| HS Code | 346208 |
| Material | Polyamide 12 (PA 12) |
| Density | 1.08 g/cm³ |
| Tensile Strength | 85 MPa |
| Elongation At Break | 2.0% |
| Flexural Modulus | 6500 MPa |
| Melting Point | 178 °C |
| Heat Deflection Temperature | 145 °C |
| Surface Resistivity | 10^3 Ω/sq |
| Volume Resistivity | 10^2 Ω·cm |
| Flammability Rating | UL94 HB |
As an accredited LATI Latigray 82-04 CX/90 PA 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, moisture-proof polyethylene-lined paper bags, clearly labeled with the product name and batch identification. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL) for LATI Latigray 82-04 CX/90 PA 12: palletized bags, shrink-wrapped, secured to prevent movement, maximizing space. |
| Shipping | LATI Latigray 82-04 CX/90 PA 12 is a polyamide 12-based compound supplied as solid granules/pellets. It is non-hazardous for transport under normal conditions, shipped in sealed, moisture-resistant packaging. Keep dry, avoid excessive heat, and store away from strong oxidizers. Standard freight handling with no special transport classification required. |
| Storage | Store LATI Latigray 82-04 CX/90 PA 12 in its original, tightly sealed container in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and moisture. Maintain ambient temperatures between 15–30°C. Reseal packaging immediately after use to prevent humidity absorption. Avoid exposure to oxidizing agents. Use within manufacturer’s stated shelf life to preserve material performance. |
| Shelf Life | Shelf life is typically 2 years from production date when stored dry, cool, and in original sealed packaging. |
The application boundaries for Latigray 82-04 CX/90 PA12 are defined by its carbon-fibre-reinforced, static-dissipative thermoplastic matrix, which requires moisture-stable handling and process control across all downstream moulding operations. Pre-drying, fibre-length preservation, and gate position selection determine whether the as-moulded surface resistance remains within the specified window for each sector described below.
The dissipation of static charge from polyamide 12 carriers is achieved through a carbon-fibre network that establishes volume conductivity, not through migratory antistatic additives that can leave surface residues on wafers or reticles. In wafer-handling equipment, contaminant transfer and field-induced gate oxide damage are controlled when surface resistance remains in the 1×10⁴–1×10⁹ Ω range measured in accordance with ANSI/ESD STM11.11-2015, while charge decay times below 2.0 s are verified under IEC 61340-5-1:2016 and ANSI/ESD S20.20-2021. The compound is processed at 100 wt% as-supplied, without carbon black masterbatch or external conductive coatings; regrind from sprues and runners may be reintroduced up to 20 wt% where lot-to-lot resistance variation of ±0.5 decade is acceptable, but virgin-only shot weights are specified for end effectors entering ISO Class 4 cleanrooms. Pre-drying in a desiccant dryer at 80 °C for 4–6 h to a residual moisture of ≤0.10 wt% is required before injection moulding; melt temperature should be held between 245 °C and 270 °C, with mould temperatures of 80–110 °C to reduce frozen-in orientation at gate seams. Equipment with a screw L/D ratio of 20:1 and compression ratio of 2.0:1–2.5:1, fitted with a free-flow check ring and nozzle orifice diameter not smaller than 4.0 mm, prevents carbon fibre attrition that raises surface resistance at the part surface. Multi-cavity hot-runner tools with sequential valve gating improve weld-line resistivity consistency compared with cold sprue-fed layouts. Terminal parts include wafer cassettes, vacuum wands, HBM test socket bodies, and robotic end-effector fingers.
In automotive fuel delivery systems, PA12 compounds are specified where connectors and clips must survive alcohol-blended fuels, saline splash, and zinc chloride pre-treatment without stress cracking, while carbon-fibre conductivity prevents charge accumulation during high-velocity fuel flow. Moulded quick connectors are governed by SAE J2044:2019 for interface dimensions and by SAE J1645 where electrostatic dissipation is specified; low-temperature impact after fuel exposure is validated according to ISO 16750-4:2010 climate tests. The grade is loaded at 100 wt% in the moulding machine hopper, with 10–15 wt% clean runner regrind permitted only for non-appearance brackets, because carbon fibre length reduction shifts surface resistance upward by approximately 0.2–0.4 decade and reduces notched impact at −40 °C. Drying at 80 °C for 4–6 h to ≤0.10 wt% moisture is mandatory before processing; melt temperatures above 280 °C should be avoided because PA12 chain scission generates volatiles that cause gate blush and loss of burst pressure retention. Injection moulding of multi-cavity connector tools is run at melt 250–270 °C, mould 80–100 °C, holding pressure 70–90 MPa, and screw back pressure 2–5 bar; clamping pressure should be selected to maintain parting line flash below 0.03 mm on sealing barb features. Terminal products include quick-connect couplings, retainer clips, fuel line brackets, and evaporative canister purge connectors.
