| HS Code | 854605 |
| Density | 1.01 g/cm³ |
| Melting Point | 178 °C |
| Vicat Softening Temperature | 135 °C |
| Tensile Modulus | 1200 MPa |
| Tensile Stress At Yield | 38 MPa |
| Elongation At Yield | 4.5 % |
| Tensile Stress At Break | 45 MPa |
| Elongation At Break | 250 % |
| Charpy Impact Strength At 23 C | No break |
| Charpy Impact Strength At 40 C | No break |
| Shore Hardness D | 65 |
| Water Absorption At Saturation | 1.3 % |
| Thermal Expansion Coefficient | 1.8 × 10⁻⁴ K⁻¹ |
| Electrical Resistivity | 1 × 10¹³ Ω·cm |
As an accredited Evonik VESTAMID® NRG 1001 PA 12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied as free-flowing PA12 pellets in sealed 25 kg polyethylene bags, palletized and protected for safe transport and storage. |
| Container Loading (20′ FCL) | 20′ FCL shipment of Evonik VESTAMID® NRG 1001 PA12, packed in sealed containers, secured palletized loads, ensuring safe transport. |
| Shipping | VESTAMID NRG 1001 is shipped as dry, free-flowing granules in sealed, moisture-proof bags on pallets. Protect packaging from rain, condensation, and excessive heat during transport. Store in a cool, dry area and use within the specified shelf life. Not classified as hazardous for standard freight. |
| Storage | Store VESTAMID® NRG 1001 PA 12 in its original, sealed packaging in a cool, dry, well-ventilated area. Protect from direct sunlight, UV exposure, and high temperatures, as moisture and heat can degrade the material. Keep away from open flames and ignition sources. Use within shelf life and reseal any opened containers promptly. |
| Shelf Life | Shelf life is typically 2 years when stored unopened in a cool, dry place away from direct sunlight and moisture. |
For unbonded flexible risers conveying sour crude oil and associated gas, VESTAMID NRG 1001 PA12 is converted into the internal pressure sheath, a continuous polymer cylinder that isolates produced fluids from the steel carcass and armor layers. The material is fed as 100 wt% neat resin; neither plasticizer nor particulate filler is introduced into the internal sheath layer because particulate addition above 2.0 wt% raises notch sensitivity and can accelerate crack propagation under cyclic bending. Where an outer weathering layer is coextruded on the same riser, carbon black masterbatch is added at 3.0–5.0 wt% so that the final carbon black concentration in that outer layer is 2.0–2.5 wt%, while the internal pressure sheath remains unfilled.
Production-scale extrusion of the pressure sheath is performed on single-screw extruders with grooved feed sections, screw diameters of 120–150 mm, L/D ratios of 30:1–36:1, and barrier-screw geometry with a compression ratio of 2.5:1–3.0:1. Melt temperature is maintained at 220–245°C; deviation below 215°C causes melt fracture at the die lips and poor surface definition, while temperatures above 250°C produce oxidative yellowing and gel particles that are detected as spark-test faults. Barrel cooling fans and temperature-controlled feed throats are required to limit shear heating to ±5°C of setpoint, and melt residence time should remain between 20 min and 35 min. Vacuum calibration is held at -0.2 to -0.6 bar, followed by multistage water cooling and ultrasonic wall-thickness measurement with a tolerance of ±0.10 to ±0.20 mm. Pre-drying at 80°C for 6–8 h to residual moisture below 0.08 wt% is mandatory when ambient relative humidity exceeds 60% because moisture above this threshold reduces molecular weight through hydrolysis and generates microbubbles in the formed sheath. Compliance is assessed under API 17J and ISO 13628-2 for unbonded flexible pipe, with sour-fluid chemical resistance according to ISO 23936-1 and long-term hydrostatic strength according to ISO 1167 and ISO 9080:2012. The finished part is an unbonded flexible riser or flowline for subsea production; published long-term data for service temperatures above 60°C in high-H2S fluids are limited, and project-specific qualification is mandatory.
