| HS Code | 257381 |
| Material | Evonik VESTAMID® NRG 2901 BK Nylon 12 |
| Density | 1.01 g/cm³ |
| Melting Point | 178 °C |
| Tensile Strength | 40 MPa |
| Elongation At Break | 350% |
| Flexural Modulus | 1100 MPa |
| Charpy Impact Strength 23 C | No break |
| Charpy Notched Impact Strength 23 C | 11 kJ/m² |
| Shore Hardness | D 70 |
| Water Absorption 24h | 0.2% |
| Water Absorption Saturation | 1.6% |
| Vicat Softening Temperature | 170 °C |
As an accredited Evonik VESTAMID® NRG 2901 BK Nylon 12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | VESTAMID® NRG 2901 BK Nylon 12 is supplied in moisture-protective, sealed 25 kg bags, preventing contamination and preserving quality during transport. |
| Container Loading (20′ FCL) | 20′ FCL: packed on pallets, stowed tightly, secured against shifting, protected from moisture and contamination during transport. |
| Shipping | Ship VESTAMID® NRG 2901 in sealed, moisture-proof packaging to prevent contamination. Keep dry and protected from heat, direct sunlight, and mechanical damage. Transport in clean, covered vehicles or containers with adequate ventilation. No special hazard classification applies, but avoid exposure to excessive dust and follow standard safe handling procedures. |
| Storage | Store Evonik VESTAMID® NRG 2901 BK Nylon 12 in its original, sealed packaging to prevent moisture uptake. Keep in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and strong oxidizers. Ideal storage temperature is below 30°C. Ensure the area is clean and protected from mechanical damage. |
| Shelf Life | Shelf life is typically 2 years from manufacture if stored in original, sealed packaging in a cool, dry place. |
In subsea unbonded flexible pipe liner manufacture, VESTAMID NRG 2901 BK is processed as 100 wt% base thermoplastic without additional carbon black masterbatch; converters introducing production regrind cap it at 20 wt% after vacuum drying at 80°C for 4 h to residual moisture at or below 0.10%, because hydrolytic chain scission in the melt above 230°C produces measurable loss in notched impact energy. The liner is extruded over a stainless steel interlocked carcass on a rotating mandrel line using a single-screw extruder with L/D ≥ 30:1, a barrier screw, and a die gap of 1.2–1.8 mm; barrel temperature is ramped from 180°C at the feed throat to 235°C at the metering zone, while melt temperature is held at 215–235°C. At plant relative humidity above 60%, hopper drying at 80°C is required to prevent surface defects associated with steam volatilization in the melt. Throughput instability above 60 rpm has been documented as intermittent shark-skin melt fracture when die exit pressure exceeds 9 MPa. Compliance for sour-service qualification follows API Spec 17J, API TR 17TR2, and ISO 13628-2:2010, with material acceptance tests including tensile elongation per ASTM D638-14, melt flow rate per ISO 1133-1:2022 at 235°C/2.16 kg, and hardness per ISO 868. For amine-containing process fluids, the liner operational boundary is set by the converter's rapid gas decompression protocol; published data for continuous sour-gas service above 60°C in this specific grade are limited. Terminal products are rough-bore and smooth-bore flexible risers, subsea flowlines, jumpers, and export lines in which the extruded PA12 liner is the sealed polymer layer directly contacting produced hydrocarbon fluids.
A production bottleneck observed on horizontal sheathing lines for steel-tube umbilicals is vacuum calibration collapse of the PA12 sheath when haul-off is increased beyond 12 m/min at wall thickness 2.0 mm; the pressure drop across the calibrator sleeve must remain below 45 kPa to avoid flattening the still-molten core. The material is charged as 100% virgin VESTAMID NRG 2901 BK with no in-line pigmentation, because the pellet already contains carbon black dispersion sufficient for outdoor UV stabilization; in co-extruded constructions where a thin tie layer promotes adhesion to a thermoplastic elastomer inner jacket, the PA12 sheath constitutes 80–95% of total outer layer thickness. Production is performed on a 30:1 L/D single-screw extruder with a pressure-type die and vacuum sizing tank, melt temperature at 210–230°C, and residual moisture at or below 0.08% prior to feeding. Compliance is assessed against ISO 13628-5:2010, API 17E, and NORSOK M-710 for qualification of non-metallic materials in subsea service, with tensile retention after 1,000 h immersion in synthetic seawater at 70°C measured via ISO 527-2:2012. An operational incompatibility is documented in continuous immersion in hot methanol above 40°C, where environmental stress cracking initiates at sheath weld lines before bulk tensile failure. Terminal products are subsea control umbilicals, dynamic power cables, hydraulic flying leads, and subsea production control jumpers.
