| HS Code | 328331 |
| Density | 1.01 g/cm³ |
| Melt Volume Rate | 20 cm³/10 min (275°C, 5 kg) |
| Melting Temperature | 178 °C |
| Vicat Softening Temperature | 110 °C |
| Heat Deflection Temperature 0 45 Mpa | 130 °C |
| Tensile Modulus | 1.2 GPa |
| Tensile Stress At Yield | 40 MPa |
| Nominal Strain At Break | >50% |
| Charpy Notched Impact Strength 23 C | 60 kJ/m² |
| Charpy Notched Impact Strength 30 C | 15 kJ/m² |
| Water Absorption 24h Immersion | 0.2% |
| Moisture Absorption 50 Rh | 0.8% |
As an accredited Evonik VESTAMID® LX9008 BK 9.7504 Nylon 12, Dry factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg sealed moisture-proof drums: Evonik VESTAMID LX9008 BK 9.7504 Nylon 12, dry granules, ready for processing. |
| Container Loading (20′ FCL) | Load 20′ FCL container with palletized Evonik VESTAMID LX9008 nylon 12; secure cargo, keep dry, and avoid contamination. |
| Shipping | Evonik VESTAMID® LX9008 BK 9.7504 Nylon 12 ships as dry, non-hazardous pellets in sealed moisture-barrier bags, boxes, or drums. Protect from humidity and direct sunlight; store in a cool, dry area. Standard ground transport is suitable; avoid excessive stacking to prevent bag deformation. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and ignition sources. Keep tightly sealed in its original container to prevent moisture absorption, which can degrade the Nylon 12. Avoid exposure to humidity and extreme temperatures. Use within the manufacturer’s recommended shelf life, typically two years from date of manufacture. |
| Shelf Life | Shelf life is typically 2 years when stored dry, cool, and in unopened original packaging. |
In monolayer commercial-vehicle air brake tubing, VESTAMID® LX9008 BK 9.7504 Nylon 12, Dry is dried at 80 °C in a desiccant-air hopper dryer with a dew point below -40 °C until residual moisture is below 0.1 % by ISO 15512. The dried pellets are conveyed to a single-screw extruder with 30:1 L/D and a grooved feed section; barrel zones are set from 210 °C at the feed throat to 240 °C at the die head, with melt temperature held below 250 °C to limit thermo-oxidative degradation. Vacuum venting at -0.08 MPa is maintained to strip residual water and low-molecular-weight volatiles. The extrudate enters a vacuum calibration tank held at 25 °C to 50 °C and is pulled through an ultrasonic wall-thickness gauge; for 12 mm outside-diameter brake-tube formats, the outer diameter is controlled within ±0.05 mm. Production-line failure modes in this track are dominated by ovality and melt fracture when puller speed and internal sizing air pressure are adjusted independently. When the melt is too hot at the die land, a low-viscosity surface layer produces longitudinal ridging, which is not acceptable under ISO 7628-1:2010 dimensional requirements or SAE J844 surface-quality clauses.
The critical process conflict in this application is the interaction between residual moisture and retention of burst strength. Moisture above 0.15 % before extrusion hydrolyzes the nylon 12 backbone, lowering molar mass and producing pinholes during the post-extrusion conditioning oven step. The resulting failure mode shifts from ductile burst at 23 °C to brittle shatter at -40 °C after heat aging. Batch-to-batch integrity is therefore tracked by incoming viscosity number in accordance with ISO 307 in sulfuric acid solution, not solely by certificate moisture. Lots with viscosity number below the supplier’s lower control limit are quarantined for low-temperature impact retesting before line clearance. The same drying and molar-mass discipline applies to coiled tube stock later formed into spiral-wrapped trailer air lines, because bending stresses at the coil outside diameter expose molecular-weight defects that straight-tube burst tests do not.
