| HS Code | 897730 |
| Density | 1.02 g/cm³ |
| Bulk Density | 0.45 g/cm³ |
| Melting Point | 186 °C |
| Glass Transition Temperature | 45 °C |
| Crystallization Temperature | 131 °C |
| Tensile Modulus | 1400 MPa |
| Tensile Strength At Yield | 44 MPa |
| Elongation At Break | 35 % |
| Charpy Impact Strength Notched | 4 kJ/m² |
| Shore D Hardness | 75 D |
| Water Absorption 24h | 1.1 % |
| Particle Size D50 | 30 µm |
As an accredited Arkema Rilsan BESNO 23 TL4CC PA11 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied as 25 kg sealed multilayer paper bags, this PA11 resin comes in dry pellets, ensuring safe handling and moisture protection. |
| Container Loading (20′ FCL) | 20′ FCL loading: Arkema Rilsan BESNO 23 TL4CC PA11, packed on pallets, secured and containerized for safe transport. |
| Shipping | Ship Arkema Rilsan BESNO 23 TL4CC PA11 as a non-hazardous polymer granulate/powder in sealed moisture-proof bags or drums. Keep dry, avoid prolonged heat and direct sunlight. Use standard covered transport (truck/container) with adequate ventilation, and protect from physical damage during loading and unloading. |
| Storage | Store Arkema Rilsan BESNO 23 TL4CC PA11 in its original sealed container in a cool, dry, well-ventilated area. Keep away from direct sunlight, heat sources, and moisture. Ensure the container is tightly closed after each use to prevent humidity absorption. Avoid contact with incompatible materials. Handle with care to minimize dust and contamination. |
| Shelf Life | Shelf life is typically 2 years from date of manufacture when stored unopened in a cool, dry place. |
On high-volume extrusion lines producing coiled air-brake tubing for heavy-goods vehicles, Arkema Rilsan BESN 23 TL4CC PA11 is run as a semi-flexible, heat-stabilized tube resin whose melt rheology is selected to hold concentric 4–16 mm outside diameters through vacuum calibration. The applicable qualification framework is SAE J844 (current revision) and ISO 7628-2:2010, with European chassis applications also invoking DIN 74324; type approval includes burst strength at 23 °C and 100 °C, elongation after air oven ageing, and low-temperature impact at -40 °C. The basic extrusion formulation is 100 parts BESN 23 TL4CC, with post-industrial spool ends and startup scrap reintroduced only up to 15 wt%; rework above this threshold is not accepted for SAE J844 low-temperature impact after ageing because the shift in intrinsic viscosity and the restructuring of plasticizer distribution reduce cold ductility. External plasticizer is not added at the converter because the grade is pre-compounded for target tube flexibility, and adding liquid plasticizer at the feed throat creates screw slip and inconsistent melt density. In-process conditions require desiccant drying to ≤0.08 wt% residual moisture at 80 °C for 4–6 h; when ambient relative humidity exceeds 60%, desiccant-bed dew point is held at -40 °C or lower. A single-screw extruder with 30:1 L/D, barrier flight, and 40/80 mesh screen pack is used, with melt temperature at the die held between 215 °C and 245 °C. Tube dimensions are set in a vacuum calibration tank with -0.04 MPa to -0.08 MPa pulled against the calibrator, followed by controlled cooling to limit longitudinal shrinkage. Failure modes observed on production lines include bubble formation when residual moisture exceeds 0.08 wt%, surface melt fracture above 250 °C, and out-of-round lumens when calibration vacuum is insufficient or haul-off tension varies. The terminal product range includes Type A coiled air-brake tube assemblies for trailer circuits, straight chassis lines, and utility tube for air-over-hydraulic braking installations.