| Route | Melt temperature | Residual moisture limit | Primary equipment | Production boundary |
|---|---|---|---|---|
| Flexible pipe liner | 215–235°C | 0.10% | Rotating mandrel extruder L/D ≥ 30:1 | Die exit pressure 9 MPa |
| Umbilical sheathing | 210–230°C | 0.08% | Pressure extrusion L/D 30:1 | Haul-off 12 m/min at 2.0 mm wall |
| Multilayer air brake tube | 190–230°C | 0.08% | Three-layer spiral mandrel co-extruder | Outer die gap 0.8–1.2 mm |
| Gas service pipe | 215–230°C | 0.10% | Single-screw pipe extruder L/D 30:1 | Cooling water 40°C |
| Fuel quick coupling moulding | 235–245°C | 0.10% | Injection moulding machine 800–1,600 kN | Injection speed 80 cm³/s |
| Cable gland moulding | 200–230°C | 0.10% | Three-plate injection tool | Back pressure 5–8 MPa |
When PA12 replaces PA11 in heavy-duty truck air brake tubing, the converter's multilayer line must manage the viscosity mismatch between the outer VESTAMID NRG 2901 BK skin layer and the PBT or PA66 core layer; layer thickness addition ratios in a three-layer PA12/PBT/PA12 construction are typically specified at 20–30% outer skin, 40–50% PBT core, and 25–30% inner skin, with the PA12 layers carrying low-temperature impact resistance at -40°C per SAE J844-12 and ISO 7628:2010. The production process uses a three-layer spiral mandrel co-extrusion die with individual barrel temperature profiles of 190–230°C for the PA12 layers; moisture in the PA12 layer must remain below 0.08% before entering the feed throat, and the outer die gap is kept at 0.8–1.2 mm to limit die swell and preserve concentricity. On production lines running 60 m/min or faster, the outer PA12 skin has exhibited post-extrusion ovality when the cooling tank was operated below 15°C because rapid quenching locks in asymmetric residual stress. Material acceptance for the PA12 layers includes tensile elongation after fuel and oil immersion per ASTM D638-14, flexural modulus per ISO 178:2019, and low-temperature impact per ISO 179-1:2010 at -40°C. Terminal products are coiled trailer air brake tubes, cab line sets, and prefilled pneumatic chassis harnesses.
For low and medium pressure gas service laterals installed below 10 bar, the VESTAMID NRG 2901 BK compound is used as 100 wt% virgin extrusion feedstock because gas utilities typically reject post-industrial regrind in butt-fusion joints; if regrind is permitted under converter internal qualification, maximum addition is 10 wt% after lot-specific melt flow stability verification per ISO 1133-1:2022. The pipe is produced on a 30:1 L/D single-screw extruder with a spiral mandrel die and vacuum-sizing tank, with barrel temperatures from 185°C to 225°C and melt temperature at 215–230°C; because PA12 crystallizes slowly, the cooling water temperature is held at 40°C to minimize spherulitic stresses that reduce hydrostatic design basis. Industry compliance for PA piping in gaseous fuel service is anchored in ISO 16486-1:2020 and ISO 16486-2:2020, with mechanical release testing of fusion joints performed under ISO 13953:2001. Published data for this specific VESTAMID grade in hydrogen-blended gas service above 5 vol% hydrogen are limited; converters must perform material compatibility testing per ISO 23936-1:2022 or national hydrogen readiness programs before use. Terminal products are service tees, lateral gas lines, and meter set assemblies in urban distribution networks.
