| HS Code | 164967 |
| Density | 1.08 g/cm³ |
| Viscosity | High viscosity |
| Meltingpoint | 178 °C |
| Tensilestrength | 40 MPa |
| Elongationatbreak | 200% |
| Flexuralmodulus | 1200 MPa |
| Charpyimpactstrength | 12 kJ/m² |
| Heatdeflectiontemperature | 50 °C at 1.8 MPa |
| Thermalconductivity | 0.5 W/(m·K) |
| Waterabsorption | 0.5% at saturation |
As an accredited Evonik Vestamid X7163 High Viscosity, Heat Stabilized, Graphite Filled Nylon 12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Evonik Vestamid X7163 high viscosity, heat stabilized, graphite filled nylon 12 supplied in 25 kg sealed bags. |
| Container Loading (20′ FCL) | 20′ FCL of Evonik Vestamid X7163 nylon 12, high viscosity, heat stabilized, graphite filled, packed in bags on pallets, ready for shipment. |
| Shipping | Evonik Vestamid X7163 ships as a non-hazardous granular nylon 12 resin. It should remain sealed in original moisture-resistant packaging, stored cool and dry, and protected from prolonged heat or humidity. Standard ground freight is suitable; no special hazmat designation applies, though proper labeling and secure palletization are recommended. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and ignition hazards. Keep the original container tightly closed when not in use to prevent moisture absorption and contamination. Avoid dust accumulation; use grounded equipment. Ensure segregation from oxidizing agents and foodstuffs. Follow local regulations. |
| Shelf Life | Shelf life is typically two years from shipment if stored unopened, in original packaging, in a cool, dry environment. |
Multilayer coextruded diesel fuel feed, return, and vapor tubing in commercial vehicles places a graphite-filled static-dissipative polyamide 12 at the lumen. In service, low-conductivity hydrocarbons moving at flow velocities above 2 m/s generate triboelectric charge that cannot safely migrate through an unfilled nylon 12 wall. Vestamid X7163 is supplied with the graphite content fixed at the compounding stage; converters do not let the inner-layer formulation down with non-conductive PA12 because even minor dilution destroys the filler percolation network and shifts surface resistivity upward by decades. In one validated five-layer configuration, the inner conductive layer comprises 10–15 wt% of total wall mass, adjacent tie layers 5–8 wt% each, an EVOH barrier layer 2–3 wt%, and the outer PA12 layer 70–80 wt%. Edge-trim regrind is restricted to the outer layer at no more than 20 wt%. The compliance framework is defined by SAE J2260 for non-metallic fuel-system tubing and SAE J1645 for fuel and vapor system components; surface resistance is typically measured according to ASTM D257-14 with an acceptance ceiling of 106 Ω between the inner surface and a defined earth point. Moisture uptake in the crystalline PA12 matrix remains below 0.1 wt% at 23 °C/50% RH; before processing, pellets are dried at 80 °C for 4–6 h to a residual moisture level no greater than 0.1 wt%. Coextrusion is performed on separate single-screw extruders with barrier screws and melt pumps, maintaining individual melt temperatures between 230 °C and 245 °C and a maximum melt residence time of 10 min; thermal degradation above 260 °C produces surface defects at the die. Vacuum sizing and post-extrusion annealing at 120 °C for 2 h stabilize inner-layer concentricity. Terminal finished products include diesel fuel feed lines, fuel return lines, vapor management lines, and quick-connector liners for heavy-duty and commercial vehicle powertrains.
