| HS Code | 543673 |
| Density | 1.04 g/cm³ |
| Melting Point Dsc | 183 °C |
| Glass Transition Temperature | 40 °C |
| Vicat Softening Point 50 N | 100 °C |
| Melt Flow Index 235 C 2 16 Kg | 2.5 g/10 min |
| Tensile Stress At Yield 23 C | 32 MPa |
| Elongation At Break 23 C | 300 % |
| Tensile Modulus 23 C | 700 MPa |
| Flexural Modulus 23 C | 650 MPa |
| Charpy Impact Strength Notched 23 C | No break |
| Shore D Hardness | 60 |
| Water Absorption 24 H At 23 C | 1.2 % |
| Water Absorption At Saturation 23 C | 2.5 % |
| Volume Resistivity | 1e12 ohm·cm |
As an accredited Arkema Rilsan BESN BLACK P126 T6L PA11 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Arkema Rilsan BESN BLACK P126 T6L PA11 is supplied in 25 kg sealed, moisture-resistant bags. |
| Container Loading (20′ FCL) | 20′ FCL loading of Arkema Rilsan BESN BLACK P126 T6L PA11 pellets, secured in palletized bags, ensuring safe, dry transport. |
| Shipping | Arkema Rilsan BESN BLACK P126 T6L PA11 is a non-hazardous polyamide resin supplied as pellets. Ship in sealed, moisture-proof packaging to prevent water absorption. Store away from heat, ignition sources, and direct sunlight. Standard dry freight is suitable; avoid condensation during transit. Handle with clean, dry equipment. |
| Storage | Store Rilsan BESN BLACK P126 T6L PA11 in its original, unopened container in a cool, dry, well-ventilated area. Keep away from direct sunlight, heat sources, and open flames. Ensure the container is tightly sealed to prevent moisture absorption, which can affect performance. Avoid excessive stacking and maintain moderate temperatures for optimal shelf life. |
| Shelf Life | Shelf life is typically 2 years when stored in original, unopened packaging in a cool, dry place. |
Under cyclic fuel exposure, dimensional control in coextruded fuel vapor recovery lines depends on the high melt viscosity of Rilsan BESN BLACK P126 T6L and on the residual moisture content of the compound before extrusion. The grade is introduced as an inner liner at 0.20 mm to 0.40 mm wall thickness in multilayer constructions in which an EVOH barrier of 0.10 mm to 0.15 mm is tie-bonded to the PA11 layer and a PA12 external jacket supplies impact resistance. Pre-drying in a desiccant hopper with air dewpoint below -30°C at 80°C until residual moisture is below 0.08% by weight according to ISO 15512 is mandatory; water above this limit hydrolyzes the polymer when the melt remains between 235°C and 260°C for more than 15 min. Coextrusion tooling with spiral mandrel distribution heads and die land ratios from 10:1 to 15:1 is used to control layer uniformity; die exit melt temperature should not exceed 260°C during extended runs because thermo-oxidative degradation creates black specks at the die lip. Finished tubing is evaluated under SAE J2260 for construction, burst, and collapse requirements and under SAE J1737 for hydrocarbon permeation; terminal components include gasoline vapor return lines, fuel filler neck connectors, and fuel tank vent tubes on passenger cars and heavy-duty vehicles. When qualification includes immersion in ASTM D6751-compliant biodiesel blends followed by tensile testing according to ISO 527-2, published data for this specific configuration is limited, and the end user should generate property retention curves rather than assume equivalence with PA12.
