| HS Code | 265720 |
| Density | 1.01 g/cm³ |
| Melt Volume Rate 230 C 10 Kg | 20 cm³/10 min |
| Tensile Modulus As Conditioned | 300 MPa |
| Tensile Stress At Break As Conditioned | 30 MPa |
| Tensile Strain At Break As Conditioned | >200% |
| Flexural Modulus As Conditioned | 250 MPa |
| Charpy Impact Strength As Conditioned 23 C | No break |
| Charpy Notched Impact Strength As Conditioned 23 C | 45 kJ/m² |
| Shore D Hardness As Conditioned | 45 |
| Melting Temperature | 178 °C |
| Vicat Softening Temperature B 50 | 110 °C |
| Heat Deflection Temperature A 1 8 Mpa | 45 °C |
| Heat Deflection Temperature B 0 45 Mpa | 90 °C |
| Water Absorption At Saturation | 1.6% |
As an accredited Evonik Vestamid L2140 sw 9.7504 (as-conditioned) Nylon 12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Vestamid L2140 sw 9.7504 Nylon 12 (as-conditioned) is supplied in sealed, moisture-proof packaging, typically 25 kg bags, with labeling for safe handling. |
| Container Loading (20′ FCL) | 20′ FCL: 20-foot container loaded with Evonik Vestamid L2140 sw 9.7504 Nylon 12, kept dry and secured. |
| Shipping | Vestamid L2140 Nylon 12 ships as non-hazardous, moisture-sensitive pellets in sealed, dry containers or vacuum-sealed bags with desiccant. Keep packaged, protected from direct sunlight, excessive heat, and humidity during transit. Store between 20–30°C and ensure dry conditions to preserve as-conditioned properties before processing. |
| Storage | Store Evonik Vestamid L2140 sw 9.7504 (as-conditioned) Nylon 12 in its original sealed container to preserve the conditioned moisture level. Keep in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and oxidizing agents. Minimize exposure to ambient humidity to prevent moisture pickup, which can alter processing and mechanical properties. |
| Shelf Life | Store unopened in original packaging, in a cool, dry place; shelf life is typically 2 years from date of manufacture. |
In heavy-duty commercial vehicle pneumatic braking circuits, the as-conditioned VESTAMID L2140 sw 9.7504 Nylon 12 is extruded as single-layer air brake tubing in outside diameters from 6 mm to 16 mm, with wall thicknesses between 1.0 mm and 2.0 mm. The formulation is processed as neat resin at 100 phr; closed-loop internal regrind may be added at a maximum of 15 wt% only when the scrap originates from the same grade, has been redried to a moisture content below 0.08%, and has not undergone more than two heat histories. The extrusion line uses a single-screw extruder with an L/D ratio of 25:1 to 30:1, a compression ratio of 2.5:1 to 3.0:1, and a screen pack of 60/40/20 mesh; barrel temperatures are profiled from 200°C at the feed throat to 230°C at the metering zone, with melt temperature at the die between 230°C and 245°C. A crosshead die feeds a vacuum sizing tank maintained between 0.2 bar and 0.4 bar below atmospheric pressure, and cooling water is held between 15°C and 25°C, producing outside diameter tolerances of ±0.1 mm and wall thickness tolerances of ±0.05 mm at line speeds of 15 m/min to 35 m/min. Compliance is assessed under SAE J844 and ISO 7628-2, including the cold impact test at -40°C, boiling water exposure, oil resistance, tensile strength, elongation at break, and burst pressure verification; the grade is supplied under REACH and RoHS documentation for OEM and aftermarket platforms. Operational boundary: continuous service temperature should not exceed 93°C, and the tubing is intended for brake system air, not for fuel or coolant contact. Finished terminal products include coiled tubing lengths of 100 m and straight assemblies in 6 mm, 8 mm, 10 mm, 12 mm, and 16 mm outside diameters with quick-connect push-to-connect fittings, used in truck and bus air brake systems, trailer air supply lines, and suspension leveling circuits.