| Qualification area | Standard/test method | Parameter in pressure sheath validation |
|---|---|---|
| Melt volume-flow stability | ISO 1133-1 | Batch conformity after heat history |
| Density | ISO 1183-1 | Mass balance verification |
| Tensile properties after fluid immersion | ISO 527-1/-2 | Yield stress and elongation at break |
| Long-term hydrostatic strength | ISO 9080:2012, ISO 1167 | Hoop stress versus time-to-failure |
| Chemical resistance in sour fluid | ISO 23936-1 | Property retention after exposure |
| Rapid gas decompression | API 17J qualification block | Post-decompression crack observation |
Reinforced thermoplastic pipe for onshore natural gas gathering and midstream distribution uses an extruded PA12 liner as the primary gas barrier, with wall thickness specified between 3.0 mm and 8.0 mm before the high-strength glass, aramid, or steel reinforcement winding is applied. The liner formulation is 100 wt% VESTAMID NRG 1001 without filler; any process-aid masterbatch is restricted to ≤0.5 wt% because low-molecular-weight additives can increase methane permeation and degrade rapid gas decompression resistance. The downstream production process starts with liner extrusion on a barrier-screw single-screw extruder at melt temperature 230–250°C, vacuum sizing, and haul-off; after cooling, the liner is wrapped with continuous reinforcement under controlled tension and then jacketed with an outer polyethylene layer. Qualification is conducted under API 15S for spoolable reinforced plastic line pipe, with pressure resistance verified by ISO 1167, long-term hydrostatic strength extrapolation by ISO 9080:2012, and gas permeability measured according to ISO 15105-1 when project specifications require barrier validation. The terminal product is a spoolable reinforced thermoplastic pipe for gas gathering and distribution, typically qualified for service pressures from 16 bar to 42 bar. Above 42 bar, published rapid gas decompression data for this PA12 grade are insufficient in the completed pipe structure, so full-scale qualification testing is required.
Process conflict in reinforced thermoplastic pipe liner manufacturing arises from the need to maintain a liner surface smooth enough for reinforcement adhesion while minimizing residual stress that contributes to rapid gas decompression cracking. If vacuum calibration pressure is more negative than -0.4 bar, the liner surface can develop microstress concentrations; if cooling water temperature is below 15°C, rapid skin solidification traps residual hoop stress. In production practice, cooling water is staged from 25°C to 40°C, and the vacuum tank is set at -0.1 to -0.3 bar for liner wall thicknesses above 5.0 mm. Batch-to-batch variation in moisture content between 0.08 wt% and 0.15 wt% has been associated with visible gel formation and reduced liner ductility during radial collapse tests. Melt pressure sensors and feedback-controlled screw speed are used to hold specific throughput within ±3% of target mass flow.
Across subsea umbilical outer sheath extrusion lines, VESTAMID NRG 1001 is blended with 4.0–6.0 wt% carbon black masterbatch in a PA12 carrier, yielding 2.0–2.5 wt% carbon black in the final sheath and 94.0–96.0 wt% base resin. Excessive masterbatch above 6.0 wt% reduces elongation at break and increases notch sensitivity during seabed laying, while poor carbon black dispersion creates conductive pathways that reduce spark-test performance. Sheath extrusion is performed on single-screw extruders with L/D 30:1–33:1, melt temperature 220–240°C, and vacuum calibration water at 20–40°C. The extruded sheath is applied over the assembled umbilical core, cooled in a multistage water bath, and inspected by spark testing and wall-thickness measurement. Compliance is evaluated under ISO 13628-5 and API 17E for subsea umbilicals, and material qualification in sour or high-temperature service follows NORSOK M-710 where specified. The terminal product is a subsea umbilical for hydraulic control, chemical injection, or electrical power distribution, with an outer sheath that resists marine weathering, hydrostatic collapse, and armor-layer abrasion. Field experience indicates that feedstock moisture above 0.10 wt% increases gel formation and spark-test rejects; therefore closed-loop hopper drying with dew point below -20°C is used when ambient relative humidity exceeds 60%. Operational boundaries also require limiting melt residence time to 30 min and avoiding melt temperatures above 245°C to prevent oxidative degradation of the carbon-black-containing layer.
