| HS Code | 710725 |
| Density 23 C | 1.01 g/cm³ |
| Melt Volume Rate 190 C 5 Kg | 190 cm³/10 min |
| Melting Temperature Dsc | 178 °C |
| Glass Transition Temperature | 50 °C |
| Tensile Modulus Dry | 1400 MPa |
| Tensile Yield Stress Dry | 45 MPa |
| Nominal Strain At Break Dry | >200% |
| Charpy Notched Impact Strength 23 C Dry | 6 kJ/m² |
| Shore D Hardness Dry | 70 |
| Vicat Softening Temperature B 50 | 140 °C |
| Wasser Absorption 24 H | 0.2% |
| Water Absorption Saturation | 1.2% |
As an accredited Evonik Vestamid L1801 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 L1801 nf Nylon 12 is supplied in 25 kg moisture-proof, polyethylene-lined paper bags to preserve dry properties. |
| Container Loading (20′ FCL) | 20′ FCL loading of Evonik Vestamid L1801 nf Nylon 12: dry powder in bags on pallets, secured, ventilated, moisture-protected. |
| Shipping | Evonik Vestamid L1801 nf Nylon 12 is a dry, low-moisture polyamide resin supplied as pellets. Ship in sealed, moisture-barrier bags or drums to prevent water absorption. Store in a cool, dry area away from heat and humidity. Non-hazardous per transport regulations, but avoid dust accumulation. |
| Storage | Store Vestamid L1801 NF in its original, sealed container in a cool, dry, well-ventilated area away from direct sunlight and heat sources. Protect from moisture and humidity, as Nylon 12 absorbs water. Maintain room temperature and avoid prolonged storage under damp conditions to preserve dry properties and processing performance. |
| Shelf Life | Shelf life is typically 2 years from manufacture when stored unopened, dry, and cool in original packaging. |
Multi-layer fuel vapour return lines for gasoline and E10/E85 blended fuels rely on Vestamid L1801 nf dry natural PA12 as an outer jacket layer in a 5-layer construction comprising an EVOH barrier core and maleic anhydride-grafted tie layers. The outer PA12 layer is specified within a wall-thickness band of 0.15 mm to 0.30 mm depending on nominal outside diameter, while the inner PA12 layer is held below 0.20 mm in designs targeting fuel permeation below 15 g·m⁻²·day⁻¹ at 40 °C under SAE J1737. A production dry-blend for the outer layer uses 100 parts by mass Vestamid L1801 nf, 0.5–1.5 parts by mass hindered phenol/phosphite stabiliser masterbatch, and 1.0–2.5 parts by mass carbon black masterbatch where UV resistance is required. External plasticiser is omitted because plasticiser migration increases hydrocarbon permeation and lowers interlayer adhesion after heat ageing. The coextrusion run is executed on a 30:1 L/D single-screw extruder with a barrier screw and melt pump operating at 225 °C to 245 °C; the EVOH core remains below 220 °C, and the tie layer is held at 200 °C to 230 °C. Layer-thickness non-uniformity above ±0.03 mm in the EVOH core produces measurable barrier drop-off; on production lines this is detected by the ultrasonic wall scanner before vacuum calibration, but die-gap correction is made only after confirming melt-phase viscosity stabilisation. Field data from production-scale barrier screw extrusion shows melt-pressure fluctuation exceeding ±0.5 MPa whenever residual moisture exceeds 0.10 %, producing ovality and outside-diameter variation above ±0.05 mm. Downstream, vacuum calibration is followed by ultrasonic wall measurement and low-temperature impact testing at −40 °C per SAE J844. The terminal products are formed fuel vapour management lines for gasoline direct-injection and hybrid evaporative emissions systems, including quick connectors overmoulded with short-glass PA12 grades.
