| HS Code | 778995 |
| Density | 1.01 g/cm³ |
| Melting Point | 178 °C |
| Vicat Softening Temperature B50 | 120 °C |
| Tensile Strength Yield | 40 MPa |
| Tensile Elongation At Break | 200 % |
| Flexural Modulus | 1000 MPa |
| Charpy Impact Strength 23 C | No break |
| Charpy Impact Strength 30 C | No break |
| Charpy Notched Impact Strength 30 C | 12 kJ/m² |
| Shore Hardness D | 60 |
| Water Absorption 24 H | 0.8 % |
| Melt Volume Rate 230 C 2 16 Kg | 10 cm³/10 min |
As an accredited Evonik VESTAMID® X7373 black 9.7504 Nylon 12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Evonik VESTAMID® X7373 black 9.7504 Nylon 12 is supplied as pellets in sealed 25 kg bags. |
| Container Loading (20′ FCL) | 20′ FCL: palletized bags of VESTAMID X7373 Nylon 12, securely stowed, protected from moisture and damage during transit. |
| Shipping | VESTAMID® X7373 Nylon 12 ships as a non-hazardous granular solid. It is supplied in sealed, moisture-proof bags to prevent water absorption, which can affect processing. Store in a cool, dry area away from direct sunlight. Standard ground freight is acceptable; avoid excessive heat or puncturing during handling. |
| Storage | Store VESTAMID® X7373 black 9.7504 Nylon 12 in its original, unopened packaging in a cool, dry place away from direct sunlight and heat sources. Keep containers tightly sealed to prevent moisture absorption, which can affect processing. Avoid exposure to rain, humidity, and contaminants. Use within the manufacturer’s recommended shelf life. |
| Shelf Life | Store in original sealed packaging, dry and cool. Shelf life is typically two years from delivery date. |
The application matrix for Evonik VESTAMID X7373 black 9.7504 Nylon 12 is restricted to industrial sectors that document processability of semi-flexible, high-impact polyamide 12 extrusion or injection compounds in non-food, non-implantable applications. Six downstream processing zones are defined below. Medical, pharmaceutical, and food-contact articles are excluded from this technical sheet because no USP Class VI or EU 10/2011 compliance statement is published for this grade. Each section identifies the governing application compliance designation, the formulation addition ratio at the converting line, the downstream production equipment and process window, and the terminal article category.
Where compressed-air braking circuits require thermoplastic tubing to sustain 8.5 bar nominal service pressure and thermal cycling between -40 °C and +90 °C without longitudinal split or fitting blow-off, the semi-flexible PA12 wall is extruded directly from VESTAMID X7373 black 9.7504 as a 100 wt% compound feed. No downstream addition of plasticizer, impact modifier, or filler is used on the converting line because the granulate already contains the balance of semi-flexibility and low-temperature impact resistance required for ISO 7628-1 dimensional classes and ISO 7628-2 performance classes. For this specific brake-tube configuration, the common end-of-line formulation rule is 100 parts by weight virgin compound; regrind from start-up purge, dimensional rejects, and calibration swarf is dried to <0.10 wt% moisture and then let down at a maximum of 15 wt% only when finished-tube lot testing confirms retained burst pressure after 168 h at 100 °C according to ISO 1402. Production-scale extrusion runs use a single-screw extruder with 30:1 L/D, a barrier screw having compression ratio 2.8:1, barrel zones set at 220 °C/230 °C/240 °C/250 °C, and a crosshead die at 250 °C with 800 µm breaker plate screening. Pre-drying is mandatory before extrusion: 4–6 h at 80 °C in a desiccant dryer to bring moisture below 0.10%. The extrudate enters a vacuum calibration sleeve with pressure of -0.4 bar, then passes through a 20–25 °C water bath at line speeds of 40–80 m/min depending on outer diameter. Finished articles are polyamide air-brake tubes for tractor units, semitrailers, and bus chassis, typically in outside diameters of 6–16 mm and wall thicknesses of 1.0–1.5 mm.