The specification of Rilsan BESN 23 TL4CC PA11 in unbonded flexible pipe pressure sheaths is governed less by short-term tensile strength than by long-term resistance to hydrolysis, plasticization, and rapid gas decompression under mixed sweet and sour hydrocarbon streams. The material must satisfy API 17J (current revision) and ISO 13628-2:2006/Amd 1:2017 for unbonded flexible pipe, with polymer qualification under ISO 23936-1:2022 and sour-service confirmation under NORSOK M-710. The pressure sheath formulation is 100 parts virgin BESN 23 TL4CC; regrind is not introduced into this layer unless a full API 17J requalification program demonstrates equivalent rapid gas decompression and long-term hydrostatic performance. A black carbon black masterbatch is not normally incorporated in the pressure sheath because the layer is not exposed to UV, and any additive change alters the failure sequence in depressurization tests. Production extrusion takes place over a steel carcass with a slow-turning, low-shear single-screw extruder of 33:1 L/D and a melt pump; melt temperature at the die is kept in the 225–245 °C window to prevent both unmelts and thermal oxidation. The thick wall, commonly between 6 mm and 10 mm depending on design pressure, is cooled gradually through air and water zones to avoid internal void formation, and the cooling rate is deliberately limited because rapid quenching traps high free volume that reduces barrier performance and increases explosive decompression damage. Field-scale failure modes observed on actual flexible pipe extrusion lines include die drool when the temperature exceeds 250 °C, splay in high-humidity conditions when drying is below 0.08 wt% moisture, and sag-induced wall eccentricity on unsupported lengths between die and first quench. The terminal products include unbonded flexible risers, flowlines, and jumpers for offshore oil and gas transport; published data for this specific grade in high-pressure sour gas configurations is limited, and project-specific qualification is the governing boundary rather than general polymer datasheet values.
Subsea control line sheathing converts BESN 23 TL4CC into a thin-walled jacket that must maintain concentricity around electrical conductors, optical fibers, and hydraulic control tubes while resisting hydrostatic pressure, seawater, and installation-induced bending. Code compliance is driven by API 17E:2017 and ISO 13628-5:2009 for subsea umbilicals, and for marine cable installations IEC 60092-351:2017 with NEK 606:2016. The standard outer-sheath formulation is 100 parts BESN 23 TL4CC; if a black UV-resistant outer sheath is specified, 5.0–7.5 wt% of a 40 wt% carbon black PA11 masterbatch is added to obtain 2.0–3.0 wt% elemental carbon. Post-industrial regrind is limited to 10 wt% and used only in outer sheath layers after each lot passes low-temperature flexure and concentricity testing; core insulation layers are run with 100 parts virgin resin. Processing uses a crosshead die on a single-screw extruder with 25:1 L/D, gravimetric dosing, and melt temperature between 220 °C and 245 °C; pressure tooling is preferred over tubing tooling because it compresses the melt against the core and avoids ballooning during line-speed changes. Line speed varies with sheath diameter, typically 30–120 m/min for 1.0–2.5 mm wall thickness, and cooling is staged so that the sheath does not shrink onto the optical fiber and create microbend-induced attenuation. Terminal products include subsea control lines, ROV neutrals, fiber optic sheaths, and flying leads connecting subsea distribution hubs to wellheads.
Monofilament conversion of BESN 23 TL4CC uses the resin polymer melt strength and low moisture uptake to maintain circular cross-sections during high-draw orientation. The applicable compliance framework depends on end use: for food-contact filtration mesh, FDA 21 CFR 177.1500 and EU 10/2011 govern monomer migration and overall migration limits; for industrial paper-machine clothing, quality conformance is audited against ISO 9001 with tensile properties tested to ISO 527-2:2012 or ASTM D638-14 where North American reference is required. The formulation baseline is 100 parts BESN 23 TL4CC; if a colored product is required, 0.5–1.0 wt% of a PA11-compatible pigment masterbatch is added, and for food-contact grades this masterbatch must meet the same regulatory status as the base resin. External lubricants are not normally used because the grade already contains sufficient internal lubrication for stable die operation; adding low-molecular-weight lubricants above 0.3 wt% can cause surface haze and reduce orientation stability. Extrusion proceeds through a heated spinneret plate with hole diameters from 0.5 mm to 2.0 mm, followed by water quenching at 20–30 °C, two-stage hot drawing to a total draw ratio between 3.5:1 and 4.5:1, and heat setting at 160–180 °C to control shrinkage. Terminal products include monofilament fabrics for paper-machine clothing, filter mesh, and technical brush bristles for industrial cleaning systems.