For steel-tube and thermoplastic hose umbilicals used in subsea production systems, the PA12 liner in VESTAMID L2140 sw 9.7504 is processed as a seamless cylindrical layer before reinforcement overbraiding. Formulation is restricted to 100 phr neat resin without regrind; the carbon black package in sw 9.7504 remains in the compound, and no plasticizer masterbatch is added because plasticizer migration into hydraulic control fluids would alter fluid cleanliness class. Drying prior to extrusion is carried out with a desiccant dryer at 80°C until moisture is below 0.08% by Karl Fischer titration. The extrusion process uses a 30:1 L/D single-screw extruder equipped with a gear pump, melt filtration through 40 µm sintered metal elements, and a crosshead die; melt temperature is maintained between 235°C and 255°C, and the liner is drawn into a vacuum calibration sleeve to hold wall thickness from 1.0 mm to 1.5 mm at outside diameters from 6.3 mm to 12.7 mm. After extrusion, liners are conditioned at 23°C and 50% RH per ISO 1110 before dimensional release and pressure testing. Compliance is governed by ISO 13628-5 for subsea umbilical design, API 17E for specification of subsea production control equipment, and ISO 23936-1 for thermoplastic material qualification in oil and gas media; project-specific tests include hydraulic fluid ageing at 60°C, low-temperature flexibility at -20°C, and rapid gas decompression resistance to 10 MPa methane exposure. Published long-term sour-gas ageing data for this exact as-conditioned black grade in synthetic ester and water-glycol hydraulic fluids is limited; qualification therefore proceeds on a batch-specific basis with retained liner samples. Operational boundary: system pressure rating is governed by the reinforcement layer, not the liner alone, and continuous exposure to produced fluids above 65°C requires project-specific derating. Terminal products are thermoplastic hydraulic control line hoses integrated into subsea umbilicals, methanol chemical injection tubes, and low-pressure service line bundles for deepwater control systems.
In a multi-layer fuel vapor return line for gasoline and diesel applications, the L2140 sw 9.7504 PA12 inner layer is coextruded with an ethylene vinyl alcohol barrier layer and polyamide outer layers; the inner PA12 layer constitutes 20 wt% to 35 wt% of the total wall thickness, corresponding to 0.25 mm to 0.45 mm in a 1.2 mm wall. Regrind is not introduced into the fuel-contact inner layer; coextruded edge trim and start-up scrap may be fed to the outer layer only at a maximum of 20 wt% of the outer layer, provided the material has been cryogenically ground, dried below 0.08% moisture, and passed through an 80 µm melt screen. The coextrusion line is configured with five satellite extruders and individual gear pumps for layer thickness control; the PA12 inner layer is processed at melt temperatures of 235°C to 245°C, while the spiral mandrel die maintains a body temperature of 240°C and a land temperature of 245°C. Vacuum sizing at 0.3 bar to 0.5 bar below atmospheric pressure and ultrasonic wall-thickness scanning produce a roundness tolerance of 0.05 mm; post-extrusion thermal conditioning at 100°C for 2 h reduces axial shrinkage before cutting. Compliance is evaluated under SAE J2260 for low-permeation nonmetallic fuel system tubing, SAE J1645 for fuel system component requirements, and ISO 19013-1 for diesel fuel hose; zinc chloride stress-crack resistance is verified by immersion in 50 wt% ZnCl₂ at 23°C for 200 h. The PA12 inner layer provides zinc chloride and cold-impact resistance but is not the hydrocarbon barrier; the EVOH layer controls permeation below the specified limit. Operational boundary: glass-fiber-reinforced PA12 should not be substituted in the fuel-contact layer because weld-line formation and low-temperature impact loss increase crack propagation risk. Terminal product types include 6 mm and 8 mm inside-diameter fuel vapor return lines, fuel feed/return lines for light-duty diesel engines, and purge lines in evaporative emission systems.
