| HS Code | 983841 |
| Density | 1.01 g/cm³ |
| Melting Point | 178 °C |
| Water Absorption 24h | 0.2% |
| Tensile Modulus Dry | 250 MPa |
| Tensile Strength Dry | 30 MPa |
| Elongation At Break Dry | >200% |
| Flexural Modulus Dry | 250 MPa |
| Charpy Impact Strength 23 C Dry | No break |
| Charpy Notched Impact Strength 23 C Dry | 90 kJ/m² |
| Shore D Hardness Dry | 60 |
| Hdt At 0 45 Mpa Dry | 50 °C |
| Vicat Softening Temperature Dry | 150 °C |
As an accredited Evonik Vestamid X7325 nf (dry properties) Nylon 12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Evonik Vestamid X7325 NF Nylon 12 is supplied in 25 kg sealed, moisture-protective bags, ensuring dry, ready-to-process granules. |
| Container Loading (20′ FCL) | 20′ FCL: dry Nylon 12 granules palletized and secured in sealed container, stable, non-hazardous, ready for safe transport. |
| Shipping | Evonik Vestamid X7325 NF Nylon 12 ships as a non-hazardous granular polymer in sealed, moisture-proof packaging. Transport in clean, dry containers or trucks to prevent contamination and moisture absorption. Avoid extreme heat and direct contact with incompatible materials. Standard freight handling applies; no special dangerous goods declarations required. |
| Storage | Store Evonik Vestamid X7325 NF (Nylon 12) in its original, unopened packaging in a cool, dry, well-ventilated area. Protect from moisture and direct sunlight, and keep away from heat sources and ignition hazards. Maintain moderate temperatures to prevent degradation or dampness, ensuring material stays dry before processing. |
| Shelf Life | Store in original sealed packaging in a cool, dry place. Recommended shelf life is at least 2 years from date of delivery. |
In heavy-duty truck and trailer compressed-air circuits, VESTAMID X7325 nf (dry properties) is extruded into flexible monowall and multi-layer tubing for brake actuation lines, suspension levelling valves, and trailer coupling control lines. The grade is processed as supplied after forced-air desiccant drying to <0.10% moisture; typical drying is 80 °C for 4–6 h at a dew point of -30 °C or lower. In formulation ratio terms, the polymer fraction is maintained at 98.0–99.0 wt%, while UV-stabilised carbon black masterbatch is metered at 1.0–2.0 wt%; when a coextruded identification stripe is required, the stripe occupies ≤5% of the finished wall cross-section and does not displace the base PA12 matrix. Compounding is avoided; direct extrusion is performed on single-screw extruders with L/D 24:1–30:1, barrier screw compression ratios of 2.5:1–3.5:1, and melt temperature held at 215–235 °C. Downstream, vacuum calibration at 35–45 °C water and 0.1–0.3 bar vacuum stabilise outer diameter before haul-off and coiling; finished wall thickness is typically 1.0–2.5 mm for outside diameters from 6 mm to 16 mm. The resulting parts are used as straight lengths and coils for push-to-connect air brake fittings, spring-brake supply lines, and trailer service lines. Compliance anchors to SAE J844, ISO 7628-1, DIN 74324-1, and FMVSS 106; burst-pressure and cold-impact tests are performed according to the corresponding clauses, while production QC includes dimensional checks against SAE J844 wall-thickness tolerances. Residual moisture above 0.15% remains the dominant cause of bubble-shaped surface defects and intermittent collapse during vacuum sizing, so hopper residence time must be adjusted when ambient relative humidity exceeds 60%.
Fuel line architecture below SAE J2260 permeation limits couples VESTAMID X7325 nf as the outer protective layer with EVOH and conductive PA12 layers. The wall-thickness distribution is set by layer ratio rather than bulk addition: outer PA12 occupies 48–58% of wall thickness, tie layers 6–10% each, EVOH 3–5%, and conductive inner PA12 22–30%; the X7325 nf layer itself is diluted with no more than 2 wt% conductive or UV masterbatch. Processing is carried out on five-layer coextrusion lines with spiral mandrel dies, gravimetric layer proportioning, and melt pumps on each extruder; PA12 melt temperature is set at 210–230 °C, while EVOH melt is retained at 205–225 °C to avoid barrier degradation. Post-extrusion vacuum calibration and cooling are followed by stress-relief because residual hoop stress in shipped straight lengths can otherwise produce cut-end ovality and fitting leakage. The terminal parts include fuel feed lines, vapour return lines, and fuel tank vent lines. Compliance testing is performed under SAE J2260, ISO 13775-1, and DIN 73378-1, with permeation measured over 60 days at 40 °C using CE 10 or FAM B reference test fuels; low-temperature impact resistance is evaluated after conditioning at -40 °C. A specific operational boundary applies to plasticised PA12 outer layers: continuous underbody temperatures above 115 °C can deplete antioxidants and alter plasticiser migration kinetics, thereby weakening adhesion to tie layers over the vehicle duty cycle.
