| HS Code | 930591 |
| Density | 1.01 g/cm³ |
| Melting Point | 178 °C |
| Tensile Modulus | 1400 MPa |
| Tensile Stress At Yield | 45 MPa |
| Tensile Strain At Yield | 5% |
| Elongation At Break | >50% |
| Charpy Impact Strength Notched 23 C | 9 kJ/m² |
| Shore D Hardness | 72 |
| Water Absorption 24 H | 0.2% |
| Viscosity Number | 90 cm³/g |
| Mvr 275 C 5 Kg | 180 cm³/10 min |
| Flexural Modulus | 1300 MPa |
As an accredited Evonik Vestamid L2141 Black Nylon 12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Evonik Vestamid L2141 Black Nylon 12 is supplied as black granules in 25 kg moisture-proof sealed bags. |
| Container Loading (20′ FCL) | 20′ FCL shipment of Evonik Vestamid L2141 Black Nylon 12, securely palletized and packed to ensure safe, efficient transport. |
| Shipping | Evonik Vestamid L2141 Black Nylon 12 ships as a non-hazardous plastic granulate in sealed moisture-barrier bags on pallets. It should be transported in dry, covered containers, protected from humidity, excessive heat, and direct sunlight. Standard freight handling applies; ensure pallets are secured and kept clean to prevent contamination. |
| Storage | Store Evonik Vestamid L2141 Black Nylon 12 in its original sealed packaging to prevent moisture absorption. Keep in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and UV exposure. Ideal storage temperature is below 30°C. Avoid contact with water and humidity. Use within manufacturer’s shelf-life recommendations for optimal performance. |
| Shelf Life | Store dry, cool, and sealed in original packaging. Shelf life is typically 2 years from production date. |
On heavy commercial vehicle assembly lines, coiled air brake tubing made from Evonik Vestamid L2141 black nylon 12 is processed by a 30:1 L/D single-screw extruder equipped with a barrier screw and a melt pump. The resin is dried in a desiccant dryer with a -40°C dew point to a residual moisture content below 0.10 wt%, because nylon 12 undergoes hydrolysis at processing temperatures if moisture exceeds 0.15 wt%; this produces surface splay and a measurable loss in notched Charpy impact energy measured per ISO 179-1. The compound is fed without additional carbon black masterbatch; the black coloration is part of the delivered pellet batch, and the addition ratio is 100 phr virgin resin. If closed-loop regrind is used on the line, the blend is limited to 15 wt% regrind to avoid lot-to-lot shift in viscosity and dimensional grab. A processing aid can be added at 0.05–0.12 phr only when the calibration tank vacuum exceeds -0.4 bar, because higher vacuum transfer may require internal lubrication; this is confirmed by melt pressure fluctuation at the die head remaining below ±1.5%. The extrusion profile passes through a vacuum calibration sleeve at -0.2 to -0.6 bar and enters a chilled water bath at 25–40°C. Melt temperature at the adapter is controlled at 235°C ±5°C; falling below 230°C produces unmelted spherulitic domains and surface micro-cracks during cold winding, while exceeding 245°C accelerates oxidative degradation of the stabilizer package in the carbon black-filled resin. Finished tube outside diameters range from 6 mm to 16 mm, with wall thickness selected to meet ISO 7628-2:2018 burst pressure and cold impact classes. Applicable standards include SAE J844 for nonmetallic air brake system tubing and ISO 7628-2:2018 for performance testing of thermoplastic tubing. SAE J844 test procedures specify cold impact, heat ageing, boil resistance, and burst endurance; dimensional acceptance is determined by micrometer and pin gauge methods. The terminal finished products are reeled air brake tube assemblies in 30 m, 50 m, and 100 m coils, supplied to commercial vehicle OEMs and aftermarket distribution, fitted with push-to-connect connectors per ISO 14743:2020. One operational boundary is that re-coiling at ambient temperatures below 10°C requires a preheated coiling fixture to prevent stress whitening at the seam; another boundary is that the tube must not be exposed to concentrated strong mineral acids or oxidizing cleaning agents, because polyamide 12 is susceptible to acid-catalyzed chain scission at stressed surfaces.