In gasoline vapor return and evaporative emission lines, PA11 is selected for low fuel permeation, stress-cracking resistance, and dimensional stability under under-hood thermal cycling. Qualification is tested under SAE J2260 (current revision) for non-metallic fuel system tubing and SAE J1737 where fuel line assemblies are evaluated; emitted hydrocarbon limits are linked to EPA 40 CFR Part 86 evaporative emission procedures for the vehicle platform. The base formulation is 100 parts BESN 23 TL4CC; post-industrial regrind is held to 10 wt% maximum because multiple heat histories reduce elongation at break at -30 °C and increase fuel permeation through microscopic gel boundaries. No external plasticizer is added; the converter relies on the grade semi-flexible balance, and addition of an external plasticizer would shift permeation well above the low-emission threshold. Extrusion is run on a barrier screw with 24:1–30:1 L/D, melt temperature 220–240 °C, and in-line vacuum sizing with diameter tolerance held to ±0.05 mm; moisture must remain below 0.08 wt% to prevent bubble defects that act as permeation sites. Terminal product types include gasoline vapor return lines, EVAP canister tubing, and fuel filler neck vent tubes.
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Arkema Rilsan BESN 23 TL4CC PA11 is a high-viscosity polyamide 11 extrusion-grade resin supplied as black granules. The commercial designation places the product within the Arkema BESN family of PA11 resins engineered for industrial extrusion and selected injection-molding operations. The 23 marker identifies a controlled relative-viscosity class used to differentiate the grade from lower-viscosity BESN P20 TL and higher-viscosity BESN P40 TL products. The TL4CC suffix denotes the carbon-black pigmentation and stabilizer package, which provides black part appearance and ultraviolet screening during outdoor service. The PA11 backbone contains one amide group per eleven aliphatic carbon atoms, a structure that yields lower water uptake than PA6 or PA66 and higher renewable-carbon content than PA12. This grade is typically specified for tube, hose, profile, and thick-wall extrusion where melt strength, moisture resistance, and dimensional stability are required in wet or outdoor conditions.
Within the Rilsan PA11 product line, BESN P20 TL is specified for thin-wall tubing and cable jacketing because its lower melt viscosity supports high line speeds. BESN P40 TL is selected for thick-section extrusion because of its higher melt strength and resistance to sag. BESN 23 TL4CC occupies an intermediate melt-viscosity position and is used where black pigmentation, ultraviolet resistance, and controlled dimensional tolerances are required in service. The carbon-black additive package reduces surface photolysis and masks discoloration, but carbon black also tends to reduce elongation at break and notched impact strength relative to an unfilled natural PA11 of similar viscosity class. Published data sheets for this specific carbon-black formulation do not always list the exact pigment loading; the additive package is controlled through the manufacturer’s certificate of analysis. The nominal melting temperature of the resin is 189 °C by differential scanning calorimetry in accordance with ISO 11357-3:2018. The grade remains a semicrystalline aliphatic polyamide with high melt viscosity and a defined processing window.