Because passive component leads, flexible circuits, and board carriers are strongly triboelectric in automated pick-and-place cells, transport trays and shuttles must dissipate charge before potential reaches ±100 V; this is achieved when moulded surface resistance is held between 1×10⁴ Ω and 1×10⁹ Ω per ANSI/ESD STM11.11-2015, with compliance to IEC 61340-5-1:2016 and ANSI/ESD S20.20-2021. The material is used at 100 wt% without secondary conductive additives, and regrind is limited to 20 wt% in trays not used for automated optical inspection, where carbon fibre micro-voids can scatter light and reduce contrast. Thin-wall tray moulding requires melt temperature 255–280 °C and mould temperature 60–90 °C; the low thermal conductivity of carbon-fibre-reinforced PA12 requires holding pressure 20–30 MPa for 8–12 s to control warpage below 0.5 mm across a 300 mm span. Balanced gate positions and electrohydraulic injection speed of 80–120 mm/s reduce fibre orientation gradients that otherwise create isolated insulating domains at peripheral ribs. Plastication screw peripheral speed should not exceed 0.5 m/s; at higher speeds, fibre length reduction raises surface resistivity by approximately 0.5 decade. Terminal components include ESD trays, PCB shuttles, solder paste stencil frames, and component carrier pockets for tape-and-reel work cells.
| Application sector | Governing standard | Test method | Acceptance threshold |
|---|---|---|---|
| Semiconductor wafer fixtures | ANSI/ESD S20.20-2021, IEC 61340-5-1:2016 | ANSI/ESD STM11.11-2015 | 1×10⁴–1×10⁹ Ω |
| Automotive fuel connectors | SAE J2044:2019, SAE J1645 | ISO 16750-4:2010 | surface resistance ≤1×10⁶ Ω, no sparking |
| Electronic assembly trays | IEC 61340-5-1:2016, ANSI/ESD S20.20-2021 | ANSI/ESD STM11.11-2015 | 1×10⁴–1×10⁹ Ω |
| ATEX conveying components | 2014/34/EU, EN 60079-0:2018, EN ISO 80079-36:2016 | IEC 60093, ASTM D257-14 | surface resistance <1×10⁹ Ω |
| Light-duty gears | VDI 2736-2:2014 | ISO 1328-1:2013 | component-level tooth root validation required |
| Textile bobbins | IEC 61340-5-1:2016, RoHS 2011/65/EU, REACH 1907/2006 | ANSI/ESD STM11.11-2015 | charge decay <2.0 s |
Under ATEX and IECEx assessments, non-metallic components in pneumatic conveying lines must demonstrate charge dissipation adequate to prevent propagating brush discharges; the typical acceptance criterion is surface resistance below 1×10⁹ Ω measured by IEC 60093 or ASTM D257-14, while equipment categories are assigned under Directive 2014/34/EU, EN 60079-0:2018, and EN ISO 80079-36:2016. The compound is processed at 100 wt%; post-mould antistatic lacquers and paints are incompatible with the conductivity path through the bulk and should not be specified, while regrind is limited to 15 wt% because carbon fibre length attrition raises the percolation threshold. Thick-walled elbows and diverter flaps are injection moulded at melt 235–260 °C and mould 70–100 °C; mould surface temperature above 100 °C is avoided to prevent excessive crystallinity gradients that reduce impact resistance at −20 °C. Gate placement is positioned away from particle impact zones on elbow radii because weld lines created by fibre-poor resin accumulation can show surface resistance one to two decades higher than the bulk. Hot-runner needle valve gaps below 0.5 mm should be avoided due to carbon fibre jamming and gate stall. Terminal parts include powder transfer pipe elbows, diverter valve flaps, filter housings, sight-glass retainers, and vacuum wand bodies.