In coextruded multilayer fuel vapor vent tubing, Vestamid L2141 black serves as the outer and inner PA12 layers, with ethylene-vinyl alcohol copolymer as the hydrocarbon permeation barrier. Layer ratio is governed not by a single ideal composition but by minimum EVOH continuity and PA12 adhesion, typically a distribution of 55–65 wt% outer PA12, 5–10 wt% EVOH, 5–10 wt% tie adhesive, and 20–30 wt% inner PA12. In a representative 8 mm outside diameter tube with 1.0 mm wall thickness, the outer PA12 layer is 0.45–0.55 mm, the EVOH layer 0.08 mm, the adhesive layer 0.07 mm, and the inner PA12 layer 0.35–0.40 mm. The 0.08 mm EVOH layer is maintained above its critical draw limit because layer thinning below 0.05 mm produces pinholes detected by permeation testing. Coextrusion runs on three or four independently heated 25:1 L/D single-screw extruders, each fitted with a melt pump and screen pack; the PA12 extruder melt temperature is held at 235–245°C, while the EVOH extruder is limited to 220–230°C to avoid gel formation. The PA12 lot melt volume-flow rate is certified per ISO 1133-1:2022, and the ratio to the tie resin is controlled within 1.2:1 to 1.5:1 to prevent interfacial waviness during start-up. The combined polymers pass through a spiral mandrel die with separate layer distribution and then into a vacuum sizing tank at -0.3 bar and a water bath at 30°C. Compliance is evaluated under SAE J2260 for nonmetallic fuel system tubing, with tensile testing per ASTM D638-14 on annular specimens and dimensional stability per ISO 3126. The terminal finished products are 8 mm, 10 mm, and 12 mm outside diameter fuel vapor vent lines and evaporative emission return tubes connecting tank rollover valves to carbon canisters. An operational boundary applies to regrind: trims of coextruded multilayer tube must not be fed back into the EVOH layer; mixed regrind is limited to the PA12 outer layer at a 10 wt% maximum to avoid barrier layer contamination.
Industrial pneumatic control lines extruded from Vestamid L2141 black are specified where low moisture absorption and dimensional stability under compressed air temperature cycles prevent fitting blow-off. The compound is processed with 100 phr resin, dried to <0.10 wt% moisture using a desiccant dryer at 80°C for 4–6 h. Tube drawing is conducted on a single-screw extruder with 25:1 L/D and a vacuum sizing die, producing outside diameters from 4 mm to 8 mm with diameter tolerance ±0.05 mm. Melt temperature at the die is maintained at 230–240°C. The tube is tested to ISO 14743:2020 for push-in connector retention after thermal cycling from -20°C to 80°C; pneumatic system design follows ISO 4414:2010. Material restriction documentation is supplied under REACH (EC) No 1907/2006 and RoHS Directive 2011/65/EU. Finished products are 200 m coils of UV-resistant black polyamide tubing for machine pneumatic controls, solenoid valve banks, and compressed air distribution in robotics. One limitation is that neat Vestamid L2141 black is not rated for continuous exposure to phosphate ester fire-resistant hydraulic fluids; for such fluids, published compatibility data for this specific grade are limited, and dynamic seal testing is required.
