| HS Code | 954341 |
| Polymer Family | Polyamide 12 (PA12) |
| Grade | Evonik VESTAMID LX9012 T8 |
| Density | 1.01 g/cm³ |
| Melting Point | 178 °C |
| Glass Transition Temperature | 40 °C |
| Tensile Modulus | 300 MPa |
| Tensile Strength | 35 MPa |
| Elongation At Break | 300% |
| Shore Hardness | 55 Shore D |
| Charpy Impact Strength | No break at 23 °C |
| Water Absorption 24h | 0.8% |
| Heat Deflection Temperature 0 45mpa | 60 °C |
As an accredited Evonik VESTAMID® LX9012 T8 Nylon 12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Evonik VESTAMID LX9012 T8 Nylon 12 is supplied as a free-flowing powder in sealed, moisture-protective packaging. Quantity: 10 kg per container. |
| Container Loading (20′ FCL) | 20′ FCL container loading of Evonik VESTAMID LX9012 T8 Nylon 12: palletized bags, secured with dunnage, moisture-protective, and weight-balanced for safe transport. |
| Shipping | VESTAMID® LX9012 T8 nylon 12 ships as non-hazardous polymer granules in sealed, moisture-proof bags or drums. Store in a cool, dry area away from heat and direct sunlight. Avoid dust accumulation; ensure dry conditions during transport to prevent moisture absorption and maintain material integrity. |
| Storage | Store VESTAMID® LX9012 T8 in its original, unopened packaging in a cool, dry, well-ventilated area. Protect from direct sunlight, heat, and humidity to prevent moisture absorption. Keep away from incompatible materials and ignition sources. Maintain sealed containers when not in use; use within the manufacturer’s specified shelf life for optimal performance. |
| Shelf Life | Store in original sealed packaging, away from moisture and heat. Shelf life is typically two years from the production date. |
In truck and bus air brake systems, VESTAMID® LX9012 T8 is converted into 6 mm to 16 mm outside diameter tube with wall thickness held at 1.0 mm to 2.0 mm. The grade is run on a single-screw extruder with a 30:1 L/D barrel and a barrier screw having a compression ratio of 2.2:1 to 2.5:1. A screen pack of 60/80/100 mesh is positioned ahead of the breaker plate. Barrel set points are 190 °C in the feed zone, 215 °C in the compression zone, 225 °C in the metering zone, 225 °C at the adapter, and 210 °C at the die. Melt temperature measured at the die exit should not exceed 230 °C. Above 240 °C plasticizer vaporization produces die lip deposit and surface roughness on the outer skin. Pre-drying in a desiccant dryer at 80 °C for 4 h is required when residual pellet moisture is above 0.1% by weight. Drying air dew point is maintained at -40 °C. Vacuum sizing pulls the extrudate through a calibration sleeve with vacuum set between 0.02 MPa and 0.06 MPa. Water bath temperature is controlled from 15 °C to 25 °C. A post-extrusion annealing step at 120 °C for 30 min reduces residual hoop stress before cold-impact evaluation.
Compliance for production tubing is tested under SAE J844. Dimensional acceptance is tied to ISO 7628 for road vehicle pneumatic braking lines. In coextruded low-permeation fuel vapor tube using an EVOH barrier, a typical wall distribution is 0.7 mm outer PA12, 0.1 mm EVOH, 0.2 mm inner PA12, and two tie layers totaling 0.1 mm. This configuration leaves the PA12 outer skin as the mechanical protection layer and the inner PA12 layer as the moisture barrier for the EVOH. Terminal articles include trailer air brake coil lines, frame routing tubes, and suspension leveling lines. Fabricators must complete third-party qualification for each tube geometry because the compound itself is not a pre-approved finished article. The primary processing boundary is moisture: above 0.1% residual moisture, hydrolysis during melt conversion lowers molecular weight and burst pressure can fall below the service temperature class minimum. Published data for this specific T8 black formulation in multilayer coextruded barrier fuel vapor tube is limited, so qualification is normally completed on a project-specific basis.