Extruded PA12 inner liners for offshore chemical transfer hoses carrying methanol, hydraulic control fluids, and marine diesel are produced from 100 wt% VESTAMID NRG 1001; plasticizer is not added because low-molecular-weight additives migrate into hydrocarbon fluids and cause liner hardening over time. A process-aid masterbatch is permitted only at 0.3–0.6 wt% when melt fracture appears at high draw speeds, and each modified formulation is subjected to extraction testing in the intended service fluid according to ISO 23936-1. Liner production uses a single-screw extruder with crosshead die and mandrel-supported internal sizing; melt temperature is controlled at 225–245°C, and the gap and haul-off speed are adjusted to hold liner ovality within ±0.15 mm. The cooled liner is then plied with reinforcement and an outer elastomer or polymer cover to complete the hose assembly. Standards applicable to the finished assembly include API 17E and ISO 13628-5 where the hose is installed as part of a subsea chemical distribution system, with hydrostatic proof testing according to ISO 1402. The terminal product is a flexible offshore chemical transfer hose with an extruded PA12 inner liner, designed for working pressures up to 100 bar and temperatures up to 60°C, subject to qualification. Published data for continuous methanol exposure above 60°C are limited; compatibility testing at service temperature is mandatory before design freeze.
In production-scale runs on single-screw extruders with 60–90 mm screw diameter and crosshead dies, melt temperature fluctuation above ±5°C at the die produces inner surface roughness that is detected before reinforcement plying by bore surface profilometry. The liner is dried to residual moisture below 0.08 wt% in closed-loop desiccant systems with hopper dew point below -20°C; moisture above this limit creates microbubbles at the melt front and lowers hydrostatic burst pressure in finished hose assemblies. Inner surface defects act as crack-initiation points during repeated flexing, and hydrostatic burst testing according to ISO 1402 is performed on every production lot before hose assembly release.
When crosslinked polyethylene does not meet methane permeation or sour-fluid resistance requirements in bonded flexible pipe, VESTAMID NRG 1001 is extrusion-formed as the inner liner with a design thickness of 3.0–8.0 mm, representing 20–35% of the total pipe wall cross-section depending on the steel and textile reinforcement schedule. The liner is processed from 100 wt% neat resin; no peroxide crosslinking agent is added to the PA12 layer because residual peroxide migration from adjacent elastomer plies during autoclave vulcanization can cause oxidative chain scission in the polyamide at cure temperatures above 160°C. The production sequence includes PA12 liner extrusion, surface activation and adhesion-promoting film application, wrapping of textile and steel reinforcement plies, and autoclave vulcanization to form the bonded structure. Qualification is performed under API 17K for bonded flexible pipe, with tensile properties tested according to ISO 527-1/-2, long-term hydrostatic strength according to ISO 9080:2012, and chemical compatibility according to ISO 23936-1. The terminal product is a bonded flexible pipe for offshore gas lift, gas injection, or fluid transfer where liner and reinforcement must remain mechanically coupled. Operational boundaries include avoiding continuous contact with concentrated primary amines at temperatures above 50°C and avoiding pH below 2.0 unless qualified, because PA12 is susceptible to acid-catalyzed hydrolysis under those conditions. Published data for bonded flexible pipe with PA12 liners above 70°C in wet sour gas are limited, and full-scale qualification is required for such service.
The main conversion conflict is that the PA12 liner must retain enough surface functionality for adhesion to nitrile or hydrogenated nitrile elastomer layers without oxidatively degrading during autoclave cure. Adhesion promoters based on silane or urethane chemistry are applied at a grammage of 2.0–5.0 g/m², and liner surface treatment must produce a dyne level above 42 mN/m before plying. Autoclave cycles are controlled with heating rates below 2.5°C/min above 140°C to avoid localized overheating at the PA12-elastomer interface. Heating rates exceeding 3.0°C/min have been associated with interfacial voids and reduced peel strength; therefore the cure curve is verified by thermocouple measurements inside the pipe wall.
