| HS Code | 207242 |
| Density | 1.04 g/cm³ |
| Melting Point | 186 °C |
| Vicat Softening Temperature | 170 °C |
| Tensile Modulus | 500 MPa |
| Tensile Strength | 45 MPa |
| Elongation At Break | 300 % |
| Charpy Impact Strength Notched | 30 kJ/m² |
| Shore Hardness | 55 Shore D |
| Water Absorption At Saturation | 1.9 % |
| Water Absorption At 50 Rh | 1.0 % |
| Maximum Continuous Service Temperature | 80 °C |
| Base Polymer | Polyamide 11 (PA11) |
As an accredited Arkema Rilsan BECNO TL PA11 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Rilsan BECNO TL PA11 is supplied in 25 kg sealed multilayer bags, with inner polyethylene liner for moisture protection. |
| Container Loading (20′ FCL) | 20′ FCL: Full container load of Arkema Rilsan BECNO TL PA11, safely packed, secured, and containerized for efficient transport. |
| Shipping | Ship Arkema Rilsan BECNO TL PA11 as non-hazardous plastic powder in sealed, labeled containers. Keep dry and avoid excessive heat or moisture to preserve properties. Use standard freight with proper documentation and secure palletizing. Ensure compatibility with transport regulations for polyamide resins. |
| Storage | Store Arkema Rilsan BECNO TL PA11 in a cool, dry, well-ventilated area in its original, tightly sealed container. Protect from moisture, direct sunlight, and heat sources; ideal storage below 25°C. Keep away from ignition sources and oxidizing agents. Minimize dust formation and handle gently to preserve powder flow and performance properties. |
| Shelf Life | Shelf life is typically 2 years when stored sealed in a cool, dry place, away from heat and moisture. |
Closed-loop desiccant drying at 80 °C to 90 °C for 4 h to 6 h precedes single-screw extrusion of black heat-stabilised PA11 into truck air brake tubing governed by SAE J844 and ISO 7628-2:2019. The resin is converted on single-screw extruders with L/D 28:1 to 30:1, screw compression ratio 2.5:1 to 3.0:1, and screen packs of 80 mesh to 120 mesh, because the shear-thinning PA11 melt can exceed 260 °C at high screw speed, which accelerates thermo-oxidative chain scission and creates surface pitting. The black grade is supplied with carbon black dispersed at the finishing stage, so converter-added masterbatch at 2 wt% to 4 wt% is not used on the floor; this removes a batch-to-batch variable that elsewhere produces agglomerate microvoids in the inner wall when black masterbatch is poorly let down. Barrel temperature zones are set from 210 °C at the feed throat to 245 °C in metering, with head and die at 250 °C to 255 °C. Vacuum calibration at −20 kPa to −60 kPa in water at 20 °C to 40 °C fixes outside diameter, while haul-off controls drawdown to 0.5% to 1.5%; higher drawdown freezes axial orientation that later exhibits itself as splitting after the −40 °C cold-impact requirement. Finished outside diameters from 6.35 mm to 15.88 mm are coiled, and wall thickness is set by burst and elongation requirements. SAE J844 additionally requires stress-crack resistance in zinc chloride, methanol extractables, boiling water immersion, and UV exposure, conditions that remove unmodified PA6 compounds. End products include air brake lines, quick-connect stub tubing, and multi-tube harness assemblies for heavy trucks and trailers.
Co-extruded multi-layer diesel return tubing places black PA11 as the inner fluid-contact layer, where resistance to methyl ester swelling and low moisture absorption justify the material choice. In a typical 4-layer structure the PA11 layer is held between 0.15 mm and 0.30 mm inside a total wall of 1.0 mm to 1.2 mm; above that fraction the melt viscosity at 235 °C to 255 °C produces excessive backpressure on the spiral mandrel die and generates bamboo-like inner-surface marking at line speeds beyond 30 m/min. The outer layers provide rigidity and EVOH oxygen barrier, while the PA11 layer functions as the fluid-contact surface. Tier suppliers screen extraction and swell under ASTM D471-16a in B20 at 60 °C for 500 h, measuring retained tensile elongation per ISO 527-1/-2:2012; published data for the exact BECNO TL black formulation in B20 is limited, so process control relies on ultrasonic wall-thickness measurement, melt-pressure stability, and finished-line tensile testing rather than extrapolated datasheet values. The line is tested for fuel permeation under SAE J2260, where the EVOH barrier dominates and the PA11 layer contributes stress-crack resistance rather than primary permeation control. In service, continuous return fuel at 80 °C and transient sump heating to 120 °C require heat-stabilised chemistry. End components include diesel fuel return lines, tank-to-filter segments, and engine-bay fuel return harnesses for commercial vehicles.