In automotive evaporative emission return lines, the dimensional problem is not melt strength alone but die-gap stability when the black nylon 12 layer is coextruded at 1.0 mm to 1.5 mm wall thickness over a thin tie layer. The main extruder is commonly a 45 mm single-screw machine with 25:1 L/D; the die head is supplied by a gear pump to hold pressure fluctuation below 0.5 %. When the outer layer uses VESTAMID LX9008 BK 9.7504, the barrel profile is shifted 5 °C to 10 °C lower than a standard unfilled PA12 because carbon black pigment increases near-wall shear heating. Failure to compensate for that shear-heat rise creates local melt-temperature differences across the annular die, causing wall thickness drift of 0.05 mm to 0.10 mm over a 2,000 m coil. Such drift is detected by downstream ultrasonic scanning and triggers rejection because subsequent hot-bend forming of the line amplifies a thin band into a kink.
Permeation validation for fuel vapor return lines is usually conducted under SAE J2260 at 60 °C, but published data for this specific black grade in a complete coextruded structure is limited. Off-line testing therefore compares the PA12 layer’s resistance to aggressive test fuel and to aqueous zinc chloride stress cracking. Zinc chloride stress-crack testing is common for nylon 12 automotive tubes because galvanized storage fixtures and winter road-salt spray can generate the salt; OEM material specifications define a crack-length threshold. Processing parameters that reduce orientation—lower draw-down ratio, higher calibration water temperature, and reduced internal air pressure—improve stress-crack resistance but degrade ovality control. This trade-off is resolved on a line-by-line basis through design-of-experiment runs rather than a fixed generic recipe.
Cable jacket extrusion differs from tube extrusion because the nylon 12 melt is applied over a moving copper or fiber-optic core at line speeds that can vary from 10 m/min to 35 m/min depending on core diameter. On a 90 mm smooth-bore extruder with 25:1 L/D and a crosshead die, VESTAMID LX9008 BK 9.7504 is run at a melt temperature near 225 °C to 235 °C to avoid overheating the underlying insulation. The carbon black package must be fully dispersed; agglomerates larger than 20 μm can act as crack initiators in cold-bend testing. Jacket thickness is typically 1.2 mm to 3.0 mm, and the limiting performance criterion is low-temperature flexibility after thermal aging. Manufacturers evaluate retention of elongation at break using ASTM D638 specimens cut longitudinally from the jacket and cold bend per IEC 60811-1-4 at -40 °C. When the line is run too fast, the outer surface quenches before the inner wall solidifies, creating radial residual stress that later appears as longitudinal outer-jacket splits during dynamic bending on sheave towers.
In subsea or offshore control cables, the black PA12 jacket must also withstand long-term exposure to hydraulic oil mist, alkaline drilling fluids, and high-humidity storage. Oil absorption is measured by immersion in IRM 903 oil at 100 °C for 72 h in accordance with ISO 1817; acceptance limits are cable-maker specific because the carbon black surface area of the 9.7504 colour code influences oil uptake. Jacket modulus after oil conditioning is measured under ISO 527-1:2019; a drop below the cable design’s lower limit changes bend radius and armour bedding behaviour. Where a cable is intended for dynamic laying, the PA12 jacket is not qualified as a primary structural member; fatigue validation is performed on the complete cable construction under end-user dynamic bend protocols rather than on the material alone.
Push-to-connect industrial compressed-air systems impose a different set of constraints because the tube outside diameter acts as the sealing surface inside an elastomeric O-ring. For VESTAMID LX9008 BK 9.7504, the key measurable is outer-diameter roundness and surface hardness after cooling; residual concavity from vacuum calibration increases insertion force and can nick the fitting O-ring. Roundness error is controlled within 0.03 mm and surface die lines are specified no deeper than 5 μm, because deeper lines create a leak path past the O-ring defined in ISO 14743. Calibration water temperature is held at 25 °C to 40 °C to balance surface smoothness against plugging of the calibration die with nylon oligomers. If the water bath is too cold, the outer skin freezes with high surface tension but low crystallinity, which reduces long-term creep resistance under continuous shop-air pressures of 0.8 MPa to 1.0 MPa.
Tube inventory destined for push-to-connect systems is usually stored dry and capped; open-coil storage under high-humidity conditions changes outside diameter through moisture uptake before installation. Just-in-time length stabilization and pre-cutting conditioning are therefore used to keep fitting insertion force stable. The same calibration discipline carries into multi-tube bundles clipped into cable carriers, where abrasion between adjacent black PA12 tubes and steel chain is evaluated by fixture-based wear testing rather than by material tensile data alone.
