| HS Code | 690348 |
| Product Name | LATI Latigray 82-05 CX/90 PA 12 |
| Base Polymer | Polyamide 12 (PA12) |
| Fillers | Carbon fiber and graphite |
| Density | 1.19 g/cm³ |
| Melting Point | 178 °C |
| Heat Deflection Temperature 1 8 Mpa | 110 °C |
| Tensile Strength At Break | 70 MPa |
| Tensile Modulus | 6.0 GPa |
| Elongation At Break | 3 % |
| Flexural Modulus | 6.5 GPa |
| Charpy Notched Impact Strength | 4 kJ/m² |
| Volume Resistivity | 1e3 Ω·cm |
| Surface Resistivity | 1e4 Ω/sq |
| Water Absorption | 0.4 % |
| Flammability Class | HB |
As an accredited LATI Latigray 82-05 CX/90 PA 12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | LATI Latigray 82-05 CX/90 PA 12 is supplied in sealed 25 kg polyethylene-lined paper bags, protected from moisture. |
| Container Loading (20′ FCL) | 20′ FCL loading of LATI Latigray 82-05 CX/90 PA 12 pellets in sealed bags, secured on pallets, protected from moisture. |
| Shipping | LATI Latigray 82-05 CX/90 is a polyamide 12 (PA12) compound supplied as granules/pellets. Ship in sealed, moisture-proof bags or containers to prevent water absorption. Non-hazardous, but avoid excessive heat and humidity. Store dry and handle with standard dust protection. Ensure proper labeling and documentation for polymer resins. |
| Storage | Store LATI Latigray 82-05 CX/90 PA 12 in its original, unopened packaging in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and moisture. Keep sealed to prevent humidity absorption. Recommended storage temperature is below 50°C. Use within manufacturer’s specified shelf life, protecting from dust and contamination. |
| Shelf Life | Shelf life is typically two years from production date when stored in original, sealed packaging in a cool, dry place. |
Fuel vapor carrier components such as quick connectors, tank-mounted ORVR valves, and fuel filter housings are molded from LATI Latigray 82-05 CX/90 PA 12 in tools with 12 to 16 cavities where valve gating or sequential valve gating is used to avoid knit-line resistivity spikes. The compound is pre-dried in a desiccant dryer with a dew point below −30 °C at 80 °C to 90 °C for 4 h to 6 h; after drying, the granulate is conveyed to the injection unit through closed dry-air lines rather than open hoppers because PA12 adsorbs atmospheric moisture rapidly, and residual moisture above 0.10 % by ISO 15512 raises melt pressure fluctuation during plasticating. Melt temperature measured at the nozzle is maintained between 230 °C and 255 °C, while mold wall temperature is held at 40 °C to 70 °C to limit post-mold crystallization shrinkage below 1.5 % in accordance with ISO 294-4. Melt volume-flow rate on dried granulate may be checked per ISO 1133-1:2022 at 235 °C / 5 kg; conductive PA12 grades typically fall between 5 cm³/10 min and 15 cm³/10 min, but published data for this specific LATI grade is limited and should not replace first-lot rheological data. The carbon-based conductive network in the grade is shear-sensitive during cavity filling; screw back pressure above 10 bar or injection velocities above 150 mm/s on a 30 mm screw may produce surface resistivity drift of one decade across the same cavity when measured per IEC 62631-3-2, a failure mode observed when regrind ratios exceed 20 % without adjusting melt residence time. Qualification for fuel-contact components includes immersion in Fuel C for 72 h at 40 °C per ISO 1817, followed by surface resistance measurement per IEC 62631-3-2; automotive OEM specifications frequently reference SAE J1645 for electrostatic charge mitigation in fuel vapor zones, with a common acceptance limit of <1 × 10^6 Ω/sq for plastic housings, although published data for this LATI grade under SAE J1645 is limited and pre-series testing on production tooling remains mandatory.
