| HS Code | 457735 |
| Material | Polyamide 12 (PA12 / Nylon 12) |
| Density | 1.02 g/cm³ |
| Melting Point | 178 °C |
| Tensile Strength | 42 MPa |
| Elongation At Break | 300 % |
| Flexural Modulus | 1300 MPa |
| Notched Izod Impact | 20 kJ/m² |
| Water Absorption 24h | 0.25 % |
| Melt Flow Rate 230 C 2 16kg | 2.5 g/10min |
| Heat Deflection Temperature 1 8mpa | 55 °C |
As an accredited Polyram PlusTek PD1002NT Nylon 12 for Extrusion factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg sealed bags, protecting Nylon 12 granules from moisture and contamination for extrusion. |
| Container Loading (20′ FCL) | 20′ FCL shipment of Polyram PlusTek PD1002NT Nylon 12 extrusion-grade pellets, securely packed in bags, palletized, and containerized. |
| Shipping | Polyram PlusTek PD1002NT Nylon 12 ships as moisture-sensitive pellets in sealed, protective packaging, palletized and stretch-wrapped to prevent damage. Avoid prolonged heat and humidity during transit. Transport via standard ground freight is typical; air and ocean options available. Ensure packaging remains intact and dry until ready for extrusion. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and ignition. Keep the container tightly sealed to prevent moisture absorption, which degrades the material. Avoid contact with oxidizing agents and strong acids. Maintain stable temperatures, and use first-in, first-out rotation to ensure optimal extrusion performance and shelf life. |
| Shelf Life | Shelf life is typically 2 years from manufacture date when stored in original, unopened packaging under dry, cool conditions. |
In automotive multilayer fuel and vapour return lines, Polyram PlusTek PD1002NT is positioned as the outer PA12 jacket rather than as the primary permeation barrier. The structure is usually co-extruded with a carbon black-filled conductive PA12 or fluoropolymer inner layer, a maleic-anhydride-grafted tie resin, and PD1002NT as the outer layer through a five-layer spiral mandrel head with an outer layer die gap of 0.8 mm to 1.2 mm. For an 8 mm outside diameter tube with a total wall of 1.0 mm, the outer PA12 layer is controlled between 0.20 mm and 0.45 mm, because thicker outer layers raise low-temperature stiffness and increase the mass of extractable low-molecular-weight oligomers in the vapour space. The die-entry melt temperature for the outer layer is held at 242 °C ± 4 °C, based on typical extrusion-grade PA12 processing windows, with the adapter at 235 °C and the screw barrel zoned from 200 °C at the feed section to 230 °C at the metering section. A 45 mm single-screw extruder with L/D 28:1 and a three-zone barrier screw with a compression ratio of 2.5:1 is paired with a desiccant dryer set at 80 °C for 4 h, producing pelleted moisture below 0.10 % before the hopper. Residual moisture is measured per ISO 15512; a target of 0.10 % or lower is maintained because water at 0.15 % shifts melt viscosity and changes layer distribution in the spiral mandrel. The tube line uses vacuum calibration at −0.06 MPa and a closed-loop diameter gauge that holds outside diameter tolerance to ±0.05 mm; downstream, the assembly is tested per SAE J2260 for low-temperature impact at −40 °C, pressure cycling, and resistance to automotive fluids. Because the outer PA12 layer is not the primary barrier, permeation compliance is assigned to the fluoropolymer or barrier inner layer, and PD1002NT contributes impact, torsional stiffness, and protection against stone impingement. The grade is not formulated as a conductive layer; if a conductive outer surface is required for static dissipation, a carbon black concentrate must be added at 2 wt% to 5 wt%, which will reduce elongation and require a 5 °C to 10 °C upward adjustment of the die temperature.
