| HS Code | 485196 |
| Density | 1.01 g/cm³ |
| Melting Point | 178 °C |
| Tensile Modulus | 1400 MPa |
| Tensile Stress At Yield | 35 MPa |
| Elongation At Break | >200% |
| Charpy Impact Notched 23 C | 20 kJ/m² |
| Charpy Impact Notched 40 C | 10 kJ/m² |
| Shore D Hardness | 55 |
| Water Absorption 24 H | 0.3% |
| Vicat Softening Temperature | 145 °C |
| Heat Deflection Temperature 0 45 Mpa | 90 °C |
As an accredited Evonik VESTAMID® NRG 1902 BK Nylon 12, Impact Modified factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Evonik VESTAMID NRG 1902 BK Nylon 12 is supplied as impact-modified pellets in sealed 25 kg moisture-resistant bags. |
| Container Loading (20′ FCL) | 20′ FCL loaded with palletized, sealed bags of Evonik VESTAMID® NRG 1902 BK Nylon 12, secured and protected from moisture. |
| Shipping | VESTAMID® NRG 1902 BK Nylon 12 is supplied as impact-modified pellets, typically packaged in sealed moisture-barrier bags or drums. Shipment should be kept dry and protected from direct sunlight, humidity, and extreme heat. Standard non-hazardous handling applies; avoid prolonged exposure to moisture and store in a cool, ventilated area. |
| Storage | Store VESTAMID® NRG 1902 BK in its original, unopened packaging in a cool, dry, well-ventilated area. Keep away from direct sunlight, heat sources, and moisture, as nylon absorbs water. Maintain temperatures below 30°C. Use within two years of delivery to ensure optimal impact performance and processing consistency. |
| Shelf Life | Store in original sealed container, cool dry place. Shelf life typically 2 years from production if unopened. |
Low-pressure gas distribution networks that specify polyamide 12 for slow crack growth resistance and reduced installed weight relative to metallic alternatives process VESTAMID® NRG 1902 BK as a ready-to-extrude, carbon-black-pigmented, impact-modified compound. Drying in a desiccant hopper at 80 °C for 4 h to 6 h is required to reduce residual moisture to 0.10 % or lower; exceeding this limit during melt processing produces hydrolysis-induced molecular weight reduction, which is detected as a rapid loss of notched impact strength rather than a shift in melt flow index. The pipe line uses a single-screw extruder with a 30:1 L/D barrier screw and a grooved feed section, with barrel temperatures ramped from 190 °C in the feed zone to 230 °C at the adapter; melt temperature is held between 220 °C and 240 °C. Screw speed is set to maintain melt pressure at the screen changer below 250 bar, because impact-modified PA12 grades show shear heating and potential surface melt fracture at higher pressure-velocity conditions. Vacuum calibration and two-stage water cooling at 55 °C and 18 °C stabilize ovality within the pipe standard tolerance. The compound is certified against ISO 15439-1 for polyamide piping for gaseous fuels, with long-term hydrostatic strength data generated according to ISO 9080 and rapid crack propagation resistance assessed with the ISO 13477 S4 test. Finished products are SDR 11 and SDR 17.6 solid-wall pipes for distribution mains and service lines; the PA12 class carries an MRS value of 8.0 MPa, although grade-specific design coefficients require the pipe manufacturer’s validation. Reground start-up trimmings are limited to 15 wt% and are introduced only into the pipe core layer, never the outer surface, because carbon-black agglomerates at the external wall act as crack-initiation points in notched impact testing at −20 °C.
For heavy-duty truck and trailer air-brake circuits, the tube is produced from impact-modified PA12 to satisfy cold impact resistance and dimensional stability under compressed-air pressure pulses. A single-screw extruder with 25:1 L/D screw is fitted with a gear pump before the die to damp pressure oscillations; the melt temperature is constrained between 230 °C and 245 °C. The finished tube is drawn through a vacuum sizing tank and measured by a three-axis laser gauge. For a 8 mm nominal OD tube with 1 mm minimum wall, the production tolerance is held to ±0.05 mm on OD and ±0.03 mm on wall; excursions beyond this band create burst-pressure variation at coiled tube ends because the hoop stress distribution becomes asymmetric. The material is processed as-supplied without melt blending; start-up scrap may be reprocessed up to 10 wt% after re-drying to 0.10 % moisture, but higher regrind levels create melt-pressure drift from screen-blocking fines and cause diameter oscillations that exceed the dimensional limits of SAE J844. The tube product must qualify under SAE J844 for nonmetallic air brake system tubing and ISO 7628 for thermoplastic tubing in road vehicle air braking systems. Cold impact testing at −40 °C is used to verify that impact modification survives extrusion orientation; burst testing is performed at room temperature and at −40 °C to confirm that low-temperature embrittlement is not introduced by rapid water quenching. Terminal parts include main air supply lines, suspension control lines, and trailer gladhand lead hoses where the black grade provides UV stabilization without external jacketing.