In cleanroom wafer handling and electronics manufacturing, PA12 conductive components are selected for low particle shedding relative to fiberglass-filled polymers and for controlled surface resistivity in the dissipative range. Wafer combs, chip tray nests, and end-effector cassettes molded from LATI Latigray 82-05 CX/90 PA 12 must meet static decay times below 2 s from 1000 V to 100 V when tested under IEC 61340-2-1, with surface resistance between 10^4 Ω and 10^6 Ω measured at 100 V according to IEC 61340-5-1 acceptance methods. Cleanroom qualification is complicated by the fact that carbon-filled PA12 may generate particles under frictional contact with polycarbonate carriers; surface roughness below Ra 0.8 µm per ISO 4287 is usually specified to reduce particle generation, and machined parts are post-cleaned with isopropyl alcohol in an ultrasonic bath followed by HEPA-filtered air drying. Injection molding of thin-walled cassette rails below 2 mm thickness on a 60-ton electric injection molding machine requires mold temperature at the upper end of the PA12 range, 70 °C to 80 °C, to prevent premature solidification before the conductive filler network is wet out. Long flow paths above 150 mm can cause anisotropic filler orientation at the melt front, creating a high-resistance skin layer; valve-gated hot tips with 1.5 mm to 2.0 mm gate land and independent tip temperature control reduce resistance variation to less than 0.5 decade across a 32-cavity tool, according to production-scale data on similar PA12 carbon-filled compounds. Outgassing for vacuum environments is not typically a strength of PA12; where the component sits inside a vacuum load lock, published data for this specific grade is limited and tests per ASTM E595-15 for total mass loss and collected volatile condensable material should be executed on machined prototypes before release.
For dilute-phase pneumatic conveying of organic powders, flour dust, or plastic regrind, conductive PA12 liners and coupling gaskets prevent triboelectric charge accumulation on non-metallic surfaces inside pipes operating in ATEX Zone 20 and Zone 21 classifications. The LATI Latigray 82-05 CX/90 PA 12 grade is extruded into tubular liners with wall thickness between 2 mm and 4 mm on single-screw extruders with a 30 L/D barrel and a barrier screw designed for filled polyamide; vented barrel sections are kept under vacuum below −0.08 bar to remove residual moisture during extrusion, because carbon-filled PA12 is more sensitive to surface pitting from steam than unfilled PA12. Surface resistance of the liner measured on the inner bore after 200 h of talc particle impingement should remain below 10^9 Ω per IEC 60079-32-1, which requires non-metallic surfaces in explosive atmospheres to be sufficiently conductive to prevent propagating brush discharges. The limiting design constraint is that carbon-filled PA12 liners lose conductivity if the pipe bend radius introduces localized elongation above 5 % during thermoforming; therefore bends below 3D centerline radius are usually fabricated with a two-piece clamshell design rather than a bent extruded tube. For rollers and bearings in ATEX environments, injection molded PA12 conductive parts replace cast iron or aluminum to reduce spark risk from mechanical impact; mechanical validation includes Charpy impact strength at 23 °C per ISO 179-1/1eU and hardness measured with a Shore D durometer per ISO 868, with regrind use limited to 15 % by weight because multiple heat histories degrade the conductive carbon network and reduce notched impact strength by more than 20 % relative to virgin material in published PA12 carbon-black compound data.
Cable glands, blanking plugs, and enclosure cable entry frames for Ex e and Ex i circuits are machined or molded from PA12 conductive stock when the electrical installation requires a non-metallic component with surface resistance below 10^9 Ω in service. The grade LATI Latigray 82-05 CX/90 PA 12 is processed at melt temperatures between 225 °C and 250 °C using a vented barrel and a low-compression screw with a 2.5:1 compression ratio to avoid over-shearing the conductive filler; injection molded glands for metric thread sizes M20 to M32 are gated at the thickest collar section with a fan gate 1.2 mm to 1.8 mm thick, preventing gate-seal freeze-off from interrupting packing and causing sink marks that alter thread geometry beyond ISO 965-1 tolerance class 6g. Electrical safety certification under IEC 60079-0 Clause 7.4 and IEC 60079-7 requires the surface resistance of non-metallic enclosures to be tested after damp heat conditioning at 40 °C and 93 % RH for 28 days; PA12 absorbs less water than PA6 or PA66 under the same conditions as described in ISO 62, but carbon-filled PA12 can still shift from dissipative to insulative at moisture content above 2 %, so sealing faces and exposed threads may need a nickel-coated brass shield if the installation is exposed to condensing humidity. Production-scale issues include thread tearing during ejection when mold release pressure is not balanced; a two-stage ejection profile with a 10 mm stroke delay on the stripper plate reduces scrap below 3 % in multicavity tools.