For dynamic riser and subsea control umbilical installations, small-bore PA12 conduits are used for hydraulic pilot lines, methanol injection, and scale-inhibitor delivery from platform to subsea trees and manifolds. In this segment the extrusion stock is processed neat, typically at 100 wt% VESTAMID X7325 nf, with separately dried carbon black masterbatch added only when UV exposure during topside handling is specified at 2.0–2.5 wt%. The production line is configured as a single-screw extruder with grooved feed section, L/D 30:1, melt gear pump, and laser diameter gauge; wall-thickness control is held to ±0.05 mm for tube diameters between 6.3 mm and 25.4 mm. Melt temperature is kept in the 220–250 °C range to achieve the required burst pressure and to minimise melt fracture at higher line speeds. Because subsea service life requirements routinely extend to 20 years, acceptance criteria reference API 17E, ISO 13628-5, and API 17J; hydrostatic collapse and rapid gas decompression resistance are assessed using the applicable clauses rather than generic tube standards. The terminal product types are coiled hydraulic control lines, chemical injection tubes, and methanol service conduits. Steel tube manufacturing tolerances do not transfer directly to thermoplastic extrusion, so continuous ultrasonic wall measurement or laser eccentricity monitoring is required; published data for this specific grade in full-scale dynamic riser fatigue testing is limited, and qualification programmes therefore rely on operator-documented ageing under representative annulus fluids.
In automotive and rail rolling-stock harness manufacture, VESTAMID X7325 nf is extruded as a thin-wall jacket over twisted conductor bundles or as a secondary protective sheath over XLPE insulation. The jacket compound is metered at 97.0–98.0 wt% base resin with 2.0–3.0 wt% UV/heat-stabilised masterbatch, and the melt is applied at 205–225 °C through a pressure-extrusion crosshead with flow-channel compression ratio not exceeding 1.5:1 to prevent conductor insulation deformation. Vacuum calibration is omitted; cooling is performed in a water trough at 25–40 °C because the jacket must shrink only minimally onto the core and must retain concentricity over long cable lengths. Terminal products include underhood sensor cable sheaths, railway axle-counter cable jackets, and heavy-equipment harness outer covers. Compliance for flammability and chemical resistance is evaluated under IEC 60332-1-2, EN 50264-1, and SAE J1128 for low-tension vehicle cable; tensile and elongation after thermal ageing are tested per ISO 527-2 and ISO 188. Material documentation for electrical and electronic cable applications additionally references REACH SVHC statements and RoHS Directive 2011/65/EU. Volume swell after ISO 1817 immersion in diesel can exceed 2%, so hydrocarbon-contaminated cores should be cleaned before jacketing to avoid post-extrusion surface micro-crazing and jacket loosening along the cable axis.
When workshop compressed-air networks terminate in push-to-connect aluminium fittings, tube stock must exhibit consistent ovality and a hard, smooth inner surface to prevent leakage at low assembly torque. VESTAMID X7325 nf is formulated with 1.0–2.0 wt% colour masterbatch and extruded in outside diameters from 4 mm to 16 mm; the polymer feed is maintained at 99.0 wt% before masterbatch dilution. Production employs vacuum sizing with a closed-loop diameter gauge that adjusts haul-off speed within ±0.5%, and melt temperature is held at 210–240 °C. The resulting tubes are used as workshop airline, valve actuation tubing, and robotic pneumatic control lines. The applicable performance envelope is defined by ISO 5774 and ISO 161-1 for outer diameter and wall thickness; sustained pressure ratings are normally 10–16 bar at 23 °C with a safety factor applied by the fitting manufacturer. Because plasticised PA12 has lower burst strength than unplasticised PA12, wall thickness should be increased when operating at 60 °C elevated shop air temperatures or when trace mineral-oil mist is present in the air stream.
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Evonik Vestamid X7325 nf is a polyamide 12 extrusion resin based on laurolactam. For the purpose of this document, “dry properties” means mechanical and thermal values obtained after drying to a residual moisture content below 0.1% by weight and tested before intentional moisture conditioning. These values are commonly cited for dry-moulded or dry-extruded articles, but they do not represent equilibrium properties after atmospheric moisture uptake. Because published grade-specific data for this configuration is limited, generic unfilled polyamide 12 values are referenced with their test methods. The nf designation identifies a natural, non-pigmented pellet state, not a reinforcement or filler class.