Offshore unbonded flexible pipe internal pressure sheaths made from VESTAMID® LX9012 T8 are extruded over an interlocked steel carcass when the fluid analysis confirms compatibility with aliphatic hydrocarbons, salt water, and methanol injection. In this operation the tube diameter can reach 400 mm and the wall thickness is held between 5 mm and 25 mm depending on design pressure and water depth. The extrusion line uses a single-screw extruder with a 30:1 L/D barrel and a grooved feed section. Barrel temperatures are kept in the 200 °C to 230 °C range. Melt temperature is limited to 235 °C because a higher value accelerates plasticizer loss and produces local thinning at the die exit. Internal air pressure maintains circularity during cooling, while external water spray quench reduces the outer surface temperature. The target wall thickness tolerance is ±10% of nominal, and ovality is controlled below 2%. Rapid quenching is followed by an annealing step at 130 °C for 2 h to 4 h to raise crystallinity and improve long-term stress crack resistance.
Qualification follows API 17J and ISO 13628-2 for unbonded flexible pipe. NORSOK M-710 may be invoked for polymeric materials in sour service, but published data for this specific T8 black formulation under high H2S partial pressure is limited. The terminal article is a pressure sheath inside subsea flowlines, gas lift risers, and water injection risers. The central process risk is the combination of moisture carryover and plasticizer volatility; both create microvoids that initiate blistering under rapid gas decompression. Operators applying this grade in sour service typically require project-specific aged tensile and rapid gas decompression programs because the commercial datasheet does not cover all API 17J annex combinations.
Rail vehicle control and jumper cables are jacketed with VESTAMID® LX9012 T8 where low-temperature flexibility and cut-through resistance are required. The pellets are pre-dried at 80 °C for 4 h in a desiccant dryer, then fed to a single-screw extruder with a 24:1 L/D barrel and a screw designed for shear-sensitive nylon. Pressure tooling around the twisted conductor bundle is preferred over tubing tooling to reduce bubble entrapment. Barrel temperatures are set at 200 °C to 220 °C, crosshead temperature at 220 °C, and die temperature at 225 °C. Drawdown ratio is maintained between 1.1:1 and 1.2:1 because higher drawdown causes sheath concentricity loss. Sheath wall thickness is specified as 0.4 mm to 1.2 mm depending on conductor diameter. Line speed ranges from 30 m/min for multi-core rough bundles to 120 m/min for smooth single-core sensor lines.
Compliance for rail cable sheathing is tested against EN 50264-2 for smoke emission and mechanical properties after thermal aging. The T8 grade is not inherently flame retardant; if EN 45545-2 HL3 is required, an FR masterbatch is introduced at 5 wt% to 10 wt% by a compounder, and the resulting melt viscosity shift is compensated with a flat barrel profile. Terminal products include rail vehicle jumper cables, brake control harnesses, and sensor cable jackets. Documentation under REACH and RoHS 2011/65/EU is required for European rail supply. Process failure in this application is most often a pinhole at the conductor bundle crossover point, so the first cooling trough is set at 30 °C and an in-line spark test at 2 kV to 3 kV is applied.
In automated assembly cells, packaging machines, and CNC tool changers, VESTAMID® LX9012 T8 tube is converted as a replacement for copper and TPU where the line must tolerate oil mist, ozone, and low dew-point air without hardening. Tubes are extruded in outside diameters of 4 mm to 16 mm with wall thickness from 0.6 mm to 2.0 mm. The line uses a single-screw extruder at 25:1 L/D, a melt temperature of 210 °C to 230 °C, and vacuum sizing with a calibration sleeve. For an 8 mm outside diameter tube with 6 mm inside diameter, burst pressure at 23 °C is tested to a safety factor of 3:1 against a working pressure of 1.0 MPa. At 60 °C the working pressure is derated to 0.5 MPa. Dimensional tolerance for push-in fitting retention is ±0.05 mm on outside diameter, with ovality held below 0.1 mm.
Compliance is anchored to ISO 14743 for push-in fittings, ISO 1402 for hydrostatic testing of plastic tubing, and DIN 73378 for polyamide tubing dimensions where applicable. The terminal products are pneumatic purge lines, vacuum sensing lines, and safety brake lines on linear actuators. Process rejection is driven by moisture-induced pinholes; pellets exposed to ambient air for more than 30 min at relative humidity above 60% must be re-dried before extrusion. No additional plasticizer is required in normal conversion of the supplied compound.
