| HS Code | 482116 |
| Density | 1.04 g/cm³ |
| Tensile Strength | 60 MPa |
| Elongation At Break | 280% |
| Flexural Modulus | 1200 MPa |
| Notched Izod Impact | 90 J/m |
| Melting Point | 190 °C |
| Heat Deflection Temperature 1 8 Mpa | 55 °C |
| Vicat Softening Temperature | 170 °C |
| Water Absorption 24 H | 0.3% |
| Rockwell Hardness | R110 |
| Mold Shrinkage | 1.1% |
| Volume Resistivity | 10^13 Ω·cm |
| Dielectric Strength | 16 kV/mm |
As an accredited Ashley Polymers Ashlene T940H Nylon 11 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Ashlene T940H Nylon 11 is supplied as pellets in 25 kg multi-wall paper bags with polyethylene liners, ensuring moisture protection and safe handling. |
| Container Loading (20′ FCL) | 20′ FCL: palletized, moisture-protected bags of Ashlene T940H Nylon 11, securely braced, ventilated, and protected from heat and contamination. |
| Shipping | Ashlene T940H Nylon 11 ships as dry resin pellets in sealed moisture-barrier bags or fiber drums. It is non-hazardous and not regulated by DOT/IMDG for ground or ocean transport. Keep containers sealed, protect from humidity, heat, and UV exposure. Store in a cool, dry area and transport in clean, covered vehicles to avoid contamination. |
| Storage | Store Ashlene T940H Nylon 11 in its original, sealed container in a cool, dry, well-ventilated area away from direct sunlight and heat sources. Keep the container tightly closed when not in use to prevent moisture absorption, which can degrade the polymer. Avoid extreme temperatures and humidity; maintain ambient conditions for optimal stability. |
| Shelf Life | Shelf life is indefinite if stored sealed, dry, and away from heat/UV; moisture absorption may affect processing. |
In heavy-duty vehicle air brake circuits, the substitution of PA12 with Ashley Polymers Ashlene T940H Nylon 11 is evaluated through sustained exposure to chloride-based deicing brines, which produce zinc chloride and calcium chloride solutions that plasticize and stress-crack polyamide grades having higher amide densities. The equilibrium water uptake of nylon 11 measured by ISO 62 immersion at 23 °C lies between 1.6 wt% and 1.9 wt%, whereas PA6 and PA66 absorb above 9 wt%; this difference controls dimensional growth, fitting retention, and cold-temperature impact after years of service. For SAE J844 air brake tubing, the compound based on Ashlene T940H is formulated at 100 parts by weight base resin, with carbon black masterbatch added at 2.0–2.5 wt% for ultraviolet stabilization, processing lubricant added at 0.1–0.3 wt% only when barrel pressure exceeds 180 bar, and no plasticizer included because plasticizer migration into brake system elastomer seals creates seal swell and fitting torque loss. Melt volume-flow rate is monitored per ISO 1133-1:2022 at 235 °C under 5 kg load; incoming lot deviations of more than 10% from the reference value trigger screw-speed compensation of 5–10 rpm to hold dimensional stability. Pre-drying is performed in a desiccant-wheel dryer with dew point ≤-40 °C at 80–90 °C for 4–6 hours to reach residual moisture ≤0.10 wt%; hydrolysis at moisture above 0.12 wt% appears at the die lip as melt fracture and in finished tube as burst-pressure scatter under SAE J844 pressure cycling. Single-screw extrusion uses a 30:1 L/D barrier screw, a spiral mandrel die with land ratio near 10:1, and melt temperatures between 210 °C and 240 °C; if melt temperature exceeds 245 °C, thermo-oxidative yellowing and viscosity loss reduce burst resistance at -40 °C. The vacuum sizing tank is held at 20–40 °C water temperature with vacuum between 0.2 bar and 0.8 bar, and in-line ultrasonic wall gauges maintain ovality below 0.05 mm at line speeds from 30 m/min to 60 m/min. Finished product types include coiled plain air brake tubing in outside diameters from 6 mm to 16 mm and wall thicknesses from 1.0 mm to 2.0 mm, preformed chassis brake line sections, and reinforced trailer air supply lines.