Air brake tubing extruded from PA12 is produced in nominal outside diameters from 6 mm to 16 mm and wall thicknesses from 1.0 mm to 2.0 mm, depending on trailer length and service pressure. The sizing step is the main process constraint because PA12 solidifies over a narrow range between roughly 170 °C and 180 °C; the tube enters the calibration sleeve while the outer skin is above the crystallization onset temperature. A vacuum tank holding −0.05 MPa to −0.08 MPa and water inlet temperature below 40 °C fixes outside diameter and reduces ovality to less than 0.05 mm on a 12 mm outside diameter tube. Downstream qualification uses SAE J844 as the baseline specification, with burst pressure testing at room temperature and after elevated-temperature soak. OEM-specific acceptance typically imposes a minimum burst safety ratio of 4:1 over the rated working pressure; a line rated at 1.0 MPa would therefore be tested to 4 MPa before fitting assembly. PD1002NT processed at a melt temperature above 250 °C may develop low-viscosity regions that shift draw-down and produce wall eccentricity above 0.05 mm; below 220 °C, unmelted spherulites appear as surface roughness. A 30 mm or 45 mm single-screw extruder with L/D 24:1, a compression ratio of 2.5:1, and a downstream puller with closed-loop diameter feedback is the baseline line configuration. The tube should not be run through a single-stage vacuum bath at water temperatures above 60 °C, because rapid surface crystallization creates a frozen skin that later cracks during flare forming. A pull speed of 10 m/min to 25 m/min is common for small-bore brake tubing, though published process data specific to PD1002NT for this configuration are limited.
| Application layer | Test standard | Measured parameter | Typical acceptance basis |
|---|---|---|---|
| PA12 outer jacket, multilayer fuel line | SAE J2260 | Low-temperature impact | −40 °C, no cracking |
| Truck air brake tube | SAE J844 | Burst pressure | Safety ratio 4:1 over service pressure |
| Wire and cable sheath | IEC 60811-401 | Elongation retention after ageing | ≥ 80 % retention |
| Pneumatic control tube | ISO 1167 | Internal pressure resistance | 20 °C and 60 °C water-in-water |
| Regulatory baseline | RoHS Directive 2011/65/EU | Heavy metals | Lot declaration |
| Food-contact status | FDA 21 CFR 177.1500 | Resin compliance | Only if supplier declaration applies |
Fibre-optic loose tube and automotive cable sheath extrusion uses PA12 because the equilibrium moisture absorption at 23 °C and 50 % RH is below 1.0 %, which reduces dimensional shrinkback after installation compared with PA6 or PA66. In a crosshead die with melt pressure between 12 MPa and 20 MPa, PD1002NT is drawn over a slack buffer tube at line speed from 25 m/min to 80 m/min, depending on sheath wall thickness from 0.5 mm to 1.5 mm. Melt temperature at the crosshead is held at 235 °C ± 5 °C; above 248 °C the low-molecular-weight fraction in PA12 can migrate to the die lip and form die drool, which disrupts concentricity and creates local thin spots. After extrusion, the sheath is sampled for tensile strength and elongation retention per IEC 60811-401, with acceptance typically set at 150 % minimum elongation and no greater than 20 % loss after thermal ageing. The natural grade does not contain a UV-stable carbon black package, so outdoor cable applications require a carbon black masterbatch with particle size 20 nm to 50 nm added at 2 wt% to 5 wt% before the feed throat. A desiccant dryer with an air dew point below −40 °C and a residence time of 4 h at 80 °C keeps feed moisture below 0.10 %; otherwise the jacket develops surface splay and a measurable reduction in tensile yield strength. For loose-tube fibre cable, tube wall thickness is often 0.2 mm to 0.4 mm, and line speed can exceed 150 m/min when the screw, crosshead, and die pressure are matched.
When PD1002NT is used as the outer cover compound for spirally reinforced pneumatic control tubing, the process objective is to avoid printing the reinforcement pattern onto the tube surface. The co-extrusion crosshead is set with a die exit melt temperature of 238 °C ± 3 °C and a head pressure of 10 MPa to 16 MPa; the outer cover thickness is set between 0.8 mm and 1.5 mm depending on coupling force. A vacuum sizing plate with an aperture of 8.0 mm for an 8 mm outside diameter tube and water inlet at 35 °C to 45 °C fixes the final dimension and provides a roundness value below 0.04 mm. The completed tube is tested against ISO 1167 for internal pressure resistance at 20 °C and 60 °C, with short-term burst pressure assessed after conditioning. For control lines rated at 1.0 MPa, the acceptance burst pressure is commonly specified at 4 MPa, giving a 4:1 safety margin. The PA12 cover must be free of pinholes when tested with a conductive inner layer and a spark tester at 6 kV; pinhole sources are often traced to moisture splay or to excessive draw-down between the crosshead and the sizing plate. Reducing draw-down to below 1.1:1 and holding melt temperature below 245 °C are the two primary corrections. If the line speed rises above 30 m/min, a second vacuum stage is required because single-stage cooling may not remove enough heat before the puller, causing the tube to flatten under the caterpillar belt pressure of 0.2 MPa to 0.4 MPa.