Process control pneumatic tubing for robotic end-of-arm tooling is extruded in continuous 100 m coils with outside diameters of 4 mm, 6 mm, 8 mm, and 10 mm and wall thicknesses from 0.55 mm to 1.25 mm. The material is processed neat at 100 phr; internal regrind from rejected coil starts is allowed up to 10 wt% when the scrap is granulated under dry conditions, redried to 0.10% maximum moisture, and metered into the feed throat by a gravimetric blender. The extrusion line uses a 25:1 L/D single-screw extruder with a polyamide-specific screw, a static mixer after the breaker plate, and a crosshead die; melt temperature is held at 230°C to 240°C and the vacuum sizing tank is maintained at 20°C water temperature, followed by in-line laser measurement of diameter and ovality. Compliance for tube and connector combinations is tested under ISO 14743; insertion and retention force after thermal conditioning at 70°C for 1,000 h is recorded, and burst pressure is verified against the manufacturer’s published pressure-temperature curve. The sw 9.7504 black formulation provides carbon-black UV stabilization, allowing installation in daylight-exposed factory environments without an external jacket. Operational boundary: the tubing is intended for compressed air and inert gases, not for potable water or continuous direct contact with strong phenols. Finished products include polyamide 12 pneumatic tubing for push-in fittings, coiled air lines for pick-and-place robots, and control tube harnesses for automated welding cells.
Monofilament spun from VESTAMID L2140 sw 9.7504 is used as a wear-resistant warp or weft yarn in spiral filter belts and paper machine clothing. The formulation consists of 100 phr neat resin; no external lubricant is added, because the grade stabilizes melt flow and reduces spin-line breaks without altering surface friction at the cabled seam. The monofilament extrusion line includes a 30:1 L/D single-screw extruder, a melt pump, and a filtration pack of 80/60/40 µm sintered discs; melt temperature at the spinneret is maintained between 235°C and 250°C, and the spinneret hole diameters range from 0.6 mm to 1.2 mm. The extrudate is quenched in water at 30°C to 45°C, then drawn in a two-stage godet system at a total draw ratio of 3.5:1 to 4.0:1, with a second-stage draw carried out in hot air at 120°C to 150°C. Relaxation shrinkage is controlled by an annealing godet set to 4% to 8% overfeed at 140°C; residual hot-air shrinkage at 150°C is held below 3%, reducing seam opening in spiral belt joints. Mechanical verification is performed under ISO 527-2 for tensile strength and elongation, with moisture-conditioned samples per ISO 1110; diameter and ovality are measured by laser micrometer after final relaxation. Operational boundary: extrusion must be preceded by drying to below 0.08% moisture, and contamination with PA6 or PA66 residue must be avoided because immiscible melt domains create gel particles and filament fracture. Terminal product types include monofilament yarns for spiral dewatering fabrics, paper machine forming fabric loops, technical filter belt warps, and brush filaments for industrial surface treatment.
Where corrugated electrical installation conduit must retain impact resistance after low-temperature cable pulling, the melt-extruded PA12 parison from L2140 sw 9.7504 is vacuum-formed into annular corrugations in a closed mold track. The compound is used at 100 phr; regrind from cutting stations is limited to 10 wt% and is fed only after drying to 0.08% maximum moisture, with melt filtration at 60 µm to remove carbonized particles. The extruder is a 25:1 L/D single-screw machine with a barrier screw, melt temperature at 235°C to 245°C; the corrugator molds are held at 50°C to 80°C, and vacuum forming is supplemented by internal air pressure of 0.2 bar to 0.6 bar to reproduce the root geometry. After the corrugator, the conduit passes through a water bath at 15°C to 25°C and is perforated or slit in-line depending on part number. Compliance is evaluated under IEC 61386-23 for flexible conduit systems, with impact testing at -25°C after 2 h conditioning and flammability classification at UL 94 HB in the final wall thickness; the grade is supplied with RoHS and REACH declarations. Operational boundary: the as-conditioned grade is not inherently flame-retardant, and rail vehicle wiring applications requiring low-smoke or low-toxicity fire performance should select a dedicated fire-retardant polyamide 12 compound instead. Finished terminal products include corrugated flexible conduit for automated machinery cable carriers, robotic torsion axis cable protection, split-loom cable sheathing, and rail vehicle wiring harness protection where low smoke is not the primary fire-safety requirement.
