| HS Code | 909004 |
| Density | 1.03 g/cm³ |
| Melting Point | 189 °C |
| Vicat Softening Temperature | 80 °C |
| Tensile Strength At Break | 38 MPa |
| Elongation At Break | 300 % |
| Flexural Modulus | 600 MPa |
| Izod Impact Strength Notched 23 C | No break |
| Shore D Hardness | 64 |
| Water Absorption 24h At 23 C | 0.4 % |
| Surface Resistivity | 1×10⁶ Ω/sq |
| Volume Resistivity | 1×10⁵ Ω·cm |
| Melt Volume Rate 235 C 2 16 Kg | 7 cm³/10min |
As an accredited Arkema Rilsan BESN BLACK P212 CTL PA11-I-CD factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | The chemical is packaged as a 20 kg sealed cardboard box containing fine black Arkema PA11 powder for laser sintering. |
| Container Loading (20′ FCL) | 20′ FCL container loading of Arkema Rilsan BESN BLACK P212 CTL PA11-I-CD, ensuring secure, dry, and stable transport. |
| Shipping | Ship Arkema Rilsan BESN BLACK P212 CTL PA11-I-CD as non-hazardous powder in sealed, moisture-proof packaging. Keep dry, cool, and away from direct sunlight. Use standard ground or air freight; no special DG classification required. Avoid prolonged storage in humid conditions to preserve material performance. |
| Storage | Store Rilsan BESN BLACK P212 CTL PA11 in its original, unopened packaging in a cool, dry, well-ventilated area. Keep away from direct sunlight, heat sources, moisture, and oxidizing agents. Maintain moderate temperatures and low humidity to prevent degradation. Ensure containers are sealed when not in use. Under these conditions, shelf life is typically 1–2 years. |
| Shelf Life | Shelf life is typically 2 years from manufacture date when stored unopened in original packaging, in a cool, dry place. |
In unbonded flexible pipe pressure sheaths, Arkema Rilsan BESN BLACK P212 CTL PA11-I-CD is extruded as the primary melt-processed layer without secondary carbon-black dilution. The formulation approach treats the compound as a 100 parts-by-weight base resin; clean start-up purgings and edge trim generated in-line may be re-fed up to 15 wt% only when the API 17J-qualified lay-up has shown no statistically significant loss in elongation at break after ageing under condensed acidic water. Pre-drying is run at 80–90 °C for 4–6 h using a desiccant dryer with a dew point below -40 °C; the maximum residual moisture target is 0.08 wt% as measured by Karl Fischer titration following ISO 15512:2016. Extrusion equipment for unbonded flexible pipe liner tube is configured as a single-screw extruder with a 30:1 L/D barrier screw, a vacuum-vented barrel in zone 5, a static mixer before the melt pump, and a multi-zone die with temperatures from 235 °C to 255 °C; if zone 4 drops below 225 °C, melt fracture appears on the inner sheath wall, while sustained zone temperatures above 260 °C produce oxidative gel specks that fail the manufacturer's optical inspection. Melt-pressure variation is held within ±2.5 bar at the die inlet to prevent wall-thickness chatter, and the crosshead die is designed with a land length that keeps shear rate below the critical value for sharkskin onset at the grade's melt viscosity. Terminal products are unbonded flexible risers, flowlines, and jumpers qualified to API 17J, ISO 13628-2:2006, and API 17TR2; operational limits are set by the pressure-sheath ageing model, not by the extrusion line alone.
In compressed-air distribution, the material is used as the base polymer for monolayer spiral tubing because the pre-dispersed black stabilisation package removes the need for in-line colour dosing. The compounding ratio for monolayer tube is 100 wt% of Rilsan BESN BLACK P212 CTL PA11-I-CD; if a closed-loop regrind stream is unavoidable, clean start-up and changeover scrap is limited to 20 wt%, and it is dried to the same 0.08 wt% moisture limit before re-extrusion. Dimensional and fitting-retention conformity for industrial pneumatic products is checked against ISO 14743:2004 for push-in connector port geometry and ISO 6358-2:2019 for flow-rate characterisation of tubing sub-assemblies; production acceptance testing additionally applies a 2.5× nominal working-pressure burst test at 23 °C and 60 °C. Extrusion lines for 4–16 mm outside-diameter tube use a 25–60 mm single-screw extruder with a 30:1 L/D mixing screw, barrel set points from 230 °C to 250 °C, die at 235 °C, vacuum calibration at -0.2 bar to -0.6 bar gauge, and a two-stage cooling bath maintained at 15–40 °C; the haul-off speed is trimmed to maintain OD within ±0.08 mm. Terminal goods are push-in pneumatic lines, self-retracting spiral assemblies, multi-tube bundles, and robotic dress-pack conduits.