Melt temperature is often treated as the primary process variable in PA12 extrusion, but moisture content upstream of the screw introduces a viscosity shift that can be misdiagnosed as a barrel heating fault. PD1002NT pellets are exposed to ambient air during hopper loading; at relative humidity above 60 %, surface moisture uptake within 30 min can be sufficient to increase melt flow during the first 20 min of extrusion. A desiccant-bed dryer with a dew point below −40 °C and an air flow rate of 0.5 m³/h per kg/h throughput is required to reduce moisture from a packaged level of 0.25 % to below 0.10 % at 80 °C for 4 h. The barrel temperature profile is set from 200 °C in the feed zone to 220 °C in the compression zone, 230 °C in the metering zone, and 235 °C at the adapter, with the die held at 240 °C. Screw speed is adjusted to maintain melt pressure at the breaker plate between 10 MPa and 18 MPa, using a screen pack of 40/60/80 mesh. If melt pressure falls below 8 MPa at constant screw speed, the cause is usually moisture-induced viscosity reduction or feed bridging, not screw wear. A purge compound with a viscosity approximately 1.5 times higher than PD1002NT should be run after any delay longer than 30 min at die temperatures above 255 °C, because residual oxidized material forms gel particles that appear as surface specks. The defect called snakeskin appears at the free surface when the inner melt freezes while the outer surface is still in the draw-down zone; lowering the water bath temperature to 30 °C and increasing vacuum to −0.07 MPa suppresses this condition.
Flexible corrugated conduit extruded from PD1002NT is produced on a vacuum corrugator rather than a simple sizing sleeve. The extruder delivers a tube parison to the corrugator at a melt temperature of 235 °C to 245 °C; the parison enters a reciprocating mold block line with block temperature between 60 °C and 80 °C and vacuum channels holding −0.06 MPa to −0.09 MPa to form the convolutions. The outer profile is specified for engine-harness routing where abrasion resistance against sheet-metal edges, resistance to hot engine oil, and low-temperature flexibility at −40 °C are required. The PA12 conduit is assessed according to OEM-specific mechanical load schedules, often derived from LV 112 or equivalent wiring standards, with impact and crush tests performed at room temperature and at −40 °C. Dimensional recovery after heat exposure is measured using a circulation oven at 120 °C for 1 h, with longitudinal shrinkback typically limited to less than 2 %. Wall thickness is not uniform; the trough wall is usually 0.3 mm to 0.7 mm and the crest wall is 0.5 mm to 1.0 mm, requiring a screw with consistent melt homogeneity because thickness variations amplify surface turbulence. A grooved feed section improves pellet transport when high line speed above 50 m/min is used, and a melt pump is added upstream of the corrugator to eliminate surging caused by the reciprocating mold blocks. The natural PA12 grade must be compounded with a carbon black masterbatch and a heat stabilizer package before the corrugator if the conduit is to be exposed to underhood temperatures above 125 °C for repeated thermal cycles.
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Polyram PlusTek PD1002NT Nylon 12 for Extrusion is an unfilled polyamide 12 compound designated for continuous melt-shaping operations such as tube, hose, cable jacket, and profile extrusion. The PD1002NT grade identifier separates polymer family, processing route, and pellet presentation; the NT suffix is consistent with a natural, unpigmented feedstock, although the exact additive package and colorant content must be confirmed against the supplier’s commercial data sheet. Because this grade is identified as an extrusion material rather than an injection molding feedstock, its melt rheology and molecular architecture are intended to support draw-down control, low-sag melt behavior, and stable diameter capability on single-screw and twin-screw extrusion lines. Published lot-specific data for PD1002NT is limited in public sources; therefore, the property and processing values referenced in this document are representative for unfilled PA12 extrusion compounds and should not replace supplier certificates of analysis or first-article qualification.
The governing difference is moisture-dependent process stability. Saturated water absorption for polyamide 12 measured according to ISO 62:2008 is approximately 1.5–2.0% by mass at 23 °C, while PA6 and PA66 grades commonly reach 9–10% under equivalent exposure. This lower equilibrium moisture uptake reduces the rate of hydrolytic chain scission during extrusion and limits dimensional movement in finished articles exposed to humid air. For processors, the practical consequence is a wider drying and residence-time window before melt viscosity loss becomes detectable as bubble formation, melt-pressure drift, or surface roughness. The same property also differentiates PD1002NT-class PA12 from PA6 in cable sheathing and pneumatic tubing, where wet-conditioned part dimensions and mechanical behavior are more stable after installation in unheated or buried service environments.