The use of Ashlene T940H Nylon 11 as an internal pressure sheath in unbonded flexible risers and jumpers is driven by the requirement to tolerate dissolved gas expansion without blister formation when flowline pressure is rapidly reduced. Under API Spec 17J qualification, the polymer sheath is subjected to gas mixtures containing CH₄, CO₂, and H₂S at partial pressures representative of deepwater production, followed by depressurization at rates defined in API 17B or NORSOK M-710; nylon 11 resists blistering because elongation at break exceeds 300% when measured by ISO 527-2 and gas permeability is lower than that of many flexible polyolefins. The formulation addition ratio is 100 parts by weight Ashlene T940H with an oxidative stabilizer package at 0.3–0.5 wt%; external plasticizer is excluded from sour-service designs because hydrocarbon extraction of plasticizer changes glass transition temperature and can increase liner shrinkage on spooling, while impact-modified grades are allowed only where API 17J low-temperature bending tests require them and gas decompression testing remains within acceptance. Downstream production is performed on a floor-mounted single-screw extruder with a grooved feed bush, a barrier screw, and a crosshead die that extrudes a seamless tube directly over the interlocked steel carcass; melt temperature is held at 220–240 °C, and a heated annealing tunnel at 140–160 °C follows the die to relax hoop stress. Without this annealing step, production-scale spooling at bend radii below 10 times the outer diameter has produced stress cracking at carcass overlap edges within 24 hours. Finished product types include smooth-bore and rough-bore pressure sheaths for flexible risers, subsea jumpers, and dynamic riser sections with inside diameters from 50 mm to above 400 mm and wall thicknesses between 5 mm and 12 mm. Published full-scale spooling data for this specific Ashlene T940H configuration is limited, so material selection should be confirmed through coupon-level aging under API 17J sour-service exposure.
Ashlene T940H Nylon 11 is specified for outdoor fiber optic loose tube jackets where the post-extrusion heat shrinkage of the buffer tube must remain below 0.15% after 24 hours at 85 °C because higher shrinkage accumulates as macrobend loss in the optical fiber at midspan. Compliance is demonstrated through IEC 60794-1-2 mechanical and environmental test methods, including temperature cycling, crush, and tensile performance of the completed cable; UV stability is addressed by carbon black loading or by ISO 4892-2 xenon-arc exposure for colored jacket variants. The formulation addition ratio is 100 parts by weight Ashlene T940H, with carbon black masterbatch at 2.0–2.5 wt% for outdoor duct and aerial constructions, processing stabilizer at 0.1–0.2 wt%, and no filler that would reduce elongation below the 200% required for crush recovery. The downstream conversion is pressure extrusion over gel-filled or gel-free fiber unit assemblies at melt temperature 215–235 °C; the extrudate passes into a two-stage water trough with first-stage water temperature set at 40–60 °C to control crystal morphology and reduce tube shrinkage, followed by in-line diameter and shrinkage measurement using laser or ultrasonic stations. Batch-to-batch variation in pellet moisture before predrying is observed as diameter drift exceeding ±0.03 mm; therefore, hopper drying at 80–90 °C to ≤0.10 wt% moisture is maintained even when line speed is reduced to 250 m/min for 2.0–2.4 mm tubes. Finished product types include loose tube fiber units with outside diameters from 1.8 mm to 3.0 mm, multi-tube stranded backbone cables, and armored distribution cables with 12 to 432 fibers.
