| HS Code | 121540 |
| Material | Vestamid L-R2-GF25 |
| Base Polymer | Nylon 12 (Polyamide 12) |
| Glass Fiber Content | 23% |
| Color | Black |
| Antistatic Property | Electrically conductive |
| Density | 1.28 g/cm³ |
| Tensile Strength | 90 MPa |
| Tensile Modulus | 7500 MPa |
| Elongation At Break | 3.5% |
| Charpy Impact Strength Unnotched 23 C | 45 kJ/m² |
| Melting Point | 178 °C |
| Heat Deflection Temperature 1 8 Mpa | 145 °C |
| Volume Resistivity | 1.0E+6 ohm·cm |
| Surface Resistivity | 1.0E+6 ohm/sq |
As an accredited Evonik Vestamid L-R2-GF25 23% Glass, 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 | Evonik Vestamid L-R2-GF25: black electrically conductive nylon 12 granules, 23% glass, antistatic, supplied in 25 kg sealed bags. |
| Container Loading (20′ FCL) | 20′ FCL loaded with palletized, shrink-wrapped bags of Evonik Vestamid L-R2-GF25, glass-filled antistatic conductive nylon 12, secured safely. |
| Shipping | For shipping, Evonik Vestamid L-R2-GF25 is supplied as black, electrically conductive nylon 12 pellets with 23% glass reinforcement. Standard packaging includes moisture-proof bags or drums to prevent moisture absorption. Handle with care to avoid static discharge; no hazardous cargo classification required under normal transport conditions. |
| Storage | Store in original, unopened packaging in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and ignition. Maintain ambient temperature, ideally between 5–30°C. Keep sealed to prevent moisture absorption, which degrades the nylon. Use within manufacturer’s stated shelf life. Avoid prolonged exposure to UV, humidity, and conductive dust accumulation. |
| Shelf Life | Shelf life is typically 2 years from manufacture when stored unopened, dry, and cool in original packaging. |
Evonik Vestamid L-R2-GF25, a black electrically conductive polyamide 12 compound with a glass fiber content of 23 wt%, is processed as supplied for fuel-contact connector bodies, retaining clips, and pump flanges; the formulation addition level for new tooling is 100 wt% of the moulding feed, with clean regrind from the same lot limited to 20 wt% only when surface resistivity and fuel-aged tensile strength remain within the drawing envelope. In spark-ignition fuel system architectures where non-metallic quick connectors replace metal assemblies, dissipation of triboelectric charge generated during high-velocity fuel flow is governed by the moulded part’s surface-to-bulk resistivity network rather than by the base resin designation alone. Electrostatic discharge compliance for non-metallic fuel system components is evaluated under SAE J1645, with tensile and elongation measurements after fuel immersion conducted according to ISO 527-1/-2 and a maximum residual moisture limit of 0.1 wt% established before melt processing. Production on a reciprocating-screw injection moulding machine with screw L/D of 20:1 to 25:1 is carried out at melt temperatures of 250 °C to 280 °C and mould wall temperatures of 60 °C to 90 °C; back pressure is held at 30–60 bar, melt residence time is kept below 6 min at temperatures above 270 °C, and injection speed is profiled to avoid shear-induced destruction of the conductive carbon/antistatic network in narrow gates. Weld-line placement is critical: glass-fiber orientation transverse to the knit line can raise local surface resistivity by several orders of magnitude, so gate locations are positioned to move weld lines away from grounding clip contact pads and sealing faces. Terminal finished components include fuel quick-connect bodies, retainer collars, fuel pump flanges, tank sender flanges, and EVAP canister mounting flanges; these parts are black, dimensionally stable after fuel exposure, and require no secondary antistatic coating.
