| HS Code | 476158 |
| Material | Evonik Vestamid L-R7-MHI |
| Type | Polyamide 12 (Nylon 12) |
| Color | Black |
| Electrically Conductive | Yes |
| Antistatic | Yes |
| Density | 1.07 g/cm³ |
| Melting Point | 178 °C |
| Surface Resistivity | 1 x 10^6 ohm/sq |
| Tensile Modulus | 2200 MPa |
| Elongation At Break | 20% |
As an accredited Evonik Vestamid L-R7-MHI Antistatic, Black, Electrically Conductive Nylon 12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg sealed multi-layer polyethylene-lined bags, moisture-protected for safe handling and storage of this antistatic conductive nylon. |
| Container Loading (20′ FCL) | 20′ FCL loaded with palletized, antistatic conductive nylon 12 granules; secure, ventilated, labeled, moisture-protected for safe transport. |
| Shipping | Ship as non-hazardous polymer resin. Protect from moisture and contamination. Use anti-static packaging to prevent electrostatic discharge. Store in sealed containers away from heat, sparks, and ignition sources. Comply with standard industrial transportation regulations. No special hazardous material declarations required. Ensure proper labeling to avoid static build-up during transit. |
| Storage | Store Evonik Vestamid L-R7-MHI in its original, sealed container in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and moisture. Keep container tightly closed when not in use. Avoid exposure to high humidity to prevent moisture pickup. Under recommended conditions, shelf life is typically two years from date of manufacture. |
| Shelf Life | Store in original sealed packaging, cool and dry. Shelf life is typically two years from date of manufacture. |
During coextrusion of multi-layer automotive fuel vapor tube stock, the inner layer produced from Evonik Vestamid L-R7-MHI Antistatic, Black, Electrically Conductive Nylon 12 is exposed directly to gasoline, ethanol-blended fuel, and condensate. The conductive carbon-black network is required to maintain a surface resistance below 106 Ω under the static dissipation provisions of SAE J2260 and related OEM fuel system specifications. At the die, melt temperature is held between 230 °C and 250 °C; the die gap is set to produce an inner layer thickness of 0.10 mm to 0.30 mm over an EVOH barrier layer. Because the conductive filler raises melt viscosity relative to unfilled PA12, die head pressure is 15–25% higher at the same mass throughput. A 30:1 L/D single-screw extruder with a conventional three-zone screw and a compression ratio of 2.5:1 is run at 40–60 rpm; higher screw speeds generate shear heating that can push the melt beyond 260 °C, after which the carbon-black agglomerates are dispersed too finely and the surface resistance can rise by one to two orders of magnitude. Melt filtration is limited to 60 µm woven screen packs. Finer screens of 45 µm are avoided because pressure drop across the screen pack increases rapidly after 4–6 h of continuous running and the conductive network can be mechanically separated at the filter. Pre-drying is mandatory at 80 °C for 4–6 h in a desiccant dryer with a dew point below -40 °C; moisture above 0.10 wt% hydrolyzes the polyamide backbone during plastication and shifts volume resistivity upward because chain scission reduces the matrix molecular weight that fixes the carbon-black network in place. If moisture is not removed, steam bubbles can form at the tie-layer interface with adjacent maleic anhydride-grafted polyolefin layers, causing delamination and localized loss of the ground path. Batch-to-batch variation in filler dispersion is controlled before extrusion by melt volume-flow rate measurement at 235 °C and 5 kg according to ISO 1133-1:2022; a shift of more than 15% from the reference lot triggers re-qualification of the line.
Injection-molded quick connectors and fuel tank valves from the same grade exhibit a different process boundary. The gate location must be placed so that the melt front converges at a bulk zone, because weld lines in carbon-black-filled PA12 do not fully re-establish the conductive network after the melt fronts meet. Tool temperatures of 40 °C to 80 °C are used, with the upper value preferred where thin walls of 1.5 mm or less are specified. At the knit line, surface resistance measured according to ASTM D257-14(2021) can be 102–103 Ω higher than the bulk value if the mold temperature is too low or the fill speed is excessive. Process validation therefore includes not only bulk resistance measurement but also a weld-line resistance mapping protocol after conditioned storage for 48 h at 23 °C and 50% RH. The use of multiple gates or a tab gate can shift the weld line to a non-functional section, but this increases scrap rate. Published data for the specific knit-line resistance of this grade in SAE J2260 validation is limited; single-end resistance checks on finished quick connectors should therefore be paired with fuel immersion aging at 60 °C for 1,000 h under OEM-specific surrogate fuel blends rather than relying on initial as-molded readings.