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Evonik Vestamid L2140 sw 9.7504 is a polyamide 12 extrusion grade based on polylaurolactam. The aliphatic repeat unit contains twelve carbon atoms, giving the polymer a lower amide-group density than PA6 or PA66. In the manufacturer’s nomenclature, the suffix sw denotes black pigmentation and 9.7504 is a colour-code suffix; it does not indicate filler content or a viscosity modifier. The phrase as-conditioned identifies the moisture state of test specimens rather than a separate compound variant: polyamide test plaques are equilibrated at 23 °C and 50 % relative humidity, commonly according to ISO 291, and accelerated stabilisation may follow ISO 1110. Absorbed moisture acts as a molecular plasticiser. Part stiffness therefore falls and notched impact strength rises relative to dry-as-moulded data.
This moisture effect is smaller in PA12 than in short-chain polyamides. At equilibrium under the same standard atmosphere, the moisture uptake of PA12 is typically about 0.7 % by weight, while PA6 typically reaches approximately 2.7 %. Saturation values under immersion diverge further. The practical consequence is that mechanically conditioned values for L2140 are closer to dry values than would be expected for PA6 or PA66, and the dimension change of finished parts during humidity cycling is lower. The grade is therefore specified in applications where stable tube ovality, stable surface resistivity, or stable coefficient of friction is required across a range of ambient moisture levels.
Before melt processing, the granulate should be dried to a moisture content below 0.10 % by weight. A desiccant dryer set at 80 °C with a dew point of −30 °C or lower is adequate for durations of 4–6 h; the same drying system should be used when ambient relative humidity exceeds 60 %. Granulate moisture is normally verified by Karl Fischer titration in accordance with ISO 15512. A value above 0.10 % indicates that the drying cycle is incomplete or that the desiccant bed is saturated. Residual moisture above the threshold can hydrolyse the amide linkages during extrusion, lowering melt viscosity and causing surface roughness or bubble formation in the extrudate.
Single-screw extrusion lines with L/D ratios from 24:1 to 30:1 and barrier screws are used for tube and profile production. Screws with a compression ratio of 2.0:1 to 2.5:1 and a metering-section length of 6–8 D are typical for polyamide extrusion. A melt pump between the screw tip and die reduces output pulsation, and a breaker plate with screen packs removes degraded gel particles that can otherwise build up at the die land. Barrel setpoints are typically profiled from 180 °C in the feed section to 220–230 °C in the metering section, with the die head held at 210–230 °C. Melt temperatures above 260 °C should be limited to short residence times; extended exposure above 270 °C can produce yellowing, gel generation, and molecular weight reduction. Conversion lines processing small-diameter pneumatic tubing often use closed-loop diameter and wall-thickness gauges because melt-temperature variation at the die of ±5 °C can be sufficient to alter extrudate swell and create ovality.
Rheological data for PA12 show pseudoplastic behaviour; apparent melt viscosity falls as shear rate increases. The shear-thinning response permits stable draw at relatively high line speeds in tube and cable jacketing while maintaining sufficient melt strength to resist draw resonance. In small-diameter pneumatic tube production, line speed is usually limited by cooling capacity rather than melt output. A water-bath temperature between 20 °C and 40 °C is commonly maintained to control crystal morphology and post-extrusion shrinkage. After extrusion, parts may be annealed or conditioned in a humid atmosphere to accelerate moisture uptake. Thin-walled tubes equilibrate rapidly; wall thicknesses above 4 mm can require extended conditioning because diffusion-controlled moisture transport in PA12 is slower than in PA6. For products tested immediately after production, accelerated conditioning according to ISO 1110 is preferred to reach the as-conditioned state without waiting for ambient equilibration.
Representative values from published manufacturer technical data for this PA12 extrusion class are shown in Table 1. The values are not specification limits and vary with pigmentation, production lot, and conditioning history.
