| HS Code | 529454 |
| Density | 1.02 g/cm³ |
| Melt Volume Flow Rate 235 C 5 Kg | 8 cm³/10 min |
| Melting Temperature | 175 °C |
| Vicat Softening Temperature B50 | 150 °C |
| Tensile Modulus 1 Mm Min | 400 MPa |
| Tensile Stress At Yield | 35 MPa |
| Tensile Strain At Yield | 20 % |
| Tensile Strain At Break | >300 % |
| Charpy Impact Strength 23 C Unnotched | No break |
| Shore D Hardness | 60 |
| Water Absorption 24h At 23 C | 0.8 % |
As an accredited Arkema Rilsamid AECV BLACK T8L PA12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | 25 kg bag of Arkema Rilsamid AECV Black T8L PA12 granules, supplied in moisture-proof polyethylene-lined paper sacks. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with Arkema Rilsamid AECV BLACK T8L PA12, palletized, secured, and protected against moisture for safe transit. |
| Shipping | Arkema Rilsamid AECV BLACK T8L PA12 is a polyamide 12 grade supplied as moisture-sensitive pellets. Ship in sealed, dry containers or original packaging to prevent moisture uptake. Store away from heat, ignition sources, and direct sunlight. No special hazardous transport requirements under normal conditions, but protect from mechanical damage during handling. |
| Storage | Store Rilsamid AECV Black T8L PA12 in its original, unopened packaging in a cool, dry, well-ventilated area away from direct sunlight, moisture, and heat sources. Keep containers tightly sealed when not in use. Avoid prolonged storage above 50°C (122°F). Under proper conditions, shelf life is typically 12 months from delivery. |
| Shelf Life | Shelf life is typically 2 years from production date when stored unopened, dry, and protected from moisture. |
Rilsamid AECV Black T8L PA12 moves into fuel vapour management molding as a pre-compounded conductive polyamide 12, processed at 100 wt% feed with 0 phr of secondary conductive masterbatch. The material enters the downstream process with carbon black already dispersed; the processor-side addition-ratio variable is regrind return, capped at 10 wt% because the conductive network is shear-sensitive and repeated melting can produce surface-resistivity divergence between thin ribs and thick bosses. Drying takes place in a desiccant-bed dryer with -40 °C dew point at 80 °C for 4–6 h, extended to 8 h when ambient relative humidity exceeds 60 %, until moisture is below 0.10 %. Moisture above this threshold produces splay on gate lands and voids at the flash surfaces of rollover valve bodies. Injection molding uses a three-zone screw with 20:1–25:1 L/D, compression ratio 2.0:1–2.5:1, and a reverse-taper shutoff nozzle; barrel temperatures are profiled from 230 °C at the feed throat to 260 °C at the nozzle. Melt temperature is held between 240 °C and 270 °C; the lower boundary prevents freeze-off in 0.8 mm snap features, and the upper boundary avoids thermal degradation that raises volume resistivity at weld lines measured under ASTM D257-14. Mold temperature is maintained at 50–70 °C because lower tool temperatures freeze the melt before carbon black orientation relaxes, producing anisotropic surface resistivity across the valve body when measured with a ring electrode under IEC 62631-3-2. Batch-to-batch variance in carbon black dispersion is monitored by recording peak injection pressure at fixed transfer position; a drift of more than 5 bar at constant melt temperature triggers a material-lot review rather than process adjustment. Terminal parts in this zone are ORVR rollover valve bodies, fill-limit valve housings, liquid/vapour separator retainers, fuel-tank sender flanges, and canister adapter fittings. The applicable external standards are SAE J1645 for fuel-system electrostatic charge, SAE J2260 for low-permeation non-metallic fuel-system components, REACH (EC 1907/2006) Annex XVII, and ISO 178:2019 for flexural verification of snap-fit retention features.
In cleanroom electronics material handling, the acceptance envelope is set by IEC 61340-5-1:2016 and ANSI/ESD S20.20-2021. Surface resistivity is measured according to IEC 62631-3-2; volume resistivity is cross-checked with ASTM D257-14. The target surface resistivity is 10^4 Ω through 10^11 Ω for static-dissipative parts, with volume resistivity of 10^4 Ω·cm through 10^11 Ω·cm when grounding is continuous. The grade is loaded at 100 wt% in the hopper; no anti-static oil, no external carbon black masterbatch, and no phthalate plasticizers are added. The critical addition-ratio failure occurs when a processor dry-blends 5 wt% or more of non-conductive PA12 to reduce cost: the melt-front boundary becomes non-conductive, and localized gate vestige surfaces rise above 10^11 Ω, creating a hidden ESD failure. Published data for this specific configuration is limited, so the only defensible control is a three-by-three surface-resistance grid on the tray floor after conditioning at 12 % RH. Hot-runner tooling with valve gates positioned away from the tray bottom is used; the melt temperature is 240–270 °C, mold temperature 50–70 °C, pack pressure 40–60 MPa, and hold time is set to a gate seal of at least 2.0 s after fill. The production bottleneck is not filling but cooling: thick boss regions retain heat and extend cycle time by 15–20 % versus unfilled PA12. Terminal products include SMT connector carrier trays, wafer cassette bodies, PCB transport totes, hard-drive carrier trays, and stacking interposers for automated assembly lines.