Liquid solvent transfer in chemical production environments generates streaming currents at the inner wall of non-conducting hose liners; when this static charge cannot decay to earth, discharges can ignite vapor-air mixtures in the presence of ketones, esters, or aromatics. A conductive PA12 liner extruded from Vestamid L-R7-MHI is used where chemical resistance to aliphatic hydrocarbons, aromatic hydrocarbons, and common oxygenated solvents is required and where continuous grounding continuity must be documented under the explosion protection requirements of Directive 2014/34/EU and IEC TS 60079-32-1. The liner is extruded at a wall thickness of 0.5 mm to 1.0 mm over a thermoplastic elastomer or fiber-reinforced hose body; the inner surface resistance after extrusion must not exceed 106 Ω measured between two electrodes spaced 100 mm apart along the hose length. Grounding continuity is provided by metallic end fittings that contact the conductive liner; the assembly resistance from the inner surface to the fitting is verified at 104 Ω or less per the end-user’s electrostatic discharge control plan. For non-polar solvents with conductivity below 50 pS/m, transfer velocity is limited to 1 m/s unless additional static dissipative measures are present. During hose corrugation, localized stretching can thin the liner below 0.20 mm; if the surface resistance in the thinnest corrugation root rises above 108 Ω, the entire hose length is rejected because charge decay time exceeds the 0.01 s threshold common for solvent filling operations. Nylon 12 provides good resistance to toluene and xylene, but strong acids, phenols, and concentrated formic acid cause irreversible degradation; therefore the liner is excluded from those services. Swelling in methanol is measurable but moderate; hoses used with methanol blends should be derated in pressure by 15–20% until long-term compatibility data for the specific blend is available.
In pneumatic conveying circuits handling organic powders, starch, or fine pharmaceutical intermediates, the inner wall of a conductive PA12 pipe made from Vestamid L-R7-MHI is connected to earth at intervals not exceeding 10 m. The danger scenario is not the pipe wall itself but the electrostatic charge carried by the conveyed dust cloud; a non-conducting or poorly grounded pipe permits charge to accumulate until a brush discharge ignites a dust cloud with a minimum ignition energy below 1–3 mJ for many fine organic powders. Installed systems are evaluated under NFPA 77 and EN 60079-10-1. The conductive PA12 pipe maintains surface resistance below 106 Ω when tested after conditioning at 23 °C and 50% RH according to IEC 60093; however, the measured value at low relative humidity can increase by up to half an order of magnitude because the carbon-black network is less hydrated. Therefore, acceptance testing for pneumatic conveying installations is performed at the lowest process relative humidity, typically 10–20% RH, not at standard laboratory conditions. Extruded pipe sections are joined with conductive fittings, and the joint resistance across a coupling must remain below 104 Ω after assembly. Conveying velocity is held above the saltation limit but below 20 m/s to reduce impact charging at elbows. The inner surface roughness of carbon-filled PA12 is higher than that of stainless steel; if hygroscopic powders are conveyed, moisture adsorption can create sticky films that alter surface resistance. In such circumstances, the pipe should be disassembled and rinsed with deionized water, then dried at 60 °C for 2 h before resistance re-qualification. The operating temperature for this grade in powder conveying is limited to -40 °C on the low end to avoid brittle fracture from impact at elbows and to 80 °C on the high end under continuous load; short-term spikes to 100 °C are permissible only if the pressure rating is reduced.
Static dissipative fixture bodies and tote walls for electronics assembly are injection molded from the conductive PA12 grade; the critical process variable is the hot runner system. In a 2-cavity mold fed by a manifold with 6 mm diameter channels, the combination of high shear at the valve gate and long residence time in the manifold can destroy the carbon-black network before it reaches the cavity. The as-molded surface resistance is then not controlled by the nominal filler loading but by the local shear history. Molders therefore limit hot runner temperature to 250–270 °C, reduce injection speed to a fill time of 1.5–2.5 s, and avoid gate diameters below 0.8 mm. Clamp force is set to prevent mold breathing above 0.05 mm; vents are cut to 0.02 mm because carbon-filled PA12 releases volatiles at high temperature. Parts intended for use in ESD-protected areas under ANSI/ESD S20.20 are measured after 48 h at 12% RH; surface resistivity must fall within the static dissipative range of 104 Ω to 1011 Ω, although the conductive PA12 compound typically sits below 106 Ω. The limitation for cleanroom use is severe: carbon black particles can slough from the surface during abrasion, rendering the material unsuitable for ISO Class 4 or better semiconductor cleanrooms without external sealing or coating. For assembly cells with localized extraction and wipe-down protocols, the parts are cleaned with 70% isopropyl alcohol and deionized water; conductive properties recover after drying at 60 °C for 30 min.
