| HS Code | 899035 |
| Density | 1.01 g/cm³ |
| Melting Point | 178 °C |
| Water Absorption 24 H 23 C | 0.2 % |
| Tensile Modulus | 850 MPa |
| Tensile Stress At Break | 40 MPa |
| Tensile Strain At Break | 300 % |
| Charpy Notched Impact Strength 23 C | No break |
| Charpy Notched Impact Strength 30 C | 30 kJ/m² |
| Shore D Hardness | 65 |
| Heat Deflection Temperature 0 45 Mpa | 130 °C |
| Melt Volume Flow Rate | 12 cm³/10 min |
| Vicat Softening Temperature | 165 °C |
As an accredited Evonik VESTAMID® X7297 black 9.7507 Nylon 12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Evonik VESTAMID® X7297 black Nylon 12 supplied as pellets, packaged in sealed 25 kg moisture-resistant bags for safe transport. |
| Container Loading (20′ FCL) | 20' FCL loaded with Evonik VESTAMID® X7297 black Nylon 12, securely palletized in bags, ready for safe transport. |
| Shipping | VESTAMID® X7297 black Nylon 12 ships as non-hazardous polymer granules. Keep packaging sealed to prevent moisture absorption. Store in a cool, dry area away from direct sunlight and incompatible materials. Standard ground freight is suitable; no special hazmat labeling required. Protect from physical damage during transit. |
| Storage | Store Evonik VESTAMID® X7297 black 9.7507 Nylon 12 in its original, tightly sealed container in a cool, dry, well-ventilated area. Protect from direct sunlight, heat sources, and moisture, as humidity absorption can affect processing. Keep away from incompatible materials. Use within the manufacturer’s recommended shelf life to maintain quality. |
| Shelf Life | Shelf life is typically 2 years when stored unopened in original packaging in a cool, dry place. |
Multilayer fuel feed, return, and evaporative canister lines for gasoline and ethanol-blended fuel systems are produced with VESTAMID X7297 black 9.7507 as the continuous polyamide 12 matrix in both the inner fluid-contact layer and the outer impact layer. In a five-layer wall construction, the resin is metered to form a 0.20 mm inner layer and a 0.50 mm outer layer within a nominal 1.00 mm total wall, yielding an aggregate VESTAMID X7297 black 9.7507 fraction of approximately 70 wt% of the finished wall mass. The remaining 30 wt% is divided between an ethylene-vinyl alcohol copolymer barrier layer and anhydride-grafted tie layers. Tube outside diameters range from 6.0 mm to 14.0 mm, with wall thickness tolerance held at ±0.05 mm. The outer PA12 layer is maintained at no less than 2.5 times the inner PA12 thickness when low-temperature impact and abrasion resistance control the part specification.
Downstream production is performed on a five-extruder coextrusion line equipped with single-screw machines having 25:1 to 30:1 L/D barrels and gear pumps set to hold layer throughput variation within ±2%. The PA12 layers are processed at melt temperatures from 235°C to 245°C, while the EVOH extruder is capped at 230°C to avoid gel formation at the barrier interface. The coextrusion die is held between 235°C and 240°C, and vacuum calibration is maintained at −0.2 bar to −0.6 bar with 20 MHz ultrasonic wall measurement controlling eccentricity below 0.05 mm. Pellet pre-drying at 80°C for 4 h to 6 h to a maximum moisture content of 0.10% is mandatory when storage relative humidity exceeds 60%; failure to meet this specification produces outer-layer splay and reduces apparent melt strength, which disturbs the inner-to-outer layer ratio during line speed changes.
Compliance is documented against SAE J2260 for fuel permeation, SAE J1645 for system-level fuel system performance, ISO 527-2:2012 for tensile validation, and ISO 868 for Shore D hardness of the PA12 layers. Terminal components include OEM gasoline and diesel fuel feed lines, return lines, carbon canister vapor tubes for passenger cars, light commercial vehicles, and powersport fuel systems. At alcohol fuel exposure above E10, the finished tube assembly is validated for extraction and swell under the vehicle producer’s internal fluid-resistance protocol; published public data for this specific grade in E85 service is limited.