Industrial automation sensor housings, proximity switch bodies, and flow meter enclosures are converted from powder-coated aluminum or stainless steel to conductive PA12 where the housing must dissipate static charge from high-velocity plastic packaging webs or from dry granular media in mixers. The replacement is justified only when the operating temperature remains below 80 °C continuous, because PA12 conductive compounds lose dimensional stability above that threshold and creep under continuous clamp loads; bolted flange joints should be designed with steel compression limiters to maintain 2 N·m to 4 N·m tightening torque without cracking the PA12 boss, following ISO 898-1 property class for the limiter rather than the polymer body. In accelerated tests on similar PA12 carbon-filled grades, exposure to 85 °C and 85 % RH for 1000 h shifts surface resistivity by one to two decades, so designs that rely on a resistivity below 10^6 Ω must include an environmental safety factor or a conformal metallic guard layer. Injection molding of housing walls between 2.5 mm and 4 mm on a 120-ton hydraulic clamp unit requires mold temperatures from 50 °C to 70 °C; filling studies show that a single submarine gate at the base produces a ring-shaped high-resistance zone at the opposite side of the housing if flow length exceeds 120 mm, which is resolved by dual edge gates located at 120° spacing. Dimensional checks per ISO 2768-1 fine tolerance on housing bores should be performed after 48 h post-molding conditioning at 23 °C and 50 % RH, because PA12 absorbs approximately 0.7 % water at saturation per ISO 62, and moisture uptake causes bore growth of 0.1 % to 0.2 % in unreinforced PA12 grades.
When bucket elevator bearings in grain mills operate under continuous dust loading, the non-metallic bearing insert must dissipate triboelectric charge generated during bucket-to-casing contact. LATI Latigray 82-05 CX/90 PA 12 is machined into flanged bushings with wall thickness of 5 mm to 8 mm and pressed into cast iron hubs with an interference fit of 0.05 mm to 0.10 mm on diameter; this assembly method is preferred over injection molding because the conductive filler orientation around a machined bore is isotropic, whereas molded bores may develop a resin-rich insulation layer at the parting line. The bushing must maintain surface resistance below 10^9 Ω after 500 h of wheat dust accumulation at 50 % RH per IEC 60079-32-1; abrasion resistance is benchmarked after the same interval using a Taber abraser with CS-10 wheels and 500 g load per ISO 9352, though published data for this LATI grade under ISO 9352 is limited and first-article testing on the actual conveyor speed should be performed. The PA12 matrix offers low moisture absorption relative to cast nylon 6, but grain dust mixed with mineral oil from drive chains can penetrate the bushing surface and accelerate conductive filler loss at the wear interface; therefore the design should include a 0.5 mm to 1.0 mm radial clearance for dust flush-out and a PTFE lip seal if the shaft operates above 120 rpm.
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LATI Latigray 82-05 CX/90 PA 12 is a polyamide 12 compound in the Latigray family. The trade designation contains the base polymer, the grade number 82-05, and the filler-system code CX/90. The CX/90 code identifies a carbonaceous/graphitic additive package rather than a simple glass-fibre or mineral filler; the exact carbon-to-graphite ratio, total filler loading, and fibre length distribution are controlled in the producer specification and vary by production lot. The base polymer is a long-chain aliphatic polyamide with lower equilibrium moisture uptake and lower melt temperature than PA 6 or PA 66. In the Latigray range, the CX/90 modification is intended for dry-running sliding parts where graphite or carbon-based solid lubricants lower frictional heat and support transfer-film formation. The product is supplied in pellet form for injection moulding and profile extrusion. Published data for this specific configuration is limited because LATI datasheets report lot-specific mechanical, thermal, and tribological values rather than generic ranges.
In unfilled PA 12, dry sliding against a metal counterface generates adhesive wear, local surface heating, and irregular polymer transfer. The CX/90 package shifts the wear mode toward mild abrasion with a compacted solid-lubricant transfer layer. The shift is load-dependent and is not guaranteed by filler presence alone. Below the effective percolation threshold of the carbonaceous phase, loose debris remains and the coefficient of friction is dominated by polymer smearing; above percolation, graphite-rich debris forms a semi-continuous layer that reduces direct polymer–metal contact. Pin-on-disc screening under ASTM G99-17 with a ground steel countersurface is the standard method for comparing the grade against unfilled PA 12 and glass-filled PA 12. Dry-sliding coefficients of friction for graphitic PA 12 compounds are commonly reported between 0.15 and 0.35 at 1 MPa contact pressure and 0.1 m/s sliding speed; published data for this specific configuration should be confirmed on the production lot. Specific wear rate can be reduced by approximately one order of magnitude relative to unfilled PA 12 under identical screening conditions, but the relationship is not monotonic with filler content because excessive carbonaceous filler embrittles the matrix and introduces micro-cracking at the filler–polymer interface. Compounding on intermeshing co-rotating twin-screw extruders with L/D ≥ 40 is necessary to disperse the carbonaceous phase; poor distributive mixing creates black agglomerates that act as stress concentrators and lower the critical load for crack initiation.