| Requirement | Standard / test method | Measurement condition | Acceptance criterion |
|---|---|---|---|
| Surface resistance | ASTM D257-14 | 23 °C / 50% RH | ≤106 Ω |
| Melt volume-flow rate | ISO 1133-1:2022 | 275 °C / 5 kg | Grade nominal |
| Tensile stress at yield | ISO 527-2 | 50 mm/min | Grade nominal |
| Fuel permeation | SAE J2260 | CE10 / 60 °C | OEM-specific |
In flexible powder transfer operations, a non-conductive polyolefin or rubber liner can accumulate surface potentials above 10 kV during pneumatic conveying of mineral fillers, cement, or powder coatings; the resulting brush discharge is a recognized ignition source under ATEX 2014/34/EU. A graphite-filled PA12 liner with an end-to-end electrical resistance between 103 Ω and 106 Ω provides controlled charge bleed without creating the rapid discharge risk of a highly conductive metal liner. The relevant test method is ISO 8031:2020, which measures the resistance of rubber and plastics hoses; equipment-level certification is assessed under IEC 60079-0:2017. The compound is used as supplied without further graphite masterbatch addition: graphite acts as the primary conductive filler, and any dry-blended processing aids should remain below 1 wt% relative to total compound mass to avoid disrupting filler continuity. The liner is produced by single-screw extrusion at melt temperatures of 230–250 °C, followed by vacuum calibration to a wall-tolerance band of ±0.05 mm for thin-walled liners. After extrusion, the liner is assembled into a hose with an embedded static-dissipative layer and metallic grounding fittings; the resistance between fitting and liner must be rechecked after each cutting operation. Terminal finished products include bulk-transfer hoses for powder coatings, mineral fillers, cement, and chemical powders in hazardous-area process plants. Operational boundaries include avoiding continuous exposure to strong acids or phenols above 60 °C, which can plasticize the PA12 matrix and reduce liner collapse resistance.
During start-stop operation of linear motion equipment, sliding pads made from unfilled nylon 12 can transfer a polymer film to hardened steel guide rails, producing stick-slip and audible noise at breakaway. In a graphite-filled, high-viscosity PA12 grade, the graphite filler forms a solid lubricant reservoir that lowers the coefficient of friction and reduces counterface transfer under dry sliding. The compound is injection-moulded without further addition of graphite or PTFE; adding glass fiber is strongly discouraged for this application because glass protrusions abrade the hardened counterface and raise system friction. Compliance is determined on cylindrical or thrust-washer test rigs according to ISO 7148-1:2012 and ASTM D3702; because published tribological data for this exact grade are limited, each converter must generate component-level PV charts using the production tool surface finish. Melt temperature during moulding is maintained at 240–260 °C, mould temperature at 60–80 °C, and holding pressure between 60 MPa and 80 MPa; a screw with a low-shear mixing section is preferred to avoid degrading graphite platelets. After ejection, parts are conditioned at 23 °C/50% RH for at least 24 h before friction testing because PA12 surface hardness and modulus are moisture-sensitive below the glass transition. Terminal finished products include chain-guide blocks, cam followers, valve-actuator sliding nuts, conveyor bearing cages, and rail-guide pads for packaging and assembly machinery. The operational boundary is set by surface temperature: continuous dry sliding above 120 °C shortens the oxidation induction period despite heat stabilization.
Offshore umbilical components combine steel wire armor, extruded thermoplastic inner sheaths, and dynamic bending loads that cause fretting at interlayer contacts. A graphite-filled high-viscosity PA12 is specified in interlayer applications where a controlled reduction in friction prevents local abrasion and where any generated debris must not accumulate static charge. The applicable compliance documents are API 17J:2014 for unbonded flexible pipe and ISO 13628-2:2021 for subsea unbonded flexible pipe systems; qualification is project-specific and includes long-term seawater aging, methanol exposure, and dynamic bending fatigue. The compound is processed neat, without external plasticizer or viscosity modifier, because the high-viscosity base polymer provides adequate extrudate integrity for thick-wall sheathing. If regrind is used in the jacket layer, no more than 10 wt% is accepted because dynamic fatigue crack growth is sensitive to regrind-induced gel particles. Extrusion is conducted on a grooved-barrel single-screw extruder at melt temperatures of 230–240 °C; wall thickness may reach 5–12 mm, requiring slow vacuum sizing and post-extrusion annealing to reduce residual stress and anisotropic shrinkage. Published data for this exact graphite-filled grade in subsea service are limited; therefore, qualification programmes must include comparative testing against an unfilled PA12 sheathing material and component-level fatigue cycling. Terminal finished products include anti-wear interlayers in dynamic bend stiffeners, cable sheath spacers, and protective liners in subsea control and chemical injection bundles. The material is not recommended for continuous exposure to methanol at temperatures above 60 °C without stress-cracking evaluation.