On dynamically loaded offshore control cables, a Vestamid L2141 black sheath is applied by pressure extrusion over a galvanized steel wire or polyester inner bedding. The compound is dried to a residual moisture content below 0.08 wt% before feeding to a 90 mm single-screw extruder with a 25:1 L/D ratio and a crosshead die. Melt temperature at the crosshead is controlled at 235°C ±5°C; the die is positioned upstream of a 40°C water trough to avoid pre-cooling of the melt cone. The sheath wall thickness for a 16 mm diameter cable is commonly specified at a minimum 1.2 mm to withstand abrasion and low-temperature impact; wall thickness is monitored with an X-ray diameter gauge. The formulation is 100 phr Vestamid L2141 black, without external pigment, because the carbon black integrated into the grade provides UV stabilization and uniform surface resistivity. If environmental stress cracking resistance must be increased, a 5–10 wt% plasticizer masterbatch is not recommended without generator approval, since plasticizer migration into adjacent jacket materials can shift shore hardness and alter clamp retention. The cable is subjected to AC spark testing after extrusion, followed by cold bend testing at -40°C per IEC 60811-501. Compliance for shipboard and offshore use is assessed against IEC 60092-359 for sheathing materials, with thermal ageing according to IEC 60811-401. For specific deepwater projects requiring NEK 606 hydrocarbon immersion, published data for this exact black PA12 grade are limited, and qualification testing on the full cable is required before project acceptance. The terminal finished products are subsea control cable jackets, shipboard automation cables, and offshore instrument cables with harness terminations. A processing boundary is that moisture content above 0.10 wt% leads to die-lip build-up and sheath surface pores; a second boundary is that the sheath must not be exposed to concentrated sulfuric acid cleanup agents because polyamide 12 is susceptible to acid hydrolysis at weld locations.
Vestamid L2141 black is processed by injection molding where low moisture absorption and impact resistance at -40°C are required for cable ties, harness clips, and diesel tank fastener brackets. The pellet is dried at 80°C for 4 h to <0.08 wt% moisture. The screw L/D ratio is 20:1; melt temperature is 240–260°C, and mold temperature is 50–60°C. Production-scale behavior shows that a mold temperature below 40°C results in visible flow lines and lower gate impact strength, while a mold temperature above 70°C increases cycle time without improving clamping force retention. The formulation is 100 phr virgin resin; if regrind is used, the maximum proportion is 10 wt%; no additional carbon black is introduced. Clamp force settings for a 64-cavity cable tie mold are determined by cavity pressure transducers, with holding pressure 60–80 MPa. Terminal products are IEC 62275-compliant cable ties and automotive wire harness clips. One limitation is that continuous exposure to engine bay temperatures above 120°C may cause nylon 12 to lose clamp retention over 3,000 h; published data for this specific black grade at those soak times are limited.
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Evonik Vestamid L2141 Black is an unreinforced polyamide 12 (PA12) injection-molding and extrusion grade supplied in black. The base resin is classified under ISO 1043-1 as PA12 and is produced from laurolactam. Typical density is 1.01 g/cm³ when tested to ISO 1183-1:2019. The black pigmentation is obtained by carbon black addition, which is used for UV screening and uniform part appearance. The grade is specified where low moisture uptake, high impact toughness, and resistance to aliphatic fuels and oils are required. In dry-as-molded test pieces, tensile modulus is commonly reported near 1,400 MPa per ISO 527-2, with yield stress near 45 MPa and nominal strain at break values in supplier literature often exceeding 100 %. Published data for the black precompounded variant can vary by lot and specimen preparation, especially after conditioning at 23 °C and 50 % relative humidity.
For injection molding and extrusion, the melt is processed above the DSC melting peak of approximately 176 °C to 180 °C measured by ISO 11357-3. Recommended melt temperatures for unreinforced PA12 typically fall between 220 °C and 250 °C. The melt exhibits shear-thinning behavior. The grade can fill thin-wall and multi-cavity injection molds, but residence time at the upper end of the processing window must be controlled to avoid oxidative yellowing and chain scission. On a 40:1 L/D twin-screw compounding line, specific mechanical energy input and barrel residence time are controlled to avoid thermal-oxidative degradation. Mold temperature should be maintained between 40 °C and 80 °C to promote uniform crystallization. Mold temperatures below 30 °C can produce a frozen-in amorphous fraction and increase post-mold shrinkage, while mold temperatures above 80 °C extend cycle time without proportional rigidity gain. The crystallization peak on cooling is normally observed between 145 °C and 155 °C at 10 °C/min. Melt temperatures above 250 °C can cause local viscosity shifts and surface roughness in carbon-black-containing PA12.