Moisture uptake in PA 12 is lower than in PA 6 and PA 66. Under 23 °C and 50 % RH conditioning per ISO 291, unfilled PA 12 typically absorbs 0.7 % to 1.0 % moisture by mass, whereas PA 6 absorbs 2.5 % to 3.1 % and PA 66 absorbs 2.0 % to 2.8 %. In the filled compound, moisture uptake is reduced roughly in proportion to the non-hygroscopic filler volume fraction, but the polymer phase still governs dimensional change. The practical consequence is less post-moulding movement in humid or water-contact service. Components such as pneumatic manifold brackets, under-hood actuator links, and fuel-system clips can maintain tighter clearance limits when cycled between dry and moist environments. Dimensional change should be calculated from the grade-specific coefficient of hygroscopic expansion, not from moisture mass uptake alone. PA 12 also has lower unfilled density than PA 66; unfilled PA 12 density is approximately 1.01 g/cm³ per ISO 1183-1, while PA 66 is near 1.14 g/cm³. The carbonaceous filler increases density and modulus, requiring new mass and inertia estimates in dynamic applications.
When a design is constrained by dimensional tolerance stack-up rather than peak stress, PA 12-based Latigray grades offer a selection advantage over PA 6 and PA 66 compounds. The lower moisture equilibrium reduces swelling-induced clearance loss in precision sliding parts. The addition of carbonaceous filler increases tensile modulus and reduces elongation at break. Unfilled PA 12 typically shows tensile stress at yield near 35–45 MPa and elongation at break above 200 %; carbon/graphite-filled PA 12 grades of this class commonly show tensile moduli from 3,000 MPa to 8,000 MPa and elongation at break from 2 % to 8 % depending on filler loading. The Latigray 82-05 CX/90 datasheet must be consulted for exact values because the filler package is not a fixed glass-fibre fraction. Ductility reduction means snap-fit and press-fit features must be redesigned away from high-strain flexure and toward tapered guides or retention ribs. Notched impact strength is also reduced relative to unfilled PA 12; Charpy notched tests under ISO 179-1/1eA provide the appropriate screening value for sudden loading. This is an operational boundary rather than a defect: the product is intended for sliding wear surfaces, not high-strain energy absorption. Production-scale injection moulders report that carbonaceous filler raises melt pressure and screw torque, narrowing the processing window compared with unreinforced PA 12.
The compound is melted and injection moulded using standard reciprocating-screw machines with a general-purpose nylon screw, but the carbonaceous filler increases viscosity and screw-motor load relative to unfilled PA 12. Melt temperature should be maintained between 210 °C and 260 °C; the lower boundary is governed by the PA 12 melting endotherm near 170–180 °C per ISO 11357-3, and the upper boundary is limited by thermal degradation above 280 °C. Residence time at melt temperature should be held below 8 min; start-up and interruption purges should use a low-viscosity PA 12 or a commercial purging compound. Pre-drying is mandatory at 80 °C for 4–8 h in a desiccant dryer until moisture is below 0.10 % by mass, verified by ISO 15512. If plant relative humidity exceeds 60 %, closed-loop dry-air hopper loading is required because PA 12 regains surface moisture within hours. Mould temperature is typically set between 40 °C and 80 °C; higher mould temperatures improve crystallinity and reduce post-moulding shrinkage variation but increase cycle time. A mould temperature below 40 °C can produce frozen-in orientation, anisotropic shrinkage, and inconsistent tribological performance on the wear surface. Screw rotation should remain in the range 50–120 min⁻¹; higher speeds generate frictional heat that can exceed the melt temperature set point in small shot sizes. Injection speed is governed by part thickness; in wear-surface parts, a fast fill prevents premature freeze-off but may orient filler along the surface and create inhomogeneous wear behaviour at weld lines.
Rheologically, the compound exhibits shear-thinning behaviour typical of filled semi-crystalline polyamides. Melt volume-flow rate is not sufficient as a control parameter because the carbonaceous filler increases apparent viscosity at low shear. Capillary rheometry per ISO 11443 at 240 °C and shear rates from 100 s⁻¹ to 5,000 s⁻¹ is recommended for injection-moulding simulation and gate sizing. Batch-to-batch viscosity variation may arise from feedstock moisture, carbonaceous filler surface chemistry, and residual monomer content; first-in-first-out lot control and online melt-pressure monitoring are therefore required on production machines. On a twin-screw line, barrel temperatures from hopper to die are often set between 190 °C and 250 °C, with vacuum venting below -80 kPa to remove volatiles. The compound should not be processed in machines with long hot runners or unheated sprue bushes if residence time exceeds 8 min, because carbon-filled PA 12 can degrade and form black crystalline residues that contaminate subsequent batches.