Melt spinning of VESTAMID® LX9012 T8 into large-diameter monofilament is used for spiral press fabrics and dewatering screens where the filament must survive repeated compression in wet acidic conditions. Extrusion is performed on a single-screw extruder at 25:1 L/D with a gear pump positioned before a spinneret plate having hole diameters from 0.8 mm to 3.0 mm. Melt temperature at the spinneret is held at 225 °C to 235 °C. The extrudate is quenched in water at 30 °C to 40 °C, drawn in two stages to a total draw ratio of 3.2:1 to 4.0:1, and relaxed 3% to 8% in a hot-air oven at 130 °C. Filament diameter after drawing is checked with a laser micrometer to a tolerance of ±0.02 mm. The terminal articles are spiral-link fabrics, paper machine clothing, and filter belt monofilaments.
Compliance in this segment is usually specified through ISO 1805 for netting yarn breaking force and elongation, while the fabric manufacturer applies ISO 9073-1 for mass per unit area. This application is sensitive to uncontrolled cooling: water temperature below 25 °C produces a skin-core morphology that reduces fatigue resistance in wet pressing. Published data for this specific T8 black formulation in paper machine clothing is limited, so spinneret pack pressure and draw ratio must be established on the production line with each lot.
For thermoplastic hydraulic hose used in subsea control systems, VESTAMID® LX9012 T8 is extruded as an inner liner over a mandrel before aramid or steel wire braiding. The liner wall thickness is specified from 0.5 mm to 2.0 mm, and the outside diameter tolerance is held to ±0.05 mm. Melt temperature is maintained at 215 °C to 230 °C with a barrier screw at 24:1 L/D. The extrusion line uses a vacuum sizer and a laser wall monitor. Wall thickness variation above 0.05 mm causes uneven braid load distribution and reduces impulse life in production-scale bends. After liner extrusion, the core is cooled to 40 °C before braiding to prevent deformation under high tension.
Compliance is verified under SAE J517 for hydraulic hose and ISO 3949 for thermoplastic hoses. The terminal products are hydraulic control umbilicals, chemical injection lines, and gas lift control hoses. For methanol continuous injection, liner compatibility is evaluated by volume swell measured according to ISO 1817. The primary process conflict is the relationship between liner stiffness and braid coverage: when plasticizer content shifts the liner hardness below the lower limit, braid wires embed too deeply and the hose fails burst pressure testing. Published data for this specific grade in pure methanol at temperatures above 50 °C is limited, and qualification must include a project-specific aged burst program.
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Evonik VESTAMID® LX9012 T8 Nylon 12 is a semi-flexible polyamide 12 (PA12) extrusion and injection moulding compound supplied by Evonik Operations GmbH. The grade is considered a modified, heat-stabilised member of the VESTAMID PA12 product family; it is distinguished from unmodified PA12 by a lower tensile and flexural modulus, higher compliance, and retention of the low water absorption and hydrocarbon resistance associated with the long methylene sequence of PA12. The material is typically supplied as granules. The T8 suffix is an internal Evonik designation for the specific modification, colour, or viscosity package; it does not denote a generic PA12 polymerisation method. Principal application areas include thin-wall tubing, cable conduits, corrugated protective hose, pneumatic control line, spiral wrap, fasteners, and clips where repeated flexing is more important than maximum tensile stiffness. The datasheet references ISO 1133-1:2022 for melt volume-flow rate, ISO 1183-1:2019 for density, ISO 527-1:2019 for tensile properties, ISO 178:2019 for flexural modulus, ISO 179-1:2010 for Charpy impact strength, ISO 306:2022 for Vicat softening temperature, and ISO 7619-1:2019 for Shore hardness.