Moisture control before melt processing is critical because PA12 may carry 0.7–1.0 wt% equilibrium moisture at 23 °C and 50 % RH. The compound should be dried to a maximum residual moisture of 0.1 wt% using a desiccant dryer with a dew point of -30 °C or lower. Supplier recommendations for unreinforced PA12 commonly specify 80 °C for 4–12 h, with actual drying time dependent on granule bed depth and initial moisture condition. Hydrolysis in the melt is less severe than in PA6 or PA66 because the amide group concentration is lower; however, residual moisture above 0.15 wt% can produce splay, surface silver streaks, and viscosity loss. On production-scale single-screw extruders with grooved feed sections and 25:1 L/D, open storage of the black compound at relative humidity above 60 % has led to intermittent surging in the metering zone unless dry-air hopper purging is used. Contact with strong acids and oxidizing agents should be avoided because accelerated hydrolysis and thermo-oxidative chain scission can occur at elevated processing temperatures.
Crystallization kinetics in unreinforced PA12 create a mold shrinkage window that is narrower than polyolefins but wider than glass-filled PA12. In production-scale injection molding of L2141 Black, cavity pressure sensors and holding pressure profiles are used to compensate for semicrystalline volume reduction during cooling. Shrinkage values determined by ISO 294-4 for unreinforced PA12 are commonly reported in the range of 0.7 % to 1.1 % along the flow direction and 0.8 % to 1.2 % transverse to flow. Carbon black pigmentation may raise surface temperature under infrared heating by 5 °C to 10 °C in pre-drying hoppers using infrared lamps; published data for this specific grade is limited. Dimensional tolerance capability is process-dependent, and tooling should be designed with gate location and weld-line placement fixed before production shrinkage trials. For parts with wall thickness changes from 1 mm to 3 mm, holding pressure is typically increased by approximately 20 % to maintain sink-free surfaces at thick bosses.
Compared with glass-fiber-reinforced PA12, L2141 Black has lower tensile modulus but higher elongation at break. A 15 wt% glass-fiber PA12 grade can show tensile modulus of 3,000–4,000 MPa and nominal strain at break below 10 %, while unreinforced PA12 retains nominal strain at break above 50 % in the dry state. This difference determines part design: unreinforced L2141 Black is used for snap-fit clips, flexible conduits, cable ties, and connectors requiring high recovery after deflection, whereas glass-fiber grades are selected for load-bearing housings and brackets. Weld-line strength in reinforced PA12 is more sensitive to fiber orientation and can fall to 50–70 % of parent tensile strength. Unreinforced L2141 Black weld lines retain a higher fraction of tensile strength because the matrix is unfilled. However, the unreinforced grade has higher mold shrinkage, lower creep modulus, and greater thermal expansion. Long-term creep comparisons at 60 °C show unreinforced PA12 may creep more than glass-filled PA12 by a factor of two or more; supplier creep curves generated to ISO 899-1 should be consulted for L2141 Black.
Mechanical property testing of L2141 Black must distinguish between dry-as-molded and conditioned states. PA12 absorbs water more slowly than PA6 and PA66. Equilibrium moisture at 23 °C and 50 % RH is commonly 0.7–1.0 wt%, while PA6 may reach 2.5–3.0 wt%. Absorbed water plasticizes the amorphous regions and reduces tensile modulus and yield stress. For unreinforced PA12, tensile modulus in the dry-as-molded state is near 1,400 MPa and can drop by 15–25 % after equilibration at 50 % RH. Notched Charpy impact testing to ISO 179-1/1eA at 23 °C usually reports values in the range 5–8 kJ/m² for unreinforced PA12. At -30 °C, values may be lower but often remain above 4 kJ/m². This is a practical difference from PA6 and PA66, where sub-zero impact values can be lower and moisture-conditioned dimensions less stable. Carbon black aggregates can act as stress concentrations under high-speed puncture; published data for L2141 Black under ISO 6603-2 puncture conditions is limited.