In subsea control umbilical outer sheathing, the governing specification is API Spec 17E / ISO 13628-5, with material release testing performed on the sheathing compound by ISO 1133-1 MVR at 250 °C and 2.16 kg and tensile properties by ISO 527-2 before crosshead extrusion. The sheathing layer is compounded as 100% virgin VESTAMID X7373 black 9.7504 for load-bearing jacket sections; regrind from terminated cable ends and outer-jacket peel is limited to 10 wt% of total feed and is used solely in non-pressure-retaining protective layers because particle contamination from steel tube handling can initiate holidays in the sheath. The extrusion line comprises a 90 mm single-screw extruder with 24:1 L/D feeding a pressure-controlled crosshead that applies a 2.5–5.0 mm sheath over the galvanized steel tube bundle. Granulate is pre-dried at 80 °C for 4–6 h to <0.10% moisture; the barrel set points from feed to metering are 210 °C/220 °C/230 °C, and the die head is held at 235 °C. The post-die cooling sequence is the critical control: a quench at 20 °C produces a higher frozen-in amorphous skin and increases long-term hydrolysis sensitivity in service, whereas a warm-water trough at 40 °C reduces residual stress and microvoid formation in the jacket. Finished articles include outer sheaths for subsea production control umbilicals, electro-hydraulic flying leads, and maintenance jumpers. Published data comparing hydrolysis retention after 1000 h in synthetic seawater at 80 °C for this exact plasticized grade are limited; qualification therefore requires finished umbilical jacket peel tests under ISO 13628-5 rather than reliance on resin-level ageing data alone.
Railway rolling-stock cable jacketing on thermoplastic PA12 is evaluated against EN 45545-2 fire-hazard categories for floor, ceiling, and wall cable installations, with smoke density measured according to ISO 5659-2 at an irradiance of 25 kW/m² and limiting oxygen index determined by ISO 4589-2. The jacketing line uses a 100% virgin compound ratio of VESTAMID X7373 black 9.7504; no regrind or in-house reclaim is used in fire-hazard rated jackets because residual carbon black dispersion defects in reprocessed PA12 can alter smoke-density scatter and produce surface roughness that affects the specified abrasion performance. Extrusion is performed on a 45 mm single-screw machine with 25:1 L/D, a low-compression screw for thin-wall melt stability, and barrel temperatures of 215 °C to 235 °C; the crosshead is set at 240 °C, and copper conductors are preheated to 80 °C before entering the pressure die. The extruded jacket wall thickness is controlled between 0.4 mm and 1.2 mm, with eccentricity held below 0.05 mm by a laser micrometer positioned after the first cooling section. Cooling water is maintained at 50–60 °C to prevent microcracking during high-speed extrusion and to reduce residual stress before coiling. Terminal products are halogen-free railway vehicle control and power cable jackets for rolling stock signal lines, bogie sensor cables, and interior wiring routed underfloor.
In automated assembly lines where pneumatic control lines are routed through cable carriers at bend radii as low as 3 times outer diameter, the tubing compound is specified for resistance to zinc-alkyldithiophosphate compressor oil carryover and ozone ageing at +70 °C. Industrial pneumatic installations are governed by ISO 4414 for system safety; material flexural modulus is checked by ISO 178, tensile retention is measured by ISO 527-2 after circulating-air ageing at 100 °C for 1000 h, and chemical resistance is evaluated by ISO 175 after immersion in mineral-oil-based compressor oil at 120 °C for 72 h. The compound is converted at 100 parts by weight VESTAMID X7373 black 9.7504 per 100 parts total feed; downstream addition of plasticizer is specifically not performed because it shifts the tubing Shore hardness and can produce pressure-dependent ovality. Production uses a grooved-feed single-screw extruder with 30:1 L/D and a distributive mixing section, melt temperature 235–245 °C, die temperature 230 °C, and internal vacuum sizing at -0.3 bar to keep ovality below 0.03 mm. The air gap between die and sizing sleeve is maintained at 5–10 mm; a conditioning tunnel at 70 °C for 2 h after extrusion restores equilibrium moisture to 0.2–0.4% and stabilizes dimensions before cutting. If cut-end regrind is reused in non-safety interlock circuits only, it is sieve-controlled below 500 µm and limited to 20 wt% of total feed. Terminal articles are 4–12 mm outside diameter pneumatic control lines for valve actuation, linear slide sensors, and robot end-of-arm tooling.