Extruded black PA11 layers in unbonded flexible risers are assigned either pressure containment or anti-wear separation, and the extrusion operation begins only after desiccant drying to below 0.06% residual moisture because thick-wall layering doubles residence time and residual water causes hydrolytic molecular-weight loss at the weld line. A barrier-screw single-screw extruder with L/D 30:1 is used, barrel zones 200 °C to 230 °C, die temperature 235 °C to 245 °C, and melt pressure capped at 25 MPa; higher pressure is associated with shear overheating and localised black speck formation. The extruded sheath, from 50 mm to 400 mm outside diameter, is cooled in stages to avoid residual stress that accelerates slow crack growth in produced-water and H₂S-containing service. Qualification falls under API 17J / ISO 13628-2, and non-metallic sealing layers must pass NORSOK M-710 rapid gas decompression and sour-service ageing; the design limiting parameter is retained elongation after ageing rather than virgin tensile strength. A post-ageing elongation gate above 100% is used to confirm ductility, though published data for the exact BECNO TL grade in sour hydrocarbon media is limited and must be supplemented by batch-specific autoclave testing. End products include extruded inner liners, anti-wear interlayers, and repair sleeves for dynamic riser systems.
For subsea hydraulic control line outer jackets, black UV-stabilised PA11 is applied as a 0.8 mm to 1.5 mm jacket over stainless steel hydraulic control lines used in subsea production, where the polymer layer must survive methanol injection, seawater hydrostatic load, and abrasion during retrieval. The over-jacketing line uses a pressure crosshead die at melt temperature 240 °C to 250 °C, with a preheated stainless steel substrate at 80 °C to 120 °C and an acid-washed oxide finish to promote primer adhesion. Line speed is limited by tube cooling length rather than screw throughput; for 6.35 mm to 12.7 mm stainless steel tube, line speed below 20 m/min prevents internal voids and allows jacket concentricity below 5%. The material is pre-dried below 0.08% moisture, and a L/D 25:1 single-screw extruder with water-ring pellet feed is used. Qualification for subsea production control lines is aligned with API 17E and ISO 13628-5, with rapid gas decompression testing in methanol/CO₂ mixtures under NORSOK M-710 used to detect blow-out bubbles. In these conditions, PA11 outperforms lower-cost PA6 jackets because PA6 softens after hot-wet ageing above 80 °C and loses dimensional stability around fittings. End products include hydraulic control line segments, bundled jumper assemblies, and downhole chemical injection line jackets.
Off-highway electrical harnesses governed by ISO 6722:2018 receive black PA11 cable sheathing where diesel, hydraulic fluid, and low-temperature winding drive material selection. Pressure extrusion through a crosshead die at 230 °C to 250 °C with screw L/D 24:1 to 28:1 and pre-drying below 0.08% moisture is required to prevent pinholes from steam vapor at the conductor surface. Eccentricity is controlled below 5% by centring the conductor through an adjustable die holder, and a water trough at 40 °C to 60 °C is used to reduce frozen-in stress. Fluid immersion under ISO 1817:2015 in hydraulic oil at 100 °C for 168 h is used as a screening threshold; PA11 absorbs less than 2% by mass and retains more than 80% of original tensile strength, whereas PA6 may exceed 6% absorption and fail elongation requirements after oil ageing. The black grade includes carbon black for UV stability on exposed tractor and excavator harness sections; this avoids post-extrusion colour concentrate that can reduce elongation at break. End products include engine-bay harness legs, hydraulic valve control looms, and sensor cable sheathing used in construction and agricultural equipment.
Factory pneumatic logic and valve control tubing made from black PA11 runs in outside diameters of 4 mm to 12 mm with wall thickness from 0.75 mm to 1.50 mm, using vacuum calibration and ultrasonic wall monitoring on high-output extrusion lines. The die land length is set between 10 mm and 20 mm to stabilise melt pressure and reduce die swell; too short a land length is associated with periodic diameter fluctuation, while too long a land length raises melt temperature and surface roughness. The first water tank is held at 20 °C to 30 °C to form a fine spherulite skin, and a second annealing bath at 60 °C to 80 °C reduces residual stress. Drawdown is controlled at 0.95 to 1.10 to avoid axial orientation that depresses hoop stress resistance. For 8 mm × 1 mm tube, hydrostatic burst testing at 23 °C under ISO 1402 is used to confirm burst pressure above 4.0 MPa; the operating pressure in high-cycle circuits is limited to 1.0 MPa with a 4:1 safety factor. Chemical exposure screening includes air compressor oil condensate, zinc chloride solution, and 5% methanol, after which push-in fitting retention must remain within the supplier’s dimensional tolerance. End products include cut-to-length valve manifold lines, coiled return tubing, and pre-formed robotic end-effector harnesses.