SAE J844 nonmetallic air brake tubing extruded from VESTAMID X7297 black 9.7507 is processed as a monolayer wall at 100% virgin resin. Clean in-line skeletal regrind is limited to 20 wt% maximum because higher regrind fractions lower low-temperature elongation and increase coil set in the already plasticizer-adjusted product. The material is metered without additional carbon black masterbatch because the 9.7507 black pigmentation is incorporated in the delivered pellet. Monolayer tube is produced in nominal outside diameters of 6.35 mm, 9.53 mm, and 12.70 mm, with wall thickness from 0.76 mm to 1.50 mm depending on pneumatic circuit pressure class.
Extrusion uses a single-screw machine with grooved feed section, barrier screw, 24:1 L/D, and a 60/80/60 mesh screen pack. Barrel temperatures are profiled from 220°C to 245°C, with adapter at 245°C and die at 240°C. Melt temperature is controlled within ±5°C because the plasticized PA12 exhibits a steep viscosity slope and die swell instability outside this band. A vacuum sizer operating near 0.6 bar vacuum and an OD laser gauge with 0.01 mm resolution are required. After extrusion, coils are conditioned for 24 h at 23°C ±2°C before final diameter verification. Coiling on mandrels below 300 mm diameter after quenching at 10°C to 20°C increases cold set beyond the SAE J844 bend test limit. Production-scale line data for this grade indicate that line speeds above 40 m/min increase ovality on 6.35 mm OD tube beyond 0.10 mm unless vacuum is raised and haul-off puller speed is trimmed.
Procurement specifications are aligned with SAE J844, SAE J1131 for truck and bus pneumatic performance, ISO 527-2:2012 for tensile properties, and ISO 188 for accelerated aging. Terminal products are coiled nylon air brake lines for tractor-trailer service and emergency circuits, spring brake actuator tubing, suspension leveling lines, and wheel-end pneumatic control lines.
In thermoplastic hydraulic hose constructions covered by SAE J517, VESTAMID X7297 black 9.7507 is specified as the inner liner for 100R7 and 100R8 medium-pressure assemblies. The liner is metered at 100% resin and extruded to wall thicknesses between 0.25 mm and 0.80 mm for inside diameters from 4.8 mm to 25.4 mm, depending on the reinforcement package and impulse pressure class. For 100R8 constructions rated at 2000 psi, liner wall is typically held at the upper end of that range to reduce stress cracking under cyclic surge. The addition ratio is not modified with secondary polyamides or impact modifiers in serial production; any viscosity adjustment is made through grade selection, not compounding at the hose manufacturer.
Tube production uses a precision single-screw extruder with 30:1 L/D, a straight-through head, and nitrogen purge at 0.2 bar to minimize internal surface oxidation. Melt temperature is limited to 235°C to 250°C; above 250°C, the plasticized PA12 emits low-level volatiles that deposit on the calibrator mandrel and create inner-surface chatter. After liner sizing and cooling, polyester or aramid braid is applied over the liner with ≥90% braid coverage, and a polyurethane cover is crosshead-extruded at 180°C to 210°C. Finished hose is tested to SAE J343 impulse requirements and ISO 7751:2021 proof-to-burst ratio. For zinc-free synthetic ester fluids at continuous 100°C, published data specific to VESTAMID X7297 black 9.7507 is limited, and lot qualification under the actual fluid is required before serial release.
Terminal components include forklift mast hoses, agricultural implement hydraulic lines, construction equipment pilot lines, and mobile hydraulic power unit return lines.
Corrugated and smooth cable protection conduits are extruded from VESTAMID X7297 black 9.7507 at 100% resin addition; no additional carbon black or lubricant masterbatch is required because the black colorant package in the 9.7507 delivery form is homogenized before pelletizing. Wall thickness is maintained from 0.4 mm to 1.2 mm, with inner diameters from 10 mm to 50 mm for rail and mining installations. Production uses a single-screw extruder at 24:1 to 30:1 L/D, die temperature 225°C, and a corrugator with vacuum blocks maintained at 40°C to 60°C. Vacuum instability below −0.4 bar produces radial wall thinning at the corrugation crests and is controlled with closed-loop vacuum valves. Compliance is verified under IEC 61386-1 for conduit mechanical performance and EN 45545-2 for rail material fire behavior where applicable. Unfilled PA12 alone should not be represented as an HL3 self-extinguishing system; where EN 45545-2 R22/R23 compliance is required, the finished conduit must be tested as an assembly with flame-retardant wrapping or coating. Terminal products are railway on-board wire conduits, mining trailing cable conduits, and robotic dress-pack energy chains.
