| HS Code | 856843 |
| Density | 1.01 g/cm³ |
| Melting Point | 178 °C |
| Glass Transition Temperature | 45 °C |
| Tensile Modulus | 1400 MPa |
| Tensile Strength At Yield | 45 MPa |
| Elongation At Break | 200 % |
| Flexural Modulus | 1300 MPa |
| Charpy Impact Notched | 11 kJ/m² |
| Shore D Hardness | 70 |
| Water Absorption At Saturation | 1.5 % |
As an accredited Evonik Vestamid L2140B nf (dry properties) Nylon 12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Vestamid L2140B NF Nylon 12 is supplied as dry pellets in 25 kg sealed multilayer bags, ready for processing. |
| Container Loading (20′ FCL) | 20′ FCL: Load dry Nylon 12 granules in sealed bags into a standard 20-ft container; secure pallets and ensure ventilation. |
| Shipping | Evonik Vestamid L2140B NF (dry properties) is a nylon 12 grade shipped as non-hazardous pellets. Pack in sealed moisture-barrier bags or drums to prevent moisture absorption. Transport in dry, ventilated containers, avoiding extreme heat and direct sunlight. Handle with standard PPE to minimize dust exposure. |
| Storage | Store Evonik Vestamid L2140B NF in its original, unopened container in a cool, dry, well-ventilated area, ideally below 40°C. Protect from moisture, direct sunlight, and heat sources. After opening, reseal tightly to prevent humidity absorption, which can affect dry properties. Use within recommended shelf life for optimal performance. |
| Shelf Life | Shelf life is typically 2 years when stored sealed, dry, and cool in original packaging; protect from moisture. |
Truck and bus air brake systems produce a combination of high-frequency pneumatic impulse, road salt aerosol, and thermal cycling from -40 °C cold soak to 85 °C under-hood radiant load. Monolayer tubing extruded from Evonik Vestamid L2140B nf is specified where low water uptake and low-temperature impact are required, because PA12 absorbs approximately 1.5% water at saturation per ISO 62, whereas PA6 can exceed 9.0%. The homologation package for this downstream segment references SAE J844 for nonmetallic air brake tubing, ISO 7628 for thermoplastic air brake line requirements, and DIN 73378 for dimensional and burst-pressure qualification of polyamide tubing. Typical compound input on the production floor for a black UV-stabilised air brake tube uses Vestamid L2140B nf as the neat resin, a 35% carbon black PA12 masterbatch added at 4.0 wt% to obtain 1.4 wt% elemental carbon, and a 0.3 wt% antioxidant/processing-stabiliser masterbatch; no additional plasticizer is introduced because the L2140B plasticized system already shows target Shore D hardness of approximately 68–72 per ISO 868 after extrusion. Extrusion is carried out on a single-screw extruder with a 30:1 L/D barrier screw and a grooved feed section, with barrel temperatures held from 210 °C to 230 °C, melt temperature measured at the adapter between 220 °C and 235 °C, die head pressure at 90–150 bar, and vacuum calibration in a 40–60 °C water bath. The processing window is narrow: sustained melt temperature above 240 °C for more than 2 min produces plasticizer volatilisation visible as die lip plate-out and results in ovality greater than 0.15 mm on 8 mm OD tubing, while melt temperature below 210 °C causes unfused melt fracture and burst-pressure scatter above 10% between batches. Manufacturers inspect both cold impact at -40 °C per ISO 7628 and pressure-hold leakage after condensing humidity cycles to prevent field failures in reservoir-to-brake actuator lines. Terminal finished goods include 6 mm, 8 mm and 12 mm OD flexible air brake tubing assemblies with push-in fittings and coiled trailer jumper lines.
Replacement of monomer-residual PVC in rail and automotive cable jacketing is constrained by flame-performance requirements rather than by low-temperature flexibility. Compounds based on Evonik Vestamid L2140B nf are used for sheathing where water absorption, notch resistance and cold-bend performance are decisive, but they are not intrinsically flame-retardant; an outer cable jacket for rolling stock must be evaluated against EN 50363 for thermoplastic sheathing compounds, IEC 60332-1-2 for single-cable flame propagation, EN 45545-2 hazard level requirements when installed in rail vehicles, and IEC 60811-401 for cold-bend performance at -40 °C. A workable formulation for a black halogen-free control cable sheath uses Vestamid L2140B nf as the base, 0.3–0.5 wt% phenolic antioxidant masterbatch, 0.2–0.4 wt% ester wax processing aid, and 1.5–2.0 wt% carbon black masterbatch to achieve UV resistance; if flame retardancy is required, a magnesium dihydrate or zinc borate package must be added at 15–30 wt%, but this addition reduces elongation at break by more than 40% and is often rejected for dynamic trailing cable service. Cable jackets are produced on a single-screw extruder with a 24:1 L/D crosshead line, barrel temperatures from 200 °C to 225 °C, screw cooling by water jacket, melt temperature below 230 °C, and a chilled water bath at 15–25 °C to limit plasticizer migration. The critical process limit is screw speed above 35 rpm, which generates shear heating and results in surface roughness defects that increase electrical insulation test failures; line speed is therefore set between 15 m/min and 35 m/min for cables up to 8.0 mm finished diameter. The end product category includes low-voltage control cable sheathing for rail rolling stock, robotic trailing cables, and outdoor wind-energy sensor cable jackets, where the PA12 sheath provides lower dimensional change under humidity ageing than monomer-residual PVC compounds.