Continuous static-dissipative paths from component surface to grounded tooling are required in printed circuit board assembly cells where automated placement heads generate tribocharging on polycarbonate and polypropylene carriers. In this application the conductive PA12 compound with 23 wt% glass fiber is used at 100 wt% as supplied because dilution with unreinforced natural PA12, even at 10 wt%, can shift the measured surface resistance above the packaging limit of 1×10⁶ Ω and compromise decay time. The relevant compliance envelope is ANSI/ESD S20.20-2021 and IEC 61340-5-1:2016, with acceptance testing of moulded trays conducted per ANSI/ESD STM11.11 at 12% RH and 23 °C conditioning; restricted-substance documentation aligns with RoHS 2015/863 for electronics manufacturing equipment. Injection moulding is performed on all-electric machines in silicone-free tooling with clamp force from 800 kN to 1,600 kN, melt temperature 260–285 °C, mould temperature 70–90 °C, and fill speed profiles that minimize jetting at the gate because jetting produces surface resin-rich regions that insulate the conductive network. External mould release agents are excluded; ejection is achieved with poppet valves and air assist. The terminal types are PCB matrix trays, component carrier trays for automated SMT placement, wafer-frame handling trays, and tote inserts for manual ESD-protected areas. A limitation applies: the material is not specified for continuous exposure to solder reflow temperatures or cleaning solvents above 80 °C in load-bearing geometries, and published data for this exact glass-fiber/conductive configuration in reflow ovens is limited.
Because organic powder transfer through rotary valves, diverter flaps, and flexible drop chutes generates surface potentials well above the minimum ignition energy of many fine organic dusts, specification of a glass-reinforced conductive polyamide 12 compound is driven primarily by the need to maintain surface resistance below 10⁹ Ω across abraded surfaces rather than only on moulded skin. The material is introduced at 100 wt% for rotor vanes, end plates, and hopper neck liners; blending with non-conductive regrind or unreinforced non-conductive PA12 is not permitted without repeating explosion-protection surface resistance validation after wear cycling. Compliance is assessed under ATEX 2014/34/EU and EN IEC 60079-0:2018, with electrostatic charge accumulation tests carried out according to IEC TS 60079-32-1 for Group II equipment in powder-handling atmospheres. Thick-section parts are either injection moulded with oil-heated tooling at 80 °C or compression moulded from pre-dried granules at 240–270 °C melt temperature after desiccant drying to 0.1 wt% residual moisture. Because the 23 wt% glass reinforcement produces anisotropic shrinkage in flow versus transverse directions, post-mould machining of sealing faces is performed to a stock allowance of 0.5 mm per side, with shrinkage data generated by tooling trials per ISO 294-4 rather than extrapolated from unfilled PA12. Terminal components include rotary valve rotors, dust-collector discharge chute liners, grounded flange adapters, filter hopper adapter plates, and flexible drop chute connections.
The moulded skin of a glass-filled conductive polyamide 12 wear strip typically registers a lower surface resistance than the abraded subsurface because mould-side polish and resin-rich surface layers can orient conductive filler along the cavity wall; once the part is installed in a hopper discharge or conveyor side wall, sliding contact removes that skin and exposes the underlying filler network. For this reason, antistatic wear strip specifications call for surface resistance verification after 1,000 cycles of abrasive contact using ASTM D4060 methods, not solely on as-moulded plaques. The compound is used at 100 wt% as extrusion feed, with clean in-house regrind limited to 10 wt% because wear-strip impact strength and surface resistivity both degrade when recycled feed exceeds that threshold. The governing standards are IEC 61340-5-1:2016 for ESD-protected plant environments and ASTM D257 or IEC 62631-3-2 for surface and volume resistivity, with values recorded at 500 V test voltage and 23 °C. Production is carried out on a single-screw extruder with L/D 25:1 and a melt pump, using a profile die at 240–260 °C and vacuum calibration; the extruded strip is subsequently stress-relieved in water at 80 °C before machining of mounting holes and bevel edges. Terminal finished parts include hopper discharge liners, chain guide rails, belt skirting wear strips, and grounded side-wall liners for bucket elevators; all are black, dimensionally stable, and intended for dry sliding contact against steel or UHMWPE counterfaces.
The substitution of unfilled polyamide 12 in high-speed winding bobbins with a 23 wt% glass-fiber-reinforced conductive compound alters shrinkage anisotropy and clamp-load retention, so tooling cut for unfilled material cannot be reused without a re-shuffle of gate positions and wall stock. The formulation addition level for new bobbin production is 100 wt% of the conductive compound; recycled bobbins from the same grade may be recompounded at 15 wt% maximum with virgin material when the regrind is cleaned of processing oils and textile finish residues. Mechanical acceptance is verified under ISO 527-1/-2 for tensile modulus and ISO 179-1/1eA for Charpy impact, while static decay of the rotating bobbin surface is checked according to IEC 61340-5-1:2016 and ANSI/ESD STM11.11. Moulding on valve-gated hot-runner systems requires gate diameters of 1.2 mm to 2.0 mm and balanced manifold temperatures because the conductive filler raises viscosity sensitivity at high shear rates and can cause asymmetric cavity filling in four-drop tooling. Melt temperature is maintained at 250–275 °C and mould temperature at 80–90 °C; after ejection, the bobbins are allowed to condition for 24 h at 23 °C before final dimensional inspection. Terminal components include high-speed yarn carrier bobbins, spinneret protection sleeves, thread guide housings, and textile tensioner bodies.