In fluidized-bed powder coating operations, Ashlene T940H Nylon 11 is converted into a low-porosity corrosion barrier whose service life in warm aqueous environments depends on fusion temperature control and particle-size consistency. Industry compliance for food contact is evaluated under FDA 21 CFR 177.1500 for nylon resin and, for commercial food equipment, NSF/ANSI 51; corrosion protection is validated by ISO 9227 neutral salt spray exposure with scribe creep measured after 1,000 h and by ASTM D4060 abrasion resistance. The formulation addition ratio is 100 parts by weight Ashlene T940H, an antioxidant package at 0.2–0.4 wt%, and no filler when the coating must retain elongation above 200%; titanium dioxide at 1–3 wt% is added only in opaque colored grades where UV exposure is continuous. Downstream production uses cryogenic grinding at mill temperatures below -70 °C to produce a powder distribution centered between 60 μm and 150 μm, then electrostatic spray or fluidized-bed dipping onto degreased steel parts preheated to 290–320 °C; fusion and leveling occur in a circulating air oven at 220–230 °C for 3–6 minutes. The critical processing limit is substrate peak temperature after dipping: if the part temperature falls below 230 °C before powder contacts the substrate, interparticle fusion is incomplete and the coating exhibits sponge-like porosity under 20× microscopy. Finished product types include dishwasher baskets, pump impellers, valve bodies, rail car door rollers, and outdoor electrical housings.
Where evaporative emission regulations compress fuel vapor line permeation allowances, Ashlene T940H Nylon 11 is used as a low-permeation monowall or layer in small engine, marine, and off-road fuel vapor return circuits. The compliance baseline is SAE J2260 for non-metallic fuel system tubing where applicable, with fuel immersion testing under ASTM D543 or manufacturer-specific CARB/EPA evaporative emission cycles to quantify ethanol-blended fuel swelling and permeation. The formulation addition ratio is 100 parts by weight Ashlene T940H, heat stabilizer at 0.3–0.5 wt%, and carbon black at 2.0 wt% where the line is exposed to sunlight; no external plasticizer is used because ethanol extraction of plasticizer would raise permeation and reduce fitting retention. Downstream processing uses a single-screw extruder with 24:1–30:1 L/D and low-shear screw geometry, with melt temperature held at 215–235 °C and barrel zones limited to 245 °C maximum to avoid surface oxidation pitting. Vacuum calibration at 0.2–0.6 bar and laser ovality monitoring maintain tube ovality below 0.05 mm; post-extrusion conditioning at 23 °C and 50% relative humidity for 24 hours stabilizes dimensions before fitting assembly. Finished product types include preformed fuel tank vent lines, vapor return hoses, and quick-connector compatible tubing in outside diameters from 4 mm to 10 mm.
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Ashley Polymers Ashlene T940H Nylon 11 is a heat-stabilized polyamide 11 extrusion grade supplied as cylindrical pellets. The T940H model designation separates it from the general-purpose T940 grade through an H-suffix thermo-oxidative stabilizer package intended for longer melt residence and elevated air service. The polymer base is an aliphatic nylon 11 homopolymer derived from 11-aminoundecanoic acid, which is commercially sourced from castor oil; however, formal bio-carbon content, REACH statements, and lot-specific additive disclosures shall be requested from the manufacturer. The following values are not lot-specific guarantees; they are representative ranges for heat-stabilized PA11 extrusion compounds published under ISO and ASTM protocols.
In dry-as-molded condition, density by ISO 1183-1 is typically 1.02–1.04 g/cm³. Water absorption at 23 °C after 24 h by ISO 62 is approximately 0.3%, and saturation uptake approaches 1.9%. These figures are lower than those for PA6 and PA66, which typically retain 2.5–3.0% moisture at 50% RH equilibrium. The melting peak by ISO 11357-3 commonly falls between 184 °C and 189 °C. Because the grade is intended for extrusion, melt volume-flow rate is not a single defining specification; published data for this specific configuration is limited, and lot-specific capillary rheometry or melt-flow data from Ashley Polymers should be used for die sizing.
Tensile stress at yield by ISO 527-2 at 50 mm/min on dried specimens generally falls between 25 MPa and 35 MPa for this class of flexible heat-stabilized PA11, with elongation at break above 200%. Flexural modulus by ISO 178 is commonly 0.6–0.9 GPa. Notched Izod impact under ISO 180/1A at 23 °C typically shows partial or no break; low-temperature behavior must be measured on actual tube or plaque specimens because plasticizer content, moisture, and test velocity change the ductile-to-brittle transition. The following table summarizes the representative property band used for preliminary engineering review.