| Application segment | Governing standard or regulation | Measured property | Acceptance criterion |
|---|---|---|---|
| Automotive fuel vapor tubing | SAE J2260, OEM fuel system specifications | Surface resistance after thermal aging | <106 Ω per ASTM D257-14(2021) |
| Solvent transfer hose liners | Directive 2014/34/EU, IEC TS 60079-32-1 | Inner wall surface resistance | <106 Ω per IEC 60093 |
| Pneumatic powder conveying | NFPA 77, EN 60079-10-1 | Charge decay path and joint resistance | 104–106 Ω |
| ESD electronics assembly | ANSI/ESD S20.20 | Surface resistivity | 104–1011 Ω per ASTM D257-14(2021) |
| Mining cable conduits | IEC 60079-0 | Surface resistance | <106 Ω for conductive grade |
| Air brake tubing | SAE J844 | Inner surface resistance | <106 Ω |
Underground cable protection conduits in coal mining are specified as antistatic when the conduit is installed inside ventilation entries where methane-air mixtures may be present. Conduit made from Vestamid L-R7-MHI is tested for surface resistance according to EN 60079-0 and related mine approval schemes; the acceptance value is normally below 109 Ω for antistatic plastic, but this grade is conductive and falls below 106 Ω when conditioned at 23 °C and 50% RH. The installed conduit is grounded through metallic couplings at intervals not exceeding 20 m. Impact strength at low temperature is relevant because mine air can drop to -20 °C; PA12 retains better ductility than PA6 at low temperature. However, the carbon-black filler reduces notched Charpy impact relative to unmodified PA12; conduit installers must avoid sharp bending below 0 °C unless the minimum bend radius specified by the manufacturer is observed. The material is not rated for direct flame exposure and must be protected from welding spatter; long-term exposure to UV in surface installations requires an overjacket, although the black filler package provides partial stabilization.
In commercial vehicle air brake systems, the compressed air stream carries oil mist, water, and solid particles; static charge can accumulate on the inner wall of nylon brake tubing if the material is non-conducting. SAE J844 specifies performance for nylon air brake tubing; conductive PA12 tube stock from Vestamid L-R7-MHI is applied where OEM specifications call for antistatic or static dissipative inner surfaces. The inner surface resistance is measured after 24 h conditioning at 23 °C and 50% RH; values above 106 Ω are not accepted. During extrusion, the tube is quenched in a water bath at 40 °C; rapid cooling freezes the carbon-black network in the as-extruded state, but post-extrusion annealing at 80 °C for 2 h may be required to stabilize dimensions. Burst pressure at 23 °C for 12.7 mm OD by 1.5 mm wall tube is verified according to SAE J844; conductive filler slightly reduces tensile elongation, so the tube is not expanded beyond specified bend radius. Because the tube ends are connected with push-to-connect fittings, the bite of the metallic collet must penetrate the outer surface and contact the conductive core; if only the outer skin is conductive, assembly resistance can be too high. Therefore, tube is extruded as a monolayer with homogeneous conductivity through the wall, not as a coextruded conductive skin.
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Evonik Vestamid L-R7-MHI Antistatic, Black, Electrically Conductive Nylon 12 is a heat-stabilized, plasticized polyamide 12 compound loaded with conductive carbon black to form a percolation network for static dissipation. The product is supplied as black granules and is intended principally for extrusion into conductive tubing, profiles, and vapor-management lines; injection molding is possible but requires exacting thermal control. The grade combines the low moisture absorption and low-temperature flexibility of semicrystalline nylon 12 with a surface resistivity envelope below 106 Ω/sq when tested in accordance with IEC 60093:2010. The nylon 12 repeat unit contains an amide group separated by an eleven-carbon aliphatic segment, giving lower amide density than PA6 or PA66 and therefore lower equilibrium water uptake under humid conditions.