For cleated athletic footwear applications where cold-impact durability at -30 °C and low water uptake are required in the same part, injection-molded interlocking sole plates use plasticized nylon 12. The applicable chemical-compliance framework for such footwear components is REACH Annex XVII entries 51 and 52 for restricted phthalates and polycyclic aromatic hydrocarbons, with CPSIA Section 108 requirements applying only when the sole plate is incorporated into children’s footwear. Mechanical release testing follows ISO 527-2 for tensile properties and ISO 179-1 for Charpy notched impact at -30 °C. The shot weight is 100% VESTAMID X7373 black 9.7504; cold-runner regrind is allowed at no more than 10 wt% of total shot, because higher regrind loads lower notched impact at low temperature and shift the dimension after moisture conditioning. Molding is carried out on a hydraulic injection machine with clamp force of 160–220 t and a 22:1 L/D general-purpose screw. Barrel set points are 240 °C/250 °C/260 °C/260 °C, the hot runner is held at 255 °C, and mold temperature is controlled to 50–70 °C. Injection speed is 60–100 mm/s, holding pressure is 500–800 bar for 5–8 s, and cooling time is 12–18 s for a 2.0–3.0 mm nominal wall. Post-molding conditioning at 23 °C and 50% RH for 48 h stabilizes the finished plate dimensions before stud insertion. Terminal products are interlocking sole plates for soccer, rugby, and field-sport shoes requiring removable cleat systems.
Because robotic welding arcs expose cable protection conduits to spatter, chopped flux, and metalworking-fluid aerosols, corrugated semi-flexible conduits are converted from VESTAMID X7373 black 9.7504 at a 100% compound feed; the black 9.7504 colour specification eliminates the need for a downstream carbon black masterbatch let-down, and corrugator scrap regrind is capped at 12 wt% of total feed to keep corrugation root wall thickness above minimum design value. Flammability is evaluated at the finished-conduit level by UL 94 HB, while chemical resistance to water-based and mineral-oil-based metalworking fluids is tested by ISO 175 after immersion at 120 °C for 72 h. The production line consists of a 30:1 L/D single-screw extruder, melt pump, and moving corrugator block system. Pre-drying at 80 °C for 4 h to <0.10% moisture is required because residual moisture reduces melt viscosity and destabilizes the corrugation wave geometry. The die head is maintained at 245 °C, melt pressure at the die adapter is 90–110 bar, corrugator vacuum is -0.6 bar, and blow air pressure inside the profile is 0.2–0.4 bar; forming blocks are thermostatted at 20–30 °C. Terminal articles are semi-flexible PA12 corrugated conduits used as cable protection on robotic welding arms, machine-tool harness carriers, and automated guided vehicle charging cable guides.
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VESTAMID X7373 black 9.7504 is a black-pigmented polyamide 12 compound supplied by Evonik Operations GmbH for melt extrusion and injection molding of flexible technical parts. The material belongs to the polyamide 12 family because the repeating unit contains an eleven-carbon aliphatic chain between amide groups; this structure yields lower density and lower equilibrium moisture uptake than PA 6 or PA 66. The base polymer is typically classified within the polyamide 12 group under ISO 16396-1, but the exact designation and melt-flow condition must be taken from the current Evonik datasheet because the suffix 9.7504 is a color/formulation code rather than a viscosity descriptor. The compound is manufactured with carbon black pigmentation, which provides ultraviolet stabilization and may reduce electrical surface resistivity. Because mechanical and rheological values are formulation-specific, the following treatment uses PA 12 class ranges and identifies where product-specific confirmation is required.