| Standard / specification | Application-specific parameter | Acceptance framework |
|---|---|---|
| SAE J1737 | Hydrocarbon permeation and coupling retention after thermal ageing | OEM numeric permeation limit at 40 °C; no coupling pull-off below design force |
| SAE J2260 | Fuel system electrostatic discharge | Surface-resistance target applies where dissipative layer is specified |
| SAE J844 | Low-temperature impact and burst strength | No cracking at −40 °C; burst pressure above service-rated minimum |
| ISO 527-2 | Tensile properties of extruded jacket strips | Tensile modulus and yield stress after conditioning at 23 °C and 50 % RH |
| ISO 1133-1:2022 | Melt volume-flow rate of dried granules | Test condition 230 °C / 21.6 kg |
Across compressed-air brake circuits on heavy commercial vehicles, PA12 is processed into single-layer tubing where low-temperature impact, road-salt hydrolysis resistance, and dimensional reproducibility determine batch acceptance. The extrusion formulation uses 100 parts by mass Vestamid L1801 nf, 0.8–1.5 parts by mass carbon black masterbatch, and 0.2–0.5 parts by mass processing aid to stabilise the melt curtain; no external plasticiser is used because brake-line cold impact requirements under SAE J844 are met by PA12 backbone flexibility. The production line uses a 25:1 L/D single-screw extruder with a vacuum-sizing tank and internal air pressure regulated to hold inside diameter within ±0.05 mm. Melt temperature is maintained between 220 °C and 235 °C, and barrel temperatures above 250 °C are avoided to prevent oxidative discoloration and visible gel formation. Residual moisture after drying is held below 0.08 %; a lot is rejected when the first 100 m shows ID collapse greater than 0.1 mm after 4 h vacuum retention. Finished products are coiled air brake tubing assemblies in outside diameters from 9.5 mm to 16 mm, cut with compression fittings, and tested per ISO 7628-1 and DIN 74324-1 where applicable.
The use of an unplasticized natural PA12 grade in an unbonded flexible pipe pressure sheath imposes a narrower extrusion window than plasticized PA12 because melt viscosity at 210 °C is higher and relaxed shrinkage after cooling can exceed 0.8 % unless cooling water temperature is staged. Thick-wall extrusion over a metallic carcass requires die land length at least 8× local wall thickness to suppress weld lines; if land length is shorter, the sheath exhibits spiral weld-line weakness at the carcass gap and fails collapse testing at 50 °C before cyclic qualification. Typical barrel conditions start at 190 °C in the feed section, ramp to 230 °C in the metering section, and limit the head to 235 °C; residence time above 220 °C is controlled below 300 s to limit thermo-oxidative chain scission. In qualified pressure-sheath compounds, the addition ratio is 100 parts by mass polymer plus 0.5–1.5 parts by mass heat stabiliser and, where ductility below −20 °C is required, 6–12 parts by mass plasticiser; unplasticized L1801 nf may not reach the same low-temperature strain-at-break without grade modification. Qualification under API 17J and ISO 13628-2 requires autoclave ageing in simulated produced fluid, methanol, and sour gas; published data for this specific configuration using L1801 nf is limited, and end-users must demand lot-specific API 17J validation rather than rely on generic PA12 datasheets. The terminal product is the pressure sheath layer inside dynamic risers, static flowlines, and jumpers with nominal bores between 50 mm and 300 mm, operating at design pressures up to 10,000 psi depending on pipe class.
| Qualification standard | Test condition | Objective |
|---|---|---|
| API 17J / ISO 13628-2 | Design pressure, temperature class, service fluid | Pressure sheath integrity over service life |
| ISO 23936-1 | Simulated produced water, methanol, sour gas ageing | Thermoplastic compatibility with oilfield media |
| ISO 62 | Water immersion at 23 °C | Saturation mass uptake for dimensional stability assessment |
| ISO 527-2 | Tensile test after thermal ageing in synthetic seawater at 80 °C | Residual tensile modulus and yield stress after ageing |
For single-lumen catheter shafts with wall thickness below 0.25 mm, extrusion of Vestamid L1801 nf demands a melt pump and closed-loop vacuum calibration rather than conventional free-tube take-off to maintain concentricity. A radiopaque formulation uses 100 parts by mass resin compounded with 10–20 wt% barium sulphate; the filler must be pre-dried below 0.05 % moisture to prevent dispersed agglomerates that appear as fisheye gels on the inner lumen surface. The process runs on a 24:1 L/D single-screw extruder with screw speeds limited to maintain melt temperature between 215 °C and 235 °C; higher barrel temperatures accelerate filler-driven viscosity rise and create lumen roughness. Downstream, the tubing passes through a chilled-water calibrator at 10 °C and an on-line OD/laser gauge with a control band of ±0.03 mm. Biocompatibility documents must be obtained for the exact lot, because not all natural PA12 grades are supplied with medical dossiers; where lot-specific ISO 10993-1, ISO 10993-5, ISO 10993-10, and USP <88> Class VI evidence is unavailable, VESTAMID Care ML grades become the required alternative. Finished terminal products include diagnostic catheter shafts, introducer sheaths, and proximal shaft segments for intravascular access devices; long-term implant applications are excluded without ISO 10993-6 supporting data.