| Application sector | Drying condition | Melt temperature | Mould temperature | Regrind limit | Key equipment constraint |
|---|---|---|---|---|---|
| Semiconductor wafer fixtures | 80 °C, 4–6 h, ≤0.10 wt% | 245–270 °C | 80–110 °C | 20 wt% | nozzle orifice ≥4.0 mm |
| Automotive fuel connectors | 80 °C, 4–6 h | 250–270 °C | 80–100 °C | 10–15 wt% | parting line flash ≤0.03 mm |
| Electronic assembly trays | 80 °C, 4–6 h | 255–280 °C | 60–90 °C | 20 wt% | warpage ≤0.5 mm over 300 mm span |
| ATEX conveying components | 80 °C, 4–6 h | 235–260 °C | 70–100 °C | 15 wt% | hot-runner valve gap ≥0.5 mm |
| Light-duty gears | 80 °C, 4–6 h | 250–275 °C | 100–130 °C | 15 wt% | centre gate or three radial gates |
| Textile bobbins | 80 °C, 4–6 h | 250–275 °C | 80–100 °C | 15 wt% | vent depth 0.02–0.03 mm |
Evaluate the load-carrying capacity of injection-moulded gears through VDI 2736-2:2014 using component-level tooth root bending tests rather than by tensile strength alone, because carbon-fibre orientation at the fillet controls crack initiation under repeated tangential loading. For light-duty power and motion transmission below 6 m/s pitch line velocity, the compound is moulded at 100 wt%; regrind use above 15 wt% is not recommended for gear flanks because shortened fibres reduce flank wear resistance more than root strength. Mould temperatures of 100–130 °C are used to reduce frozen-in orientation and improve tooth-root fatigue limits, while melt temperature is controlled at 250–275 °C with screw back pressure 3–6 bar to maintain fibre length. A centre gate with a diaphragm or three radial gates is preferred; weld lines behind gear teeth are avoided because they reduce tooth root strength by 20–40% compared with weld-free regions. Surface temperature rise during gear meshing can exceed 50 °C above ambient at 6 m/s; because PA12 has a lower continuous service temperature than PA46 or PEEK, design torque limits should be derated when ambient temperature approaches 80 °C. Dimensional acceptance follows ISO 1328-1:2013 for tooth flank geometry; published wear factors for this exact grade in gear tooth contact are limited, so component-level testing under the intended torque and temperature range is required. Terminal products include office automation spur gears, conveyor drive sprockets, cam followers, and wear pads.
Spinning and winding machines generate electrostatic charge through fibre-to-metal friction, and bobbins or yarn guides that accumulate charge disturb tension sensors and attract fibre fly, causing yarn breaks. The compound is used at 100 wt%, with regrind limited to 15 wt% because recycled carbon fibre in thin-walled bobbins increases surface resistivity above 1×10⁹ Ω when fibre length drops below the percolation threshold. Where the equipment operates in plants certified to IEC 61340-5-1:2016, charge decay below 2.0 s is required; material conformity to RoHS 2011/65/EU and REACH 1907/2006 is documented by supplier declarations. Drying at 80 °C for 4–6 h is mandatory; melt temperatures of 250–275 °C and mould temperatures of 80–100 °C are used for high-cavitation bobbin tools with cycle times of 25–40 s. Ventilated moulds with vacuum channels of 0.02–0.03 mm depth reduce gas entrapment that causes burn marks on thin bobbin rims. Carbon fibre may deposit on cavity surfaces after extended runs; manual cleaning with soft brass brushes is recommended because abrasive compounds remove mould steel and alter surface finish. Terminal components include spinning bobbins, winding mandrels, yarn carrier rings, and needle bar support blocks.
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The designation LATI Latigray 82-04 CX/90 PA 12 identifies a conductive carbon-modified polyamide 12 compound supplied under the Latigray series. The base polymer is a semicrystalline aliphatic polyamide whose lower amide-group density compared with PA 6 or PA 66 reduces equilibrium moisture uptake; under ISO 62 conditioning at 23 °C and 50 % relative humidity, unfilled PA 12 typically absorbs 0.2–0.3 % moisture, whereas PA 6 and PA 66 can exceed 2.0–3.0 %. The Latigray designation is applied to electrically dissipative or conductive compounds, and the CX/90 suffix indicates a carbon-based conductive filler package. The exact filler morphology, loading, and percolation threshold for 82-04 CX/90 should be obtained from the current LATI technical datasheet because published data for this specific configuration is limited.
Compared with unfilled PA 12, the conductive filler package raises melt viscosity and elastic modulus while reducing tensile elongation and notched Charpy impact values determined under ISO 527-1/-2 and ISO 179-1/1eA. The practical consequence is that the material is selected where electrostatic dissipation, dimensional stability in low-humidity environments, and resistance to aliphatic hydrocarbons are required simultaneously, not where maximum thin-wall impact toughness or high-gloss surface finish is the primary design constraint.
