of gate location to the thick section reduces weld-line risk. Parts intended for potable water in the United States require NSF/ANSI 61 Section 4 certification, and EU food-contact articles must comply with EU 10/2011 and its amendment 2020/1245 with total migration below 10 mg/dm². Nylon 11 is also described under FDA 21 CFR 177.1500 for nylon resins in food-contact articles, subject to end-use conditions. Chemical compatibility must be checked for each fluid; continuous contact with strong mineral acids above room temperature and strong oxidizing agents is not recommended because amide hydrolysis and chain scission reduce mechanical integrity. Mold shrinkage for a 2.0 mm thick section is typically 0.8–1.2% in flow direction and 1.1–1.5% transverse, but these values are dependent on gate geometry and packing. Published cycle-time data for Ashlene L935 in a specific hot-runner tool are limited; tooling trials are required.
Subsea hydraulic control and methanol injection lines in steel-tube umbilicals specify PA11 liners when the service fluid contains methanol and the design temperature exceeds the long-term ceiling of less-resistant polyolefins. The liner is extruded inside a duplex or super-duplex stainless steel tube using a wire-coating crosshead with a centering die. Melt temperature for Ashlene L935 is held at 245–255 °C, and the steel tube is preheated to 120–150 °C to promote adhesion without a primer. Liner thickness is 0.20–0.50 mm, and concentricity is controlled to within ±0.05 mm over the tube bore using laser or ultrasonic wall measurement. The lined tube is annealed at 100 °C for 2 h to reduce residual orientation. Qualification for subsea umbilical components follows ISO 13628-5 and API 17E. Hydraulic-fluid compatibility is evaluated by aging in the specified control fluid at the maximum operating temperature, while methanol absorption is measured gravimetrically after immersion at 60 °C for 7 days; acceptance limits are defined by the umbilical purchaser. The PA11 liner must not crack after bending around a mandrel with a radius of 6 times the tube outer diameter at −20 °C. Published comparative methanol-uptake data for Ashlene L935 in this exact configuration are limited; each umbilical manufacturer must qualify liner adhesion and collapse resistance under its own tube bore preparation sequence.
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Ashley Polymers Ashlene L935 Nylon 11 is an unfilled polyamide 11 homopolymer supplied as a medium-viscosity extrusion and injection moulding grade. The material is specified in flexible tubing, pneumatic hose, cable jacketing, fuel-vapour lines, and snap-fit connectors requiring low-temperature ductility and controlled moisture uptake. As a polyamide 11, the repeating unit is derived from 11-aminoundecanoic acid; the lower amide-group density relative to PA6 or PA66 reduces equilibrium water absorption to approximately 1.7–2.2% under ISO 62, while the density is typically 1.03–1.05 g/cm³ under ISO 1183-1. Published grade-specific technical data for Ashlene L935 remains limited; the following property envelope therefore represents unfilled extrusion-grade polyamide 11 homopolymer values measured under the cited methods and should be confirmed against the supplier certificate of analysis for each production batch.
The grade is normally supplied with a moisture content below 0.10% and must be resealed after opening. Conditioning at 23°C and 50% RH before tensile testing produces yield-stress values in the 38–47 MPa range and tensile strain at break above 200% under ISO 527-1/-2. The property set below is representative for unfilled polyamide 11 homopolymer in the Ashlene L935 viscosity class.
| Property | Value | Test method |
|---|---|---|
| Density | 1.03–1.05 g/cm³ | ISO 1183-1 |
| Melt volume-flow rate at 235°C, 2.16 kg | 8–15 cm³/10 min | ISO 1133-1 |
| Tensile stress at yield | 38–47 MPa | ISO 527-1/-2 |
| Tensile strain at break | 200–400% | ISO 527-1/-2 |
| Flexural modulus | 900–1400 MPa | ISO 178 |
| Notched Charpy impact at -30°C | 6–12 kJ/m² | ISO 179-1/1eA |
| Melting temperature | 186–190°C | ISO 11357-3 |
| Water absorption at saturation | 1.7–2.2% | ISO 62 |
| Vicat softening temperature, B50 | 150–170°C | ISO 306 |
Moisture conditioning shifts the notched-impact response because polyamide 11 remains ductile below the glass-transition region of many rigid engineering thermoplastics. At -40°C, unconditioned specimens may still show Charpy values above 6 kJ/m², but dry-as-moulded specimens are preferred for lot-release comparison under ISO 291 because water acts as a plasticizer and can raise elongation while reducing flexural modulus by 10–20%.
Residual moisture above 0.15% at melt temperatures above 230°C promotes hydrolytic chain scission in the extruder barrel. Production-scale single-screw lines running 6–16 mm outside-diameter tubing have exhibited melt-pressure decay of 10–30% at constant screw speed when undried material enters the feed throat. Desiccant drying at 80°C for 4–6 h with a supply dew point of -30°C or lower is standard practice. Trough-bed dryers should not exceed 90°C because extended exposure at high temperature can produce yellowing and viscosity loss at the pellet surface. When plant relative humidity exceeds 60%, a closed-loop vacuum or dry-air hopper loader with dew-point monitoring should be used rather than open hoppers.