For centrifugal pumps handling light hydrocarbons and process water, wear rings made from metallic materials are vulnerable to seizing when solids or start-up contact causes galling. A graphite-filled PA12 wear ring provides a lower-hardness sacrificial clearance component that limits recirculation loss and resists adhesive wear better than bronze or stainless steel in non-lubricated contact. The component is machined from extruded stock shape or injection-moulded near-net; no additional anti-wear filler is required because graphite is already dispersed at the primary compounding stage. Machining scrap is not reprocessed into wear-ring stock because milling changes the filler particle distribution and can reduce tensile elongation. Relevant standards include ISO 13709:2009 for centrifugal pumps in petroleum, petrochemical, and natural gas industries, and ISO 7148-1:2012 for bearing material qualification; hydraulic and mechanical acceptance values are specified by the pump OEM rather than by a generic material standard. Machining requires sharp carbide tooling and cutting speeds below 150 m/min to prevent surface smearing and built-up edge on the graphite-filled surface; injection moulding uses melt temperatures between 240 °C and 260 °C and mould temperatures of 60–80 °C. Terminal finished products are clearance bushes, casing wear rings, throat bushings, and step bearings in process pumps, chemical transfer pumps, and fuel-handling skids. The application limit is set by swell: aromatic solvents and oxygenated fuels above 80 °C can soften the PA12 matrix and reduce dimensional stability.
Cable conduits in off-highway machinery are exposed to sustained vibration, diesel spray, mineral oil mist, and ambient temperatures that can exceed 100 °C near the aftertreatment system. Graphite-filled PA12 with high viscosity is extruded into slit or unslit corrugated conduit, where the graphite phase provides low friction for cable pulling and a measurable static-dissipative path to the chassis. The compliance framework uses IEC 61386-1:2008 for conduit systems for cable management; cable-level requirements are referenced under ISO 6722-1 where vehicle road homologation applies. The compound enters the corrugator as supplied, with post-industrial regrind limited to 20 wt% and only from the same heat-stabilized graphite grade, because higher regrind levels reduce impact strength at corrugation hinges. Processing is by single-screw extrusion at 230–250 °C into a vacuum corrugator with mold blocks held at 80–100 °C; corrugator vacuum must remain below 0.09 MPa absolute to avoid wall-thinning at the corrugation peaks. Terminal finished products include engine-harness protective conduit, hydraulic-hose abrasion sleeves, and diesel-fuel line guard tubing in agricultural, construction, and mining equipment. The material is not intended for continuous service above 120 °C, and direct contact with zinc-rich coolant concentrates should be evaluated for environmental stress cracking.
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Evonik Vestamid X7163 is a high-viscosity, heat-stabilized, graphite-filled nylon 12 compound positioned for extrusion-dominated conversion where melt strength, thermal stability, and graphite-modified surface behavior are process-critical. The grade is not a general-purpose PA12 injection-molding resin. Typical application classes include cable protection ducts, pneumatic tubing, hydraulic hose jackets, sliding wear strips, mechanical guides, and thick-section extruded profiles. The product is supplied as black pelletized compound; pellet geometry and bulk density should be verified during incoming inspection because graphite-filled grades can bridge in volumetric feeders, particularly when ambient relative humidity exceeds 60 % RH. The graphite filler raises density above the 1.01 g/cm³ typical of unfilled PA12, but the supplier’s current datasheet value remains the binding specification. The product designation should not be interpreted as food-contact certification; the formulation must be checked against current REACH, RoHS, and FDA 21 CFR status before use in regulated contact or potable-water applications.
Compared with general-purpose nylon 12, the base polymer exhibits lower equilibrium moisture uptake than PA6 or PA66, typically below 1.5 wt% at 23 °C and 50 % RH. Graphite filler and heat stabilizer do not eliminate the need for melt drying. The practical result is a wider moisture window than PA6-based graphite-filled compounds but not an unlimited hydrolytic tolerance. The product specification is characterized by melt volume-flow rate determined under ISO 1133-1; because of the high molecular weight, the MVR is intentionally lower than that of graphite-filled PA12 injection-molding grades. Lot-to-lot MVR variation may be observed in the 5 %–15 % relative range in commercial compounding, and extrusion settings should be trimmed against measured MVR rather than against pellet color or surface gloss alone.
This distinction is primarily rheological and functional. Compared with a low-viscosity graphite-filled PA12 injection-molding grade, X7163 exhibits higher melt strength and greater die-swell stability, which assists in maintaining annular dimensions during vacuum calibration. The trade-off is reduced spiral-flow length and greater risk of short-shots in thin-wall molding. Low-viscosity graphite-filled PA12 grades may fill a 0.8 mm wall section with acceptable pressure; X7163 is generally confined to wall thicknesses above 2.5 mm because high melt viscosity creates high gate pressure. This is a consequence of molecular-weight distribution and filler-network formation rather than a specification defect. In comparison with unfilled high-viscosity PA12, the graphite filler in X7163 is expected to reduce surface resistivity, dependent on dispersion and part thickness. Unfilled PA12 typically exhibits surface resistivity above 1013 Ω/sq under IEC 60093; graphite-filled grades can enter the static-dissipative range of 106 Ω/sq to 109 Ω/sq, but the exact value for X7163 must be verified on the actual part because gate orientation and cooling rate affect filler-network formation. Published data for surface resistivity on complex molded X7163 geometries is limited and should be supplemented by end-use measurement.