Solid-wall PA12 pipe for high-pressure gas distribution networks is extruded from VESTAMID NRG 1001 in standard dimension ratios from SDR 7.5 to SDR 17, with wall thicknesses between 3.0 mm and 20.0 mm depending on operating pressure class. The pipe formulation consists of 95.0–97.0 wt% base resin and 3.0–5.0 wt% carbon black masterbatch, yielding 2.0–2.5 wt% carbon black in the finished wall for process stability and weathering resistance during above-ground storage. Extrusion is performed on single-screw machines with L/D 30:1–36:1, melt temperature 220–250°C, and vacuum calibration; for wall thicknesses above 15.0 mm, internal mandrel cooling is used to prevent melt collapse and centerline porosity. Pressure design is verified by long-term hydrostatic testing under ISO 9080:2012 and ISO 1167, and installed industrial piping systems are qualified under ISO 15494 with national gas distribution codes applied where required. The terminal product is a solid-wall PA12 gas distribution pipe for urban and industrial high-pressure gas networks, joined by electrofusion or butt fusion using PA12-compatible fittings; typical design pressures for such pipe systems are 10–16 bar. Pre-drying to residual moisture below 0.08 wt% is mandatory before extrusion, and melt residence time should not exceed 35 min to prevent gel specks and loss of elongation at break. For utility projects requiring long-term gas permeation values, permeability testing according to ISO 15105-1 is recommended on pipe wall samples to verify batch consistency.
In thick-wall pipe extrusion, the controlling defect is centerline porosity caused by differential shrinkage between the rapidly quenched outer skin and the slowly cooled inner wall. Production lines use internal mandrel cooling and calibrated vacuum sizing to maintain a radial cooling rate below 5°C/s for wall thicknesses above 15.0 mm; faster cooling at the outermost surface creates a stiff skin that resists further calibration. Batch-to-batch melt pressure variation at the die of more than ±0.5 MPa indicates poor melt homogeneity and correlates with pipe dimensional instability. These process variables are recorded on each production order and audited against the specified tolerance before pipe sections are released for electrofusion joining.
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Evonik VESTAMID® NRG 1001 PA 12 is a high-viscosity, plasticizer-modified polyamide 12 extrusion compound supplied in granular form for hydrocarbon containment in flexible pipe and subsea production systems. Manufacturer-published typical values include a density of 1.01 g/cm³ (ISO 1183-1), a tensile modulus of 350 MPa (ISO 527-1/-2), a yield stress of 20 MPa, and a nominal strain at break exceeding 200 %. Shore D hardness is reported as 57 (ISO 868), while Vicat softening temperature VST/B50 is 140 °C (ISO 306). Melt temperature by differential scanning calorimetry is 176 °C (ISO 11357-3). The melt volume-flow rate is specified as a high-viscosity value, typically below 10 cm³/10 min at 190 °C/21.6 kg (ISO 1133-1). Compared with VESTAMID® L2140, a general-purpose PA 12, the NRG 1001 grade has a lower tensile modulus and higher melt viscosity, which supports thick-wall tube extrusion and low-temperature flexibility. The natural-colour designation distinguishes it from the carbon-black-filled VESTAMID® NRG 2101 variant used where UV stabilization is required.
In unbonded flexible pipe construction, VESTAMID® NRG 1001 is processed as the extruded pressure sheath or inner liner, where the polymer must tolerate continuous contact with produced hydrocarbons, carbon dioxide, hydrogen sulfide, and produced water at elevated pressure. Specification is commonly made against API Spec 17J and ISO 13628-2; long-term hydrostatic strength is assessed under ISO 9080. The plasticized PA 12 matrix retains low-temperature impact resistance and has lower water absorption than PA 6 or PA 66, reducing dimensional change in wet service. Gas permeation, particularly CO₂ and CH₄, controls wall thickness; for high-pressure gas service, published data for specific gas mixtures and decompression profiles is limited, and qualification under operator-specific protocols or API RP 17B is required.