Push-to-connect pneumatic control tube stock is extruded from VESTAMID X7297 black 9.7507 as monolayer tube in outside diameters from 4 mm to 16 mm, with wall thicknesses selected for 10 bar working pressure at a 3:1 burst-to-working-pressure ratio. The resin is metered at 100%; no blending with PA11 or PA6 is required to meet the target flexibility because the grade is supplied heat-stabilized and plasticized. Extrusion is performed on a single-screw line with 25:1 L/D, vacuum sizing, and on-line spark testing for pinholes at 3 kV after cooling. Melt temperature is controlled from 225°C to 240°C, and pre-drying to 0.10% moisture at 80°C is mandatory. Acceptance testing is performed to ISO 527-2:2012 for mechanical properties, ISO 7751:2021 for pressure ratios, and ASTM D638-14 for cross-check tensile values on punched specimens. Terminal products are compressed air lines for factory automation, valve manifolds, robotic end-of-arm tooling, and pneumatic controls in wet processing areas.
Competitive Evonik VESTAMID® X7297 black 9.7507 Nylon 12 prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615365186327 or mail to admin@ascent-chem.com.
We will respond to you as soon as possible.
Tel: +8615365186327
Email: admin@ascent-chem.com
Flexible payment, competitive price, premium service - Inquire now!
Evonik VESTAMID® X7297 black 9.7507 is a plasticized, heat-stabilized polyamide 12 compound supplied as a black formulation identified by the manufacturer colour code 9.7507. The X-series designation places the material among extrudable PA12 grades formulated for reduced flexural stiffness and greater strain capability compared with unplasticized L-series grades. Because the polymer backbone is derived from laurolactam, the repeat unit contains a longer aliphatic segment than PA6 or PA66. This structural difference reduces amide group density and provides the basis for lower equilibrium moisture uptake, lower density, and reduced property drift under humidity cycling.
The grade is normally characterised using a harmonised datasheet structure: density by ISO 1183, tensile modulus and elongation by ISO 527-1/-2 or ASTM D638-14, flexural properties by ISO 178, Charpy or Izod impact by ISO 179-1 or ISO 180, melting temperature by ISO 11357-3, and water absorption by ISO 62. Test specimens are conditioned at 23°C and 50% relative humidity in accordance with ISO 291 unless otherwise specified. Because the black 9.7507 colour number contains carbon black, the rheological and thermal ageing response may differ from natural or uncoloured versions of the same base compound. Lot-specific certificates should be reviewed because pigment dispersion and nucleation affect final crystalline morphology.
Published data for this exact black 9.7507 designation is limited outside the manufacturer’s controlled datasheet environment. Where a value is not directly verified, it is identified here as a general PA12 or X-series characteristic rather than a lot-specific value. This distinction is relevant in qualification work for automotive and industrial fluid handling systems, where a change in pigmentation or plasticizer package can shift cold impact toughness and extraction behaviour under the same test method.
Within the VESTAMID PA12 range, unplasticized extrusion grades are specified for rigid tube and profile applications where hoop strength and creep resistance dominate. The X-series, including X7297 black 9.7507, is modified through plasticization to reduce secant flexural modulus and increase strain at break. The plasticizer is distributed primarily in the amorphous phase, lowering the glass-transition response and improving flexibility at low service temperatures. Because the effect depends on plasticizer–amide group interaction, the modification is not equivalent to an elastomer-toughened system. A plasticized grade may show greater plasticizer migration in contact with certain fuels, oils, or solvents, whereas an impact-modified PA12 retains phase-separated rubber domains but may have a higher low-temperature modulus than a heavily plasticized product.
In comparison with PA6 and PA66, the PA12 base of X7297 has a lower melt-processing temperature and lower moisture equilibrium uptake. Typical unplasticized PA12 density is near 1.01 g/cm³, while PA6 and PA66 are near 1.14 g/cm³. PA12 also exhibits lower saturated moisture uptake, typically about 1.5% by weight under full immersion, compared with 9.5% for PA6 and 8.5% for PA66. These values are not specific to the black 9.7507 compound but define the platform behaviour from which the plasticized grade departs.