Truck and bus pneumatic braking circuits consume Rilsan BESN BLACK P212 CTL PA11-I-CD in monolayer and coextruded thermoplastic tubes that must survive cold impact during winter start-up and hot-soak ageing in engine bays. The extrusion formulation uses 100 wt% of the delivered compound; skeletal scrap from start-up, colour change, or dimensional adjustment is limited to 10 wt% in closed-loop return for air-brake tube, because higher regrind fractions can shift ovality and reduce cold-impact pass rates. Qualification is performed under ISO 7628-1:2018 for thermoplastic air-brake tubing, with vehicle-level certification tracks to SAE J844 and FMVSS 571.106; low-temperature impact, heat ageing, and zinc-chloride resistance tests are performed on production-conditioned tube, not on press-moulded plaques. The production process for 6–12 mm OD, 1.0–1.5 mm wall tube uses a 45 mm single-screw extruder with 30:1 L/D, vacuum-vented barrel, barrel temperatures 220–245 °C, head and die at 225–240 °C, and a double-stage vacuum calibrator at -0.4 bar gauge; haul-off speed is 40–80 m/min, and cut-length winders produce 25–100 m coils. Terminal products include pre-formed spiral air lines, straight chassis lines, and fuel-tank vent tubes.
Railway cable jacket production using Rilsan BESN BLACK P212 CTL PA11-I-CD places the material as the mechanically tough base resin in flame-retarded sheath formulations rather than as a ready-to-use fire-rated jacket. Compounding formulations for EN 45545-2 programmes typically incorporate 80–100 phr of PA11-I-CD with 0–20 phr of a phosphorus-nitrogen or intumescent masterbatch; the exact ratio must be re-qualified for each cable geometric configuration because the base grade alone does not constitute an EN 45545-2 classified compound. The halogen-free character of PA11 assists compliance with EN 50267-2-2 gas-acidity limits, while mechanical assessment is carried out to EN 50264-1 and IEC 60811-401; fire-smoke and toxicity testing is performed on the finished cable according to EN 45545-2 hazard-level requirements. Sheath extrusion is conducted on a 60 mm single-screw extruder with a 30:1 L/D polyamide-optimised screw, a 40/60/40 mesh breaker plate, and melt temperatures of 225–245 °C; the cable core is preheated to 60–80 °C before entering the crosshead die, and the crosshead pressure is held at 80–120 bar to control concentricity. The water trough is staged at 20 °C followed by 40 °C to reduce dimensional recovery; line speed is set to maintain a cooling time of 20–60 s before capstan pull. In multi-layer rail jackets, the black P212 CTL-grade sheath is typically co-extruded over a buffer layer rather than applied directly to the conductor insulation, which reduces melt-temperature damage to the insulation and improves tear propagation resistance. Terminal products are bogie wiring, inter-car jumper cables, and HVAC control cables.
Injection moulding of high-retention cable ties uses Rilsan BESN BLACK P212 CTL PA11-I-CD as the pre-coloured, UV-stabilised resin in multi-cavity hot-runner tools where gate packing and latch tooth crystallinity determine working retention. The material is processed at 100 wt%; regrind from sprue, runner, and short shots is limited to 10–15 wt%, pre-dried at 80 °C for 4–6 h, and reintroduced only after reaching 0.08 wt% residual moisture as measured on the hopper inlet. Conformity is documented under IEC 62275:2018 for cable ties and related harness accessories, with flammability classification at UL 94 V-2 at 0.8 mm nominal wall section; latch-retention values are validated on production tooling because fibre orientation and crystallinity at the pawl-rack weld line govern the failure mode between tooth shear and pawl hinge yield. Injection moulding takes place on a 50–120 t clamp-force machine with a 24:1 L/D three-zone screw, barrel temperature profiles of 240–260 °C, nozzle at 250 °C, mould temperature 40–80 °C, holding pressure 50–80 MPa, and screw back pressure 0.5–1.0 MPa; multi-cavity moulds are vented to prevent gas burns and gate blush. Terminal articles are self-locking cable ties, harness clips, torque-limited fasteners, and outdoor electrical installation clips.