Within the Latigray family, the 82-04 code separates this product from grades based on PA 6, PA 66, POM, or PBT. The PA 12 base provides lower water uptake and lower processing temperatures than PA 6 or PA 66 compounds, while the conductive filler distinguishes it from unfilled PA 12. The combination is relevant in fixtures and housings that must maintain surface resistivity below the insulative threshold while limiting moisture-driven dimensional change.
Drying is the first processing boundary. Although PA 12 is less hygroscopic than PA 6 or PA 66, residual moisture above 0.10 % can produce hydrolysis at melt temperatures above 240 °C, leading to viscosity loss, surface splay, and unstable surface resistivity. A desiccant dryer with a dew point of −30 °C or lower and an air flow of at least 1.85 m³/h per kg/h of throughput is standard practice. Drying at 80 °C for 4–8 h in a dry-air hopper is normally sufficient if the material is conveyed in closed lines; if ambient relative humidity exceeds 60 %, dry-air conveying should continue to the machine hopper and the hopper should be blanketed with dried air.
The melt temperature window commonly used for PA 12 compounds is 220–250 °C, with a preferred melt temperature of 230–245 °C. Barrel temperatures should be profiled from 210 °C at the feed throat to 245 °C at the nozzle; sustained exposure above 260 °C should be avoided. Mold temperature controls crystallization and surface quality; for carbon-filled PA 12, mold temperatures in the 60–100 °C range are typical, with the higher end used for thin-wall parts where flow length and conductive network retention are critical. Insufficient mold temperature can produce a resin-rich skin that elevates surface resistivity at the part boundary.
Screw geometry on a single-flight, low-shear screw with an L/D of 20:1–25:1 and compression ratio of 1.5:1–2.5:1 is preferred over high-shear barrier screws. Back pressure should be held to 3–8 bar and screw rotation speed to 50–120 rpm depending on screw diameter; excessive shear can break the conductive filler network and raise surface resistivity, while inadequate shear can leave agglomerates and create anisotropic conductivity. Total residence time should not exceed 8 min; if the machine stops for more than 15 min, the barrel should be purged with unfilled PA 12 or a commercial purging compound to avoid carbon-filled heel degradation.
Regrind use in conductive PA 12 is an operational boundary rather than an unlimited variable. The carbon network cannot be re-dispersed without altering filler aspect ratio and polymer molecular weight. Industrial practice often limits regrind to 20–30 % by weight in noncritical applications; for parts with specified surface-resistivity ranges under IEC 61340-5-1, first-pass regrind should be avoided unless a full lot qualification demonstrates that resistivity and tensile elongation remain within the part drawing limits.
Electrostatic dissipative components molded from this class of compound should be validated by measuring surface resistivity on conditioned plaques and on molded parts. The testing procedure typically follows IEC 62631-3-2 or ASTM D257 using a concentric-ring electrode on 100 mm × 100 mm × 3 mm plaques conditioned at 23 °C and 50 % RH for at least 48 h. A 100 V test voltage is common for dissipative materials; readings are time-dependent and should be recorded at 60 s electrification. The same measurement on finished parts should include gate regions, weld lines, and thin ribs, because carbon-filled polyamides can exhibit resistivity variation of two to three decades across the flow path when gate dimensions are undersized or fill speed is outside the optimized window. A production-scale trial on a 120-tonne hydraulic molding machine with cavity pressure transducers at the nozzle, gate, and end-of-fill positions is recommended before release of a new tool.
Because the grade-specific datasheet values for LATI Latigray 82-04 CX/90 PA 12 may not be publicly available, the following table provides a reference envelope only. It compares unfilled PA 12 with conductive carbon-filled PA 12 analogues and is not a certificate of conformance. All values are dry-as-molded or conditioned according to the relevant standard unless noted.