Graphite modifies wear behavior; pin-on-disk testing under ASTM G133 is preferred to quantify coefficient of friction because material transfer to the counterface can create an apparent steady-state value that is not representative of end-use performance. The graphite phase also acts as a solid lubricant and can reduce stick-slip in sliding contact, but this does not imply structural lubrication under boundary conditions without a defined counterface and lubrication state. Tensile and flexural comparisons against unfilled PA12 should be made using dry-as-molded and conditioned specimens because absorbed moisture plasticizes polyamides and shifts modulus, yield stress, and impact response. Any comparative claim should therefore cite ISO 527-2 or ISO 178 with explicit specimen conditioning and test speed.
On a 30:1 L/D single-screw extruder equipped with a grooved feed section, a barrel profile from 220 °C at the feed throat to 245 °C at the adapter is a practical starting point. The die temperature should not exceed 250 °C for extended runs; melt temperatures above 260 °C can accelerate oxidative degradation even in the presence of heat stabilizer, producing black specks and melt-fracture-like surface defects. The use of a gear pump between the screw tip and die is recommended because the high melt viscosity creates substantial pressure fluctuations when screw speed changes. Pressure transducers with a full-scale range of 350 bar are appropriate for high-viscosity PA12; continuous operation above 250 bar is an equipment-stress condition that should trigger a reduction in screw speed or an increase in barrel temperature within the approved window. Rheological curves obtained by capillary rheometry at 230 °C and shear rates from 100 s⁻¹ to 1000 s⁻¹ are more useful than a single MVR point because graphite-filled PA12 can show shear-thinning behavior and wall slip at high shear rates.
Although X7163 can be injection molded in thick-section articles, tooling must be designed around the high-viscosity character. A 75 t clamp machine running a single-cavity tool may produce a 4 mm wear plate with a melt temperature of 235 °C and a mold temperature of 60 °C, but cycle time and screw recovery will be longer than for a lower-viscosity grade. Gates should be positioned to reduce flow length and weld lines; because graphite filler reduces weld-line strength compared with unfilled PA12, tensile tests on weld-line specimens under ISO 527-2 should be included in first-article qualification. Low-viscosity graphite-filled grades are often preferred for multi-cavity connectors; X7163 is more suitable for extruded tube, sleeve, and thick-section wear parts where dimensional stability in the melt state matters more than low-pressure mold filling.
Extrusion of X7163 through a pipe or profile die requires continuous monitoring of gear-pump suction pressure. Suction pressure should be maintained between 20 bar and 60 bar; if suction pressure falls below 10 bar, the pump cavitates and wear accelerates. Screen packs of 40/60/80 mesh can be used to protect the die, but graphite-filled grades may increase screen pressure more quickly than unfilled PA12. Pressure drop across a breaker plate should be logged during every shift. If the pressure differential rises by more than 25 % in 8 h without raw-material change, the screen pack should be replaced. For profile calibration, vacuum calibration tanks operating at -0.08 MPa to -0.03 MPa are standard; graphite-filled PA12 surfaces can show altered slip behavior in water contact, so calibrator inlet geometry may require additional wetting or a harder chrome-plated insert to avoid scuffing.
Although the product is heat-stabilized, the thermal stabilizer is an oxidation retarder, not a hydrolysis inhibitor. Residual moisture above 0.10 wt% in the melt can cause hydrolysis, lowering molecular weight and producing surface roughness and weld-line weakness. Drying in a desiccant dryer with dew point below -40 °C at 80 °C for 4 h to 8 h is standard for PA12; hoppers open to humid air should be avoided at relative humidity above 60 %. Karl Fischer titration with a headspace oven is the accepted method for confirming residual moisture, not loss-on-dryer weight. In plants where regrind is used, graphite-filled regrind should be dried separately and limited to 20 wt% to 30 wt% unless end-use physical testing confirms retention of tensile and impact properties. Black specks or droplets at the die exit often indicate hydrolytic degradation of the PA12 melt, not inadequate graphite dispersion; reducing melt temperature and verifying dryer performance should be the first corrective actions.