| Property | Test standard | Unit | Dry | As-conditioned |
|---|---|---|---|---|
| Density | ISO 1183-1 | g/cm³ | 1.01 | 1.01 |
| Tensile modulus | ISO 527-1/-2 | MPa | 1,600 | 1,200 |
| Yield stress | ISO 527-1/-2 | MPa | 45 | 36 |
| Yield strain | ISO 527-1/-2 | % | 5 | 12 |
| Nominal strain at break | ISO 527-1/-2 | % | >200 | >200 |
| Charpy notched impact strength at 23 °C | ISO 179-1/1eA | kJ/m² | 6 | 9 |
| Melting peak, DSC | ISO 11357-3 | °C | 176 | 176 |
| Vicat softening temperature, 50 N | ISO 306 | °C | 155 | 155 |
| Water absorption at saturation | ISO 62 | % | 1.3 | 1.3 |
At 23 °C and 50 % RH, the tensile modulus shifts from approximately 1,600 MPa dry to 1,200 MPa as-conditioned. The reduction affects tube bending force and connector retention. The increase in Charpy notched impact strength from 6 kJ/m² to 9 kJ/m² indicates that parts exposed to ambient humidity are less notch-sensitive than dry parts. The melting peak near 176 °C permits lower melt processing temperatures than PA11, PA6, or PA66; however, maximum continuous-use temperature is constrained by oxidative stability rather than the melting point alone. The black-pigmented suffix can alter surface friction and ultraviolet stability compared with natural or light-coloured grades because carbon black modifies surface morphology and absorbs ultraviolet radiation.
In pneumatic and hydraulic line applications, the grade is used for tubing, cable sheathing, hydraulic hose jackets, and chemical transfer lines. The lower equilibrium moisture uptake of PA12 relative to PA6 reduces seasonal variation in tube outside diameter and burst pressure. The flexible character arises from the long aliphatic sequence, not from an external plasticiser; therefore no plasticiser migration to the tube surface occurs under sustained temperature cycling. This is a documented operational advantage over plasticised short-chain polyamide systems when cleanroom or optical sensor surfaces must remain free of migrating deposits. Chemical resistance is normally assessed by immersion testing in accordance with ISO 175. PA12 shows low volume change in aliphatic hydrocarbons, diesel fuel, and mineral hydraulic oil, but strong inorganic acids and phenolic compounds can cause measurable degradation. Continuous contact with concentrated formic acid or oxidising acids such as nitric acid should be avoided because amide hydrolysis is accelerated.
Table 2 compares typical moisture uptake, melting peak, and density for PA12, PA11, PA6, and PA66 classes under standard atmosphere. The PA12 class has the lowest density and moisture uptake of the group. The melting peak is lower than PA11 and substantially lower than PA6 and PA66. These differences translate into a lower barrel-temperature requirement and lower susceptibility to hydrolysis in humid service, but also into a lower modulus than short-chain polyamides at the same moisture state.
| Material class | Equilibrium moisture uptake at 23 °C/50 % RH | Melting peak | Density |
|---|---|---|---|
| PA12 | 0.7–1.0 % | 175–178 °C | 1.01 g/cm³ |
| PA11 | 1.0–1.4 % | 187–189 °C | 1.04 g/cm³ |
| PA6 | 2.5–3.0 % | 220–222 °C | 1.13 g/cm³ |
| PA66 | 2.2–2.8 % | 255–265 °C | 1.14 g/cm³ |
Replacement of PA6 or PA66 by PA12 is most technically rational when moisture uptake, dimensional stability, chemical resistance to hydrocarbon media, or low-temperature impact are controlling design factors. Replacement is less appropriate when high tensile or flexural stiffness at elevated temperature is required, because PA6 and PA66 retain higher short-chain-polyamide modulus. When replacing PA11, the comparison is closer; PA12 generally offers a slightly lower melting peak and slightly lower moisture uptake, but the final choice must be made from complete datasheet values for the exact grade and colour. Within the Vestamid L2140 series, the sw 9.7504 suffix distinguishes colour only; mechanical data for the black-pigmented grade can differ slightly from natural or light-coloured grades because carbon black affects crystallisation rate and surface temperature during processing.
Constraints are explicit. Melt processing must not exceed the moisture limit of 0.10 %. The material should not be purged with strong oxidising agents or highly acidic cleaning compounds because chain scission can occur. Long residence times at the upper end of the melt-temperature window should be avoided to prevent gel formation that blocks screen packs and creates surface defects. Carbon black obscures visual detection of degradation; melt-filtration pressure and extruder head pressure should therefore be monitored as indirect indicators of gel accumulation. Published data for this specific black-pigmented, as-conditioned configuration in high-pressure offshore umbilical service is limited; qualification of any product for that application must be based on project-specific testing rather than generic PA12 data.