Solvent recovery circuits handling acetone, toluene, and methyl ethyl ketone require components that do not accumulate brush discharge potentials during splash filling and high-velocity vapour extraction; conductive PA12 with 23 wt% glass fiber is selected for roller covers and transfer chute segments because it provides a continuous bleed path to grounding straps while retaining solvent resistance better than many amorphous thermoplastics. The compound is introduced at 100 wt% as supplied; no external antistatic coating is accepted because coating ablation in solvent flow generates non-conductive debris that can blind downstream filters. Compliance is assessed against EN IEC 60079-0:2018 and IEC TS 60079-32-1, and solvent uptake is evaluated by immersion in representative solvents per ISO 175 under the plant’s temperature profile. Roller covers are injection moulded as split cylinders with wall thickness of 6 mm to 8 mm, using conformal cooling and heated moulds at 90 °C to minimize glass-fiber orientation at knit lines; post-mould annealing is carried out at 110–120 °C for 2 h in a nitrogen-purged oven to reduce solvent-induced crazing at machined edges. After annealing, static dissipative performance is re-checked per IEC 62631-3-2 because thermal treatment can alter the conductive network in the outermost layer. Terminal finished parts include idler roller covers, grounded transfer chute segments, vapour extraction baffle plates, and flange adapters for solvent recovery skids. Published data for this exact configuration in combined solvent vapour and abrasion service is limited; therefore, site-specific endurance trials are used to establish change-out intervals.
Competitive Evonik Vestamid L-R2-GF25 23% Glass, Antistatic, Black, Electrically Conductive Nylon 12 prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615365186327 or mail to admin@ascent-chem.com.
We will respond to you as soon as possible.
Tel: +8615365186327
Email: admin@ascent-chem.com
Flexible payment, competitive price, premium service - Inquire now!
Evonik Vestamid L-R2-GF25 is a black, electrically conductive polyamide 12 compound with a nominal glass fiber content of 23% by weight. The grade is supplied for injection molding and extrusion of parts requiring static dissipation combined with the chemical resistance, low moisture uptake, and low-temperature ductility characteristic of PA 12. Conductive behavior is obtained through a carbon-black additive system, not through metallic or metal-coated fillers; the resulting compound is therefore distinct from stainless-steel-fiber and nickel-coated-carbon-fiber conductive thermoplastics in density, corrosion behavior, and melt rheology.
Parts molded from the grade are used in fuel-handling and industrial fluid-transfer systems, including filter housings, quick-connectors, pump components, and line fittings. The material is selected where surface charge accumulation must remain below the levels described in IEC TS 60079-32-1 for explosive atmospheres or below the surface-resistance limits of IEC 61340-5-1 for ESD-protected workspaces. Fuel-contact qualification is part-dependent and typically follows SAE J1645 or OEM fuel-system specifications because published long-term exposure data for this exact grade are limited.
Surface resistivity and volume resistivity for carbon-black-filled PA 12 are not single-point constants. Measured values vary with moisture conditioning, test voltage, electrode contact pressure, and melt-processing history because the conductive carbon-black network is orientation- and shear-sensitive. Laboratory evaluations are commonly performed according to IEC 62631-3-2 for surface resistance and IEC 62631-3-1 for volume resistance, with ASTM D257 retained as a comparative method when specimen conditioning is documented. Conductive grades may show surface resistance below 106 Ω/sq under dry-as-molded conditions, while antistatic compounds are generally specified in the 106–109 Ω/sq range; the exact end-use reading depends on part geometry and conditioning history.