Corrugated harness conduit is produced by extruding a tube and feeding it immediately into a mold-block corrugator that vacuum-forms convolutions. The determining variable is melt viscosity at the forming point; a melt temperature 5 °C to 8 °C too low causes incomplete root formation, while a melt 5 °C too high thins the web between convolutions to 0.20 mm or less and causes split failures during subsequent harness pull-through. On a 50 mm single-screw line, the die-to-corrugator distance is held as short as practical because nylon 12 crystallizes quickly. Start-up scrap is generated until the extruder reaches steady-state melt pressure; raising the corrugator vacuum from -0.02 MPa to -0.06 MPa shifts the root radius but does not correct wall-thinning caused by low melt strength.
This track is more tolerant of moisture than pressure-rated tubing, but it is not immune to hydrolytic surface roughness. Residual moisture above 0.2 % produces surface streaks on the black conduit exterior and reduces the consistency of the corrugation geometry. Drying is retained at 80 °C even when the conduit is classified as non-pressure protective conduit under IEC 61386. The black pigmentation permits visual inspection for gross defects, but final gap dimensions between convolutions are verified by optical comparator because small differences alter cable-bending radius and clip retention force.
For hydraulic hose jackets, the nylon 12 layer is applied by pressure extrusion over a synthetic-rubber inner tube, with adhesion created by a tie layer rather than by surface roughness of the PA12 alone. In two-layer or three-layer constructions, VESTAMID LX9008 BK 9.7504 is processed through a crosshead die at 230 °C to 245 °C, with a vacuum calibration section only if the jacket is specified with an exact outside diameter for steel-braid compression fittings. Impulse performance is evaluated on the finished hose assembly under SAE J517 at 133 % of rated working pressure; material-level tensile properties are less predictive than the jacket’s resistance to cut, abrasion, and hydraulic-oil swell. Jacket splits at the braid witness line are observed when die pressure is too high and the nylon 12 is forced into the braid gaps, thinning the outer layer over the wire. Correcting that requires reducing line speed or increasing die gap, not raising melt temperature, which would lower viscosity and worsen penetration into the reinforcement.
Because hydraulic hoses are used on construction machinery, the jacket must withstand mineral-oil spray, pressure washing, and rock impact. Abrasion resistance is measured on the complete hose assembly using an OEM rotating-drum fixture, and lot qualification often includes hardness after immersion in hydraulic oil at 100 °C for 72 h. The black 9.7504 grade is typically not chosen for colour-coded laylines; layline ink adhesion is evaluated separately because the carbon-black surface can reduce surface energy. The extrusion equipment for this track is usually a 60 mm single-screw extruder with a grooved barrel and 25:1 L/D paired with a pressure head and no vacuum sizer.
Thin-wall control-cable liners represent the shallow end of the application complexity range. The tube is extruded at 0.5 mm to 0.8 mm wall thickness on a 30 mm single-screw extruder, quenched in warm water to minimize crystallinity gradient, and wound on spools; no pressure rating or permeation barrier qualification is required. The only process rule beyond standard 80 °C drying is that re-dried spool stock must not be dried more than 4 h at elevated temperature or it becomes brittle at the flaring step.
Published data for this specific black grade in control-cable liner applications is limited; the track is a direct transfer from industrial tubing practice and does not require separate compliance testing beyond OEM fit and function checks. The low coefficient of friction and carbon-black colour package are sufficient for stainless-steel wire actuation in marine and agricultural machinery, but no pressure-integrity standard is invoked.