The property differences shown below are typical supplier-literature ranges for unreinforced, dry-as-molded and conditioned nylon grades. They are not a substitute for a certificate of analysis for a specific L2141 Black lot.
| Parameter | Test method | PA12 L2141 Black typical | PA6 unreinforced | PA66 unreinforced |
|---|---|---|---|---|
| Density | ISO 1183-1:2019 | 1.01 g/cm³ | 1.13 g/cm³ | 1.14 g/cm³ |
| Equilibrium moisture at 23 °C, 50 % RH | ISO 62:2008 | 0.7–1.0 wt% | 2.5–3.0 wt% | 2.0–2.5 wt% |
| Tensile modulus, dry as molded | ISO 527-2 | 1,300–1,500 MPa | 2,600–3,000 MPa | 2,800–3,300 MPa |
| Notched Charpy impact, 23 °C | ISO 179-1/1eA | 5–8 kJ/m² or partial break | 4–6 kJ/m² | 5–7 kJ/m² |
In fuel-line applications, the low equilibrium moisture uptake of PA12 and its resistance to aliphatic motor fuels make L2141 Black a candidate for outer layers, connectors, and non-conductive liners. Fuel permeation is governed by the amorphous phase, so higher crystallinity and lower moisture content reduce volatile hydrocarbon migration. Fuel C swelling of unreinforced PA12 is typically below 3 % by mass at 23 °C per ISO 1817. Dimensional change can be less than 1 % in stabilized grades after re-drying. The melting point of approximately 176 °C permits higher service temperatures than polyolefins, but unstabilized PA12 fuel lines are not intended for continuous exposure above 100 °C in air without oxidative stabilizers. In multi-layer coextrusion, 24:1 L/D polyamide barrier screws are used to combine outer PA12 layers with inner conductive PA12 or other barrier layers. L2141 Black may serve as the non-conductive or outer layer because carbon black may not provide sufficient surface resistivity. For electrostatic dissipation applications, a dedicated conductive carbon black or carbon nanotube PA12 compound should be used.
Pneumatic tube extrusion trials on single-screw lines with polyamide barrier screws typically specify a barrel profile from 200 °C in the feed zone to 230 °C at the die. Calibration in a vacuum tank with -0.5 bar to -0.8 bar and a water temperature of 20–40 °C is used to maintain outside diameter and ovality. The melt viscosity of L2141 Black can create die drool if die land length is too short or if melt temperature exceeds 250 °C. Production-scale feedback indicates that purging with a viscous polyolefin at shutdown reduces black specks during restart. Flexible cable conduit and clip-on fasteners also use this material; its lower moisture uptake prevents the dimensional growth and loosening observed in PA6 components after exposure to humid air.
Carbon black compounding in L2141 Black alters outdoor weathering response by screening UV radiation. Prolonged xenon-arc weathering under ISO 4892-2 shows better color retention and surface morphology retention than natural PA12, but the black surface can heat under solar load. In cable conduits and connector bodies, the material has higher volume resistivity than conductive PA12 and should not be specified where electrostatic dissipation below 10⁶ Ω/sq is required. Surface resistivity testing should be performed to IEC 62631-3-2 or an equivalent condition-specific method because carbon black dispersion and moisture condition affect measured values.
Compliance screening for automotive fuel-contact and industrial pneumatic components typically references the following standards. The table does not constitute a supplier certification; it identifies test methods commonly requested for unreinforced PA12 grades.
| Requirement | Standard or method | Typical use in specification |
|---|---|---|
| Designation and marking | ISO 1043-1, ISO 11469 | PA12 identification on molded parts |
| Density | ISO 1183-1:2019 | Material density and part mass verification |
| Tensile properties | ISO 527-2:2012 | Yield stress, elongation, modulus |
| Impact resistance | ISO 179-1/1eA | Notched Charpy at 23 °C and -30 °C |
| Moisture absorption | ISO 62:2008 | Dimensional stability assessment |
| Fluid resistance | ISO 1817, ISO 175 | Fuel, oil, and chemical exposure |
| Heat deflection temperature | ISO 75-2 | Thermomechanical specification |
For food-contact, drinking-water, or pharmaceutical applications, the suitability of a black precompounded PA12 must be verified against the applicable regional positive list, such as FDA 21 CFR 177.1500 for nylon resins, EU 10/2011 migration limits, or USP <661.1> for packaging components. The carbon black pigment may be subject to separate purity criteria. Published data for Vestamid L2141 Black in these exact regulatory configurations is limited and must be confirmed with Evonik.