Compared with PA6 and PA66, PA12 has a lower amide-group density because the repeating unit contains a longer methylene sequence. The lower polarity reduces plasticization by absorbed water and contributes to a more gradual loss in tensile modulus between dry and conditioned states. In extrusion, this is encountered as less fluctuation in melt viscosity when pellet moisture content rises from 0.05% to 0.15%. The processing effect is not zero; residual moisture above 0.15% still promotes hydrolysis, but the tolerance band is broader than that of PA6, which typically requires moisture below 0.10% before melt processing.
Against PA11, the difference is narrower. Both are long-chain aliphatic polyamides with low moisture uptake and good cold impact. PA12 generally has a slightly lower melting range and lower equilibrium water absorption, while PA11 may offer a different balance of flexibility and notch resistance. Against PA612, PA12 typically has lower density and lower saturated water absorption, while PA612 may display different dimensional recovery and chemical resistance. For an extrusion converter, the substitution decision is not solely a melting-point comparison; die land length, screw compression ratio, and vacuum-tank calibration settings must be adjusted because the melt elastic response and crystallization rate differ by grade.
The compound should be dried to a residual moisture content below 0.10–0.15% before feeding. Desiccant drying at 80–90 °C for 4–8 h is typical for unfilled PA12, with a supply dew point of -40 °C or lower. Bags opened in relative humidity above 60% for more than a few hours should be re-dried. The melting range for general-purpose PA12 is approximately 170–180 °C, with extrusion melt temperatures commonly set between 210 °C and 250 °C depending on die geometry, line speed, and screw shear input. Barrel settings above 260 °C accelerate thermal-oxidative branching, gel deposition on screen packs, and yellowing of natural, uncolored material.
On production-scale single-screw machines with screw diameters from 45 mm to 60 mm and L/D 30:1 to 36:1, melt temperature measured at the adapter can run 10–15 °C above the last barrel setpoint because of viscous heating in the metering zone. A three-zone barrier screw with a compression ratio of 2.5:1 to 3.5:1 is commonly used to maintain consistent solids conveying and melt homogeneity. Filtration through a 60/80/100 mesh screen pack is typical for profile and tube lines; finer filtration may raise melt pressure and residence time. Melt-pressure variation from pellet feed nonuniformity can be reduced with a gear pump placed before the die, particularly when wall thickness tolerance is specified at ±0.10 mm or tighter. If melt pressure at the screen pack rises rapidly during a run, the cause is usually contamination, insufficient melt temperature, or polymer gel accumulation rather than normal viscosity shift.
The table below lists property axes relevant to an incoming inspection or supplier test summary for an unfilled PA12 extrusion compound. The ranges are representative for PA12 extrusion grades and are not PD1002NT production values.
| Property | Test method | Representative unfilled PA12 extrusion-grade range |
|---|---|---|
| Density | ISO 1183-1:2019 | 1.01–1.03 g/cm³ |
| Melt mass-flow rate, 235 °C/5 kg | ISO 1133-1:2022 | 5–15 g/10 min |
| Tensile modulus | ISO 527-2:2012 | 1100–1500 MPa |
| Tensile stress at yield | ISO 527-2:2012 | 35–45 MPa |
| Nominal strain at break | ISO 527-2:2012 | 150–300% |
| Notched Charpy impact, 23 °C | ISO 179-1/1eA:2010 | 7–15 kJ/m² |
| Saturated water absorption, 23 °C | ISO 62:2008 | 1.5–2.0% |
These values shift when the compound is impact-modified, plasticized, or heat-stabilized. Plasticized PA12 grades used for flexible tubing can exhibit Shore D hardness below 70 and higher elongation, while unplasticized extrusion grades maintain higher modulus and better collapse resistance. PD1002NT is described as an extrusion-grade PA12 rather than a flexibilized tube compound; therefore, its hardness and flexural modulus should fall toward the stiffer end of the PA12 range unless supplier documentation indicates otherwise.
Chemical resistance boundaries are important in grade selection. PA12 performs well in aliphatic hydrocarbons, hydraulic oils, diesel fuel, zinc-free greases, and many salt solutions. It is not suitable for continuous contact with strong mineral acids, formic acid, phenols, or concentrated oxidizing media. Zinc chloride solutions are a known stress-cracking environment for PA12 and can shorten service life when cable conduits or pneumatic lines are exposed to galvanized hardware drainage. Natural, unpigmented PD1002NT extrudate should be considered UV-limited; outdoor applications require carbon black-filled or formulated UV-stabilized material, and the uncolored grade alone should not be claimed as weather-resistant.