Against PA11, which is also a long-chain polyamide, PA12 offers comparable low moisture uptake but differs in melting point and feedstock route. Selection between VESTAMID X7297 and a PA11 or PA6/12 compound normally depends on the required combination of low-temperature flexibility, fuel resistance, and stabiliser package. Direct numerical comparison against another grade must be based on the current manufacturer datasheet.
Before melt processing, the compound must be dried in a desiccant-air dryer rather than a simple hot-air oven. The target residual moisture level is at or below 0.10% by weight when measured by ISO 15512. Drying air with a dew point at or below -40°C and a drying temperature of 80°C is common. Drying time depends on hopper loading, bulk density, and storage history, but 4 h to 6 h is typically applied for sealed feed material. Insufficient drying lowers melt viscosity through hydrolysis and produces surface roughness, bubble formation, and reduced burst strength in extruded tube.
Single-screw extrusion of tubing and profiles from this grade is carried out on machines with L/D ratios of 24:1 to 30:1 and screw compression ratios from 2.5:1 to 3.5:1. A barrier screw or a three-zone screw with a mixing section is accepted when backpressure is controlled. Melt temperatures are maintained between 200°C and 250°C. The die temperature is usually held near the melt temperature, while the feed throat is cooled to prevent granule bridging. Screen packs at 60/80/100 mesh remove unmelted gels and carbon black agglomerates from the melt stream.
Vented barrels are not recommended for this product unless a separate devolatilisation zone is configured with vacuum at -0.8 bar or lower because plasticizer loss can occur at the vent. If a vented extruder must be used, the vent should be located after complete melting, and the vacuum should remove residual moisture without stripping the plasticizer. Loss of plasticizer during venting appears as an increase in melt viscosity and a loss of final flexibility.
Rheologically, the melt exhibits shear thinning. At very low shear rates in corrugator tooling, melt strength and relaxation can be sensitive to barrel temperature profile. In practical line audits, melt-pressure variation before the breaker plate should be kept below ±5% to avoid pulsation in wall thickness. Output and haul-off speed are balanced so that drawdown remains within the grade’s melt-extension limits; excessive drawdown raises molecular orientation and can reduce hoop stress capability in small-diameter tubing.
Cooling water temperature and vacuum sizing pressure are application-specific. For circular tube, water at 20°C to 40°C is commonly used, with the vacuum level set to maintain dimensional tolerance without drag marks. Because black compounds absorb radiant heat more efficiently than natural compounds, infrared barrel heating may show differences in surface temperature at the same heater output; pyrometer calibration against contact thermocouples is advisable on start-up.
Thermo-oxidative degradation of PA12 is accelerated when melt temperature rises above 250°C and residence time extends beyond approximately 10 min. Under these conditions, chain scission and crosslinking reactions can alter melt volume-flow rate and produce gel particles that appear as surface defects. The plasticizer present in X7297 black 9.7507 can additionally migrate toward the hot die lip, forming plate-out deposits that disrupt surface gloss and dimensional control. Production lines therefore monitor melt temperature at the screw tip and in the die adapter. Alarm limits are often set at 260°C, with a shutdown interlock at 280°C, although published data for this specific compound’s degradation kinetics is limited.
When processing begins after a shutdown, purge with a higher-viscosity unplasticized PA12 is common until the melt stream is clear. Carbon black residues can accumulate in dead spots behind breaker plates and static mixers; dismantling of a screw or die after a colour change from black to natural often reveals black streaking if residence time control was inadequate. Those observations reflect production-scale single-screw line behaviour rather than laboratory ageing data.
Melt volume-flow rate measurement under ISO 1133-1:2022 before and after extrusion provides a numerical control parameter. A shift in MVR outside the supplier’s lot specification indicates polymer degradation or contamination. For PA12, MVR test conditions of 235°C and 5 kg are typical, but the condition must be verified against the product datasheet.