In unbonded flexible riser construction, the outer sheath is crosshead-extruded directly over a helically wound or interlocked carcass, and the impact-modified PA12 grade serves as the seawater-facing barrier that must absorb vessel motion, wave fatigue, and low-temperature flexure without pinhole formation. The extrusion line typically uses a 120 mm single-screw machine with a 33:1 L/D barrier screw and a melt pump; head pressures of 120 bar to 180 bar are maintained to fill the annulus around the carcass without crushing the underlying layer. Melt temperature is controlled at 225 °C to 240 °C; excursions above 250 °C generate oxidative degradation of the impact modifier, detected as a yellow-brown tint shift and a drop in elongation at break measured on flattened sheath samples. The sheath is cooled in a segmented air-water ring rather than direct water immersion, because one-sided quenching creates differential crystallinity through the wall and residual stresses that later cause axial cracking under spooling strain. Wall thickness in dynamic riser service is typically 5 mm to 8 mm, with continuous ultrasonic thickness gauging used to reject thin bands below the manufacturer's specified minimum. The outer sheath is extruded from 100 wt% virgin compound; regrind is excluded from dynamic riser sheaths because low levels of crosslinked gel or carbon-black agglomerates become stress-concentration sites under repeated bending at −20 °C. For static riser sections, up to 5 wt% of internally generated, fully dried regrind may be introduced only after the extrusion batch has passed an API Spec 17J specified set of tensile, elongation, and hydrostatic ageing tests, but published data for this specific regrind configuration is limited. The sheath product is qualified under API Spec 17J for unbonded flexible pipe, with material ageing often assessed in hot water and synthetic seawater. The outer sheath is not the primary pressure containment layer, but its seawater barrier function is critical to preventing corrosion of the steel armour layers below. Final applications include dynamic riser systems, static flowlines, and jumper spools in offshore oil and gas production.
For high-voltage cable runs between the traction inverter and electric motor on commercial electric vehicles, the jacket compound must survive hot ambient temperatures, stone impact, and exposure to transmission fluid and road de-icing salts. The grade is applied as a thin-wall jacket by pressure extrusion in a crosshead die, with melt temperature between 220 °C and 235 °C to avoid distorting the underlying XLPE or silicone conductor insulation. Drawdown is minimized because excessive melt drawing reduces the impact-modified PA12 jacket’s notched impact retention; a draw ratio below 1.2:1 is maintained on the outer diameter. The jacket thickness is typically 0.5 mm to 1.0 mm for single-core cables rated up to 600 V AC or 900 V DC, depending on the vehicle architecture. The compound is used without additional color masterbatch or impact-modifier concentrate; it is supplied fully compounded with carbon black, and on-line melt filtration at 200 µm is specified to capture rare gel particles that would otherwise create jacket puncture sites. Electrical and mechanical requirements reference ISO 19642 for road-vehicle cables, with OEM specifications such as LV 112 supplementing environmental durability requirements; the compound complies with RoHS 2011/65/EU as a halogen-free jacketing material. A critical operational boundary is flame performance: unreinforced impact-modified PA12 is not inherently UL 94 V-0, so the jacket is not substituted for flame-retardant cable sheaths inside the battery pack or in enclosed high-temperature zones where self-extinguishing behaviour is mandated. The terminal product is an abrasion-resistant harness jacket for underfloor and motor-compartment cable runs where low-temperature flexibility to −40 °C is weighted more heavily than flame retardation.