Melting behavior should be confirmed by differential scanning calorimetry under ISO 11357-3. A broad endotherm or double peak can indicate inadequate compounding, contamination, or excessive moisture retention. The PA12 matrix is semicrystalline, and the crystallinity developed during cooling affects dimensional stability, stiffness, and friction behavior. Controlled die-exit cooling is therefore as important as melt temperature control; rapid quenching reduces crystallinity and can shift wear and surface-resistivity outcomes relative to slow-cooled thick sections. This is especially relevant for extruded profiles with wall thickness varying from 2 mm to 8 mm because the thermal history may be nonuniform across the cross-section.
The following test methods provide a structured basis for incoming inspection, first-article qualification, and lot-to-lot comparison. The methods themselves do not constitute release limits; the supplier datasheet and end-user specification define acceptable ranges. Graphite-filled PA12 should be tested in both dry-as-molded and moisture-conditioned states where the standard permits, because polyamide properties are humidity-dependent.
| Property | Test method | Process relevance |
|---|---|---|
| Density | ISO 1183-1 | Indicates filler loading; graphite raises density relative to unfilled PA12. |
| Melt volume-flow rate | ISO 1133-1 | Confirms high-viscosity positioning; lower MVR than injection-molding grades. |
| Tensile modulus, yield stress, elongation at break | ISO 527-2 | Measures strength and stiffness; moisture conditioning shifts values. |
| Flexural modulus and strength | ISO 178 | Used for thick-section wear parts and structural profiles. |
| Charpy notched impact | ISO 179-1/1eA | Sensitive to filler orientation and weld-line position. |
| Heat deflection temperature | ISO 75-2 Method B | Indicative short-term thermal resistance under load. |
| Vicat softening temperature | ISO 306 Method B50 | Predicts onset of softening under heating. |
| Surface resistivity | IEC 60093 | Verifies graphite dispersion and part-to-part conductivity. |
| Coefficient of friction | ASTM G133 | Sliding wear comparisons require defined counterface and lubrication. |
| Melting temperature | ISO 11357-3 | Detects contamination, moisture, or compounding anomalies. |
A second operational matrix is required because dry-batch properties alone do not predict conversion stability. The following processing ranges are practical starting points; they are not release limits. They should be adjusted against actual screw geometry, screw speed, die pressure, and end-part requirements.
| Processing parameter | Practical range or condition | Instrument or control |
|---|---|---|
| Pre-drying temperature | 80 °C | Desiccant dryer |
| Pre-drying time | 4 h to 8 h | Closed hopper |
| Dew point | below -40 °C | Dew-point sensor |
| Residual moisture | below 0.10 wt% | Karl Fischer titration |
| Melt temperature | 220 °C to 250 °C | Immersion probe |
| Maximum melt temperature | 260 °C | Melt-pressure monitor |
| Single-screw L/D ratio | 25:1 to 32:1 | Barrier screw with grooved feed |
| Compression ratio | 2.5:1 to 3.5:1 | Extruder screw specification |
| Gear-pump suction pressure | 20 bar to 60 bar | Pressure transducer |
| Gear-pump discharge alarm | 250 bar to 350 bar | Pressure transducer |
| Mold temperature | 40 °C to 80 °C | Thermolator or oil heater |
| Regrind level | 20 wt% to 30 wt% | Gravimetric blender |
Chemical compatibility in service should not be extrapolated from unfilled PA12 without testing. The graphite filler can alter surface wetting, permeability, and stress-cracking response in oil, fuel vapor, and zinc chloride environments. Stress-cracking resistance can be evaluated using tensile bars under constant strain according to ISO 22088-3; for fuel-contact applications, the relevant permeation specification may be SAE J2260 or the end-user’s own permeation limit. The compound is not recommended for continuous exposure to strong mineral acids, phenol, or concentrated formic acid. At sustained hot-air temperatures above 120 °C, the thermal stabilizer reduces oxidation rate but does not prevent eventual embrittlement; heat-aging studies should therefore be carried out to ISO 188 on finished parts, not only on injection-molded plaques. Where the application demands a defined surface resistivity after installation, conditioning at the actual service temperature and humidity is necessary because moisture uptake can plasticize the surface and alter the graphite particle contact network.