| Downstream track | Referenced standard | Typical assessment endpoint |
|---|---|---|
| Commercial-vehicle air brake tube | ISO 7628-1:2010, SAE J844 | Dimension, burst, cold impact, surface quality |
| Fuel vapor return line | SAE J2260 | Permeation at 60 °C, zinc chloride stress-crack resistance |
| Pneumatic push-to-connect tube | ISO 14743 | OD roundness, insertion/retention force, leak rate |
| Offshore control-cable jacket | IEC 60811-1-4 | Cold bend at -40 °C, elongation after aging |
| Hydraulic hose jacket | SAE J517 | Impulse cycles at 133 % rated working pressure, oil aging |
| Corrugated harness conduit | IEC 61386 | Corrugation geometry, crush resistance, abrasion |
| Control-cable liner | OEM fit/function | Insertion force, bend radius, flaring integrity |
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Evonik VESTAMID® LX9008 BK 9.7504 Nylon 12, Dry is a black-pigmented, plasticized polyamide 12 extrusion resin supplied as moisture-controlled granules for monolayer and coextruded tubing. The grade designation “BK” identifies the black color package; “9.7504” is the internal color and grade code; “Dry” denotes packaging at a moisture content below 0.10% by weight prior to shipment. In pneumatic braking, hydraulic control, and vacuum tube constructions, the resin is selected where low-temperature impact, low moisture uptake, dimensional stability, and resistance to zinc chloride stress cracking govern material choice. The PA12 repeat unit has a longer aliphatic chain than PA6 or PA66, which reduces amide density and restricts equilibrium water absorption. Published data for this specific color lot is limited; acceptance testing should therefore rely on the lot-specific certificate of analysis and the supplier’s current technical data sheet.
Plasticization lowers tensile modulus and Shore hardness while increasing elongation at break. For this grade, supplier-typical values place tensile modulus below 0.35 GPa when measured by ISO 527-1/-2 at 23 °C, with elongation at break above 300%. The DSC melting peak lies in the 170–180 °C band according to ISO 11357-3. Low-temperature flexibility remains sufficient for cold-climate pneumatic lines; burst-pressure and flex testing at -40 °C is normally required. Because plasticizer migration can alter fitting retention and surface friction, qualification must include insertion-force and pull-out resistance after oven aging at 100 °C for 168 h using the relevant OEM test method. The modulus reduction relative to unmodified PA12 improves coil-set memory and kink resistance but must not be assumed to meet all high-pressure tube requirements without burst-pressure verification.
Rheological testing on capillary rheometers at 230 °C shows that plasticized PA12 tube grades are shear-thinning; apparent viscosity decreases with shear rate, allowing thin-walled tube extrusion at high line speeds. However, the same shear-thinning increases die swell and can complicate calibration. To avoid circumferential variation, die land length should be at least 10–15 times the die gap, and drawdown ratio should not exceed 1.2:1 for thick-wall tube or 3:1 for thin-wall pneumatic tube. If drawdown is too high, orientation within the tube wall becomes anisotropic, reducing hoop stress in burst-pressure testing. The exact melt-flow value for the 9.7504 lot should be obtained from the certificate of analysis and checked by ISO 1133-1 at 235 °C with 5 kg load, because melt-flow rate shifts with plasticizer content.
Extrusion of the dry resin is performed on single-screw extruders with 24:1 to 30:1 L/D and a three-zone general-purpose screw having a compression ratio of 2.5:1 to 3.0:1. A screen pack of 60/80/100 mesh is installed upstream of the die. Barrel settings are profiled from 180 °C at the feed throat to 210–230 °C at the metering zone and head; melt temperature is maintained below 240 °C. At melt temperatures above 230 °C, residence time below 10 min is required to limit thermal degradation and black color shift. Vacuum venting at -0.08 MPa gauge pressure or lower is recommended when regrind is present. Sizing and cooling are carried out in a 20–30 °C water trough under vacuum or pressure calibration. Precision lines should run online laser diameter gauges and a melt pressure transducer before the breaker plate; pressure above 300 bar often indicates melt fracture, gel accumulation, or contaminated screen pack.
Tooling for the grade requires matched compression ratio and die geometry. The die bushing and mandrel are typically maintained with 0.5–1.0 mm land length for 8–12 mm outer-diameter tube, and the sizing sleeve is offset by 0.2 mm from the die centre to account for die swell. Vacuum calibration at -0.02 to -0.06 MPa controls outer diameter. Water-bath lengths of 10–15 m are used at line speeds of 30–80 m/min for thin-wall pneumatic tube; thick-wall tube runs slower to allow crystallinity development. If cooling is too rapid, the inner wall can retain amorphous phase, causing post-crystallization and dimensional shrinkage in service. Annealing at 120 °C for 30 min may be required to stabilize dimensions.