In low-voltage connection and sensor enclosures, Rilsan BESN BLACK P212 CTL PA11-I-CD is selected where a single moulded body replaces a separate polyamide shell, cable gland, and mounting bracket, reducing assembly labour and leakage points. The base formulation is 100 wt% of the delivered compound; if demoulding restrictions appear in deep-draw cavity designs, 0.1–0.3 phr of a polyamide-compatible internal release additive may be added, but the upper limit is 0.3 phr because higher levels weaken weld-line strength at snap-fit bosses and interfere with ultrasonic welding. Product conformity is assessed under IEC 60670-1 for enclosures and EN 61984:2009 for connector safety; UV-stabilised outdoor versions are subjected to ISO 4892-2 xenon-arc conditioning for 500 h with colour and gloss retention recorded before dielectric strength testing. The moulding process is specified for a 100–180 t hydraulic injection moulding machine with a 24:1 L/D three-zone screw, reverse-taper nozzle, barrel temperatures 240–260 °C, mould temperature 50–90 °C, and injection speeds that fill the thickest section in 0.8–2.0 s; gas counterpressure is applied to thick bosses to prevent internal voids. Terminal products are industrial sensor bodies, junction-box inserts, fieldbus connector housings, and lid-mounted strain-relief brackets.
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Arkema Rilsan BESN BLACK P212 CTL is supplied as an unfilled polyamide 11 resin identified by the trade designation PA11-I-CD. The PA11 portion of the designation corresponds to polyamide 11 under ISO 1043-1, while the I-CD suffix is an Arkema-specific coding element rather than a standardized ISO descriptor and therefore requires verification against the manufacturer’s technical data sheet. The BESN base designation identifies a standard-viscosity homopolymer in the BES series, and the BLACK P212 CTL segment defines the carbon-black pigmentation package and controlled-lot suffix. The polymer backbone is derived from 11-aminoundecanoic acid sourced from castor oil, placing the material among renewable-carbon polyamides measured by ASTM D6866. This composition produces a lower density than short-chain polyamides and a distinctive balance of chemical resistance, impact retention, and dimensional response.
Table 1 gives the normally reported property envelope for unfilled Rilsan PA11 BESN grades when conditioned according to ISO 291 at 23 °C and 50% relative humidity. Values are typical ranges from supplier-published data and should not be interpreted as simultaneous production minima.
| Property | Test standard | Typical range |
|---|---|---|
| Density | ISO 1183-1 | 1.03–1.05 g/cm³ |
| Melting temperature | ISO 11357-3 | 189–194 °C |
| Tensile modulus | ISO 527-2 | 1,100–1,400 MPa |
| Tensile stress at yield | ISO 527-2 | 44–52 MPa |
| Nominal strain at break | ISO 527-2 | >50% |
| Notched Charpy impact at 23 °C | ISO 179-1/1eA | 5–8 kJ/m² |
| Notched Charpy impact at −30 °C | ISO 179-1/1eA | 4–6 kJ/m² |
| Water absorption at saturation in water at 23 °C | ISO 62 | 1.8–2.0% |
| Volume resistivity | IEC 62631-3-1 | 1012–1014 Ω·m |
| Dielectric strength on 1.0 mm plaque | IEC 60243-1 | 25–30 kV/mm |
Moisture control is the primary processing boundary. The resin must be dried to a residual moisture content below 0.10% before melt processing. A desiccant dryer with an air dew point of −30 °C or lower and a residence time of 4–6 h at 80–90 °C is adequate for closed containers. If the regrind fraction exceeds 25%, drying time should be extended to 6–8 h because granule surface area increases and moisture re-adsorption accelerates. On injection molding lines, a material hopper with dry-air purge is used when ambient relative humidity exceeds 60%.
Barrel temperature profiles from the feed throat to the nozzle are typically set in the range 230–260 °C, with the nozzle held at 245–255 °C. Melt temperature measured by an air-shot pyrometer should not exceed 270 °C; residence time above 280 °C should be kept below 5 min to limit thermal oxidation. The recommended mold temperature is 20–60 °C, with 40–60 °C preferred for thin-wall connectors because slower cooling raises crystallinity and improves dimensional stability.
Extrusion of tubing and cable jacketing uses a single-screw extruder with an L/D ratio of 24:1 to 30:1 and a compression ratio of 2.5:1 to 3.0:1. Screw speed should be adjusted to maintain a melt pressure below 25 MPa and a melt temperature of 230–250 °C at the die. Temperature overshoot at the die above 260 °C causes surface defects and increases gel formation. For pneumatic tubing, a water bath temperature of 20–40 °C is commonly used.
Unfilled PA11 does not exhibit the large moisture-induced modulus shift of PA6 or PA66. At 23 °C and dry-as-molded conditions, tensile modulus values for the BESN base are in the 1,100–1,400 MPa range, and the yield stress is 44–52 MPa. After conditioning at 50% relative humidity, modulus typically declines by 15–25%, while elongation at break increases. The glass transition temperature of PA11 is near 40–50 °C, but the polymer retains toughness below 0 °C because the long aliphatic chain provides sub-Tg mobility. Notched Charpy impact at −30 °C remains in the 4–6 kJ/m² range, which is a key differentiator against short-chain polyamides.