Unmodified PA12 extrusion grades typically exhibit dry tensile modulus values between 1,300 and 1,600 MPa under ISO 527-1:2019, while the semi-flexible modification in VESTAMID LX9012 T8 is reported to sit in the 350–700 MPa range depending on conditioning and lot. The reduction in modulus increases compliance in snap-fit arm retention and reduces hoop stress retention in pressurised tubular components. Substitution of the T8 grade into a design originally validated with unmodified PA12 therefore requires recalculation of creep deformation, buckling, and insertion force. Published data for this specific configuration is limited; part-level validation under ISO 899-1:2017 or ASTM D2990-17 is required. Hardness under ISO 7619-1:2019 is typically in the D50–D60 interval for the T8 grade, compared with D70–D75 for unmodified PA12. The lower hardness improves resistance to stress whitening during hinge flexure but can reduce the holding force of barbed fittings. Vicat softening temperature measured by method B50 is expected to be below that of unmodified PA12, so continuous exposure above 90–100 °C must be evaluated with ageing data rather than assumed from the melting point.
| Property | Test method | VESTAMID LX9012 T8 typical range | Unmodified PA12 typical range | TPU typical range |
|---|---|---|---|---|
| Density | ISO 1183-1:2019 | 1.03 g/cm³ | 1.01–1.04 g/cm³ | 1.12–1.25 g/cm³ |
| Tensile modulus | ISO 527-1:2019 | 350–700 MPa | 1,300–1,600 MPa | 10–100 MPa |
| Nominal strain at break | ISO 527-1:2019 | >300 % | >200 % | >300 % |
| Shore hardness | ISO 7619-1:2019 | D50–D60 | D70–D75 | A80–D60 |
| Water absorption at saturation | ISO 62-1:2008 | 1.0–1.5 % | 1.0–1.5 % | 0.2–2.0 % |
| Vicat softening temperature B50 | ISO 306:2022 | 120–140 °C | 165–175 °C | 60–100 °C |
The table presents class-typical ranges from publicly available polyamide and polyurethane technical literature; lot-specific certificates from Evonik control actual product values.
Production-scale processing of VESTAMID LX9012 T8 requires closed-loop control of moisture, melt residence time, and shear heating. Although PA12 absorbs less water than PA6 and PA66, granules from opened packaging stored above 60 % relative humidity require desiccant drying at 80–85 °C for 4–8 h to achieve a residual moisture level below 0.1 %; the drying hopper dew point should be -30 °C or lower. During profile or tube extrusion, single-screw extruders with screw L/D of 20:1 to 25:1 are common. Barrel settings from feed to metering are typically 200–225 °C, with die temperature 215–230 °C. Melt temperature above 250 °C is not recommended because the flexible modifier package can volatilise or degrade, producing surface roughness, odour, and loss of elongation at break. Injection moulding is conducted at melt temperatures of 220–250 °C and mould temperatures of 40–80 °C; total residence time at temperature should not exceed 10 min. On cold-runner tools, oversized sprue bushings and sharp flow transitions increase shear heating and can produce local degradation marks. Melt pump suction pressure below 80 bar and screen packs of 40/80 mesh are used on some production lines to stabilise output and trap contaminants, but site-specific validation is needed.
Polyamide 12 is specified in dynamic low-temperature applications because its long methylene sequence reduces amide concentration and limits equilibrium moisture uptake. Under ISO 62-1:2008, saturated water absorption at 23 °C is generally 1.0–1.5 % for PA12, compared with 6–10 % for PA6 and PA66. This lower absorption maintains dimensional stability in cable ducts exposed to humidity cycles and reduces the modulus shift between dry and conditioned states. For automotive fuel vapour or pneumatic lines, a multilayer construction may include a PA12 inner or outer layer, but the complete tube must be tested to the applicable vehicle specification, which often references SAE J2260, SAE J844, or regional ISO equivalents. The T8 grade is not a reinforced or highly conductive compound; electrostatic dissipative applications require separate evaluation because the base grade is likely in the low-conductivity range. Resistance to fuel and solvents is assessed by immersion under ASTM D543-21 or ISO 175:2010 using the specific fuel test liquid; published data for this specific configuration is limited.