Polyamide 12 is hygroscopic, and hydrolytic degradation at melt temperature is accelerated by residual moisture. In extrusion, moisture levels above 0.10 % by mass are associated with splay, melt-pressure variation, die-lip deposit, and reduced tensile strength in the finished wall. On production-scale equipment, the failure mode is often misinterpreted as a die-fill problem; in practice, intermittent bubble formation and diameter oscillation in a vacuum-calibrated tube line are consistent signs of moisture. The pre-drying recommendation for PA 12 compounds is a desiccant-bed dryer with an air inlet temperature of 80–90 °C and a dew point of −30 °C or lower for 4–8 h. Material stored in opened packaging at relative humidity above 60 % should be re-dried or sub-hopper blanketed with dry air. The feed throat should be water-cooled to prevent premature melting and bridging in the first screw flight.
Hydrolytic chain scission is autocatalytic when acid end groups are generated; therefore a small initial moisture excursion can produce a measurable change in relative viscosity. Melt flow rate increases as chain scission proceeds, and the resulting lower melt strength makes thin-wall tube calibration more difficult. For this reason, drying should be validated by Karl Fischer titration or an equivalent moisture-specific method rather than weight loss alone. A dew-point meter on the dryer exhaust is useful for maintenance but does not confirm resin moisture content.
| Parameter | Observed range | Comment |
|---|---|---|
| Desiccant dryer air temperature | 80–90 °C | Lower for long residence, higher only if hopper residence is short |
| Required final moisture | <0.10 % | Karl Fischer or equivalent |
| Feed zone barrel | 180–200 °C | Water cooling of the feed throat |
| Compression zone | 200–220 °C | Adjust based on screw wear |
| Metering zone | 210–230 °C | Monitor melt temperature at adapter |
| Die | 200–220 °C | Lower die temperature can increase melt fracture |
| Maximum sustained melt temperature | 250 °C | Limit oxidation and black speck formation |
Process qualification on single-screw lines should include continuous melt-temperature recording at the adapter and periodic melt-flow verification. The extruder size is selected so that the required output does not impose residence times longer than 15 min at processing temperature. Start-up from a frozen barrel should be done at low screw speed to avoid excessive torque; head pressure should be observed for abrupt changes that indicate unmelted material or carbon-black agglomerates. Screen packs with 60/80/100 mesh may be used where fine filtration is required, but every screen pack adds melt temperature and pressure drop. Breaker-plate pressure should not exceed the die and clamp ratings specified for the specific machine, and barrel-temperature compensation should be made after screen changes.
The flow behavior of VESTAMID X7373 black 9.7504 is non-Newtonian: apparent viscosity decreases with increasing shear rate, but carbon black can raise low-shear viscosity and create yield-like behavior when dispersion is poor. Single-screw extruders with L/D ratios between 25:1 and 30:1 and compression ratios between 2.5:1 and 3.0:1 are generally used for PA 12 tube and profile extrusion. Barrier screws and Maddock mixing sections can improve carbon-black distribution but may increase melt temperature by 3–8 °C at constant throughput. Screw-recovery time should be measured after each screw-speed change; a drift of more than 10 % at fixed speed and temperature is a diagnostic for feed-throat blockage, resin moisture variation, or screw wear.
Chrome-plated screws and bimetallic barrels are preferred for long campaigns because carbon black can cause abrasive wear in the metering section. For co-rotating twin-screw compounding, distributive mixing should be prioritized over high shear because carbon-black agglomerates can act as localized stress concentrators in thin-wall tubing. Melt quality is best monitored by a combination of pressure variation at the die, visual inspection for black specks, and measurement of elongation at break on extruded specimens. A pressure variation greater than ±2 % at constant screw speed is often an early indicator of feeding instability or partial screw wear.