Continuous service temperature in truck air brake tubing made from Rilsan BESN BLACK P126 T6L is limited not by initial tensile strength but by oxidative embrittlement at the fitting barb after long-term exposure to compressor oil and road-borne chloride solutions. Extrusion of unreinforced tube in 8 mm × 6 mm, 10 mm × 8 mm, and 12 mm × 9 mm sizes is performed on a single-screw extruder with L/D 30:1 and a compression ratio of 2.8:1 to 3.2:1; melt temperature at the die is held between 230°C and 250°C, and vacuum sizing is maintained at -0.6 bar to -0.8 bar to minimize ovality. The black grade carries UV stabilization sufficient for underbody exposure, but dilution with natural regrind should not reduce carbon black content below 2.0% by weight because outdoor life in direct sunlight then decreases rapidly. Qualification under SAE J844 and SAE J1131 covers burst pressure, cold impact, oil resistance, and whip resistance; a tube with 8 mm outside diameter commonly requires burst pressure above 2.4 MPa and must survive a -40°C impact without visible fracture when tested according to ISO 179-1/1eA. Long-term exposure to zinc chloride from de-icing salts is a known stress-cracking agent for polyamides; fittings and clips should be selected from grades that do not release zinc ions under wet conditions. The equilibrium water uptake of PA11 according to ISO 62 remains below 2.0% at saturation, which stabilizes the glass transition and helps retain burst strength at -40°C; published data for this specific formulation is limited, so production lots should be checked for notched impact retention after 1000 h heat aging at 125°C according to ISO 188.
Unbonded flexible pipe liners extruded from Rilsan BESN BLACK P126 T6L are subjected to a combination of axial tensile load, spooling-induced bending, and internal pressure that makes ovalization control the primary geometry tolerance. Large-diameter pipe from 50 mm to 600 mm outer diameter with wall thickness between 5 mm and 15 mm is produced using a grooved feed extruder with screen pack support; pellet moisture is reduced to below 0.06% by weight in a vacuum dryer before melting because the long residence time of thick-walled extrusion magnifies hydrolytic degradation. Melt temperature is kept between 220°C and 240°C at the adapter, and the melt is cooled gradually through water baths held at 15°C to 25°C to limit frozen-in stress. Gradual cooling rather than direct quench is required because a steep thermal gradient creates internal shrinkage differences that produce an increase in ovality after spooling. The liner is qualified under API 17J and ISO 13628-2 for unbonded flexible pipe; polymer-specific qualification follows ISO 23936-2, including resistance to pressure, temperature, and produced fluids. Rapid gas decompression resistance is assessed according to NORSOK M-710 Annex B; the liner must not blister after repeated decompression cycles from methane and carbon dioxide saturation. Methanol, used for hydrate inhibition, plasticizes PA11 when the continuous phase exceeds a threshold that depends on temperature and pressure; qualification should include exposure to 10% methanol in water at the maximum design temperature. Sour service with hydrogen sulfide partial pressure above 0.1 bar requires supplementary testing because carbonyl absorption and chain scission can accelerate crack initiation at the inner surface. The final liner is spooled onto reels with minimum bend radius governed by API 17J design criteria; ovality measured at the pipe ends should remain below 2.0% of nominal outer diameter.
| Application sector | Primary standard | Test condition or requirement | Grade-specific limit |
|---|---|---|---|
| Automotive fuel lines | SAE J2260, SAE J1737 | Burst, collapse, hydrocarbon permeation | Moisture below 0.08% before extrusion; die melt not above 260°C |
| Truck air brake tubing | SAE J844, ISO 179-1/1eA | Cold impact at -40°C, burst, oil aging | Carbon black not below 2.0% when regrind is used |
| Offshore flexible pipes | API 17J, ISO 13628-2, NORSOK M-710 | Rapid gas decompression, methanol aging | H₂S partial pressure above 0.1 bar requires additional validation |
| Cable sheathing | IEC 60811-404, IEC 60754-2 | Oil immersion, halogen acid gas, smoke density | Halogen-free; no amine-based flame retardant package |
For offshore control umbilicals, the black-pigmented P126 T6L grade is applied as a sheathing layer over bundled hydraulic, electrical, and fiber-optic cores. Pressure extrusion is used at wall thicknesses from 1.0 mm to 2.5 mm, with core preheating at 60°C to 80°C to reduce interfacial shrink stress and prevent jacket delamination from steel wire or aramid strength members. Line speed is set to allow a water bath residence time sufficient for the jacket surface to fall below 60°C before the product enters the caterpillar haul-off, because hot-crush marking from the haul-off pads creates localized wall thinning. The resulting sheath is tested for oil resistance according to IEC 60811-404, halogen acid gas emission according to IEC 60754-2, and smoke density according to IEC 61034-2 when the umbilical is specified for enclosed or safety-critical environments. The compound is not a flame-retardant grade; where fire performance is required in vertical riser sections, the PA11 jacket must be over-wrapped with intumescent tape or protected by a steel outer tube. The terminal products are static subsea control cables, dynamic riser umbilicals, and topside connection cables exposed to salt spray, mineral oil, and intermittent UV radiation.