Electrical characterization of the conductive network should be performed on dry-as-molded specimens after conditioning at 23 °C and 50 % relative humidity for 24 h. Under these conditions, supplier data typically place surface resistivity between 104 Ω/sq and 106 Ω/sq. Volume resistivity follows a nonlinear relation through the part wall and becomes anisotropic under high shear. Measurements on injection-molded plaques can overstate end-use conductivity relative to extruded tubing because the carbon black network is partially oriented during melt flow. Charge decay time constants per IEC 61340-2-3:2016 are therefore more meaningful for a finished fuel vapor tube than coupon values alone. Carbon black-filled polyamide conductivity is generally less humidity-dependent than that of migratory antistatic compounds, but low-humidity verification at 12 % RH is still required for critical applications.
The addition of conductive carbon black at a loading sufficient for static dissipation increases melt viscosity and reduces weld-line strength relative to unfilled plasticized PA12. Tensile modulus and elongation at break decline as the filler volume fraction rises, while low-temperature ductility is retained only when the matrix is properly plasticized. The following table summarizes the typical property envelope reported for this compound.
| Property | Test method | Typical supplier-reported range |
| Density | ISO 1183-1:2019 | 1.04–1.06 g/cm³ |
| Melt volume rate | ISO 1133-1:2022 at 235 °C/5 kg | 8–15 cm³/10 min |
| Tensile modulus | ISO 527-1/-2 | 200–250 MPa |
| Tensile stress at yield | ISO 527-1/-2 | 17–20 MPa |
| Charpy notched impact at −30 °C | ISO 179-1/1eA | 6–12 kJ/m² |
| Surface resistivity | IEC 60093:2010 | 104–106 Ω/sq |
| DSC melt peak | ISO 11357-3 | 166–172 °C |
| DSC crystallization peak | ISO 11357-3 | 152–158 °C |
These values describe dry-as-molded specimens. Moisture absorption in nylon 12 at 23 °C/50 % RH is commonly 0.7 % by mass per ISO 62:2008; this level produces a measurable but non-catastrophic shift in surface resistivity and impact behavior. For applications requiring dimensional stability under wet-dry cycling, nylon 12 generally exhibits lower equilibrium water uptake than conductive PA6, which can exceed 2.5 % under identical conditions. Elongation at break for dry-as-molded specimens is generally above 200 % per ISO 527-1/-2. However, the carbon black phase creates notch sensitivity in thick sections and under triaxial loading. In extruded tubing, burst strength at 23 °C and 60 °C is commonly measured per ISO 1167 or ASTM D1599; supplier data for this conductive compound under internal hydrostatic pressure is limited, so end-use burst qualification should be performed on the finished tube geometry.
Pre-drying is mandatory for this grade. Residual moisture above 0.10 % can hydrolyze the polyamide backbone during extrusion, producing viscosity loss, surface splay, and reduced burst strength. Desiccant drying at 80 °C for 4–6 h with a dew point of −40 °C or lower is typical. If a container remains opened at >60 % RH for more than 4 h, redrying is required. Drying above 80 °C for more than 12 h should be avoided because thermo-oxidative degradation of carbon black-filled PA12 can increase melt viscosity and consume the heat stabilizer.
On single-screw extruders with 24:1–30:1 L/D and three-zone mixing screws, barrel settings are usually 210–250 °C from hopper to die. The carbon black filler generates viscous dissipation; actual melt temperature can exceed the rear-zone setpoint by 10–15 °C when screw speed exceeds 80 rpm. Melt temperatures above 260 °C accelerate thermo-oxidative degradation of the carbon black dispersion and should be avoided through screw-speed reduction or barrel-profile adjustment. Static mixers and melt pumps are recommended for stable gauge control in conductive tubing because the compound has a stronger shear-thinning response than nonconductive PA12. Residence time should be kept below 10 min, and production interruptions longer than 15 min should trigger a purge with a high-viscosity polyolefin or commercial PA purge grade. Copper-based stabilizers or copper-containing screen packs should not be used in contact with the melt; published data for this specific configuration is limited, but residual copper ions can accelerate polyamide degradation at elevated temperatures.
Downstream of the die, calibration and cooling require special attention because the conductive carbon black reduces infrared transmission, making wall-thickness measurement by optical sensors less reliable. Ultrasonic or contact gauges are preferred. Vacuum calibration tanks with water below 40 °C are typical. High quench rates reduce crystallinity and can improve apparent weld-joint ductility, but they may also freeze in surface stresses in thick profiles. Cooling water pH should be maintained between 6.5 and 8.5 to avoid surface hydrolysis on the hot tube. Haul-off speed must be synchronized with melt-pump output; variation above ±1 % at the nip can alter the conductive network orientation and produce longitudinal surface-resistivity drift.