Corrugated protection conduit for hydraulic hoses and cable bundles in agricultural and construction machinery is produced from the same impact-modified PA12 grade because the finished part must resist stone strike, diesel exposure, and sub-zero flexing at attachment points. The extruder feeds a corrugator with alternating vacuum forming blocks; melt temperature is maintained at 225 °C to 245 °C, and the melt must have sufficient viscosity to keep the corrugation walls from thinning at the inner crest. The process uses a melt pump and screens at 250 µm to prevent gel-induced blowouts. Regrind from start-up and rejected profiles is recirculated as a controlled fraction of the feed. At 10 wt% regrind, the impact failure mode remains ductile, but the transition is non-linear; at 20 wt% some low-temperature impacts shift toward brittle crack propagation through the corrugation root, and at 30 wt% the conduit fails by crack propagation rather than hinging at −30 °C. For outdoor machinery exposed to −40 °C road transport, the regrind ceiling is therefore set at 20 wt%, and only internally produced, moisture-controlled scrap dried to 0.10 % moisture is allowed. The conduit is evaluated under EN 61386-1 for cable management conduit systems, with impact tests at −25 °C or lower required by many machinery OEM specifications. The finished product is split and unslit corrugated tube with nominal outside diameters from 10 mm to 54 mm, used to protect hydraulic pilot lines and sensor cables on mobile equipment.
| Application | Primary standard | Critical test method | Processing boundary |
|---|---|---|---|
| Gas distribution pipe | ISO 15439-1 | ISO 13477 | Moisture ≤ 0.10 % |
| Automotive air-brake tubing | SAE J844 | ISO 7628 | OD tolerance ±0.05 mm |
| Flexible riser outer sheath | API Spec 17J | Hydrostatic ageing | Melt ≤ 250 °C |
| EV high-voltage cable jacket | ISO 19642 | UL 94 | Draw ratio < 1.2:1 |
| Corrugated conduit | EN 61386-1 | Low-temperature impact | Regrind ≤ 20 wt% |
| Subsea umbilical tube | ISO 13628-5 | Hydrostatic burst | Virgin compound only |
Subsea hydraulic control umbilicals use small-bore impact-modified PA12 tubes as the fluid conduit for methanol, glycol, and hydraulic control fluid. The tube is extrusion-mantled with a close tolerance on inner bore and wall because the tube must withstand collapse resistance during vacuum dewatering and burst pressure during hydraulic actuation. The extrusion line operates at melt temperatures of 230 °C to 245 °C with a single-screw extruder and in-line ultrasonic wall monitoring; the tube is pulled through a vacuum-sizing tank at controlled tension to prevent residual strain that would cause length retraction after spooling. Typical tube dimensions are 6.3 mm OD with 1.0 mm wall, or 9.5 mm OD with 1.5 mm wall, depending on the umbilical design and hydraulic fluid flow rate. The pressure boundary uses 100 wt% virgin compound; regrind is excluded from the inner tube because even well-dispersed contamination can reduce long-term burst strength under sustained pressure. Qualification follows ISO 13628-5 for subsea umbilicals, with the tube tested for hydrostatic burst, collapse resistance, and fluid compatibility; end fittings are qualified under API 17E for subsea production control systems. The finished product is a multiple-helix bundle of jacketed tubes, fillers, and steel armour wires, terminated at subsea distribution units and topside hydraulic power units. Published data for this specific impact-modified grade in methanol-contaminated high-pressure ageing is limited, so qualification often adds a project-specific ageing program at 70 °C in the selected control fluid.
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Evonik VESTAMID® NRG 1902 BK is a black-pigmented impact-modified polyamide 12 compound supplied in pellet form for extrusion and injection-molding operations requiring high ductility and resistance to slow crack growth. The base polymer is synthesized from laurolactam, producing an aliphatic polyamide with lower equilibrium moisture uptake than PA 6 or PA 66. The BK suffix denotes a controlled carbon black dispersion that provides ultraviolet stabilization during outdoor storage and influences the compound’s welding and dielectric behavior. Under ISO 1874-1, the material is classified as an impact-modified polyamide 12; the black color is designated by the BK code.
Typical values for this product class place density between 1.01 and 1.03 g/cm³ under ISO 1183-1. Melt volume-flow rate, measured at 190°C and 2.16 kg according to ISO 1133-1:2022, is usually held in the medium-viscosity range from 5 to 15 cm³/10 min. The medium-viscosity window permits consistent extrusion of pipe walls while retaining sufficient melt strength for vacuum calibration. The compound is designed primarily for polyamide gas-pipe systems covered by ISO 16486, where dimensional stability, low-temperature impact strength, and resistance to internal pressure-induced slow crack growth are design prerequisites.