Even though PA12 absorbs less water than PA6 or PA66, moisture above 0.10% hydrolyzes the melt and produces surface splay. The dry-as-supplied state reduces but does not eliminate drying. If opened packages are held for more than 4 h at relative humidity above 60%, a dehumidifying hopper dryer set to 80 °C for 4–6 h with a dew point below -30 °C is standard. Drying at 80 °C for more than 24 h may discolor the material. Regrind may be added up to 20% if it is free of oil, dust, and moisture and is processed through a dedusting air classifier. Higher regrind fractions reduce burst-pressure consistency and increase melt-fracture risk in thin-walled tubing because the first heat history broadens the molecular weight distribution. Batch-to-batch variance in the 9.7504 black concentrate can affect moisture pickup; therefore, hopper residence time must be validated by moisture analysis according to ISO 15512 rather than by visual inspection alone.
Processing conflict exists between drying temperature and color stability. Drying at 80 °C is needed to remove moisture, but prolonged exposure can darken black pellets and increase gel formation. If a desiccant dryer with dew point below -30 °C is used, moisture can be removed at 60 °C over 8 h to reduce thermal load. However, 60 °C drying may not bring moisture below 0.10% when initial moisture exceeds 0.3%. A two-stage drying protocol is therefore recommended: 4 h at 80 °C followed by 2 h at 60 °C under low-dew-point air. This reduces thermal stress while meeting the moisture specification.
For pneumatic braking systems, tube assemblies made from this grade are typically evaluated under SAE J844 or ISO 7628-1. The selection rationale is the ability to pass low-temperature flex testing and zinc chloride stress-crack testing after extrusion and after heat aging. Burst pressure is verified at -40 °C, 23 °C, and 100 °C. Dimensional stability is checked after 24 h water immersion. The table below outlines the compliance anchors for an automotive air-brake tube qualification program.
| Standard / Method | Scope | Typical Test Condition |
|---|---|---|
| SAE J844 | Air brake tubing for road vehicles | Burst, low-temperature flexibility, zinc chloride resistance, moisture absorption |
| ISO 7628-1 | Thermoplastics tubing for air braking systems; dimensions and marking | Dimensional tolerances and marking legibility |
| ASTM D638-14 | Tensile properties of plastics | 50 mm/min, Type IV or Type V specimen at 23 °C |
| ISO 527-1/-2 | Tensile modulus and elongation | 50 mm/min at 23 °C |
| ISO 1183-1 | Density by immersion | 23 °C |
| ISO 62 | Water absorption | Saturation at 23 °C |
| ISO 11357-3 | Melting and crystallization temperature by DSC | 10 K/min |
| ISO 15512 | Water content by Karl Fischer titration | Hopper or pellet sample, 0.10% control limit |
Qualification for fuel vapor and vacuum lines may require additional permeation testing. PA12 offers higher resistance to aliphatic and aromatic fuel vapor permeation than PA6 or flexible PVC, but it is not a barrier polymer like ETFE or PVDF. Consequently, the LX9008 grade is limited to low-pressure vapor, vacuum, or air circuits unless wall thickness is increased or a multilayer barrier structure is coextruded. Permeation coefficients must be generated on the actual finished wall structure; published data for this specific configuration is limited. In coextrusion, the processing window narrows because the tie-layer and barrier-layer melt temperatures must overlap; layer-to-layer melt temperature mismatch should remain below 15 °C to maintain adhesion and avoid interfacial instability.