Engine-compartment sensor cable jackets are extrusion-applied outboard of the copper conductor and primary insulation layer to resist rock-salt slurry, hot oil splash, and vibration-induced abrasion. The jacket formulation is 100 parts by mass Vestamid L1801 nf combined with 0.5–1.0 parts by mass process stabiliser and 0.8–1.5 parts by mass carbon black or mineral-filled masterbatch for UV stabilisation; additive loadings above 3 wt% in this thin-wall configuration reduce elongation at break below accepted ISO 6722-1 values after 3,000 h hot-air ageing. Processing employs a crosshead die fed by a 30:1 L/D single-screw extruder with a melt temperature of 225 °C to 245 °C; line speed is balanced to keep the jacket draw-down ratio below 3:1 because higher draw ratios increase shrinkage and reduce salt-spray resistance measured by LV 112 or SAE J1128. The cooling trough uses a two-stage water bath with the first stage at 55 °C to prevent quench-induced microcracks in wall sections between 0.2 mm and 0.5 mm. Terminal finished articles are sheathed wheel-speed sensor cables, ABS harness segments, and engine-bay camera cables; the jacket is not intended as primary electrical insulation.
Where beverage dispensing tubes require lot-specific migration compliance, extrusion is conducted only after lot-specific documentation demonstrates compliance with FDA 21 CFR 177.1500 and EU 10/2011. The formulation is a single-component system of 100 parts by mass resin with no external plasticiser; if a dark tint is required, a food-contact carbon black masterbatch is added at 0.5–1.0 parts by mass. Extrusion is carried out on a 28:1 L/D single-screw extruder using a polished inner-diameter calibrator and melt temperatures from 215 °C to 230 °C to reduce extractable oligomer formation; higher melt temperatures increase low-molecular-weight fractions that must be controlled under migration testing. The process includes an in-line burst-pressure check at 2× working pressure and a 24 h water flush before release for food-contact use. Terminal finished products are beverage syrup transfer tubes, dairy sampling lines, and water-filtration tubing with outside diameters from 6 mm to 12 mm; polymer formulations containing unapproved amine-based antistatic additives are excluded because they introduce non-listed migrating species relevant to EU 10/2011 specific migration limits.
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Evonik VESTAMID L1801 nf is a natural, fine-particle polyamide 12 (PA12) resin whose “dry properties” designation in technical datasheets refers to a dataset generated on specimens dried to a residual moisture content below 0.10 wt%, not on specimens conditioned to equilibrium at 23 °C and 50 % RH in accordance with ISO 291. The grade is supplied in powder form for fluidized-bed coating, electrostatic spraying, and powder-based melt processing. Its unfilled, semi-crystalline structure yields a density of approximately 1.01 g/cm³ per ISO 1183-1 and a crystalline melting temperature near 178 °C by differential scanning calorimetry per ISO 11357-3. Unlike glass-fibre-reinforced PA12 compounds, L1801 nf contains no fibrous reinforcement; unlike conventional pelletized PA12 extrusion grades, the nf particle form enables direct powder handling on coating lines but requires attention to moisture uptake and conveying behaviour.
Within the VESTAMID L-series, L1801 nf is differentiated by its natural, fine-particle supply form rather than by a heat-stabilizer or plasticizer package. This product form distinction changes handling requirements on a production line: powder feeders require hopper agitation and closed conveying, while pellet-fed extruders do not. Particle-size distribution and dry flow are therefore critical lot-release characteristics for L1801 nf in a way that does not apply to pelletized PA12 grades.
Dry-state mechanical values for L1801 nf are generally higher in modulus and lower in ductility than conditioned values because absorbed moisture acts as an internal plasticizer in PA12. The equilibrium moisture uptake at 23 °C and 50 % RH is about 0.7 wt%, while water saturation tested to ISO 62 is approximately 1.5 wt%. This is markedly lower than the saturation uptake of unreinforced PA6 and PA66, which can exceed 8 wt% under equivalent conditions. The consequence for design is that dry-state data represent the upper stiffness and lower impact-ductility boundary; long-term humid service shifts the material toward lower modulus and higher elongation. The dry dataset is therefore appropriate for initial stiffness calculations, for applications with intermittent humidity exposure, or for components that are tested immediately after drying.