| Attribute | Specification detail |
|---|---|
| Base polymer | Polyamide 12 (PA 12) |
| Glass fiber content | 23% by weight |
| Conductive modifier | Electrically conductive carbon black |
| Color | Black |
| Primary processing | Injection molding, extrusion |
Melt processing must balance two competing requirements. The glass fibers must be wetted and oriented without excessive fiber-length reduction, while the carbon-black agglomerate network must survive sufficient shear to remain percolated. On a twin-screw extruder with an L/D ratio near 40, barrel temperatures are typically set between 220 °C and 250 °C, with melt temperature at the nozzle held near 240 °C for injection molding. Moisture content before melt processing should be controlled below 0.10% by mass to limit hydrolytic chain scission; vacuum drying at 80 °C for 4 h to 12 h is used depending on initial moisture load. Mold-wall temperature is maintained from 60 °C to 80 °C to promote crystallinity and stabilize post-molding shrinkage.
Because the melt contains abrasive glass fiber and conductive carbon black, plastication units should use bimetallic barrels, hardened screw flights, and reverse-taper check valves. General-purpose nitrided screws may show wear after processing lots above 5 t to 10 t of compound, leading to clearance increase and reduced melt homogeneity. Screw geometry with a compression ratio between 2.0:1 and 2.5:1 and a length-to-diameter ratio of 20:1 to 24:1 is common for injection molding glass-filled PA 12; compounding operations use longer L/D ratios to improve dispersion. A free-flow shutoff nozzle is preferred over a reverse-taper nozzle because carbon-black-filled PA 12 can accumulate conductive residue in dead spots.
The combination of 23% glass fiber and carbon black does not behave as a simple additive mix of a structural fiber and a conductive pigment. Glass fibers create local flow fields in the melt that orient high-aspect-ratio particles and may produce resin-rich, glass-poor surface layers. Carbon-black distribution can be depleted from those layers, raising measured surface resistance of the as-molded skin even when the core remains conductive. This skin effect is a known limitation for conductive glass-filled polyamides: surface readings can be influenced by machining, gate location, and flow-front morphology. Electrical acceptance testing should therefore be conducted on the same surface and geometry that will operate in the field, not on polished or cut cross-sections.
Glass fiber also reduces weld-line strength. For 23% glass-filled PA 12, weld-line tensile strength retention can fall below 50% of the un-welded value when converging flow fronts meet downstream of cores, bosses, or split gates. The conductive carbon-black network is likewise interrupted at weld lines, producing local electrical resistance spikes that are often larger than the bulk reading. Mold-filling simulation and gate placement are used to move weld lines away from fuel-wetted pressure boundaries; when this is not possible, part validation includes tensile tests per ISO 527-1 and electrical surface-resistance scans across the weld zone.
Residence time is a critical variable. Extended production pauses at melt temperatures above 250 °C shift surface resistance of carbon-black-filled PA 12 upward because the conductive carbon-black structure is progressively dispersed and the PA 12 matrix undergoes thermal-oxidative aging. The same effect is observed when reground material is reintroduced at high ratios: each heat history lowers electrical percolation. Injection molders therefore limit regrind to levels established by part acceptance testing and record melt residence time in the barrel. Shutdown procedures include purging with a stable PA 12 purge compound and lowering barrel temperatures before idle periods.
| Variable | Range |
|---|---|
| Pre-drying temperature | 80 °C |
| Residual moisture before melt processing | <0.10% |
| Melt temperature | 230 °C–250 °C |
| Mold-wall temperature | 60 °C–80 °C |
| High-temperature idle barrier | purge and reduce to <180 °C |
Hot-runner systems must avoid low-flow zones and abrupt cross-section changes. The conductive carbon-black network can degrade during prolonged hold in hot runners, and glass fibers can settle or orient at the gate. Needle shutoff gates with polished flow channels are preferred; gate diameter should be sized to prevent excessive shear heating. Hot-runner tip temperature is maintained within 240 °C to 260 °C, while manifold temperatures may be slightly lower. Acceptable residence time in the hot-runner system is usually shorter than in the injection barrel because the heated runner holds a small volume at high temperature for multiple cycles.
PA 12 absorbs less water than PA 6 or PA 66, but the compound is not dry-as-molded unless processed from sealed drying. At equilibrium at 23 °C and 50% relative humidity, the PA 12 matrix may contain approximately 0.7% to 1.0% moisture. That moisture plasticizes the matrix and can temporarily reduce surface resistance by increasing ionic mobility. It also lowers melt viscosity during processing. Moisture content measured by Karl Fischer titration is therefore a release parameter for conductive performance, not an optional handling detail.