The conversion of VESTAMID NRG 2901 BK into fuel-system quick couplings uses 100% pellet feed without glass-fibre reinforcement; the absence of filler preserves the high elongation needed for snap-fit barb engagement. Moulding is performed on a hydraulic injection moulding machine with clamp force from 800 kN to 1,600 kN depending on cavity count, a general-purpose screw with L/D 20:1, and a nozzle temperature of 235–245°C; the mould temperature is held at 60–80°C to control PA12 shrinkage at 0.012–0.015 mm/mm and to reduce post-mould dimensional drift in ethanol-containing fuel. The addition ratio in assembled fuel lines is not a bulk formulation factor but an assembly proportion: the PA12 connector typically represents 2–5 wt% of the finished fuel line assembly by weight. Qualification follows SAE J2044:2009 for quick connection systems, ISO 16047 for tightening torque on threaded retaining elements, and ASTM D638-14 for tensile elongation after fuel immersion; low-temperature burst resistance is evaluated at -35°C using the assembly-level pressure test specified in SAE J2260. Failure in production tooling has been observed as stress whitening at the gate vestige when injection speed exceeds 80 cm³/s, corresponding to cavity pressure above 50 MPa; that boundary limits cycle time more than melt residence time. Terminal products are gasoline and diesel fuel line quick connectors, vapour recovery fittings, and fuel sender unit lock rings.
Where an injection-moulded PA12 cable gland body must survive repeated cable flexing and seawater washdown on an offshore crane apron, VESTAMID NRG 2901 BK is dosed at 100% virgin resin with no additional carbon black; if regrind from cold runner systems is used, it is limited to 15 wt% after the ground material has been re-dried to 0.10% moisture, because higher regrind levels reduce the impact strength result under IEC 62262:2019 for IK impact ratings. The moulding process employs a three-plate tool with a submarine gate into a thick boss section; barrel temperature is set at 200–230°C, mould temperature at 50–70°C, and back pressure at 5–8 MPa to maintain dimensional stability of the metric thread array. Compliance for marine and industrial cable glands references IEC 62444:2010, EN 62444 at national adoption level, and UL 94 HB for flammability classification where hazardous-area certification is not required; for ATEX/IECEx Ex e or Ex d applications the convertor must demonstrate non-metallic material suitability through the relevant Notified Body file, and published VESTAMID-specific data for ATEX surface resistivity and thermal endurance are limited. Operational incompatibility is documented with strong organic solvents such as methyl ethyl ketone and with continuous immersion in hot methanol above 40°C, which induces environmental stress cracking at moulded-in thread roots. Terminal products are polyamide cable glands for offshore junction boxes, industrial control cabinets, and wind turbine nacelle entry plates.
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VESTAMID NRG 2901 BK is a black-pigmented, semi-crystalline polyamide 12 compound positioned within Evonik’s energy-market VESTAMID NRG range. The polyamide 12 backbone contains one amide linkage per 11 methylene units, giving it a lower amide density than polyamide 6 or polyamide 66. That structural feature reduces equilibrium water uptake and dimensional swelling in wet hydrocarbon service. The BK suffix identifies carbon black pigmentation, which produces an opaque wall and provides ultraviolet screening during outdoor storage. In oil and gas fluid transport, the grade is used for internal sheaths, liners, and small-bore pipe where hydrolytic stability and impact resistance are required. The material is supplied as pellets and is normally handled as an extrusion-grade compound rather than as a general-purpose injection molding material. Residual moisture at packaging is controlled to 0.10% by weight or lower because melt processing above 230 °C in the presence of free moisture accelerates amide bond hydrolysis and reduces molecular weight retention.
Supplier documentation for the grade typically reports density in the range of 1.01–1.02 g/cm³ when measured according to ISO 1183-1 and a differential scanning calorimetry melting peak of 175–178 °C under ISO 11357-3 at a heating rate of 10 K/min. Dry-as-molded tensile specimens show yield stress in the range of 18–24 MPa and nominal strain at break above 200% under ISO 527-2/1B/20. The reported flexural modulus is commonly 350–450 MPa under ISO 178. These property windows are typical rather than lot-specific; current certificates of analysis should be used for production release because carbon black dispersion and molecular weight control produce batch-to-batch variation.