Tensile testing to DIN EN ISO 527-1/-2 on dry L1801 nf typically reports a yield stress near 45 MPa and a yield strain between 5 % and 8 %. The dry tensile modulus is approximately 1500 MPa, and the flexural modulus determined to ISO 178 lies near 1300 MPa. Charpy notched impact strength to ISO 179-1/1eA at 23 °C is reported in the range of 6–9 kJ/m², and Shore D hardness to ISO 868 is approximately 75. Low-temperature impact retention is a recognized feature of PA12 chemistry, with unreinforced PA12 often retaining notched Charpy values above 4 kJ/m² at −30 °C; published data for this specific L1801 nf configuration is limited, so low-temperature values should be validated on production specimens. The dry-state dataset places this grade in the non-reinforced aliphatic polyamide class, with lower stiffness than PA66 but lower water sensitivity and better low-temperature ductility.
| Property | Test method | Dry-state typical value |
|---|---|---|
| Density | ISO 1183-1 | 1.01 g/cm³ |
| Melting temperature (DSC) | ISO 11357-3 | 178 °C |
| Tensile modulus | DIN EN ISO 527-1/-2 | 1500 MPa |
| Tensile stress at yield | DIN EN ISO 527-1/-2 | 45 MPa |
| Tensile strain at yield | DIN EN ISO 527-1/-2 | 5–8 % |
| Flexural modulus | ISO 178 | 1300 MPa |
| Charpy notched impact strength, 23 °C | ISO 179-1/1eA | 6–9 kJ/m² |
| Shore D hardness | ISO 868 | 75 |
| Water absorption, saturation | ISO 62 | approx. 1.5 wt% |
The principal difference between L1801 nf and PA6 or PA66 grades lies in moisture regain and low-temperature impact retention. Unreinforced PA6 absorbs approximately 9.5 wt% water at saturation to ISO 62, and unreinforced PA66 absorbs approximately 8.5 wt%, while PA12 absorbs about 1.5 wt%. This produces less dimensional change in humid environments and less plasticization-induced modulus loss. The dry tensile modulus of L1801 nf near 1500 MPa is lower than the 3000 MPa range typical for dry PA66 and PA6; therefore, L1801 nf is not a stiffness-for-weight replacement for engineering polyamides when dry modulus is the controlling design parameter. Against other PA12 grades, the nf designation indicates a natural, fine-particle product form rather than a heat-stabilized, plasticized, or fibre-reinforced variant. In fluidized-bed coating, the fine particle form improves deposit uniformity on complex shapes, but it also increases the exposed surface area and therefore moisture adsorption rate during open storage.
| Property | VESTAMID L1801 nf PA12 dry | Unreinforced PA6 dry | Unreinforced PA66 dry |
|---|---|---|---|
| Density | 1.01 g/cm³ | 1.13 g/cm³ | 1.14 g/cm³ |
| Water absorption, saturation | approx. 1.5 wt% | approx. 9.5 wt% | approx. 8.5 wt% |
| Dry tensile modulus | 1500 MPa | 3000 MPa | 3100 MPa |
| Charpy notched impact at −30 °C | >4 kJ/m² | often <2 kJ/m² | often <2 kJ/m² |
The dry-state characterization of L1801 nf follows polyamide 12 morphology. The crystalline melting temperature of 178 °C and the glass transition temperature near 45 °C by dynamic mechanical analysis to ISO 6721-1 mean that dry mechanical testing at 23 °C is performed on a semi-crystalline matrix in which the amorphous phase is below its glass transition. This condition explains the higher dry modulus and the relatively low yield strain compared with conditioned PA12. The recrystallization behaviour during cooling from the melt influences coating film morphology; in powder coating, the cooling rate from post-fusion to 100 °C controls the degree of crystallinity and therefore the coating hardness and impact behaviour. Slow cooling produces higher crystallinity and slightly higher stiffness, while quenching reduces crystallinity and increases ductility but may increase residual stress in thick films.