Thermal aging is evaluated under ASTM D3045 and UL 746B where applicable. Continuous-use temperature claims are component-dependent; natural PA11 grades are often rated for long-term service below 90–120 °C, but the black P212 CTL pigment package can shift the oxidative-induction time measured by differential scanning calorimetry. Published data for this specific black configuration is limited, so an end-use thermal aging program per ASTM D3045 is required before specifying sustained exposure above 90 °C in air.
Applications specifying this grade include fuel vapor lines, quick connectors, air-brake tubing, and hydraulic hose sheaths. The polymer is resistant to zinc chloride stress cracking, which is not true for PA6/66 in the same exposure, and it withstands automotive fuel, diesel, biodiesel blends, and salt spray. Fuel permeation performance is determined by wall thickness and test temperature; tube constructions are evaluated under SAE J2260 or SAE J844 for air-brake tubing. The black P212 CTL package provides ultraviolet screening by carbon black, but outdoor weatherability data should be collected under ISO 4892-2 with a xenon arc and a black-standard temperature of 65 °C.
Low-temperature impact retention is specified when components are clamped, crimped, or snapped at assembly. The material maintains notched Charpy impact above 4 kJ/m² at −30 °C, but this value is geometry- and moisture-dependent. Weld-line strength in complex connectors can be 20–30% lower than the base material if the mold temperature is below 40 °C and the melt front temperature at the weld line drops below 240 °C. Mold-filling analysis should be used to position gates so that weld lines are outside snap-fit retention features.
Volume resistivity of unfilled PA11 is in the 1012–1014 Ω·m range under IEC 62631-3-1 at 23 °C and 50% relative humidity, and dielectric strength measured on 1.0 mm plaque specimens is 25–30 kV/mm under IEC 60243-1. These values support use in cable jackets and connector housings where insulation is required, but the carbon-black pigment package may reduce surface resistivity compared with natural PA11. If surface resistivity falls below 109 Ω, the grade should not be used as a primary insulator in critical live-line applications without component-level testing.
Water absorption at saturation is 1.8–2.0% under ISO 62, which is markedly lower than PA6 at 9.0–10.5%. Dimensional change from dry-as-molded to 50% relative humidity equilibrium is less than 0.3% in the flow direction for unfilled PA11. The low moisture uptake reduces hydrolysis in hot-water and glycol service, but continuous exposure to water above 70 °C may plasticize the matrix and reduce tensile modulus.
Regulatory status must be confirmed for the specific black P212 CTL formulation. Natural PA11 homopolymer is often assessed under FDA 21 CFR 177.1500 and EU Regulation No 10/2011 for food-contact use, but the carbon-black and processing-additive package in the pigmented grade can alter migration test results. REACH and Directive 2011/65/EU compliance is supplier-certified for the base polymer, yet a production lot-specific statement is required for global shipment because the black masterbatch can contain restricted metal residues depending on sourcing.
Comparative selection between this PA11 grade, PA12, and PA6/66 is driven by density, moisture uptake, chemical resistance, and subzero toughness. Table 2 gives typical conditioned or dry ranges from supplier-published data; the values are not simultaneous minima.
| Property | Rilsan BESN BLACK P212 CTL PA11 | PA12 unfilled | PA6 conditioned |
|---|---|---|---|
| Density | 1.03–1.05 g/cm³ | 1.01–1.02 g/cm³ | 1.12–1.14 g/cm³ |
| Melting point | 189–194 °C | 176–180 °C | 220–225 °C |
| Saturation water absorption | 1.8–2.0% | 1.5–1.8% | 9.0–10.5% |
| Tensile modulus | 1,100–1,400 MPa | 1,300–1,600 MPa | 900–1,400 MPa |
| Notched Charpy impact at −30 °C | 4–6 kJ/m² | 5–7 kJ/m² | 3–5 kJ/m² |
| Zinc chloride stress-crack resistance | resistant | resistant | limited |
The principal performance difference is heat resistance: PA11 retains mechanical properties at temperatures approximately 10–15 °C higher than PA12. PA12 provides lower density and slightly lower water absorption but is petro-based and often less stiff after plasticization. Compared with PA6, the PA11 grade trades tensile modulus for a substantial reduction in conditioned moisture uptake and improved chemical stress-crack resistance, especially in zinc chloride service. Processors replacing PA12 with PA11 can often retain tooling because the melt temperatures are similar; however, the PA11 material requires a slightly higher barrel set point of 5–10 °C due to its higher melting point. Replacement of PA6 with PA11 typically requires lower melt temperatures but higher mold temperatures to manage crystallization and dimensional control.
The grade is not inherently flame retardant. If a V-0 classification is required under IEC 60695-11-10, an alternative flame-retardant PA11 formulation must be selected.