Published datasheet values should be verified against the specific lot certificate, because carbon black dispersion, impact-modifier content, and melt-flow control can shift within the stated production tolerance. The ranges below are engineering comparisons for impact-modified polyamide 12 gas-pipe grades, not guaranteed specification limits for every shipment.
| Property | Test method | Typical range for impact-modified PA 12 gas-pipe grades |
|---|---|---|
| Density | ISO 1183-1 | 1.01–1.03 g/cm³ |
| Tensile modulus, 23°C | ISO 527-1/-2 | 250–450 MPa |
| Yield stress, 23°C | ISO 527-1/-2 | 18–25 MPa |
| Nominal strain at break | ISO 527-1/-2 | >150% |
| Notched Charpy impact, 23°C | ISO 179-1/1eA | >50 kJ/m² or no break |
| Notched Charpy impact, -30°C | ISO 179-1/1eA | 10–20 kJ/m² |
| Shore D hardness | ISO 868 | 55–65 |
| Vicat softening temperature, B50 | ISO 306 | 150–165°C |
| Melting temperature | ISO 11357-3 | 172–178°C |
| Melt volume-flow rate, 190°C/2.16 kg | ISO 1133-1:2022 | 5–15 cm³/10 min |
The addition of a discrete elastomeric phase to polyamide 12 reduces tensile modulus and yield stress while increasing notched impact strength and low-temperature ductility. For impact-modified PA 12 grades of this class, dry-as-molded tensile modulus measured under ISO 527-1/-2 typically appears in the range 250 to 450 MPa, compared with roughly 1,200 to 1,500 MPa for unmodified PA 12 at 23°C. The reduction in load-bearing stiffness is accompanied by an increase in elongation at yield and a large increase in notched impact energy absorption. Yield stress values under ISO 527-1/-2 commonly fall between 18 and 25 MPa, whereas unmodified high-viscosity PA 12 grades may exceed 40 MPa.
This trade-off is deliberate. In gas-pipe applications, high stiffness is less valuable than resistance to fracture initiation from scratches or stress concentrations. The impact modifier dissipates energy through cavitation and shear yielding at the modifier-matrix interface, effectively blunting cracks before unstable propagation can occur. Shore hardness, measured under ISO 868, is generally reduced to the 55 to 65 Shore D range relative to unmodified PA 12 values above 70 Shore D. The Vicat softening temperature, determined by ISO 306 Method B50, is usually reported from 150°C to 165°C, while the crystallite melting temperature remains near 172°C to 178°C under ISO 11357-3.
In a pressurized pipe, the lifetime-limiting mechanism is often slow crack growth from surface defects or inclusions. Impact modification in NRG 1902 BK changes the craze-to-crack transition because the elastomer domains undergo void nucleation while the PA 12 matrix undergoes shear yielding. This results in higher energy absorption per unit crack length compared to unmodified PA 12. The PA 12 matrix glass transition temperature in dry condition is typically near 40°C to 55°C by dynamic mechanical analysis, while the elastomer phase exhibits sub-ambient transitions that preserve ductility in cold-soak conditions. These morphological features are assessed indirectly through notched Charpy impact under ISO 179-1/1eA, which may exceed 50 kJ/m² at 23°C and remain above 10 to 15 kJ/m² at -30°C for impact-modified PA 12 compounds of this type.
Pre-drying is mandatory when moisture content exceeds 0.1% by weight. Polyamide 12 absorbs less water than PA 6 or PA 66, but saturated pellets exposed to humid air can still hydrolyze during processing. Desiccant drying at 80°C for 4 to 8 h with a dew point at or below -30°C brings residual moisture below the threshold. Drying air temperature should not exceed 90°C because prolonged exposure at elevated temperature causes oxidative yellowing and molecular-weight degradation.
For single-screw pipe extrusion, barrel lengths of 30:1 to 33:1 L/D with barrier screws and grooved feed sections are used. Barrel temperatures are typically profiled from 200°C at the feed section to 230°C at the metering section, with die head settings from 220°C to 240°C. Melt temperature measured directly at the die should remain below 250°C; excursions above 260°C accelerate thermal degradation, producing free acid groups and gel particles that degrade pipe surface quality and long-term hydrostatic strength. Screw speed and back pressure must be adjusted so that residence time does not exceed 10 to 15 min at the upper end of the melt-temperature range.
Injection molding of fittings uses melt temperatures between 220°C and 260°C, with mold temperatures from 20°C to 80°C. Higher mold temperatures in the 60°C to 80°C range produce better weld-line strength and dimensional stability in thick-walled sections, but increase cycle time. Gate freeze-off is faster than in unmodified nylon 12 because the impact modifier reduces crystallinity and thermal conductivity; therefore, hold-pressure time must be extended relative to equivalent unmodified grades to avoid sink marks and internal voids.