When compressed-air automation lines demand oil-mist-resistant tubing with sustained flex fatigue below -20 °C, die swell instability in flexible pneumatic tubing is exacerbated by moisture in virgin PA12 pellets when residual moisture exceeds 0.10%; plant-scale extrusion operators therefore dry Vestamid L2140B nf at 80 °C for 4–6 h in a desiccant dryer to a dew point of -30 °C before feeding the hopper. This segment covers compressed-air logic lines, valve actuation lines and robotic dress-pack tubes, where tube cut lengths are assembled with push-in fittings and must withstand repeated flexural cycling plus oil mist. The governing standards are ISO 16030 for dimensional tolerances of thermoplastic tubing used in pneumatic fluid power, ISO 14743 for push-in connector tube compatibility, and ISO 527-2 for tensile modulus and elongation after conditioning; additionally, REACH Regulation (EC) No 1907/2006 and RoHS Directive 2011/65/EU restrictions apply to exported harness assemblies. Typical formulation for blue natural-colour pneumatic tube uses Vestamid L2140B nf with 1.0–1.5 wt% polyamide colour masterbatch and 0.2–0.5 wt% heat stabilizer masterbatch; antistatic formulations for dusty assembly environments substitute a conductive carbon black masterbatch at 5.0–8.0 wt%, but this addition lowers notched impact strength by approximately 15%. Extrusion is performed on a 30:1 L/D single-screw extruder fitted with a melt pump and a crosshead die, with zone temperatures from 210 °C to 235 °C, melt pump inlet pressure at 60–80 bar, vacuum sizer pressure at -0.2 bar, and haul-off speed adjusted to maintain ±0.05 mm wall thickness on 4 mm and 6 mm tubes. The principal failure mode observed on high-speed cutting lines is internal diameter collapse when the cooling bath temperature exceeds 45 °C; therefore closed-loop chiller control is used to keep baths between 20 °C and 40 °C. Terminal products are cut-length nylon air line tubes, valve-to-cylinder connection tubes, and heavy-duty robot dress-pack tubes in 4 mm, 6 mm, 8 mm and 10 mm outer diameters.
For engine bay retention parts, zinc chloride road-salt exposure and high-frequency vibration require a polyamide with low water uptake and a ductile response at cold-soak temperatures; Vestamid L2140B nf is therefore injection moulded into clips, connectors and harness routing components. Conformance for this application is based on ISO 291 standard climates for conditioning, ISO 527-2 tensile testing, ISO 179-2/1eU unnotched Charpy impact after -30 °C conditioning, and ISO 868 Shore D hardness. Formulation for black engine bay clips adds 0.5–1.0 wt% carbon black masterbatch and 0.2–0.4 wt% melt-stable antioxidant masterbatch to the neat resin; glass-fibre or mineral reinforcement is not recommended because the plasticized L2140B matrix is used where flexible snap-fit behaviour and low clamp force retention are required, and rigid fillers reduce elongation to a point that undermines installation reliability. The injection moulding process uses a general-purpose reciprocating screw with 20:1 L/D, shot size controlled to 25–60% of barrel capacity, melt temperature between 220 °C and 245 °C, mould temperature between 30 °C and 50 °C, and clamp force of 60–120 t for 8-to-16-cavity cold-runner tools. The principal processing bottleneck is moisture related: pellets exposed to ambient air above 60% RH without drying absorb surface moisture above 0.15%, causing splay and weak knit lines at the hinge points of cable clips; therefore a 4 h, 80 °C dry-air pre-drying step is applied. Terminal finished goods include brake-line stabilizer clips, fuel-line retainers, and harness routing clips used under hood and along chassis rails.