Rail pneumatic control tubing manufactured from Rilsan BESN BLACK P126 T6L meets the dimensional and low-temperature flexibility demands of brake control circuits, but flame spread and toxic fume compliance is not intrinsic to the polymer and must be verified at system level. Extruded tube from 4 mm × 2 mm to 10 mm × 8 mm is held to an internal diameter tolerance of ±0.05 mm and then annealed at 110°C for 30 min to relieve molecular orientation that would otherwise cause buckling at pneumatic fittings. PA11 is halogen-free; testing according to IEC 60754-2 indicates no significant hydrogen chloride evolution, and smoke density per IEC 61034-2 is system-dependent because of the black pigmentation and wall thickness. The material has no built-in flame retardant; therefore EN 45545-2 hazard level assessment includes the finished tube assembly, adjacent connectors, and mounting position. Dry-blending the grade with amine-based flame retardants is not advised because amine migration accelerates surface cracking after repeated flexing. Oil mist in the pneumatic circuit can extract small amounts of plasticizer over time; the tube must be tested after 168 h oil aging at 100°C according to ISO 1817 when compressor oil compatibility is specified. Terminal components are rail brake control tubes, door actuator lines, and shock absorber air lines on metro and mainline vehicles.
Buried gas distribution pipe extruded from Rilsan BESN BLACK P126 T6L is designed using the long-term hydrostatic strength at 20°C and 60°C, with service life prediction based on regression data according to ISO 9080. PA11 pipes are produced in SDR 11 and SDR 17 dimensions with outer diameters from 20 mm to 315 mm; the black compound is specified for outdoor storage because the carbon black package prevents UV embrittlement of the pipe surface prior to burial. Extrusion uses a grooved feed extruder with die head temperatures between 230°C and 250°C, and the melt is vacuum-sized rather than pressure-sized to preserve roundness under ground load. Socket fusion and electrofusion joining are performed according to ISO 16486-5; the fusion bead width on a 32 mm pipe should be controlled to 1.0 mm to 1.5 mm because excessive melt squeeze-out reduces wall thickness at the joint root. Gas utility qualifications reference ISO 16486-1, ISO 16486-2, and ISO 16486-3 for pipe, fittings, and system performance; long-term resistance to rapid crack propagation is evaluated by small-scale steady state testing. PA11 is not a fire-rated material in above-grade building risers, so above-ground transitions should be encased in steel conduit where building codes require non-combustible installation. Published data for this specific configuration is limited, and project-specific hydrostatic regression tests should be commissioned when the design temperature exceeds 40°C.
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Arkema Rilsan BESN BLACK P126 T6L PA11 is a black-pigmented, semi-crystalline polyamide 11 compound supplied in pellet form for melt extrusion and injection conversion. The base polymer is synthesised from 11-aminoundecanoic acid; its odd-carbon backbone places one amide group per 11 methylene units, which reduces hydrogen-bond density compared with PA6 and shifts the property profile toward lower water uptake, lower density, and higher ductility. The BESN designation is applied to extrusion-oriented PA11 rheology, while the black P126 colour designation and T6L suffix identify the carbon-black pigment, internal lubricant, and thermal stabiliser package. Published grade-specific release data for the exact P126 T6L black configuration are limited; the representative values in this document reflect unfilled PA11 extrusion compounds and are to be confirmed against the current Arkema technical datasheet and lot certificate.