PA 12, PA 11, PA 6, and PA 66 differ in moisture sensitivity, density, and sub-ambient impact. PA 6 and PA 66 exhibit saturation moisture uptake commonly in the range 2.5–3.0 % by mass, whereas PA 12 generally reaches 1.4–1.6 % under the same conditions. This reduced uptake limits humidity-induced dimensional change and hydrolysis in humid service. PA 11 and PA 12 have comparable moisture behavior and low-temperature ductility, but PA 12 often provides lower density and a lower crystalline melting point, which can simplify extrusion and reduce mass. VESTAMID X7373 black 9.7504, as a flexible grade, has lower flexural modulus and higher elongation than unplasticized PA 12 extrusion grades; the trade-off is a reduction in heat-deflection temperature and tensile stiffness. Comparative testing should use specimens conditioned under ISO 291 standard atmosphere 23/50, because polyamide mechanical properties are strongly dependent on moisture and strain rate.
Flexible black PA 12 compounds are used in automotive tube and hose applications such as air-brake lines, pneumatic control lines, fuel-vapor lines, and cable sheathing. In air-brake tubing, the specified test regime may include DIN 73378 or SAE J844, covering dimensions, burst pressure at elevated temperature, cold-impact, and aging resistance. VESTAMID X7373 black 9.7504 can be considered where the design requires low-temperature impact and ultraviolet stability from carbon black. Chemical compatibility must be reviewed against the service fluid; PA 12 is generally resistant to aliphatic hydrocarbons, automotive fuels, greases, and salt solutions, but it is attacked by concentrated sulfuric acid, formic acid, phenols, and strong oxidizing agents. Zinc chloride solutions from de-icing salts can cause environmental stress cracking in stressed PA 12 components; validation under ISO 22088 or a comparable stress-cracking procedure is necessary when such exposure is possible.
Processing limitations include the risk of degradation above 250 °C and warpage caused by rapid cooling of thin-wall extrudates. Calibration and cooling baths should maintain gradual temperature reduction to reduce ovality and residual stress. For flexible PA 12 tubing, dimensional tolerances often require wall-thickness variation below ±0.05 mm; this requires melt-temperature variation at the die below ±3 °C and stable vacuum calibration. Published data for this specific configuration is limited; production trials should therefore establish the correlation between die temperature, haul-off speed, and final diameter before routine manufacturing begins.
| Property | Method | Unit | Condition note |
|---|---|---|---|
| Density | ISO 1183-1:2019 | g/cm³ | 25 °C |
| Melt volume-flow rate | ISO 1133-1:2022 | cm³/10 min | Load and temperature per datasheet |
| Tensile stress/strain | ISO 527-1/-2 | MPa, % | Type 1A or 5A specimen |
| Flexural modulus | ISO 178 | MPa | 3-point, 2 mm/min |
| Charpy notched impact | ISO 179-1/1eA | kJ/m² | 23 °C and −30 °C |
| Melting temperature | ISO 11357-3 | °C | Second heating |
| Water absorption | ISO 62 | % | 23 °C saturation |
Injection molding of VESTAMID X7373 black 9.7504, if used for fittings or connectors, requires separate validation of melt temperature, injection speed, and hold pressure because flow length and gate freeze time differ from semi-crystalline PA 66. Mold cooling should maintain a surface temperature in the range 40–80 °C for adequate crystallization. Any regulatory statement concerning food-contact, drinking-water, or medical use must be confirmed against the supplier’s written certifications, because pigment and additive packages can alter compliance status. Avoid combination with strong oxidizing agents and prolonged contact with chlorinated solvents at elevated temperature; no compatibility statement should be transferred from natural PA 12 to the black grade without specific migration and extraction testing on the final component.