Dimensional growth after saturation is an application-critical variable. A 50 mm injection-moulded plaque conditioned under ISO 62 can expand by approximately 1.2% as moisture reaches equilibrium. Tooling for Ashlene L935 components intended for humid service should therefore design running clearances that accommodate swelling of 0.8–1.5%, and prototype parts should be measured after conditioning at 23°C and 50% RH for 48 h before calculating CPK values.
Extrusion of Ashlene L935 on single-screw machines with L/D ratios from 24:1 to 30:1 is typically run with a feed-zone temperature of 210–225°C, a compression-zone temperature of 225–240°C, and a metering-zone temperature of 230–245°C. When the metering-zone melt temperature falls below 220°C, partially unmelted pellets produce surface roughness and intermittent melt-pressure fluctuation of ±5–10 bar. Raising the barrel temperature above 250°C for more than 20 min at low throughput increases residence time and shifts the melt volume-flow rate outside the virgin-grade envelope under ISO 1133-1 through molecular-weight reduction.
Injection moulding of Ashlene L935 uses a melt-temperature range of 230–280°C, a mould-temperature range of 40–80°C, and hold pressure of 40–70 MPa. Clamp-force estimates for multi-cavity tools commonly use 3.5–5.0 kN/cm² of projected area. Mould temperatures below 40°C have been associated with increased post-mould crystallisation and dimensional variability exceeding ±0.4% in unfilled parts. For wall thicknesses near 2.0 mm, cooling time of 15–25 s is typical and gate blush is controlled by maintaining a short flow length from the gate to the last fill point.
Regrind addition above 20% by mass is not recommended for pressure-containing tubing because repeated heat history lowers melt-viscosity retention measured by oscillatory shear below the value required for consistent parison control. On co-rotating twin-screw compounding lines with screw diameters of 25–40 mm, addition of 20% regrind may require a barrel-temperature increase of 3–5°C to maintain die pressure above 50 bar. Die lip build-up has been observed after 6–8 h on corrugated-conduit lines when melt temperature exceeds 245°C with screen packs of 120/80/60 mesh.
Relative to PA12, Ashlene L935 retains a melting temperature approximately 10°C higher, which supports continuous exposure at moderately higher temperatures without entering the crystalline melting region. Relative to PA6, the polyamide 11 chemistry of Ashlene L935 has significantly lower equilibrium moisture uptake and greater retention of dimensional stability in humid service. The table below compares typical unfilled homopolymer values measured under equivalent ISO methods.
| Property | PA11 Ashlene L935 envelope | PA12 | PA6 | Method |
|---|---|---|---|---|
| Density | 1.04 g/cm³ | 1.01 g/cm³ | 1.13 g/cm³ | ISO 1183-1 |
| Melting temperature | 186–190°C | 176–180°C | 220–225°C | ISO 11357-3 |
| Water absorption at saturation | 1.7–2.2% | 1.2–1.6% | 9.5–10.0% | ISO 62 |
| Flexural modulus | 900–1400 MPa | 900–1300 MPa | 2400–3000 MPa | ISO 178 |
| Notched Charpy at 23°C | no break | no break | 5–8 kJ/m² | ISO 179-1/1eA |
The flexural modulus of polyamide 11 is approximately 5–15% higher than that of PA12 at 23°C, while the density remains lower than PA6 and only marginally above PA12. In coiled tubing applications, PA11 can retain lower set-stress than PA6 after repeated flex cycles, which reduces kinking in automated assembly cells. Published head-to-head data for Ashlene L935 against specific commercial PA12 and PA6 grades is limited, and material selection should be validated by application-specific testing rather than general family comparisons.
Extruded Ashlene L935 tubing for pneumatic and fuel-related service is normally evaluated for burst pressure under ISO 1402 and for dimensional stability after thermal ageing under ISO 188. In multi-layer tubing, interlayer adhesion is tested under ISO 8033. A production audit on a single-screw line running 8 mm outside-diameter tube at 30 m/min found that maintaining a draw ratio of 1.2:1 to 1.6:1 and a vacuum calibration gauge of -0.2 bar controlled ovality below 0.05 mm for a 1.0 mm wall. Snap-fit connectors moulded from Ashlene L935 show insertion force of 20–60 N depending on geometry; using a VDI 3400 surface texture of 24–30 on the core reduces demoulding friction without external lubricant.
In offshore cable sheathing and oil-and-gas umbilical sheathing, Ashlene L935 is processed over copper or fibre-optic cores with a wall thickness of 1.5–3.0 mm. The material is generally not recommended for continuous immersion in strong acids or zinc chloride solutions above 60°C without stress-cracking evaluation under ISO 22088. For applications requiring extended exposure to hot air above 120°C, heat-stabilised grades should be considered because unstabilised polyamide 11 can undergo oxidative embrittlement after 500–1,000 h depending on wall thickness and airflow. When Ashlene L935 is used in fuel-vapour service, permeation and extraction testing under SAE J2260 or equivalent OEM specifications is required before production release.