When injection molding end fittings, use melt temperatures of 220–250 °C, mold temperatures of 40–80 °C, and fill speeds that avoid shear rates above 10,000 s–1 at the gate. Weld lines in conductive carbon black compounds exhibit lower tensile strength than weld lines in unmodified PA12. Gates should be positioned so that weld lines do not fall within sealing ridges, barbs, or torsional load paths. In thin-walled sections below 1.5 mm, conductivity may be less uniform because of rapid quench and filler orientation; end-use resistivity mapping is required before production release.
In fuel vapor return hardware and tank vent lines, the material is employed where surface resistivity below 106 Ω/sq prevents charge accumulation during fuel flow through nonconductive polymer plumbing. Low-temperature impact strength is a primary design parameter; automotive specifications often require Charpy notched impact above 6 kJ/m² at −30 °C per ISO 179-1/1eA, which the grade satisfies in dry-as-molded condition. Compatibility testing with CE10, E85, and aggressive aromatic fuel blends is mandatory. Published data for this conductive grade after continuous exposure to E85 at 60 °C for 1,000 h is limited; end-use qualification must include permeation, tensile retention, and surface resistivity after fuel immersion. Pneumatic conveying lines in dusty environments and cable protection conduits in semiconductor fabrication also use the grade because the carbon black network does not rely on moisture to maintain dissipation. In electrostatic discharge protected areas, the conductive PA12 tube should be grounded through metallic connectors at intervals not exceeding 10 m; grounding clamps must penetrate the carbon black surface rather than rely on surface contact alone because extruded tube surface resistivity can vary by one order of magnitude over a production run.
Compared with an impact-modified conductive PA6, the nylon 12 matrix provides lower equilibrium moisture uptake, better retention of impact strength at low temperature, and lower density. The tradeoff is a lower tensile modulus and a higher price per kilogram. Conductive PA6 compounds commonly exhibit tensile modulus values above 2,000 MPa dry-as-molded, whereas this plasticized conductive PA12 remains below 250 MPa. That difference matters in snap-fit designs that rely on stiffness rather than compliance. The lower modulus of the plasticized conductive PA12 is advantageous in push-to-connect fittings and barbed connections because the tube can deform elastically to create a seal without stress whitening. Rigid conductive PA6 systems can produce insertion force spikes and microcracking at low temperature. The nylon 12 grade also offers better resistance to zinc chloride solutions used in automotive environments, a known stress-cracking agent for PA6.
Relative to carbon-fiber-filled conductive PA12, the carbon black grade gives more uniform surface conductivity, lower anisotropy, higher elongation, and smoother extrudate finish, but cannot match the flexural modulus of carbon-fiber-reinforced variants. Relative to permanent antistatic polyolefin compounds, the nylon 12 grade offers higher continuous-use temperature under the automotive hood, better fuel and oil resistance, and lower permeability to hydrocarbon vapors; the polyolefin alternative can be lower in density and easier to weld with hot-plate methods. Compared with nonconductive plasticized Vestamid PA12 extrusion grades, L-R7-MHI carries higher melt viscosity, reduced weld-line integrity, and a black color that cannot be altered by masterbatch dilution.
Compliance documentation for this product commonly references the following standards and directives. The table is not an exhaustive regulatory statement; it defines the verification points used in technical part release.
| Compliance area | Standard or directive | Technical condition |
| Surface resistivity | IEC 60093:2010 | ≤106 Ω/sq at 23 °C/50 % RH |
| Charge dissipation | IEC 61340-2-3:2016 | Charge decay time evaluated on finished part, not resin pellet |
| REACH SVHC | Regulation (EC) No 1907/2006, Article 33 | Supplier confirmation of no reserved SVHC above 0.1 % w/w per article |
| RoHS | Directive 2011/65/EU, Annex II | Supplier analytical declaration for Pb, Hg, Cd, Cr(VI), PBB, PBDE |
| Melt volume rate | ISO 1133-1:2022 | 8–15 cm³/10 min at 235 °C/5 kg |
| Density | ISO 1183-1:2019 | 1.04–1.06 g/cm³ |
This compound is not intended for direct food-contact applications, potable water pressure pipes, or continuous immersion in strong mineral acids, polar solvents, or boiling water. It should not be compounded with amine-based additives that can react with the conductive carbon black surface and shift percolation thresholds. For cleanroom applications, carbon black surface abrasion can generate particles; when particulate cleanliness is critical, purge and finishing protocols must be validated on the specific production line. Regrind use above 20 % is not recommended unless lot-to-lot surface resistivity and impact retention data support a higher recycle ratio for the specific profile or tube geometry.