In mobile and industrial environments with condensing moisture, PA12 is preferred because its long aliphatic chain limits equilibrium water absorption to approximately 1–2% at saturation under ISO 62, whereas PA6 can exceed 9%. The grade is resistant to zinc chloride salt solutions and windshield-washer solvents; both environments can cause rapid environmental stress cracking in PA6 and PA66. Flexible PVC may provide lower raw-material cost and good low-temperature flexibility, but plasticizer migration from PVC in closed air circuits can create fogging and fitting contamination; PA12 reduces this risk. The material is not recommended for continuous exposure to strong acids, strong oxidizing agents, or ethanol-based fuels above 60 °C. Compatibility with brake fluids and phosphate-ester hydraulic fluids must be tested under ISO 1817, because plasticizer interaction can alter hardness and dimensional swell.
Production-scale use of VESTAMID LX9008 BK 9.7504 has been reported in heavy-truck air-brake tube lines and off-highway pneumatic control tubing where SAE J844 burst and low-temperature requirements govern. On twin-screw compounding lines, the resin is not compounded; any color masterbatch or process aid must be PA12-compatible and introduced below 2 wt% unless supplier approval is documented. In injection-molded fittings, the grade is occasionally used for overmolding or clip components if the mold design accounts for reduced modulus and elevated elongation. However, the product is not a general-purpose molding resin; its viscosity is optimized for tube extrusion, and the dry-as-supplied pellet condition can cause feeding instability in small injection screw diameters below 25 mm. In such cases, an unplasticized PA12 such as VESTAMID L1600 or L1700 is generally selected. This distinction matters because the LX9008 designation identifies a plasticized flexible-tube grade rather than a high-strength structural PA12.
Comparison with unmodified VESTAMID L1600 or L1700 PA12 shows that LX9008 shifts the failure mode from yielding to large deformation before break. The plasticizer reduces Shore D hardness into the 55–65 range and lowers tensile modulus by approximately 60–70% relative to unplasticized PA12. This improves strain recovery in coiled tube packaging and reduces kinking during engine-compartment installation. The same modification reduces the upper service temperature under load and can increase creep. For continuous operation above 100 °C or high hoop stress, an unplasticized PA12 or a long-chain polyamide with higher heat distortion resistance is preferred. The black color package provides some UV stabilization for exterior exposure, but prolonged weathering can still produce surface chalking; UV performance should be verified by ISO 4892-2 accelerated weathering rather than inferred from carbon black content alone.
Zinc chloride stress-crack resistance is a critical selection advantage. The test involves wrapping the tube around a mandrel and applying 50 wt% zinc chloride solution at 23 °C for 200 h or at 50 °C for 24 h, depending on the OEM method. PA12 tubes must show no external cracks or burst-pressure loss. The plasticizer in LX9008 improves flexibility but can reduce stress-crack resistance if the tube is over-plasticized; the grade is therefore formulated to balance low-temperature flexibility and environmental stress-cracking resistance.
When compared with PA11, PA12 has a slightly lower equilibrium moisture uptake due to lower amide concentration and often a slightly lower processing temperature. PA11 may offer better renewable content because it derives from castor oil; PA12 may offer more consistent dimensions in humid environments and broader field history in automotive air-brake tubing. The choice between VESTAMID LX9008 and a flexible PA11 grade should consider the full lifecycle requirements, including low-temperature impact, moisture absorption, and barrier performance. For heavy-truck air-brake applications, PA12 is frequently retained because of zinc chloride resistance and established compliance data under SAE J844.
Under REACH and RoHS restrictions, the base PA12 resin is generally considered compliant for heavy-metal restrictions; the 9.7504 black pigment package should be confirmed against IEC 62321 for lead, cadmium, mercury, and hexavalent chromium if the end-use enters electrical or electronic equipment. For food-contact applications, the suitability of this specific color lot must be confirmed against the supplier’s declaration under EU 10/2011; no blanket approval should be assumed because carbon black and process aids vary with color code. Production lots should be sampled for moisture by ISO 15512, melt flow rate by ISO 1133-1, and density by ISO 1183-1. Out-of-spec moisture in the pellet hopper above 0.15% can cause hydrolysis-induced molecular weight loss, which is detected by a drop in melt viscosity and a corresponding loss in burst pressure. Incoming inspection should also monitor pellet size distribution; fines below 0.5 mm can cause feed bridging and surging in single-screw extruders.