Although recreational equipment is less regulated than automotive fuel systems, low-temperature peel failure in snowshoe decking inserts and ski touring binding components still drives the choice of a flexible, unpainted polyamide 12 with high elongation and low water uptake. Moulders choose Evonik Vestamid L2140B nf in this segment because the material retains tensile elongation above 200% and notch resistance at cold-storage temperatures. Qualification for recreational equipment is less regulated than automotive sectors, but customers still request mechanical conformance: ISO 527-2 for tensile property comparison, ISO 179-1/1eA for notched Charpy at -20 °C, ISO 868 for Shore D hardness, and ISO 105-B02 for colourfastness after UV exposure of coloured components. The compounding window for colour-matched sports components typically uses 1.0–2.0 wt% PA12-based colour masterbatch and 0.2–0.3 wt% UV stabilizer masterbatch; reground sprue and runner material is capped at 20 wt% to avoid shifts in flexural modulus and melt viscosity across production batches. Injection moulding parameters are set with melt temperature from 225 °C to 240 °C, back pressure at 8–12 bar, injection speed from 30 mm/s to 60 mm/s, and mould temperature at 25–40 °C; high-gloss mould surfaces are avoided because the plasticized grade can exhibit die flow lines when mould surface temperature is below 30 °C. Published third-party comparative data for snowshoe insert fatigue in this exact resin grade is limited; however, the mechanical properties under ISO 179-1/1eA are available from resin lot certificates. The manufacturing bottleneck is batch-to-batch colour drift: masterbatch concentration must be controlled to ±0.1 wt% because the natural resin colour shifts from off-white to pale yellow when residence time exceeds 5 min at 240 °C. Finished products include snowshoe decking inserts, ski touring binding toe-piece covers, backpack buckles, and vibration-damping clips for winter sports equipment.
In multi-layer fuel tubing co-extrusion, the outer polyamide 12 layer is subjected to calcium chloride splash, stone impact, and cold-temperature flexing during vehicle assembly; Evonik Vestamid L2140B nf is used as the outer cover or carrier layer because it bonds through maleic anhydride tie layers and retains burst pressure after impact conditioning. The fuel-system homologation envelope includes SAE J2260 for nonmetallic fuel system tubing, ISO 1817 for liquid-resistance evaluation after exposure to gasoline and diesel test fluids, ISO 527-2 for tensile mechanical conformance before and after fuel ageing, and ISO 179-1/1eA for low-temperature impact after -20 °C soak. A typical five-layer structure processes an inner conductive PA12 layer, an inner tie layer, an EVOH barrier layer, an outer tie layer, and an outer Vestamid L2140B nf layer; in the outer layer, 0.3–0.5 wt% heat stabilizer masterbatch and 1.0–2.0 wt% carbon black masterbatch are added, while post-industrial regrind of the same layer is allowed at up to 15 wt% without breaching burst pressure requirements. Co-extrusion is performed on a five-extruder line with main extruder L/D 28:1 and co-extruder L/D 20:1, layer distribution controlled by a spiral or deflection disc feed block, melt temperatures for the outer PA12 layer between 220 °C and 235 °C, die temperature held within ±5 °C of the set point to prevent layer-thickness drift, and vacuum calibration at 35–50 °C. The critical risk on production lines is EVOH interfacial instability when outer-layer melt temperature falls below 215 °C; this causes local thinning and increases fuel permeation above the OEM-specific ceiling referenced from SAE J2260 after 1,000 h ageing. Published third-party permeation data for this specific five-layer configuration is limited; line validation therefore relies on the resin lot MVR, die pressure trace, and post-extrusion dimensional audit against the fuel-system specification. Terminal finished products include low-permeation diesel and gasoline fuel lines, evaporative emission lines, and urea feed lines in multi-layer barrier constructions.
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Evonik VESTAMID L2140B nf (dry properties) Nylon 12 is a natural-coloured, heat-stabilized polyamide 12 resin supplied in pellet form for extrusion and injection-moulding operations. The L2140 designation identifies the PA12 base resin and viscosity class; the B suffix indicates heat stabilization, and nf denotes natural colour without carbon black. The dry-properties qualifier refers to test data generated in the dry-as-molded condition, after desiccant drying to <0.1% residual moisture and before atmospheric moisture uptake. This is the most reproducible condition for comparing lot-to-lot mechanical data; it is not a permanent end-use condition.
The grade is specified for pneumatic and hydraulic tubing, fuel-vapour conduits, cable sheathing, and injection-moulded connectors. Natural colour is useful where visual contamination inspection is required, but it does not provide ultraviolet stabilization. Prolonged outdoor exposure therefore requires carbon-black-containing variants or surface protection. The table below gives representative dry-properties values from manufacturer literature. Lot-specific certificates of analysis should govern qualification.