Extrusion of VESTAMID® NRG 1001 requires pre-drying in a desiccant-hot-air dryer at 80 °C for 4–12 h to achieve residual moisture below 0.1 %. Moisture above 0.15 % reduces melt viscosity through hydrolytic chain scission and produces splay, internal porosity, or surface roughness on the pipe wall. Barrel temperature profiles are normally set from 190 °C in the feed zone to 230 °C in the metering zone, with die head temperature controlled between 210 °C and 240 °C. Residence time above 260 °C should be avoided because thermo-oxidative degradation generates gel particles and lowers melt strength. Single-screw extruders with an L/D ratio of at least 24:1 and a three-zone screw having compression ratios between 2.5:1 and 3.0:1 provide sufficient melting homogeneity for thick-walled tube. Grooved-feed extruders increase throughput but can generate melt-temperature heterogeneity; production lines therefore monitor melt pressure at the breaker plate and keep pressure drop below 30 MPa to limit shear heating. Pipe sizing uses vacuum calibration tanks; cooling water below 20 °C is typical for dimensionally stable PA 12 tube.
On production-scale single-screw lines, the practical output ceiling for large-diameter PA 12 pressure sheaths is not plastication-limited but cooling-limited. As screw speed increases, melt temperature rises steeply because viscous dissipation dominates over barrel heat removal. The resulting melt-temperature overshoot can exceed 260 °C even when barrel setpoints remain unchanged. Operators therefore limit screw speed and use low-shear barrier screws to keep melt temperature at the die entrance below 250 °C. Batch-to-batch viscosity variation in high-viscosity PA 12 can shift die pressure by 5–10 %; extrusion lines compensate through screw speed adjustment and die gap temperature trimming. For a 10 mm wall thickness, melt-temperature fluctuation of ±5 °C at the die has been observed to produce wall-thickness variation exceeding ±0.2 mm, which creates non-uniform hoop stress in the finished pressure sheath.
The high-viscosity melt exhibits pronounced shear thinning. Apparent viscosity at 230 °C and a wall shear rate of 100 s⁻¹ is typically in the range of 800–1,200 Pa·s for high-viscosity PA 12 pipe grades. The power-law index is below 0.6, meaning that throughput increases yield less than proportional pressure rise. This shear-thinning response can mask melt-temperature rise because viscous dissipation remains concentrated near the screw root and die land. Extruder lines use ultrasonic wall-thickness sensors and thermal cameras at the vacuum calibration exit to detect eccentricity; closed-loop control adjusts die centering bolts. A drift of ±1 °C in cooling water temperature can create asymmetric crystallization and residual stress, which is detectable as pipe curvature.
The controlled plasticizer content in NRG 1001 reduces tensile modulus and hardness relative to unplasticized PA 12 while improving low-temperature flexibility. Table 1 compares manufacturer-published typical values for NRG 1001, unplasticized PA 12, and PE 100. The unplasticized PA 12 modulus of approximately 1,400 MPa and Shore D hardness near 70 provide high hoop stiffness but lower strain tolerance in dynamic riser bending. NRG 1001 at 350 MPa modulus is selected when the pressure sheath must survive repeated flexing and low-temperature installation. The trade-off is higher permeation and lower maximum continuous service temperature than some rigid PA 12 grades, although the NRG 1001 grade remains above polyethylene in temperature resistance.
| Property | VESTAMID® NRG 1001 | Unplasticized PA 12 | PE 100 |
|---|---|---|---|
| Density (ISO 1183-1) | 1.01 g/cm³ | 1.01 g/cm³ | 0.95 g/cm³ |
| Tensile modulus (ISO 527-1/-2) | 350 MPa | 1,400 MPa | 1,000 MPa |
| Shore D hardness (ISO 868) | 57 | 70 | 60 |
| Vicat B50 (ISO 306) | 140 °C | 140 °C | 75 °C |
| Moisture saturation (ISO 62) | 0.7 % | 0.7 % | <0.01 % |
Compared with polyamide 11, PA 12 contains a longer aliphatic chain between amide groups, which gives a lower equilibrium moisture uptake and a slightly lower melting point. This distinction is relevant in wet hydrocarbon service because absorbed water plasticizes the amorphous phase and reduces glass transition. Compared with PA 6 or PA 66, PA 12 absorbs less than one-third of the water of PA 6, reducing hydrolysis risk and dimensional drift. However, the same amide chemistry means that strong mineral acids and oxidizing agents remain incompatible. In a typical unbonded flexible pipe line, the PA 12 sheath is extruded over a steel carcass with a wall thickness between 3 mm and 12 mm depending on design pressure and bore diameter. Downstream armoring applies tensile wires and external sheaths; the PA 12 layer must withstand spooling strain at minimum bending radius. Qualification therefore includes tensile creep tests under ISO 899-1 and slow crack growth evaluations according to pipe-specific methods. Low-temperature bending tests at −30 °C are used to confirm that the plasticized grade does not craze during reeling installation.