Representative physical and mechanical data for unfilled PA11 extrusion compounds measured on dry-as-moulded specimens after conditioning at 23 °C and 50 % relative humidity according to ISO 291 are given in Table 1. Tensile stress at yield is commonly reported between 45 MPa and 48 MPa under ISO 527-2, while elongation at break exceeds 200 %. These values bracket the mechanical response of the base polymer; the black pigment and internal lubricant typically shift elongation and impact slightly without changing the crystallinity level to a degree that invalidates process design calculations. The melting endotherm by differential scanning calorimetry according to ISO 11357-3 falls between 188 °C and 192 °C, and the density is reported in the range 1.03 g/cm³ to 1.05 g/cm³ under ISO 1183-1.
| Property | Test method | Representative value |
|---|---|---|
| Density | ISO 1183-1 | 1.03–1.05 g/cm³ |
| Tensile stress at yield | ISO 527-2 | 45–48 MPa |
| Nominal tensile strain at break | ISO 527-2 | >200 % |
| Flexural modulus | ISO 178 | 900–1300 MPa |
| Charpy unnotched impact at 23 °C | ISO 179-1/1eU | NB |
| Melting temperature | ISO 11357-3 | 188–192 °C |
| Moisture absorption at saturation in water at 23 °C | ISO 62 | 1.8–2.5 wt% |
Moisture control is the primary boundary condition before melt conversion. At a shop-floor relative humidity above 60 %, opened pellets adsorb water rapidly because the amide linkage is hygroscopic; if the moisture content exceeds 0.10 wt%, hydrolysis during melt residence causes bubble formation, surface roughness, and loss of tensile elongation. Pre-drying in a dehumidifying desiccant-bed dryer at 80–90 °C for 4–6 h is required to reduce residual moisture below 0.08 wt%. The dried material is transferred through a closed conveying system or blanketed hopper with dry air at a dew point below -40 °C. Production-scale extrusion of PA11 tubing has shown that insufficiently dried pellets produce visible ovality and micro-voids in the inner tube wall under a 3:1 compression-ratio single-screw extruder; the failure is indistinguishable from low melt-temperature surface defects but is corrected by extending dryer residence time without increasing barrel temperature.
Single-screw extruders with 24:1 to 30:1 L/D and compression ratios between 3:1 and 3.5:1 are used for tube and profile conversion. Barrel settings typically start at 220 °C in the feed zone, rise to 240–250 °C in the compression section, and hold at 250–260 °C at the die. Melt pressure varies from 10 MPa to 35 MPa depending on die diameter, wall thickness, and screw speed; screen packs with 60/100/60 mesh configuration are placed before the breaker plate to trap pigment agglomerates and increase back pressure. Above 280 °C, the melt viscosity falls sharply, the extrudate develops yellowing, and the black pigment can generate surface pitting from oxidative degradation; therefore, barrel override alarms are set at 285 °C.
For injection moulding conversion, melt temperature is maintained between 240 °C and 270 °C, while mould temperature is controlled at 20–60 °C. A back pressure of 2–5 MPa and screw decompression after plasticating reduce air entrapment; residence time at melt temperature should not exceed 10 min. In thick sections above 4 mm, cooling time is governed by the crystallisation plateau at approximately 158–162 °C; ejection occurs after the part core has cooled below 90 °C to avoid post-mould shrinkage. The T6L lubrication package reduces screw torque and melt-pressure fluctuation in injection conversion but does not eliminate the need for a correctly profiled non-return valve of free-flow design.
For automotive air-brake and pneumatic control tubing, the material is converted into polyamide tubes evaluated against SAE J844 and ISO 7628. The low equilibrium moisture uptake of PA11 relative to PA6 limits dimensional change in humid under-chassis service; tubes with outside diameters between 4 mm and 16 mm are produced on vacuum calibration lines with a water bath temperature kept below 30 °C. In truck and trailer air-hose installations, the grade is specified for spiral-coiled assemblies because it retains burst strength after repeated flexing and exhibits resistance to road de-icing salt solutions. In cable sheathing and optical-fibre buffer tubes, black-pigmented PA11 is selected for cut resistance, low-temperature impact, and reduced water ingress; conversion requires the same moisture limits and a downstream air wipe to avoid residual surface water before cooling screens.