L1801 nf in powder form is used on fluidized-bed coating lines where a preheated metal insert is immersed into a fluidized powder bed, and on electrostatic spraying lines where charged powder is directed onto a grounded substrate. Powder moisture control is critical because residual moisture above 0.10 wt% degrades electrostatic transfer efficiency and produces pinholes or foaming in the fused film. Drying of powder in a recirculating air oven at 80 °C for 4–8 h or in a vacuum dryer at 80 °C is recommended before extended coating campaigns. The fluidizing air should be dry, with a dew point below −20 °C, to prevent re-humidification of the powder. Fusion and levelling are typically completed in a post-heat zone at 180–200 °C; line speed and part mass determine the required dwell, and published data for this specific powder configuration is limited. In melt extrusion, non-reinforced PA12 processes readily on single-screw extruders with 24:1 to 30:1 L/D ratios and conventional three-zone screws; barrel temperatures between 220 °C and 250 °C are typical, with melt temperature measured by hand-held thermocouple not exceeding 250 °C.
Direct injection molding of powder-form PA12 on standard reciprocating-screw machines can require a vented barrel because entrained air lowers melt density and shot-weight consistency. If accurate shot weights fall outside ±0.5 % relative standard deviation, pre-compounded pellet feed or a crammer feeder is used. For thin-walled components with flow lengths above 200 mm, higher melt temperatures near 240 °C and injection velocities above 100 mm/s are often necessary, but grade-specific spiral-flow data for L1801 nf is limited. Clamp force requirement follows standard PA12 melt rheology; for unfilled PA12, a clamping pressure of 30–50 N/mm² of projected area can be used as a preliminary estimate in tool design. This estimate is not a substitute for mold-filling simulation based on measured shear-viscosity data.
The dry-state dataset is not a processing guarantee for wet powder. Polyamide 12 adsorbs moisture on open storage; at ambient relative humidity above 60 %, the powder surface moisture can exceed 0.10 wt% within 8–24 h depending on air circulation. Drying before processing is therefore a lot-level control point, not a one-time laboratory preparation. Moisture analyzers using the loss-on-drying method should be validated against Karl Fischer titration because polyamide 12 can release low levels of residual monomers or additives during heating and bias thermogravimetric moisture readings.
Rheological data for L1801 nf are less widely published than for pelletized PA12 grades. Melt viscosity at a shear rate of 100 s⁻¹ and 230 °C should be obtained from the manufacturer, because powder particle size and stabilizer package affect measured values when the powder is first melt-compounded. In coating operations, the dry particle-size distribution controls fluidization and spray behaviour; a fine fraction below 20 µm can create dusting and poor fluidization, while a coarse fraction above 200 µm reduces edge coverage. Published data for the d10, d50, and d90 of L1801 nf is limited in public literature, but typical fluidized-bed-grade PA12 powders are supplied with controlled particle-size distributions and dry flow measurements according to ISO 6186.
The unfilled PA12 nature of L1801 nf requires confirmation of compliance with food-contact, potable-water, and medical standards before use. The manufacturer’s declaration should be obtained for FDA 21 CFR 177.1500, EU 10/2011, and REACH SVHC status; statements on raw-material conformity are batch-specific and depend on stabilizers and processing aids in the final supplier formulation. The dry-state data do not address continuous hot-water service. PA12 hydrolysis in acidic or strongly oxidizing media above 80 °C is an operational boundary; exposure to strong acids, oxidising agents, or high concentrations of amines should be evaluated by immersion testing before production. Reclaimed powder from electrostatic spraying should be blended with virgin powder at rates no higher than 20 wt% unless line-specific validation demonstrates comparable deposition efficiency and film integrity.
In dry-state applications, L1801 nf is used for corrosion-protective coatings on steel pipe fittings, dishwasher baskets, and mechanical slide surfaces where low water absorption and high impact retention are required. The dry tensile modulus of 1500 MPa is sufficient for resilient coatings that tolerate local deformation without cracking, but it is not a replacement for reinforced PA12 in structural load-bearing parts. The absence of fibrous reinforcement also reduces the abrasive wear of mating polymer or soft metal surfaces compared with glass-filled polyamides. For outdoor exposure, UV stabilization must be specified separately because the natural unfilled powder does not inherently resist long-term ultraviolet weathering; accelerated weathering per ISO 4892-2 is recommended for product qualification.