The grade is separated from unpigmented VESTAMID extrusion compounds by the combination of a high-molecular-weight PA12 base and carbon black pigmentation. In the melt state, NRG 2901 BK exhibits shear-thinning behavior typical of a high-viscosity PA12 extrusion resin. Unfilled, unpigmented PA12 grades may exhibit higher melt volume-flow rates and are frequently selected for injection molding or thin-wall extrusion. The black grade is configured for pipe, liner, and sheath applications where melt strength, sag resistance, and low-temperature toughness are more important than rapid cavity filling. Carbon black also changes melt rheology and filtration behavior; screen packs and melt pumps experience higher pressure drop than with natural PA12 at equivalent throughput.
Compared with polyamide 11, the PA12 backbone lowers the crystalline melting peak by roughly 10 K and reduces saturation water absorption to approximately 1.3–1.7% under ISO 62. The lower moisture uptake reduces dimensional shift in wet service and stabilizes tensile properties after prolonged exposure to water-bearing hydrocarbon streams. Compared with polyamide 6 and polyamide 66, polyamide 12 has a lower amide group concentration, which reduces hygroscopic swelling and yields more consistent mechanical response in humid environments. The trade-off is lower absolute tensile modulus and lower continuous-use temperature than short-chain aliphatic polyamides.
Carbon black in NRG 2901 BK is selected for ultraviolet stabilization and opacity rather than as an electrical conductivity modifier. Users requiring static dissipative behavior should verify surface resistivity under IEC 62631-3-2 because the product is not necessarily formulated to meet conductive or antistatic thresholds. The black wall permits visual and laser-based defect detection in extruded pipe, whereas natural translucent PA12 can obscure weld lines and embedded contamination. This is a practical difference in production, particularly for small-diameter pipe inspected by camera or laser profilometry.
Moisture is the primary process variable for PA12 extrusion. At 0.10% residual moisture by weight, hydrolytic chain scission remains limited during ordinary melt residence. At 0.20%, apparent melt flow can increase and the tensile elongation of finished pipe can fall below design minimums because water attacks amide linkages and lowers number-average molecular weight. Reduced molecular weight lowers melt strength, which produces parison sag, poor concentricity, or sink marks in thick sections. Drying to 0.08% by weight or lower is therefore specified before first heat. For black polyamide 12 compounds, Karl Fischer titration is preferred over infrared moisture analysis because carbon black absorbs infrared energy and can distort weight-loss readings unless the instrument calibration is compound-specific.
A closed-loop desiccant dryer with a dew point no higher than -30 °C and bed temperature of 80–100 °C is normally used for 4–8 h. Dried pellets require dry-air conveying to the feed hopper. Extended residence in an unblanketed hopper permits surface moisture uptake, especially when plant humidity exceeds 50% relative humidity at 23 °C. Hopper dryers are therefore preferred over ambient hoppers for continuous pipe lines. Melt processing is usually performed at 230–260 °C, with the exact profile adjusted for screw geometry, die pressure, and output rate. Temperatures above 270 °C should be avoided because thermal degradation can occur if residence time exceeds approximately 15 min, particularly in low-throughput operations with deep screw channels.
A grooved-barrel single-screw extruder used for pipe production frequently operates with an L/D ratio of 30–36. Feed-zone temperatures are held near 180–200 °C, the compression zone near 220–250 °C, and the metering zone near 240–260 °C. Spiral mandrel or basket dies with compression ratios from 1.5:1 to 3:1 are common. Die pressure varies with diameter, spider leg design, and output, but melt pressures of 150–350 bar are encountered on production-scale small-bore lines. High melt viscosity can dominate throughput limits because torque and melt pressure rise before screw melting capacity is exhausted. Downstream cooling is normally set to control crystallite size and post-extrusion shrink; water bath or air gap temperatures of 40–60 °C are representative, but the optimum depends on wall thickness and line speed.
During extrusion of black grades, carbon black agglomerates can act as filterable solids. A barrier screw with compression ratio of 2:1 to 2.5:1 disperses pigment without generating excessive viscous dissipation. If screw speed is raised too aggressively, shear heating can push melt temperature above the recommended ceiling and produce black specks from degraded pigment-polymer interfaces. A screen pack of 60/120/60 mesh is commonly installed for pipe-grade PA12. Pressure buildup across the screen pack is monitored; an increase above 150 bar is often used as a replacement point to prevent melt stagnation and the subsequent release of degraded material into the product wall.