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Arkema Rilsan BECNO TL PA11 is an unfilled, natural, heat- and light-stabilized polyamide 11 resin manufactured from castor oil-derived 11-aminoundecanoic acid. The polymer chain contains one amide group per 11 backbone carbon atoms, a lower amide density than PA6 or PA66, which reduces equilibrium moisture absorption and lowers density. Typical published values for unplasticized heat-stabilized PA11 fall at 1.03–1.05 g/cm³ for density under ISO 1183-1, 188–192 °C for melting endotherm under ISO 11357-3, 1200–1450 MPa for dry tensile modulus under ISO 527-2, and 70–75 Shore D under ISO 868. The TL suffix denotes stabilization against thermal oxidation and ultraviolet-induced chain scission, but the natural uncolored supply form still requires carbon black or another UV absorber for long-term outdoor exposure. The resin is supplied in granular form for tube extrusion, cable sheathing, technical profile, and selected injection-molding applications where the long-chain aliphatic structure of polyamide 11 is required. Current Arkema lot-certificate data supersede the values above because grade-specific stabilization and molecular weight can shift these figures.
Compared with polyamide 12, Rilsan BECNO TL PA11 has one fewer methylene unit per repeat unit, which increases amide concentration and typically raises melting point and dry modulus while retaining low moisture uptake and low density. Polyamide 12 is usually specified at 1.01–1.02 g/cm³ density and a melting endotherm around 174–180 °C; PA11 melts roughly 10–15 °C higher and therefore remains dimensionally more stable in underhood tube applications where peak service temperatures approach 120 °C. Both long-chain polyamides exhibit hydrocarbon resistance that is superior to PA6 and PA66 in fuel-contact service. The selection between PA11 and PA12 is often controlled by bio-content, melt-temperature margin, and local source qualification rather than by a single mechanical property.
Within the Rilsan PA11 product family, BECNO TL differs from plasticized grades such as the BESNO P40 TL class primarily by the absence of an intentionally added low-molar-mass plasticizer. Plasticized PA11 grades reduce Shore D hardness and low-temperature flexural modulus, but they also reduce creep resistance and can exhibit plasticizer migration at continuous elevated temperature. BECNO TL is therefore selected for rigid or semi-rigid tubing and jacketing that must maintain hardness and dimensional stability under continuous load. Glass-reinforced Rilsan grades, in contrast, raise tensile modulus through short glass fiber while lowering elongation at break and increasing abrasion against mating metal surfaces.
Against PA6 and PA66, the long-chain amide structure of PA11 reduces saturated moisture uptake to roughly 1.8–2.5 wt% under ISO 62, compared with 8–10 wt% for PA6. This lower moisture absorption limits the plasticizing effect of water and preserves modulus and dimensional stability in humid environments. However, PA11 has a lower heat deflection temperature and lower dry modulus than PA66; it is not a direct substitute in structural components requiring high-temperature stiffness.
The following comparison is drawn from typical published ranges for unfilled, dry specimens; conditioned values shift according to water content and morphology.
| Property | Standard | Unplasticized heat-stabilized PA11 | PA12 typical | PA6 typical | PA66 typical |
|---|---|---|---|---|---|
| Density | ISO 1183-1 | 1.03–1.05 g/cm³ | 1.01–1.02 g/cm³ | 1.12–1.14 g/cm³ | 1.13–1.15 g/cm³ |
| Melting endotherm | ISO 11357-3 | 188–192 °C | 174–180 °C | 220–225 °C | 260–265 °C |
| Moisture saturation, 23°C | ISO 62 | 1.8–2.5 wt% | 1.5–1.8 wt% | 8–10 wt% | 7–9 wt% |
| Tensile modulus, dry | ISO 527-2 | 1200–1450 MPa | 1000–1400 MPa | 2600–3200 MPa | 2800–3400 MPa |
| Shore D hardness | ISO 868 | 70–75 | 65–70 | 75–80 | 76–82 |
Drying is the single largest production variable. The resin is hygroscopic, and melt processing with residual moisture above 0.08 wt% accelerates hydrolytic chain scission at 230–250 °C. A desiccant dryer operated at 80–90 °C for 4–6 h with a dew point below -30 °C is the standard preparation. Hopper drying is insufficient when ambient relative humidity exceeds 60%. Residual moisture can be verified by ISO 15512 or Karl Fischer coulometry; a moisture analyzer is not a substitute for melt-sensitive polyamide grades.
In tube extrusion, a single-screw extruder with 24:1–32:1 L/D, a compression ratio of 2.5:1–3:1, and 40–60-mesh screen pack is typically used. Melt set points should remain between 220 °C and 250 °C; stock temperatures above 260 °C shorten the TL stabilizer’s oxidative induction time. Actual melt temperature may exceed barrel set points by 5–12 °C because of shear heating, so melt-temperature probes at the breaker plate or gear pump inlet are recommended.