Polyamide 12 has a long aliphatic methylene sequence between amide linkages, containing 11 methylene units per repeat unit. This structure reduces the number of hydrogen-bonding sites relative to PA6 or PA66 and produces a density near 1.01 g/cm³ to 1.02 g/cm³ under ISO 1183-1:2019. The melting peak by ISO 11357-3:2018 is ordinarily 176 °C to 180 °C for unfilled PA12, and the dry glass transition temperature is generally reported near 40 °C to 50 °C by ISO 11357-2:2020. The low amide density is the principal structural reason for low water absorption, dimensional stability in humid service, and stable dry-to-conditioned property retention compared with PA6 and PA66.
Dry tensile and flexural data for unfilled polyamide 12 must be interpreted as resistance to short-term deformation in low-moisture assemblies, not as long-term service values in high-humidity environments. Under ISO 527-2:2012 at 23 °C, an unfilled PA12 extrusion grade in the dry state typically shows a tensile modulus of 1400 MPa to 1600 MPa; after conditioning to equilibrium at 50% relative humidity, the modulus can fall to 900 MPa to 1100 MPa. Tensile stress at yield in the dry state is commonly 40 MPa to 50 MPa, while conditioned yield stress may decline by 15% to 25%. Elongation at break for unreinforced PA12 can exceed 200%, although the exact value depends on extrusion draw ratio, test speed, and moisture content.
Where impact resistance is used for material selection, dry notched Charpy values according to ISO 179-1/1eA are frequently in the range 5 kJ/m² to 7 kJ/m², whereas conditioned specimens may show much higher notched impact values because absorbed water plasticizes the amorphous phase. This wide dry-to-conditioned difference is a characteristic of polyamide 12; it is not a defect. It requires design calculations to specify whether the component will operate in a dry interior or a humid underbody location. Dimensional changes at equilibrium are lower than for PA66 because saturated water uptake is only 1.5% to 1.7% by mass under ISO 62:2008; PA66 can reach 8.5% to 9.0%. Linear swelling of PA12 in high-moisture service is often below 0.3%, while PA66 may exceed 1.2% under similar conditions.
In extrusion of unfilled PA12 tube stock, pellet drying is performed in a dehumidified-air dryer at 80 °C for 4 h to 6 h to reach the 0.1% moisture threshold. Dried granules exposed to open hopper air above 60% relative humidity can reabsorb surface moisture within 30 min, producing micro-porosity in the melt and a deterioration in inner-tube wall smoothness. A single-screw extruder with an L/D ratio of 25:1 to 30:1, a three-zone screw, and a compression ratio between 2.0:1 and 2.5:1 is standard for such natural PA12 feedstock. Barrel temperatures are commonly ramped from 220 °C near the feed throat to 250 °C at the metering zone, with die-head temperature maintained at 225 °C to 240 °C. On production lines with corrugator dies or cross-head cable sheathing tooling, melt-pressure variation below 5% of setpoint is required to maintain wall-thickness uniformity; screen packs of 100 to 200 mesh are typically placed ahead of the breaker plate for melt polish.
Injection moulding of unfilled PA12 is run at melt temperatures of 230 °C to 270 °C and mould temperatures of 40 °C to 80 °C. Holding pressure is usually 40 MPa to 80 MPa, with packing time determined by gate freeze rather than a fixed long hold. Moulders who process at clamp force settings above 600 kN for multi-cavity tools observe that hot-runner residence time rather than cavity fill speed is the main cause of colour shifts in natural PA12. If regrind is used, a fraction of 10% to 15% is typically tolerated on tubing lines, but regrind above 20% can reduce notched impact and increase melt-flow variation.
Thermal stability boundaries are more restrictive in natural polyamide 12 than in heat-stabilized black grades. Melt temperatures above 260 °C should be avoided in continuous production, and excursions to 280 °C should not exceed 10 min because chain scission, lactam reformation, and oxidative yellowing can occur. A rise in melt volume-flow rate under ISO 1133-1:2022 beyond the supplier’s specification is a practical indicator of thermal degradation. Where hot runners are used, residence time at 250 °C should remain below 20 min unless the specific grade is compounded with an antioxidant. Processors who observe surface splay, silver streaks, or a sudden decrease in melt pressure at constant screw speed should first check moisture, then residence time, and finally the thermocouple accuracy of the rear barrel zones.
Natural unfilled PA12 is incompatible with strong mineral acids and phenol-rich chemical streams, and it can stress-crack in the presence of methanol or ethanol under sustained load at elevated temperature. It is not appropriate to infer food-contact or medical-grade compliance solely from the use of a natural PA12 base resin. Regulatory conformity must be verified against EU 10/2011, FDA 21 CFR 177.1500, REACH 1907/2006/EC, and RoHS 2011/65/EU for the exact compound and conversion process.