Relative to glass-fibre-filled PA 12, the Latigray 82-05 CX/90 grade is formulated to reduce abrasive counterface wear and dynamic friction rather than to maximize tensile strength. Glass fibre provides stiffness and heat deflection but can score aluminium or steel shafts if filaments protrude from the sliding surface. The carbonaceous/graphitic package produces a softer solid-lubricant layer that may protect the counterface, though at some expense to tensile modulus. Glass-filled PA 12 grades often achieve tensile moduli above 6,000 MPa at 30 % glass loading; carbonaceous self-lubricating PA 12 grades of this class often fall between 3,000 MPa and 7,000 MPa depending on the carbon-to-graphite balance. The Latigray datasheet should be consulted for the exact value. Relative to molybdenum disulfide-modified PA 12, the CX/90 package avoids sulfide decomposition by-products and may provide better thermal stability of the lubricating phase during melt processing. MoS₂-modified grades can show lower friction in some dry-running steel contacts, but they may emit sulfurous odour during processing and can be less suitable for light-coloured or odour-sensitive applications. The carbonaceous route is also more likely to yield a dissipative or antistatic surface; surface resistivity should be screened under IEC 62631-3-2 if static dissipation is required. Relative to unfilled PA 12, the filled grade has higher density, higher modulus, lower elongation, and reduced wear rate, but impact toughness and spiral-flow length are reduced.
In dry-running gear trains in office automation, the compound can be selected when the design pressure–velocity is below the point at which frictional power causes surface melting of unfilled PA 12. For a spur gear module of 1.0 mm operating at 1,000 min⁻¹, the local sliding velocity at the pitch point is moderate, but intermittent operation without external lubrication requires low stick-slip to prevent noise. Filled PA 12 gears are moulded with a partially crystalline structure; mould temperature and gate location control weld-line formation because carbonaceous filler reduces weld-line strength more than unreinforced grades. In automotive window-lift slides and seat-actuator blocks, the material is used for sliding surfaces against steel or PC/ABS guides. Moisture resistance is relevant because cabin components experience high-humidity cycles; PA 12-based parts exhibit smaller dimensional change than PA 6-based slides. The grade is dark grey to black and surface finish is influenced by filler dispersion; it is not intended for appearance parts requiring paint adhesion or chrome plating. In conveyor guide rails and packaging-machine wear strips, the material can replace bronze or acetal when lubricant-free service and corrosion resistance are required, but the pressure–velocity limit must be established by block-on-ring or pin-on-disc testing rather than by extrapolation from short-term coefficient of friction data.
In industrial textile and food-processing machinery, sliding blocks, chain guides, and cam followers are commonly considered. The material is selected when metal-to-metal contact creates noise or requires external grease. However, the PA 12 base may not be suitable for immediate contact with aqueous cleaning agents at temperatures above 60 °C because hydrolysis can occur over extended exposure. In dry air or low-humidity environments, dimensions remain stable but static charge accumulation may be higher unless the CX/90 package provides sufficient surface conductivity. Cleaning validation with ISO 15883 or equivalent is required for medical or hygiene applications. End users should request migration data under EU 10/2011 if the part contacts fatty food simulants, because PA 12 can absorb lipophilic substances.
Chemical resistance follows the PA 12 matrix. The compound resists aliphatic hydrocarbons, diesel, lubricating greases, and many salt solutions; it is not recommended for continuous immersion in strong mineral acids, oxidizing acids, or polar solvents such as methanol. Environmental stress cracking resistance should be evaluated under ISO 22088-2 if the part contacts aggressive fluids. The maximum continuous use temperature depends on thermal aging conditions; UL RTI values for the specific grade should be obtained from the UL Yellow Card. Hot air aging at 150 °C for 1,000 h can reduce tensile strength by more than 20 % unless a heat-stabilized variant is specified. This grade is not intended for direct food-contact use unless the producer confirms compliance with FDA 21 CFR 177.1500 and EU 10/2011 migration limits. Electrical or electrostatic requirements must be verified separately; if surface resistivity is below 10^6 Ω/sq in the specific lot, the material may be considered dissipative under IEC 62631-3-2, but published data for this specific configuration is limited. The compound is subject to standard PA 12 drying and regrind constraints; regrind levels above 20 % by mass can shift filler orientation and lower weld-line strength unless process validation is performed.