In fluid-handling and pneumatic applications, the material is fabricated into monolayer or corrugated tube on vacuum sizing lines. Finished tube is tested for dimensions, burst pressure, and low-temperature impact according to the applicable assembly standard. For commercial vehicle air brake tubing, SAE J844 is a common reference. For automotive fuel and vapour lines, the finished assembly is qualified under the OEM-specific hydrocarbon permeation and extraction protocols. Because the X7297 grade contains a plasticizer, an extracted hardness shift can occur after continuous exposure to aggressive oxygenated fuels; pre-qualification immersion testing at 60°C or per the OEM schedule is therefore used to detect excessive plasticizer loss.
For cable jacketing and cable sheathing, the low density and moisture stability reduce the contribution of absorbed water to signal attenuation. The black colour number 9.7507 provides some resistance to ultraviolet degradation, though carbon black effectiveness depends on particle size, dispersion, and loading. Outdoor weathering is evaluated by ISO 4892-2 exposure and by retention of tensile properties after weathering. In conduit applications, the plasticized PA12 allows routing around tight radii without notched stress cracking under low-temperature impact; the specific minimum bend radius should be derived from tube diameter and wall thickness, not from material classification alone.
In automotive push-in fittings, tubing surface finish and Shore hardness control the sealing force. Because plasticized PA12 is softer than unplasticized PA12, joint design may require a different insert or clamp geometry. Published data for this specific configuration is limited, and tensile pull-out tests should be performed on assembled fittings according to the relevant OEM standard.
PA12 is resistant to many aliphatic hydrocarbons, fuels, oils, salt solutions, and alkalis, but it is not resistant to strong mineral acids, phenols, or certain polar solvents at elevated temperature. The exact chemical resistance of a plasticized compound such as X7297 black 9.7507 can depart from unplasticized PA12 because plasticizer extraction may precede polymer attack. In fuel environments, the plasticizer can be partially extracted by oxygenated components such as methanol or ethanol, leading to a measurable increase in flexural modulus and loss of low-temperature flexibility. This is a known operational boundary: qualification for long-term fuel contact should include immersion in the actual fuel blend at the maximum service temperature and subsequent tensile testing.
Moisture uptake in PA12 is much lower than in short-chain polyamides, but it is not zero. Under ISO 62 conditions, standard PA12 reaches a saturated moisture uptake near 1.5%; the plasticized X-series may show a similar or slightly different value depending on plasticizer hydrophilicity and carbon black loading. Dimensional changes in humid service are therefore smaller than for PA6 or PA66, but moisture equilibrium still carries an effect on stiffness. For precision tubing, conditioning to ISO 291 is necessary before dimensional inspection.
| Property | PA12 | PA6 | PA66 |
|---|---|---|---|
| Melting temperature by ISO 11357-3 | 178°C | 220°C | 260°C |
| Saturated water uptake by ISO 62 | 1.5% | 9.5% | 8.5% |
| Typical density | 1.01 g/cm³ | 1.14 g/cm³ | 1.14 g/cm³ |
Values in the table are typical for unplasticized base polymers and are provided to illustrate the platform difference; they do not constitute specification limits for black 9.7507. The plasticizer reduces the PA12 modulus and may lower the apparent glass-transition response, but it does not eliminate the permeability and moisture-absorption characteristics of the base material.
For regulatory documentation, material suppliers typically provide statements for RoHS, REACH, and food-contact use where applicable. The specific black 9.7507 pigment preparation may contain carbon black of controlled purity. If the finished article is used in potable water or medical contact, the grade must be evaluated against the relevant end-use standard, such as NSF/ANSI 61 for water-contact components or ISO 10993 for medical devices. No statement here substitutes for the manufacturer’s current compliance certificate.
Quality control at extrusion plants typically includes incoming melt volume-flow rate, residual moisture, and lot-specific tensile specimens. The melt flow ratio is tracked because plasticizer loss or hydrolytic chain scission changes flow behaviour before mechanical properties are visibly affected. Dimensional checks on extrudate are paired with burst testing for tube lots, and the results are statistically charted against the supplier’s specification window.
In multi-layer tube constructions, X7297 black 9.7507 may serve as the outer jacket or inner liner depending on the tie-layer chemistry. Adhesion to LLDPE, PBT, or fluoropolymer layers requires corona treatment or a functional tie resin, and peel adhesion is measured on a tensile test machine at a defined peel angle. Production trials on coextrusion lines with multi-layer die temperatures below 250°C are used to establish the layer ratio and interlayer bond.