The PA11 repeat unit has lower amide concentration than PA6 or PA66 and slightly higher amide concentration than PA12. This chemical positioning reduces equilibrium moisture absorption compared with short-chain polyamides. At 23 °C and 50% relative humidity, PA11 typically stabilizes at 0.9–1.0 % moisture by mass when tested under ISO 62:2008, while PA66 absorbs approximately 2.5 % under the same conditions. The reduced moisture uptake limits hydrolysis-induced molecular weight loss in hot or humid service and restricts dimensional change in parts exposed to varying ambient humidity. The aliphatic eleven-carbon segment also retains sufficient chain mobility to provide ductile response at low temperature. The monoclinic α-phase crystallization of PA11 yields adequate stiffness for fittings and pressure-retaining tube walls without the brittleness associated with higher amide-density polyamides.
| Property | Test Method | Representative Value |
|---|---|---|
| Density | ISO 1183-1:2019 | 1.04 g/cm³ |
| Melt volume-flow rate, 235 °C / 2.16 kg | ISO 1133-1:2022 | 3–6 cm³/10 min |
| Melting temperature | ISO 11357-3:2018 | 189 °C |
| Water absorption, 23 °C / 50 % RH equilibrium | ISO 62:2008 | 0.9–1.0 % |
| Tensile modulus | ISO 527-1:2019 / ISO 527-2:2012 | 1,100–1,250 MPa |
| Tensile stress at yield | ISO 527-2:2012 | 42–48 MPa |
| Nominal strain at break | ISO 527-2:2012 | >200 % |
| Charpy notched impact, 23 °C | ISO 179-1:2010 | 8–12 kJ/m² |
| Charpy notched impact, -40 °C | ISO 179-1:2010 | 4–6 kJ/m² |
| Vicat softening temperature, A50 | ISO 306:2022 | 160 °C |
| Heat deflection temperature, 0.45 MPa | ISO 75-2:2020 Method B | 140 °C |
| Shore D hardness | ISO 868:2003 | 70 |
Values in the table are representative property envelopes for a dry-as-molded PA11 grade of this class and are not specification limits. Final qualification for pressure-rated parts should use the lot-specific certificate of analysis.
Moisture control is the primary process conflict associated with BESN 23 TL4CC. Pellets stored at relative humidity above 60 % will exceed the recommended residual moisture limit of 0.08 % by mass within hours of open-hopper exposure. Desiccant drying should be conducted at 80–90 °C for 4–6 h, with a dryer dew point at or below -30 °C. Holding hopper residence time beyond 8 h after drying is not advised unless the hopper is blanketed with dry air. Processing at residual moisture above 0.12 % produces hydrolysis, observed as a decline in melt pressure and an increase in melt volume-flow rate. On a production-scale single-screw extruder, a screw with an 24:1 to 30:1 L/D ratio and compression ratio of 3:1 to 3.5:1 is used. The feed zone is typically set at 220 °C, the compression zone at 235–240 °C, the metering zone at 245 °C, and the die at 235 °C. Melt temperature should be maintained between 235 °C and 250 °C. Excursions above 270 °C should be limited to less than 5 min because thermal-oxidative chain scission accelerates rapidly and carbon-black grades can develop local hot spots. A gear pump is beneficial for stabilizing head pressure; die pressure variation on a 50 mm single-screw line should be controlled within ±5 bar to avoid wall-thickness pulsation in tube and profile extrusion.
When the grade is injection molded into fittings or connectors, barrel temperatures of 220–250 °C and mold temperatures of 40–80 °C are used. The high relative viscosity requires sufficient injection speed to avoid premature skin solidification. Gate freeze-off occurs more rapidly than with lower-viscosity PA11 grades, so pressure-holding time should be established by part weight stability rather than by constant timer settings. Sink marks in thick bosses may be mitigated by increasing packing pressure and mold temperature, but not by raising melt temperature above the degradation threshold.