Against glass-filled PA12 compounds, the T8 grade has much lower modulus and no fibre-related tool wear. Short-glass-fibre PA12 can reach tensile modulus from 5,000 MPa upwards under ISO 527-1:2019, but the fibre reinforcement reduces elongation and produces anisotropic shrinkage. The T8 grade retains un-reinforced high elongation and is better suited to thin-wall tube, spiral wrap, and flexible snap-fit geometry than to rigid brackets or housings. Compared with polyamide 11, the T8 grade offers similar moisture resistance but trades some stiffness for flexibility; PA11 and PA12 are both long-chain polyamides, but product selection should be based on the specific datasheet values for conditioned modulus and low-temperature Charpy impact. Compared with PA612, the T8 grade typically processes at lower melt temperature and has lower thermal resistance. Compared with thermoplastic polyurethane, the T8 compound exhibits better hydrocarbon resistance and higher hardness but lower elastic recovery after cyclic strain and higher melt viscosity. PEBA grades from the VESTAMID E range provide true elastomeric recovery at lower Shore D; the LX9012 T8 remains a semi-flexible structural PA12 rather than a soft elastomer.
On production single-screw lines processing semicrystalline PA12 with flexible modifiers, two recurring failure modes are observed. First, melt fracture at the die lip occurs when the melt temperature is below 210 °C or when the screen pack is partially blinded; the extrudate surface shows regular sharkskin or herringbone patterns. Increasing die temperature to 225–230 °C and shortening the die land length can eliminate the defect without changing the barrel profile. Second, phase separation or surface haze may appear if screw shear is too high or if residence time exceeds 10 min. The corrective action is to reduce screw speed, lower back pressure, and confirm that the screw geometry contains no high-shear mixing elements generating melt temperatures above 250 °C. Physical evidence from failed production trials shows that melt-temperature spikes, not barrel setpoints, correlate with brown streaks and loss of dart impact strength in thin-wall tube.
Datasheet values for VESTAMID LX9012 T8 are generated on dry-as-moulded or conditioned test specimens; the distinction matters because PA12 softens and increases in toughness with absorbed water. Tensile modulus is measured under ISO 527-1:2019 at a test speed of 1 mm/min for the modulus region, while Charpy notched impact strength is measured under ISO 179-1:2010 using type 1A specimens. The melt volume-flow rate for the T8 grade is commonly reported near 8 cm³/10 min at 235 °C and 5 kg load under ISO 1133-1:2022. This medium-flow rheology supports profile and tube extrusion but may limit moulding of walls below 1 mm when flow length is high. The crystalline melting point of PA12 is approximately 174–178 °C under ISO 11357-3:2018, lower than PA11 and PA6, which contributes to a broad processing window relative to higher-melting polyamides. Incoming quality control should include melt volume-flow rate, dry tensile modulus, and Shore D; density and ash content may detect plasticizer or filler variation. Ash content is determined by ISO 3451-1:2019. If the part is exposed to moisture, condition specimens to equilibrium at 50 % RH or use accelerated moisture conditioning before final mechanical approval.
For regulated applications, the T8 formulation contains heat stabilisers and a flexible modification package; verification of food-contact or medical suitability requires the current Evonik statement. Polyamide 12 grades may be referenced under FDA 21 CFR 177.1500 for nylon resins, but each formulation must be assessed for migration under EU 10/2011 when used in food-contact articles. Under REACH and RoHS 2011/65/EU, producers must obtain the current safety data sheet and product declaration for the exact grade and colour. The material is incompatible with strong oxidising acids, phenols, zinc chloride solutions, and certain amine-based concentrates; prolonged contact with automotive coolant formulations above 100 °C may hydrolyse the amide bond. Do not predry in open trays at high temperature or use excessive regrind above 30 % without process revalidation.
When the T8 grade is extruded into corrugated conduit with an outer diameter of 10–25 mm, die draw-down and vacuum calibration must be matched to the low modulus. Excessive draw-down introduces axial orientation and can cause splitting at bending radii below 3 times the outer diameter. Cooling water temperatures of 15–25 °C are common. The final product should be tested for ring stiffness, impact resistance at -30 °C, and dimensional recovery after heat ageing; published data for this specific configuration is limited, so line-specific capability studies are required.