Injection molding, where used, is run at melt temperatures of 230–250 °C and mold temperatures of 30–60 °C. Higher mold temperatures increase crystallinity and dimensional stability but lengthen cycle time. The grade is not designed for hot-runner hold times exceeding the manufacturer’s stated melt residence limit; prolonged hold-up leads to discoloration, black specks, and viscosity drift.
On production-scale tube lines, inadequate drying is a documented cause of surface sharkskin, diameter variation, and microvoids that reduce burst pressure. The same failure mode appears as delamination in multilayer fuel line constructions because moisture volatilizes at the die and disturbs interlayer adhesion. These defects are not corrected by raising melt temperature; higher heat input increases degradation without removing water.
Rilsan BECNO TL PA11 is processed into diesel and biodiesel fuel-system tubing, compressed-air brake lines, hydraulic hose jackets, pneumatic conduits, and cable sheathing. In fuel-contact service, long-chain polyamides provide low hydrocarbon permeation and resistance to stress cracking; tube specifications commonly require testing under SAE J2260 for low-permeation fuel systems and SAE J844 or FMVSS 571.106 for air brake tubing. Multilayer constructions may combine PA11 with fluoropolymer or polyolefin tie layers to balance permeation, flexibility, and cost.
In low-permeation biodiesel lines, oxidative aging of unstabilized or under-dried PA11 can be accelerated by hydroperoxides in aged biodiesel. The TL stabilization package addresses thermal and light exposure, but final article testing at the intended B20 or B100 blend and service temperature is required because fuel-oxidation chemistry, trace metals, and water can change extraction behavior. Published data for this specific configuration is limited for aggressive oxidized biodiesel blends; converter qualification is required.
Cable jacketing with BECNO TL is specified where the sheath must survive hydrocarbon exposure and mechanical abrasion. The unfilled grade has lower modulus than PA66 jacketing, which reduces cable bending stiffness but also reduces notched impact resistance relative to plasticized PA11. Flame rating is normally UL 94 HB for unfilled natural PA11; plenum or riser cable classifications require separate flame-retardant formulations.
The low amide density in PA11 limits reversible moisture absorption and reduces hydrogen bonding that can plasticize the matrix. Saturated moisture uptake at 23 °C is typically 1.8–2.5 wt% under ISO 62, while PA6 and PA66 absorb 8–10 wt% and 7–9 wt%, respectively. Lower moisture uptake preserves dimension and modulus in humid service, but it does not eliminate hydrolysis at melt temperature. Moisture absorbed during storage must still be removed before processing.
Hydrocarbon resistance of PA11 is controlled by the aliphatic segments and amide hydrogen bonding; the resin is widely used for fuel-contact layers because it develops crystallinity that retards hydrocarbon diffusion. Permeation is thickness- and draw-ratio-dependent, and specifications such as SAE J2260 are written around the finished multilayer tube rather than the raw resin. Single-layer PA11 tube may not satisfy all low-permeation automotive limits without barrier layers or increased wall thickness.
Stress-cracking resistance in chloride-salt environments is another differentiator. Long-chain PA11 is specified for truck air brake and chassis tubing because it resists zinc chloride and road-salt-induced stress cracking better than PA6/PA66. However, service life depends on external jacketing, UV exposure, plasticizer content, and processing residual stress. Annealing or stress-relief after extrusion can reduce molded-in stress and lower susceptibility to environmental stress cracking.
Operational boundaries should be observed. The resin is not intended for continuous exposure to strong mineral acids, phenols, formic acid, or halogenated solvents at elevated temperature. Natural BECNO TL is UV-stabilized but will yellow and lose surface gloss over time; outdoor articles should be carbon-black pigmented or co-extruded with a UV-opaque jacket. Drying is mandatory when ambient relative humidity exceeds 60%, and regrind levels should be validated for each article because repeated shear and thermal history degrade the stabilizer and increase gel content. The product is not a drop-in substitute for PA66 in high-temperature structural parts, for PA12 in maximum low-temperature impact, or for plasticized PA11 in high-flex-fatigue tubing. Processors should obtain the current Arkema technical data sheet, processing guide, and regulatory statement for the exact lot, because natural-grade formulations can differ in molecular weight, stabilization, and food-contact status.
The regulatory boundary is document-dependent; the following matrix identifies the required verification route rather than an unconditional approval.
| Regulatory domain | Standard or framework | Boundary for BECNO TL |
|---|---|---|
| European chemical regulation | EU 1907/2006 REACH | Resin registration is supplier-side; converter article obligations remain |
| Hazardous substances restriction | 2011/65/EU RoHS | Final-article verification required; pigments and process aids can alter the profile |
| Food-contact polyamide | FDA 21 CFR 177.1500 | Only when the exact grade and use condition are covered by a current manufacturer statement |
| Plastics water content | ISO 15512 | Used for drying validation before melt processing |