| Property | Test method | Typical range for heat-stabilized PA11 extrusion grades |
|---|---|---|
| Density | ISO 1183-1 | 1.02–1.04 g/cm³ |
| Water absorption, 23 °C, 24 h | ISO 62 | 0.3% |
| Water absorption, saturation | ISO 62 | 1.9% |
| Tensile stress at yield | ISO 527-2 | 25–35 MPa |
| Elongation at break | ISO 527-2 | >200% |
| Flexural modulus | ISO 178 | 0.6–0.9 GPa |
| Melting peak | ISO 11357-3 | 184–189 °C |
| Notched Izod impact, 23 °C | ISO 180/1A | partial/no break |
The heat-stabilization suffix does not imply UV stabilization or hydrolysis resistance. It is specifically selected to reduce molecular-weight loss during melt processing and to slow embrittlement during hot-air exposure. In production extrusion, the practical benefit appears as fewer black specks, lower gel counts, and better retention of melt viscosity after a period of line interruption at 230 °C.
Compared with PA6 and PA66, polyamide 11 exhibits lower equilibrium moisture uptake and less dimensional change in humid service. PA6 and PA66 absorb about 2.5–3.0% moisture at 23 °C and 50% RH, while PA11 reaches about 1.1% under the same condition. This narrower moisture swing reduces humid-flexural-modulus loss and improves dimensional stability in tubing. PA12 has even lower saturation moisture uptake, near 1.5%, and a melting peak closer to 175–180 °C; PA12 is often selected for the lowest water absorption and high flexibility, while PA11 is selected when higher melting point and better retention of mechanical properties at 80–100 °C are required. Compared with PA6 and PA66, PA11 has lower specific gravity, lower notch sensitivity at low temperature, and better resistance to stress cracking in zinc chloride. Unreinforced T940H is not a direct substitute for glass-reinforced PA66 or PA6 in structural mounts because its tensile strength and creep modulus are lower.
Before melt processing, T940H must be dried. The recommended drying condition is 4–6 h at 80–90 °C with a desiccant-bed air dew point of -20 °C or lower. If pellets are exposed to ambient air above 60% RH, drying is mandatory; moisture above 0.1% at the feed throat causes splay, hydrolysis, and molecular-weight reduction at melt temperatures, changing tube wall-thickness control. In a grooved-barrel single-screw extruder with L/D 30:1, typical temperature settings are 190 °C in the feed zone, 210–220 °C in the compression zone, and 210–230 °C at the die. A screw with compression ratio 2.5:1 to 3.0:1 and a mixing tip is used for homogenization without excessive shear. Static residence at 230 °C should be limited to 5–8 min; above 250 °C, gel formation and yellowing can occur even with the H package.
Downstream sizing for flexible tube extrusion normally uses a vacuum sizer with water inlet at 30–50 °C. This slow cooling promotes crystallinity development and minimizes internal stress. A quenching bath that is too cold may reduce immediate flexural modulus and create ovality in larger diameters; a bath that is too hot may increase shrunk residual stress. Typical drawdown ratios for PA11 tube lines are below 1.5:1 to avoid excessive orientation, though exact values depend on die land length and melt strength. Melt filtration through 60/80/100 mesh screen packs is common to reduce gels; pressure rise across the screen pack should be monitored and the pack changed before it exceeds 10 MPa.
Rheological characterization by capillary rheometry per ISO 11443 at 230 °C is recommended before setting die land length and drawdown. Flexible extrusion grades of polyamide 11 commonly exhibit apparent shear viscosities in the range 200–800 Pa·s at 100 s⁻¹, but the exact curve depends on molecular weight, moisture, and the heat-stabilizer carrier resin. Because nylon 11 is non-Newtonian, a two-point capillary measurement at 100 s⁻¹ and 1000 s⁻¹ supplies better die-drop and shear-sensitivity estimates than a single melt index. The H stabilization package may raise melt viscosity slightly relative to the non-stabilized grade because of the added chemistry, so pilot runs are required to re-trim screw speed and barrel temperatures after grade changes.