The term dry properties does not describe a permanent material condition. Polyamide 12 absorbs atmospheric water; at saturation in water at 23 °C, unfilled PA12 typically shows approximately 1.2 wt% moisture uptake under ISO 62. That is much lower than polyamide 6 or polyamide 66 because the longer methylene sequences in PA12 reduce amide-group density. Water uptake plasticizes the amorphous regions: dry tensile modulus is 1500 MPa and dry yield stress is 44 MPa under ISO 527-1/-2, but conditioned tensile modulus for unfilled PA12 commonly falls into the 1000–1200 MPa range, while notched impact strength increases. Published data for the exact equilibrated-condition values of L2140B nf are limited; design calculations for humid service should not assume dry stiffness.
The melting peak is 176 °C under ISO 11357-3, and Shore D hardness is approximately 70 under ISO 868. The glass transition of PA12 is near 45 °C, below that of PA6 or PA66, which contributes to low-temperature ductility but also means that modulus declines as service temperature approaches that region. Because the resin is semicrystalline, dry mechanical values depend on cooling rate and molecular orientation. A tensile bar moulded to ISO 527-2 type 1A may not represent the skin-oriented morphology of a 2 mm extruded tube wall.
| Property | Standard | Unit | Dry value |
|---|---|---|---|
| Density | ISO 1183 | g/cm³ | 1.01 |
| Water absorption at saturation, 23 °C | ISO 62 | wt% | 1.2 |
| Tensile modulus, dry | ISO 527-1/-2 | MPa | 1500 |
| Tensile stress at yield, dry | ISO 527-1/-2 | MPa | 44 |
| Tensile strain at yield, dry | ISO 527-1/-2 | % | 5 |
| Nominal strain at break, dry | ISO 527-1/-2 | % | >50 |
| Charpy notched impact strength, 23 °C, dry | ISO 179-1/1eA | kJ/m² | 5 |
| Melting peak, second heating | ISO 11357-3 | °C | 176 |
| Shore D hardness, dry | ISO 868 | — | 70 |
The dry-property table cannot be used alone for processing scale-up. Melt-phase behaviour of L2140B nf is pseudoplastic, and viscosity at shear rates typical for tube extrusion, 100–1000 s⁻¹, is lower than zero-shear viscosity measured by oscillation. The absence of glass fibres means shear heating is lower than in filled grades; however, the polymer still shows shear-thinning, so screw channels with too low a compression ratio can leave unmelted pellets in the metering zone. A three-zone screw with compression ratio 2.5:1 to 3.0:1 is generally suitable; barrier screws may reduce surging in high-output lines. This practical envelope is derived from standard polyamide 12 processing, but machine-specific validation is required because published data for this specific configuration is limited.
Residual moisture control is the first processing constraint for VESTAMID L2140B nf. If pellet moisture exceeds 0.15% entering the melt zone, hydrolysis-driven chain scission can occur. In tubing extrusion the visible result is surface splay, bubble formation, and melt-pressure drift; the mechanical consequence is reduced burst strength. Pre-drying in desiccant dry-air equipment at 80 °C for 4–6 h is normally sufficient to reach <0.1% residual moisture. Total moisture should be measured by Karl Fischer titration under ISO 15512; loss-on-drying methods can underreport internal moisture. At relative humidity above 60%, opened packaging should not remain uncovered for more than 30–60 min before drying.
On a single-screw extruder with 30:1 L/D, a representative barrel profile from feed to die is 210 °C, 220 °C, 235 °C, 245 °C, with head and die at 250 °C. Melt temperature measured by probe should remain below 260 °C; excursions above 270 °C produce yellowing and viscosity loss. Screw speeds above 80 rpm on a 25 mm diameter screw can generate shear heating beyond the barrel setpoints. For thin-wall tubing, downstream vacuum calibration with cooling water from 20 °C to 40 °C is typical; rapid quenching reduces crystallinity and can lower density slightly. Haul-off puller speed should be controlled with closed-loop diameter feedback because screw speed and puller speed are coupled through melt pressure and wall-thickness control.