In offshore flexible pipe pressure sheaths, extrusion grades of PA11 have been used because the polymer combines methane permeability control with resistance to sour service fluids. The BESN black grade may be considered only when the operating temperature and fluid composition are verified against the current Arkema material selection guide; published data for this specific configuration in high-pressure flexible pipe is limited. Qualification of the pressure sheath requires full-scale testing under API 17J procedures rather than coupon-level immersion.
Immersion resistance in diesel, biodiesel blends, and motor oil should be evaluated using ISO 1817 at the intended service temperature because swelling is time-dependent and reduces tensile modulus below dry-as-moulded values. The material is not recommended for continuous service with hot chlorinated water above 80 °C, strong mineral acids below pH 2, or strong caustic solutions above pH 12, because amide hydrolysis proceeds at a measurable rate. Zinc chloride brines can induce stress-cracking in polyamides; PA11 is less sensitive than PA6 because the lower amide density reduces solvent interaction at the crystalline surface. Methanol-gasoline blends above 15 % alcohol by volume at temperatures above 60 °C require immersion testing under the intended hoop stress, because published data for this exact P126 T6L black grade are limited.
When compared with PA12 and PA6, the differentiating variable is amide group density. PA11 places one amide group per 11 carbon atoms, PA12 one per 12, and PA6 one per 6. The higher amide density in PA6 produces higher tensile and flexural modulus but also saturation moisture uptake above 8 wt%, which drives dimensional change and reduces electrical insulation performance. Table 2 summarises representative dry-as-moulded ranges.
| Property | PA11 | PA12 | PA6 |
|---|---|---|---|
| Density, ISO 1183-1 | 1.03–1.05 g/cm³ | 1.01–1.03 g/cm³ | 1.12–1.14 g/cm³ |
| Melting temperature, ISO 11357-3 | 188–192 °C | 175–180 °C | 220–225 °C |
| Saturation moisture, ISO 62 | 1.8–2.5 wt% | 1.5–2.0 wt% | 8–10 wt% |
| Flexural modulus, ISO 178 | 900–1300 MPa | 700–1000 MPa | 2400–3000 MPa |
Regulatory status is application-specific because the final fabricated article, not the pellet, is assessed. PA11 may be referenced against FDA 21 CFR 177.1500 and EU Regulation 10/2011 for food-contact use, but the black pigment package and processing aids in this colour designation require separate verification. Electrical and drinking-water components may require testing under NSF 61, KTW, or local approval schemes. The base resin is expected to comply with Directive 2011/65/EU Annex II and REACH Article 33 SVHC communication at the lot level; converters are advised to request a compliance statement for the specific production site because pigment dispersion and lubricant composition can affect the extractable fraction.
Thermogravimetric analysis of unfilled PA11 under nitrogen indicates that decomposition onset occurs above 350 °C, but melt processing limits are set much lower because oxidative degradation and shear heating reduce molecular weight before bulk weight loss is detected. At melt temperatures above 280 °C, the melt begins to yellow, form acrid odour, and lose extrudate strength as the amide chain scissions; residence time should be minimised and oxygen exclusion in the hopper maintained. In hot-runner injection tooling, internal runner temperatures must not exceed 280 °C, and dead spots should be eliminated because localised stagnation leads to black specks in light-coloured regrind streams. Regrind loading is limited to 20 % by weight unless otherwise validated by tensile and impact testing according to ISO 527-2 and ISO 179-1.
Avoid melt blending with polyoxymethylene; amide degradation products can prematurely catalyse acetal hydrolysis. Storage in sealed, moisture-proof packaging is required; opened containers should be re-sealed with desiccant and processed within 24 h at ambient relative humidity above 60 %. The processing envelope is bounded by moisture below 0.08 wt%, melt temperature 240–270 °C, and oxygen exclusion; outside these limits, lot-to-lot variance in melt viscosity may shift die pressure by ±8 % and should be monitored at the gear pump inlet.