Dimensional control in PA12 tube and profile extrusion is governed by the interaction of die swell, melt strength, draw ratio, and vacuum calibration. If melt temperature is too low, typically below 210 °C, residual melt elasticity can produce surface melt fracture, high die pressure, and poor gauge control. If melt temperature exceeds 250 °C, viscosity reduction may cause die drool, centerline sag in larger profiles, and loss of draw-down consistency. The calibration sleeve vacuum must be set to prevent wall collapse while avoiding excessive friction that induces chatter marks and out-of-roundness. Water quench temperature between 20 °C and 50 °C is common; lower quench temperature produces finer crystallite size and higher line-speed stability in thin-wall tubing, while elevated quench temperature reduces frozen-in stress but may slow dimensional stabilization.
A practical extrusion fault associated with nylon 12 is the accumulation of low-molecular-weight degradation products at the die lip. This appears as a gradual buildup that disrupts surface finish and requires periodic die-lip cleaning. The fault is intensified by high barrel temperatures, low moisture content below 0.02%, and long residence time above 15 min. When PD1002NT is run on a line with a melt pump, pressure variation at the die can be held below ±0.5% of setpoint on properly sized equipment, but this depends on consistent pellet feed and clean screens. If the pressure signal oscillates beyond that value, the first checks are bridging in the feed throat, screen-pack blinding, or screw wear in the metering section.
Extruded articles produced from this product class are often specified by end-use standards rather than by resin specification alone. Air brake tubing may be validated against SAE J844, and automotive thermoplastic tubing may be assessed under ISO 7628-1 or application-specific OEM standards. Cable jacketing requirements depend on construction and service voltage; the resin contributes to jacket properties but does not by itself confer cable certification. Finished-part testing is required for burst pressure, cold impact, chemical exposure, and heat aging. Because published configuration-specific data for PD1002NT in these applications is limited, processors should generate first-article data on their own extrusion line and die geometry before substituting this grade into a qualified article.
Differences from other PA12 products also appear in lot-to-lot melt flow variation and additive package. Some PA12 extrusion grades are nucleated for faster crystallization and improved gauge control in thin-wall tube at high line speed; others are lightly lubricated or heat-stabilized for improved processing. The PD1002NT grade designation indicates the base polymer and processing class, but the exact stabilization system and melt-flow target should be taken from the supplier’s technical data sheet and lot certificate. Incoming inspection should include moisture content, melt flow rate, and visual color consistency. The natural grade is especially sensitive to thermal history, so color shift between lots can indicate melt-temperature excursions or inconsistent stabilization rather than pellet contamination.
For processors evaluating PD1002NT against a PA6 or PA66 tube compound, the primary differences are lower water absorption, lower density, and a lower processing temperature. These differences reduce drying energy and permit lower barrel-temperature settings, but PA12 typically commands a higher polymer cost and may require longer conditioning after extrusion to reach equilibrium dimensions. The lower density of PA12 also means that a fixed-length tube weighs less than an equivalent PA6 tube at the same wall thickness, which affects downstream pricing and transport specifications. The dimensional change from dry-as-extruded to conditioned state is smaller for PA12 than for PA6, but it is not zero and must be accommodated in tolerance calculations for fittings and connectors.
In multi-layer coextrusion with EVOH barrier layers, PA12 may be used as an outer jacket or tie-layer substrate because of its moisture resistance and compatibility with common polyolefin tie resins. Line speed and layer distribution must be adjusted to the melt-strength characteristics of the PA12 grade; low-sag behavior is critical for maintaining barrier-layer thickness uniformity. If the outer PA12 layer is too soft or too hot, interlayer instability can produce wavy interfaces that reduce barrier performance. Conversely, if the PA12 layer is processed too cold, interlayer adhesion may fall below the level required by peel-test specifications such as ISO 8510-1 or customer-specific performance windows.
Supplier documentation remains the controlling source for product-specific values, shelf-life recommendations, and regulatory assurances. Compliance statements for REACH EC 1907/2006, RoHS 2011/65/EU, and food-contact frameworks such as FDA 21 CFR 177.1500 or EU 10/2011 apply only when confirmed in writing by the supplier for the specific lot and end-use condition. The generic PA12 processing and performance ranges provided here establish a technical baseline for extrusion evaluation but do not constitute a product specification for Polyram PlusTek PD1002NT Nylon 12 for Extrusion.