Production-scale observations indicate that moisture above 0.15% generates splay, die drool, and inconsistent wall thickness in vacuum-calibrated pipe lines. The problem is amplified in high-humidity plants because PA 12 re-adsorbs moisture quickly after drying; hopper residency should be limited and blanketed with dry air if ambient relative humidity exceeds 60%.
| Processing parameter | Operational boundary | Primary failure consequence |
|---|---|---|
| Residual moisture after drying | <0.1% by weight | Hydrolysis, melt viscosity loss, pipe surface splay |
| Drying air dew point | ≤ -30°C | Incomplete moisture removal |
| Melt temperature at die | ≤ 250°C | Thermal degradation, gel particle formation |
| Barrel length-to-diameter ratio | 30:1–33:1 | Plasticization inconsistency |
| Mold temperature | 20–80°C | Weld-line weakness or sink marks |
| Hopper ambient relative humidity | < 60% | Rapid moisture re-adsorption before processing |
Rheological behavior under capillary conditions shows that impact-modified PA 12 is shear-thinning. At pipe extrusion wall shear rates between 10 and 1,000 s−1, viscosity is governed by molecular weight, modifier phase size, and carbon black loading. Lower-viscosity PA 12 extrudes at higher throughput but may sag in large-diameter pipe, while higher-viscosity versions improve melt strength but increase screw torque and melt temperature. The medium-viscosity designation of NRG 1902 BK is therefore positioned to balance these competing requirements.
Melt pressure at the die entrance is sensitive to carbon black agglomeration and moisture. A rise in die pressure at constant screw speed can indicate insufficient dispersion or the onset of gel formation from thermal degradation. Screen packs with 40/60/80 mesh stacks and breaker plates are common in gas-pipe extrusion; pressure drop across the screen should be monitored to prevent shear heating. Melt pumps are used to isolate die pressure from extruder surges and reduce pipe wall-thickness variation.
In pressurized gas pipe service, the critical long-term failure mode is slow crack growth initiated at surface scratches, pigment agglomerates, or poor weld interfaces. The elastomeric modifier in NRG 1902 BK lowers the craze propagation rate by dissipating stress intensity at the damage zone, which is reflected in notched Charpy values exceeding 50 kJ/m² at 23°C under ISO 179-1/1eA. At -30°C, class-typical values remain above 10 to 15 kJ/m², allowing installation in cold climates without brittle fracture.
The hydrostatic strength of pipes made from NRG 1902 BK must be established by pipe manufacturers according to ISO 16486. Resin melt flow, density, and tensile properties are used as lot-to-lot quality checks, but pipe burst and sustained pressure tests are the governing design data. Carbon black dispersion is checked to prevent agglomeration, which can act as stress concentrators and shorten pipe life under cyclic pressure. Published data for full-scale pipe performance in this specific configuration is limited; therefore, end-use qualification should include hydrostatic strength, slow crack growth, and fusion-joint tests rather than relying solely on resin property tables.
Within the VESTAMID NRG family, the designated impact-modified grade differs from unmodified polyamide 12 gas-pipe grades mainly in molecular architecture and the presence of an elastomeric dispersed phase. The unmodified analogue will ordinarily exhibit a dry tensile modulus above 1,200 MPa and a Shore D hardness above 70, while NRG 1902 BK operates in the 250 to 450 MPa tensile modulus range and 55 to 65 Shore D hardness range. This repositioning of properties is not a defect; it is a deliberate trade-off that favors crack arrest and low-temperature toughness over stiffness and surface hardness.
Relative to semi-flexible or plasticized PA 12 grades outside the NRG series, NRG 1902 BK does not rely on external monomeric plasticizers for flexibility. The impact modifier phase provides toughening while limiting the migration and volatile-condensate issues associated with some plasticized compounds. It also differs from extruded PA 12 used in cable protection by the presence of gas-pipe-specific carbon black dispersion and by the narrower melt-flow control required for sustained pressure service.
Operational boundaries include the requirement to avoid melt temperatures above 250°C to 260°C and moisture contents above 0.1%. The compound is not recommended for prolonged contact with concentrated mineral acids, phenols, or high-temperature glycol solutions because these media can attack the polyamide backbone. Regrind levels should be limited to 20% by weight for gas-pipe applications, because repeated heat histories degrade the impact modifier phase and shift the melt-flow response. Processors should also avoid blending NRG 1902 BK with unmodified PA 12 scrap at high percentages, as this dilutes the impact-modifier concentration and produces inconsistent low-temperature toughness. Published data for this specific configuration is limited for chemical exposure and long-term outdoor weathering; service life for non-gas applications must be validated on the finished article.