For injection molding of thick fittings from NRG 2901 BK, mold temperature is typically maintained at 40–80 °C to promote uniform crystallization and reduce weld-line weakness. A general-purpose polyolefin screw may not provide adequate homogenization for this grade; a screw with a non-return valve and L/D of 20–24 is normally used. Injection pressures of 800–1200 bar are often required for sections thicker than 2 mm. Short shots and sink marks are corrected by holding pressure and gate seal time rather than by raising melt temperature, because higher melt temperature lowers viscosity but increases hydrolysis and thermal degradation risk.
Black pigmentation in NRG 2901 BK limits ultraviolet oxidative degradation at the outer pipe surface during outdoor storage. Accelerated weathering comparisons under ISO 4892-2 using xenon-arc lamps and daylight filters are used to assess surface cracking and tensile property retention. Unpigmented PA12 grades require additional UV stabilizer packages for the same exposure; the black grade integrates the screening pigment into the compound. In wet hydrocarbon service, the lower amide concentration of PA12 limits water plasticization. Saturation water absorption of 1.3–1.7% under ISO 62 corresponds to a smaller modulus shift than that seen with polyamide 6 or polyamide 66, which can absorb 9–10% and 7.5–8.5% water respectively. This difference is a primary reason PA12 is selected over short-chain polyamides for water-bearing gas lines and offshore piping.
The material is not suitable for continuous exposure to strong mineral acids, strong oxidizing agents, or high concentrations of polar solvents that attack the amide bond. Published data for this specific NRG 2901 BK formulation under high H2S partial pressure or very low pH produced water is limited. Sour-service qualification must be performed against the current supplier chemical resistance documentation and field-relevant gas composition. The absence of publicly available data for a specific acid gas mixture should not be interpreted as approval or rejection; it is an operational boundary that requires testing.
In unbonded flexible riser construction, a PA12 internal pressure sheath may be evaluated under API SPEC 17J. Rapid gas decompression resistance, creep, and fluid compatibility are part of the qualification matrix. Carbon black pigmentation assists in online defect detection during liner extrusion because natural PA12 translucency can hide weld lines. In spoolable pipe, the compound is used as the inner liner or pressure barrier; it is not a stand-alone high-pressure containment layer. Collapse resistance, permeation, and reinforcement design are separate system-level calculations that depend on pipe diameter, wall thickness, service depth, and annulus conditions.
| Polymer | Melting peak | Saturation water absorption | Density | Primary test standards |
|---|---|---|---|---|
| PA12 | 175–178 °C | 1.3–1.7% | 1.01–1.02 g/cm³ | ISO 11357-3, ISO 62, ISO 1183-1 |
| PA11 | 185–190 °C | 1.8–2.2% | 1.03–1.05 g/cm³ | ISO 11357-3, ISO 62, ISO 1183-1 |
| PA6 | 220–225 °C | 9.0–10.0% | 1.13–1.15 g/cm³ | ISO 11357-3, ISO 62, ISO 1183-1 |
| PA66 | 260–265 °C | 7.5–8.5% | 1.13–1.15 g/cm³ | ISO 11357-3, ISO 62, ISO 1183-1 |
These comparative values illustrate general polyamide family differences rather than lot-specific NRG 2901 BK certification data. Carbon black and processing additives shift thermal transitions, moisture absorption kinetics, and mechanical response. The current supplier datasheet and lot certificate should therefore govern release limits, while the table is useful for material selection when wet-service dimensional stability is a design priority.
On extrusion lines producing black pipe for field installation, joints may be assembled by electrofusion or butt fusion. Butt fusion welding of polyamide 12 requires surface planing, controlled upset force, and heater plate temperatures specific to the melt characteristics of the grade. Heater plate temperatures of 220–240 °C are representative for PA12 pipe welding, but the optimum is verified by bead appearance and destructive bend testing. Joint integrity in critical service is confirmed by hydrostatic pressure testing under ISO 1167. Pipe stored at high humidity before welding should be re-dried or surface-conditioned because moisture at the weld interface can generate porosity and reduce weld toughness. These field-operational limitations are part of the overall process window for NRG 2901 BK and should be captured in installation procedures for black polyamide 12 line pipe.