Automotive air-brake tubing and fuel-vapor return lines are representative applications. In corrugated tube production, the high-viscosity grade is selected because the corrugator vacuum must retain the melt while the tube remains above the crystallization onset temperature. PA11 absorbs less atmospheric moisture than PA6 or PA66, so the extruded profile remains dimensionally stable during seasonal humidity changes. In multi-layer flexible offshore pipe internal pressure sheaths, Rilsan PA11 BESN-type grades have been used for resistance to hydrolysis and low hydrocarbon permeation. Published data for BESN 23 TL4CC in deepwater multi-layer configurations is limited, so qualification should include pipe-scale aging under the specific service temperature and depressurization rate.
If condensation or continuous water exposure is anticipated, PA11 is selected over PA6 or PA66 because of its lower equilibrium moisture regain. At saturation in liquid water at 23 °C, PA11 absorbs approximately 1.8 % by mass when measured under ISO 62:2008. PA66 absorbs approximately 8.5 % and PA6 approximately 9.5 % under equivalent conditions. The lower water capacity means that tensile modulus of a conditioned PA11 grade typically declines by only 10–20 % relative to dry as molded, whereas short-chain polyamides may lose 40–50 % of their dry modulus. In zinc chloride salt-spray exposure, PA11 is also less prone to stress cracking than PA6 or PA66, which is relevant for automotive underhood fittings exposed to road salts. The carbon-black package in TL4CC delays ultraviolet-induced surface microcracking, although carbon black can slightly increase moisture absorption relative to unfilled natural PA11 because pigment-polymer interfaces create additional diffusion paths. This trade-off is accepted when black color and outdoor weatherability are required.
Compared with PA12, BESN 23 TL4CC PA11 exhibits a higher melting point, about 189 °C versus approximately 176 °C, and a higher tensile modulus because the PA11 repeat unit contains one additional amide group per chain segment. PA12 retains an advantage in extreme low-temperature flexibility and slightly lower equilibrium moisture absorption. Compared with PA612, PA11 offers lower moisture uptake and lower density but generally lower heat deflection temperature. Compared with PA66, BESN 23 TL4CC PA11 has far lower water absorption, lower density, and better retention of impact toughness after conditioning, but it does not match the dry elevated-temperature creep resistance of PA66. The following comparison presents unfilled, dry-as-molded family averages and should not be read as a direct product specification for each resin.
| Property Family Average | BESN 23 TL4CC PA11 | PA12 | PA612 | PA66 |
|---|---|---|---|---|
| Density | 1.04 g/cm³ | 1.01 g/cm³ | 1.06 g/cm³ | 1.14 g/cm³ |
| Melting temperature | 189 °C | 176 °C | 218 °C | 260 °C |
| Water uptake, 23 °C / 50 % RH | 0.9 % | 0.7 % | 1.3 % | 2.5 % |
| Tensile modulus, dry | 1,100–1,250 MPa | 900–1,200 MPa | 1,500–1,800 MPa | 2,500–3,000 MPa |
| Heat deflection temperature, 0.45 MPa | 140 °C | 115 °C | 155 °C | 200 °C |
| Notched Charpy impact, -40 °C | 4–6 kJ/m² | 5–7 kJ/m² | 5–7 kJ/m² | 2–4 kJ/m² |
The comparative values are drawn from standard unfilled polyamide product literature and are conditioned by test specimen geometry and moisture state. The testing standards align with the property table above: density by ISO 1183-1:2019, melting temperature by ISO 11357-3:2018, tensile properties by ISO 527-2:2012, heat deflection by ISO 75-2:2020, and impact by ISO 179-1:2010.
Incompatibilities and operational boundaries should be observed. The grade is not recommended for long-term contact with concentrated hydrochloric acid, formic acid, or strong oxidizing phenolic media, which promote chain scission or stress cracking in PA11. For food-contact or potable-water service, the manufacturer’s compliance documentation for the specific formulation should be consulted because the carbon-black and stabilizer package may affect the applicable regulatory status under FDA 21 CFR or national drinking-water standards. Storage should be maintained in sealed containers at or below 35 °C and 60 % relative humidity until use. Unprocessed material should be dried as specified before any extrusion or molding campaign.