Compared with unfilled antistatic PA 12, the 23% glass loading raises tensile modulus and creep resistance but lowers elongation at break and notched impact strength. Unfilled conductive PA 12 grades are usually specified for flexible clips, cable ties, or small connectors where dimensional stability is not the controlling criterion. The glass-reinforced grade is specified when a fuel-system component must retain thread torque, resist hoop stress, or maintain flatness after thermal cycling.
Compared with metal-filled conductive PA 12, the carbon-black-filled glass compound avoids the galvanic-cell risk that can arise when nickel-coated carbon fiber or stainless-steel fibers contact aluminum counterparts. It also reduces abrasive wear on injection-molding barrels, screw tips, and hot-runner components, because carbon black is substantially less abrasive than metallic fibers. The compromise is lower electrical conductivity: metal-filled systems may achieve volume resistivity below 100 Ω·cm, while carbon-black systems generally plateau between 102 and 106 Ω·cm depending on orientation and moisture. Applications requiring earthing rather than static dissipation may therefore require embedded conductors or metallic additives.
The glass content is reported as 23% by weight; the corresponding volume fraction is approximately 10% to 11% because the density of E-glass is roughly 2.54 g/cm³. This distinction matters when comparing modulus or shrinkage predictions made with simulation software, which require fiber volume fraction, not weight fraction. Injection-molded plates and cylindrical parts also show anisotropic shrinkage. Linear mold shrinkage in the flow direction is lower than in the transverse direction; values depend on gate geometry and wall thickness. Mold-filling simulation with fiber orientation tensor calculations should be used for dimensions with tolerances below 0.1 mm or for parts that must seal against O-ring grooves.
The PA 12 base provides lower saturated moisture uptake than PA 6 or PA 66. In fuel-contact service, the main chemical aging routes are not dissolution of the polymer matrix but swelling and oxidation by fuel contaminants or aggressive biofuel blends. Compatibility with fuel components is assessed per ISO 175; dimensional change and surface-resistivity change should be measured after immersion in the target fuel at the upper service temperature. Polar fluids such as methanol, ethanol, and aggressive biodiesel fractions can swell PA 12 and alter the conductive network. Resistance changes after fuel exposure are not necessarily permanent but must be bounded by qualification testing.
Carbon-black-filled conductive polymers exhibit positive temperature coefficient behavior near the melting region; resistance can increase with temperature because polymer expansion separates conductive particles. If a fuel-system component operates above 80 °C continuously, the surface-resistance value measured at room temperature may not be representative. Qualification should include resistance measurement at the upper service temperature and after thermal cycling per IEC 60068-2-14 or component-specific humidity-temperature cycling.
For ESD-protective packaging or handling trays, static decay rate is measured according to FTMS 101C Method 4046.1, with a common criterion of less than 2 s from 5000 V to 500 V at 12% relative humidity for electronics industry specifications. Durable trays and fixtures may be molded from this PA 12 compound, but component-level verification is required because static decay is geometry-dependent.
Joining methods such as hot-plate welding, laser welding, and ultrasonic welding alter the carbon-black network and glass-fiber orientation at the weld interface. Laser welding of black conductive grades is complicated by high absorption; if through-welding of a laser-transparent half to a black conductive half is required, the black half absorbs more energy and may degrade before full melt depth is achieved. Process development should use heat-generation models and weld-strength tests per ISO 527 or lap-shear test arrangements. Adhesive bonding may be preferable but requires surface treatment and resistance measurement across the bond line if the bond is part of an electrostatic dissipation path.
Incoming inspection of the compound is generally limited to moisture content, ash content for glass content confirmation, and melt flow or capillary viscosity. Thermogravimetric analysis under nitrogen followed by oxidation confirms filler fraction. The grade is supplied as a thermoplastic compound; it is not an ESD-certified article. Conformance to ATEX Directive 2014/34/EU is evaluated at the finished assembly level. The compound is used in components that are assessed under IEC TS 60079-32-1 for electrostatic hazards in explosive atmospheres. Regulatory data for REACH and RoHS should be obtained from the manufacturer’s safety data sheet.