Automotive air-brake tubing extruded from unfilled PA12 is commonly assessed against SAE J844 for low-temperature impact, burst pressure, and resistance to zinc chloride conditioning. Where PA12 is used for fuel-vapour lines, qualification often follows SAE J2260 or an equivalent OEM specification; permeation resistance in such systems is controlled primarily by the crystalline lamellar structure, not by fluoropolymer barrier layers alone. Cable jacketing in thin walls below 0.5 mm is another application area for unreinforced PA12 extrusion, particularly where crosshead tooling and high line speed require stable melt viscosity. The dry-state low moisture absorption of 0.5% to 0.8% at 23 °C and 50% relative humidity preserves dimensional stability in damp compartments better than PA66, but continuous exposure to strong acid vapours or hot chlorinated solvents should be avoided.
In pneumatic tubing, pressure retention at -40 °C is a typical qualification requirement, and PA12’s low-temperature impact behaviour is one of the reasons it replaces PA66 in such applications. In cable sheathing, the material is processed over copper or aluminium conductors; the low water absorption reduces the risk of hydrolytic degradation of adhesion promoters in humid ageing tests such as ISO 6722-1:2011 or OEM ageing protocols. However, published data for this specific Vestamid grade in every application configuration is limited, and part-specific validation remains required.
The property profile of Vestamid X7325 nf differs from PA11, PA66, and glass-fibre reinforced PA12 primarily because of the amide-group spacing and the absence of stiff inorganic reinforcement. The following baseline table summarises unfilled dry-state values for PA12, PA11, and PA66; the columns are generic polymer family values, not guaranteed values for X7325 nf.
| Attribute | Unfilled PA12 dry baseline | PA11 dry baseline | Unfilled PA66 dry baseline | Test method |
|---|---|---|---|---|
| Density | 1.01–1.02 g/cm³ | 1.03–1.05 g/cm³ | 1.13–1.15 g/cm³ | ISO 1183-1:2019 |
| Melting peak | 176–180 °C | 187–192 °C | 260–265 °C | ISO 11357-3:2018 |
| Tensile modulus dry | 1400–1600 MPa | 1100–1300 MPa | 3000–3300 MPa | ISO 527-2:2012 |
| Water absorption at saturation | 1.5–1.7% | 1.6–1.9% | 8.5–9.0% | ISO 62:2008 |
| Notched Charpy impact dry | 5–7 kJ/m² | 8–12 kJ/m² | 3–5 kJ/m² | ISO 179-1/1eA |
Compared with PA66, Vestamid X7325 nf relies on a longer aliphatic chain between amide groups, which reduces hydrogen-bonding density. The practical consequence is lower dry tensile modulus and strength but much lower water absorption and better retention of elongation after moisture conditioning. Compared with PA11, the nylon 12 structure has an additional methylene unit per repeat and a slightly lower melting peak; PA11 may show a modestly higher dry notched impact value in some formulations, but both families are used in flexible or semi-rigid tubing. Compared with glass-fibre reinforced PA12, the neat grade has lower tensile modulus and lower creep resistance; a 30% glass-filled PA12 compound can exhibit dry tensile modulus from 4000 MPa to 6000 MPa, whereas the unfilled grade remains below 1600 MPa. The unfilled grade is therefore selected when cold impact, elongation, or low-density packaging requirements dominate over short-term stiffness.
For tooling conversion from PA66 to PA12, barrel temperatures should be reduced by 60 °C to 80 °C, and screw recovery settings re-validated because PA12 has a lower melt viscosity but a different freeze-off behaviour in the mould. Nozzle and hot-tip temperatures set above 260 °C from an existing PA66 process are generally too high for natural PA12. When converting from PA11, the melting-temperature difference is much smaller, but melt pressure during extrusion may require die-lip adjustment because the two materials differ in elongational viscosity at high draw rates.
At a quality-control level, incoming Vestamid X7325 nf lots can be checked for residual moisture, density, and melt volume-flow rate before production release. A second table lists typical checkpoints for a dry-type natural PA12 feedstock; the target values are control windows, not a substitute for the grade datasheet.
| Checkpoint | Typical control range for dry natural PA12 | Reference method |
|---|---|---|
| Residual moisture after drying | <0.1% | ISO 15512:2019 |
| Melt temperature in tube extrusion | 220–250 °C | Infrared pyrometer |
| Melt volume-flow rate | Supplier nominal ±10% | ISO 1133-1:2022 |
| Density | 1.01–1.02 g/cm³ | ISO 1183-1:2019 |
| Notched Charpy impact dry | 5–7 kJ/m² | ISO 179-1/1eA |
Batch-to-batch variance in melt volume-flow rate should be monitored because a shift greater than 15% from the supplier nominal can alter extrusion pressure and wall-thickness control, even when the material is still within moisture specification. For tubing lines running at 30 m/min to 60 m/min, a melt-pressure fluctuation above 5% is often sufficient to produce out-of-tolerance inner diameter at the cut-off point. The combination of in-line moisture control, melt-pump pressure stability, and validated regrind ratio is therefore more decisive than any single dry tensile value for stable production.