Injection moulding of connectors, clips, and housings uses a melt temperature of 230–260 °C and mould temperature of 40–80 °C. Higher mould temperatures allow more time for chain interdiffusion at weld lines and reduce residual stress. Mould shrinkage is approximately 0.5–1.0% under ISO 294-4, with flow-direction values typically lower than transverse values. For wall thicknesses below 1.5 mm, fill times of 0.5–2 s and injection pressures of 60–120 MPa are common starting points. With hot-runner tooling, resin residence time should remain below 10 min; nozzle temperatures should be balanced within ±10 °C because PA12 shear heating makes cavity balance sensitive to small gate-temperature differences.
| Parameter | Range | Notes |
|---|---|---|
| Pre-drying | 80 °C / 4–6 h | desiccant dryer; residual moisture <0.1% |
| Melt temperature | 230–260 °C | avoid >270 °C |
| Barrel profile, feed to die | 210–250 °C | typical 30:1 L/D single-screw |
| Mould temperature | 40–80 °C | injection moulding |
| Mould shrinkage | 0.5–1.0% | ISO 294-4 |
In pneumatic and hydraulic tubing, dry-properties data can overstate elastic stiffness after service moisture uptake. A tube produced from L2140B nf may be installed dry and then absorb moisture from humid air or polar fuel fractions. The resulting plasticization reduces tensile modulus and yield stress while increasing elongation and notched impact resistance. If a design stress is based on dry yield at 44 MPa, the safety margin changes after equilibration. Burst-pressure testing should be performed on conditioned samples according to the relevant product specification, such as SAE J844 for truck air brake tubing or ISO 7628 for polyamide tubing, because burst pressure depends on retained wall thickness and moisture-conditioned toughness.
Low-temperature impact behaviour is another moisture-sensitive boundary. Dry PA12 may show brittle fracture at sharp notches or weld lines below -30 °C; moisture-conditioned PA12 generally shows higher crack-initiation energy and reduced notch sensitivity. Components containing gates, weld lines, or surface scratches should be tested at the lowest service temperature with the service moisture state. Published data for the exact ductile-to-brittle transition of L2140B nf is limited; lot-specific testing under ISO 179-1/1eA at -30 °C and -40 °C is recommended.
VESTAMID L2140B nf is an unfilled PA12. Its dry tensile modulus of 1500 MPa is approximately 3–5 times lower than glass-filled PA12 compounds, which commonly exceed 6000 MPa depending on glass content and fibre aspect ratio. The unfilled grade compensates with nominal strain at break above 50%, lower melt viscosity, and reduced abrasive wear on screw elements, barrels, and hot-runner tips. Unlike plasticized PA12 grades, it contains no external plasticizer that can migrate or be extracted by fuel, so long-term flexibility is governed by polymer chain mobility and moisture content rather than additive loss.
Compared with polyamide 6 and polyamide 66, the product has lower density, 1.01 g/cm³ versus approximately 1.14 g/cm³ for PA6, and lower saturation moisture uptake, approximately 1.2 wt% versus 9–10 wt% for PA6 under ISO 62. That lower uptake gives PA12 more consistent dimensions and electrical properties across humidity. The trade-off is stiffness: dry PA6 and PA66 are commonly in the 2800–3200 MPa tensile modulus range, so L2140B nf is selected where low-temperature ductility, hydrocarbon resistance, and dimensional stability are more important than absolute modulus. In extrusion tooling, the lower melting point of PA12 also allows lower barrel temperatures than PA66, reducing energy input and thermal degradation risk.
Within the VESTAMID L-series, glass-reinforced and impact-modified grades are available. Impact-modified PA12 shows higher notched impact but lower tensile modulus than the unfilled heat-stabilized grade. Glass-filled grades increase modulus and reduce mould shrinkage, but they reduce elongation and increase machine wear. L2140B nf is therefore a middle-position material for components that need toughness without fibre reinforcement. Black carbon-black-containing variants offer improved ultraviolet resistance; mechanical properties are broadly similar, but the natural nf grade lacks that ultraviolet screening function.
Operational boundaries for VESTAMID L2140B nf include a practical upper melt-temperature limit near 270 °C, after which PA12 may show oxidative degradation; melt should not be held at processing temperature for more than 10–15 min per start-up or shutdown cycle. The grade is not recommended for continuous service in air above 100 °C unless long-term aging is validated by ISO 2578 or application-specific thermal-oxidative testing. Chemically, PA12 has good resistance to aliphatic hydrocarbons, oils, and non-polar solvents, but strong acids, concentrated formic acid, phenols, and oxidizing media attack or dissolve the polymer. Zinc chloride solutions, especially hot aqueous systems, can induce environmental stress cracking in stressed PA12 parts.
The nf natural-colour designation does not automatically confer food-contact status. If the end use involves food contact, the specific lot must be evaluated under FDA 21 CFR 177.1500 and EU Regulation 10/2011 with migration testing appropriate to the food type and temperature. REACH and RoHS declarations should be obtained from the supplier for the purchased lot, not inferred from product family literature. For outdoor use, carbon-black-containing variants are preferred; published data for this specific natural-grade configuration is limited.