The H suffix in T940H indicates that a stabilizer formulation is added to the melt to retard chain scission and crosslinking during multiple heat histories. In regrind operations, this stabilizer reduces the shift in melt viscosity that would otherwise occur after repeated passes on a single-screw extruder. Regrind addition is generally limited to 20% by weight for tight-dimensional tubing and 30% by weight for non-load-bearing profiles. At 30% regrind on 45 mm extruders, die-pressure fluctuation may increase to ±0.5 MPa because of viscosity heterogeneity; wall-thickness control in 6–10 mm outside-diameter pneumatic tubing becomes more difficult. The heat stabilizer does not eliminate the need for drying of regrind or for screen-pack filtration. It also does not prevent acid-induced hydrolysis or plasticizer loss when the compound is exposed to aggressive oxygenated fuels.
Dimensional stability in precision pneumatic tube is governed by absorbed moisture. At equilibrium in 50% RH, the increase in outside diameter for PA11 is typically less than 0.3%, whereas PA6 and PA66 may exceed 1.0% under the same exposure. This characteristic reduces the need for environmental conditioning before final tube cutting and printing. The value is still not zero; if tubes are assembled into compression fittings at low humidity, subsequent swelling at high humidity can increase insertion force and change pull-off resistance. Designers should compensate for axial growth of approximately 0.1–0.3% in long runs unless the supplier’s lot-specific coefficient of hygroscopic expansion data indicates otherwise.
PA11 is selected for fuel-vapour and air-brake tubing because it combines low water absorption, resistance to aliphatic hydrocarbons, and low-temperature impact without high plasticizer loadings. T940H is specifically relevant in under-hood and heavy-equipment routes where continuous air temperature can exceed 80 °C and short-term excursions may approach 100 °C. The unreinforced flexural modulus of 0.6–0.9 GPa permits tighter bend radii than glass-reinforced PA66 at equivalent burst pressure, but the material is not a direct replacement for PA12 in all automotive fuel lines because PA12 may offer lower moisture uptake and better flexibility in sub-zero tube assembly. Compatibility with fuel blends containing methanol or ethanol must be tested under SAE J844 or ISO 7628, because oxygenated hydrocarbons can extract plasticizer and shift elongation at break below 100%, producing a ductile-to-brittle transition at fittings.
In cable sheathing, T940H is used as a primary jacket over twisted pairs or fiber-optic bundles where low smoke, low fume, and low-temperature flexibility are valued. Processing on a 25 mm single-screw line with a crosshead die at 220 °C typically requires a screw speed that maintains wall thickness variation below ±0.05 mm. The heat-stabilized grade provides better re-extrusion stability when cable line speeds vary; however, adhesion to underlying thermoplastic elastomers or polyethylene insulation must be verified by peel testing under ASTM D1876. Published data for this specific configuration is limited; supplier validation trials are required before scale-up.
As a nylon 11 homopolymer, T940H may be assessed for food-contact suitability under FDA 21 CFR 177.1500 when the specific stabilizers and processing aids are within the referenced limitations. In the European market, Regulation (EU) 10/2011 governs plastic food-contact materials; the final migration test is performed on the finished component, not the pellet. REACH and RoHS declarations must be obtained from Ashley Polymers for the actual production lot because pigmenting and additive packages can vary. The grade should not be melt compounded with high-acid-value olefin copolymers, chlorinated organic additives, or hydrolytic agents without pre-testing. Strong mineral acids, phenols, and oxidizing agents degrade nylon 11; long-term exposure to boiling water or steam above 90 °C may require derating and hydrolysis life evaluation. Storage should maintain original moisture-barrier packaging below 30 °C and below 60% RH. Once opened, the material should be re-dried to 0.05–0.1% moisture before processing.
For injection-molded fittings and connectors, T940H is processed with a melt temperature of 210–230 °C, mold temperature of 40–60 °C, and holding pressure of 50–70 MPa. Hot-runner systems should maintain balanced manifold filling because the material’s low viscosity and narrow freezing range can create overpacked gates. Projected-area clamp force should not fall below 4 kN/cm² for multi-cavity tools. Mold release agents containing silicone should be avoided where post-mold bonding, pad printing, or tube insertion is required.