On thick-wall tube lines, the most frequent production defects are sink marks at the mandrel exit, melt fracture on the inner wall, and axial ovality caused by non-uniform cooling. These defects are controlled by maintaining die land length and adjusting vacuum calibration pressure; excessive vacuum can collapse the soft PA 12 parison. Regrind levels above 20 % lower melt homogeneity and increase gel counts; closed-loop gravimetric feeding of virgin and regrind streams is used to maintain lot traceability.
In sour gas and multiphase hydrocarbon service, the design of the PA 12 liner or pressure sheath is controlled less by tensile yield than by diffusive gas uptake and rapid gas decompression resistance. Qualification programs under NORSOK M-710 or ISO 23936-1 evaluate property retention after aging in H₂S-containing hydrocarbon phases. VESTAMID® NRG 1001 is generally resistant to aliphatic hydrocarbons and aromatic-free crude fractions, but strong acids, polar solvents, and high-concentration zinc bromide brines can plasticize or hydrolytically degrade the polyamide matrix. The maximum permissible H₂S partial pressure and temperature combination is not a single fixed value; it depends on liner thickness, depressurization rate, and water cut. Published data for this specific configuration is limited outside the manufacturer’s chemical resistance tables and operator qualification programs. The plasticizer modification in NRG 1001 increases gas permeability relative to unplasticized PA 12; therefore liner thickness calculations based on permeation coefficients from unplasticized grades are not conservative for this product.
Permeation coefficients for CO₂ and CH₄ in plasticized PA 12 are higher than in PVDF but lower than in HDPE. The diffusion-limited flow of gas through the liner can cause blistering after rapid decompression if the gas concentration exceeds the critical saturation limit. The NORSOK M-710 rapid gas decompression test cycles pressure from high-pressure saturation to atmospheric within a specified time; samples are inspected for cracks and blisters. Published data for this specific configuration is limited for VESTAMID® NRG 1001 because results depend on test gas composition, saturation time, and depressurization rate.
The material is typically assessed against a compliance matrix that includes density and mechanical data from ISO 1183-1 and ISO 527-1/-2, long-term hydrostatic strength from ISO 9080, and service-specific requirements from API Spec 17J, API RP 17B, and ISO 13628-2. Regulatory documentation under REACH and RoHS is supplied by the manufacturer, with the polymer component generally exempt from REACH registration but subject to monomer and additive obligations. The table below summarizes the principal test standards and their scope.
| Standard | Scope | Typical reported value |
|---|---|---|
| ISO 1183-1 | Density | 1.01 g/cm³ |
| ISO 527-1/-2 | Tensile modulus / yield stress | 350 MPa / 20 MPa |
| ISO 1133-1 | Melt volume-flow rate | High-viscosity value, below 10 cm³/10 min |
| ISO 11357-3 | Melting temperature | 176 °C |
| ISO 306 | Vicat VST/B50 | 140 °C |
| ISO 868 | Shore D hardness | 57 |
| ISO 9080 | Long-term hydrostatic strength | Service-specific |
| API Spec 17J | Unbonded flexible pipe | Qualification required |
| NORSOK M-710 | Sour service non-metallics | Qualification required |
Storage and handling of granulate must be controlled because PA 12 absorbs atmospheric moisture. Open containers in high-humidity environments above 60 % relative humidity absorb surface moisture within hours; reprocessed regrind levels above 20 % can create viscosity heterogeneity in thick-wall pipe. The material should not be exposed to strong aqueous acids at high temperature or to zinc bromide completion brines without qualification, because plasticizer extraction and hydrolysis can shift mechanical response. Contact with certain chlorinated hydrocarbons can cause swelling; their use as cleaning solvents on extruder components should be avoided.