| Property | Test method | Unfilled PA 12 reference envelope | Conductive carbon-filled PA 12 analogue envelope |
|---|---|---|---|
| Density | ISO 1183-1 | 1.01 g/cm³ | 1.05–1.20 g/cm³ |
| Tensile modulus | ISO 527-1/-2 | 1.2–1.6 GPa | 1.8–3.5 GPa |
| Tensile elongation at break | ISO 527-1/-2 | >100 % | 3–20 % |
| Charpy notched impact strength at 23 °C | ISO 179-1/1eA | 5–12 kJ/m² | 2–8 kJ/m² |
| Melting temperature | ISO 11357-1/-3 | 175–180 °C | 174–180 °C |
| Moisture absorption at 23 °C, 50 % RH | ISO 62 | 0.2–0.3 % | 0.2–0.4 % |
| Surface resistivity | IEC 62631-3-2 | 1012–1014 Ω | 102–106 Ω |
The conductivity transition is not solely a function of filler loading. Dispersion quality, filler structure, and injection molding shear history all affect the percolation curve. A carbon-black-filled PA 12 can show a nonlinear drop in resistivity when filler loading exceeds the percolation threshold; below that threshold, resistivity remains near the unfilled polymer value. The CX/90 modifier should therefore be understood as a formulation family rather than a single guaranteed resistivity value.
External mold release sprays containing silicone or hydrocarbon oils are generally incompatible with surface-resistivity requirements because they form insulating films. If demolding requires assistance, a silicone-free mold release or self-releasing mold texture should be validated by IEC 62631-3-2. Cleaning of molded parts before resistivity testing should remove surface contamination without solvent residues; isopropanol wiping followed by vacuum drying at 40 °C for 2 h is practical for laboratory specimens.
Replacing unfilled PA 12 with LATI Latigray 82-04 CX/90 PA 12 in a snap-fit or structural component requires re-evaluation of strain-at-break, notched impact, and thermal expansion. Unfilled PA 12 can sustain high assembly strains because its tensile elongation at break under ISO 527-1/-2 often exceeds 100 %. The conductive carbon-filled analogue can fall into the 3–20 % range; snap-fit designs that rely on a one-time assembly deflection of 4–6 % may be acceptable, but any stress concentration at the snap-fit root should be recalculated using the secant modulus at the relevant strain rate and the Charpy notched impact value from ISO 179-1/1eA.
Thermal expansion is modified by the filler. Unfilled PA 12 typically has a coefficient of linear thermal expansion in the 100–130 × 10−6 K⁻¹ range below and above the glass transition under ISO 11359-2; carbon filler usually reduces the coefficient to perhaps 60–90 × 10−6 K⁻¹, but the exact value for 82-04 CX/90 must be confirmed by testing because the filler type, orientation, and loading determine the result. The reduction in thermal expansion improves the fit of mated parts across a −40 °C to 80 °C service window but can increase residual stress when the part is ejected from a hot mold and cooled rapidly.
Compared with conductive PA 6 or PA 66 grades, the PA 12 base of this product offers lower equilibrium moisture uptake and a flatter surface-resistivity response between dry and humid conditions. Compared with conductive polypropylene or polyacetal compounds, the PA 12 grade generally provides higher upper-use temperature retention and better aliphatic hydrocarbon resistance. Compared with carbon-fiber-reinforced PA 12, a carbon-black or graphite-based Latigray grade may yield more isotropic shrinkage and lower surface roughness but lower tensile modulus and strength. The choice between a carbon-fiber-reinforced conductive grade and a carbon-black-based conductive grade should be based on whether stiffness or isotropic electrical and dimensional properties dominate the part specification.
Material selection for the European Union requires review of the grade-specific REACH candidate list declaration and the Directive 2011/65/EU Annex II restrictions. Carbon-based fillers may contain trace polycyclic aromatic hydrocarbons depending on feedstock and conversion route, so the supplier’s purity statement and food-contact status should be requested. The PA 12 base resin may be described under FDA 21 CFR 177.1500, but carbon-filled compounds are not automatically covered and are generally not suited for direct food contact. Flame-retardant performance must be confirmed from the supplier’s UL Yellow Card under UL 94; unfilled PA 12 often achieves HB at 1.5 mm, but conductive fillers can alter ignition behavior and must not be assumed to carry the same rating.
The operating boundary for continuous service in air is set by oxidative stability rather than immediate melting. Carbon-filled PA 12 can develop surface oxidation above approximately 120 °C over extended exposure, causing surface resistivity rise and eventual embrittlement; applications above that temperature should use long-term heat-aging data under UL 746B or a comparable air-oven aging method. Avoid combination with amine-based flame-retardant or nucleating additives because amine functionalities can alter the filler-matrix interface and shift the percolation threshold. The material should be purged from hot barrels before shutdown; if a conductive grade remains in a barrel at 240 °C for more than 30 min, degradation can form carbonized deposits that require purging and barrel pull.