In explosive dust atmosphere applications, the compound is judged against ISO 80079-36:2016 for non-electrical equipment and IEC 60079-0:2017 for general explosive-atmosphere equipment, supplemented by ATEX 2014/34/EU for European market placement. The feed fraction is set at 1.00 kg/kg of supplied granules; regrind is capped at 15 wt%, and regrind dust is extracted before re-extrusion because fines create local insulative zones. Surface-resistance testing is performed at 23 °C and 12 % RH; an acceptance ceiling of 10^9 Ω is used only when the component is bonded to earth. Molded dimensions are typically above 3 mm, and the tooling is cooled with turbulent water flow to prevent hot spots that reduce bulk conductivity through carbon black network breakdown. The production route is multicavity cold-runner injection molding for dust-filter housing brackets and inspection hatch frames; large panels used in vacuum conveying elbows are extruded into plate stock and then machined, after which the machined surfaces are re-tested because cutting smears carbon black and may form an insulative skin. Terminal products are dust-filter housing brackets, inspection hatch frames, antistatic conveyor roller end caps, vacuum conveying elbows, and rotary valve cover plates.
| Application zone | Standard / test method | Measured parameter | Acceptance window |
|---|---|---|---|
| Fuel vapour management | SAE J1645, ASTM D257-14 | Electrostatic discharge, volume resistivity | OEM-defined decay threshold; resistivity below insulative range |
| ESD cleanroom trays | IEC 62631-3-2 | Surface resistivity | 10^4–10^11 Ω |
| ATEX dust components | ISO 80079-36:2016 | Ignition hazard assessment / surface resistance | ≤10^9 Ω at 12 % RH |
| Ex-rated cable glands | IEC 62444:2010 | Thread integrity / tensile load | Per IEC 62444:2010 class |
| Pneumatic push-in fittings | ISO 14743:2020 | Pressure decay / leakage | Per ISO 14743:2020 class |
Grain and powder conveyance uses the compound for rotating wear parts that must not accumulate static charge from dust contact. The processing ratio is 100 wt% as-supplied resin; regrind is added at up to 15 wt% and surface resistance is checked by ASTM D257-14 after every third production run. Injection molding is run on a 20:1 L/D screw at melt temperature 245–265 °C and mold temperature 40–60 °C. For plate stock used in chute liners, extrusion is performed on a 25:1 L/D single-screw extruder with a breaker plate and 80 mesh screen pack to remove carbon black agglomerates. Terminal product types are bucket elevator wear strips, chute liners, idler roller end caps, bearing housing covers, and dust extraction paddles. The governing standards are ISO 80079-36:2016 and EN 13463-1:2009 for non-electrical equipment in potentially explosive atmospheres.
Cable gland bodies for Ex-rated enclosures are molded from the same grade to eliminate the peeling of two-component conductive coatings under thermal cycling. The hopper feed is 100 wt% as-supplied compound; regrind is limited to 10 wt% because thin thread-root cross-sections show orientation-induced conductivity loss when regrind percentage is higher. Molding uses a 20:1 L/D injection screw, melt temperature 240–270 °C, and mold temperature 60–80 °C to hold thread dimensions for IEC 62444:2010 pull-out and impact requirements. Terminal products are Ex d/e cable gland bodies, locknuts, adaptor sleeves, and thread reducers. The applicable compliance standards are IEC 60079-0:2017, IEC 62444:2010, ISO 527-1:2019 for tensile proof of the gland body, and RoHS 2011/65/EU for restricted substance documentation.
Compressed-air distribution in classified zones places the compound in push-in fitting bodies, flow restrictors, manifold blocks, silencer housings, and pressure-switch pedestals. The raw material is used at 100 wt% feed with 0 phr additional conductive additive; cold-runner sprue regrind is kept below 10 wt% and dried together with virgin granules at 80 °C for 4 h. Production is hot-runner injection molding with polished hardened cavities; injection speed is profiled to prevent jetting at the collet lands, melt temperature is 245–265 °C, mold temperature is 50–70 °C, and sealing surfaces are checked by pressure decay after molding. The applicable standards are ISO 14743:2020 for push-in fittings, ISO 4414:2010 for pneumatic system safety, and IEC 61340-5-1:2016 for electrostatic control.
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Arkema Rilsamid AECV BLACK T8L PA12 is a black, heat- and UV-stabilized polyamide 12 extrusion compound supplied by Arkema. The grade is part of the Rilsamid PA12 family and is specified for extruded pneumatic tubing, automotive air brake lines, and low-pressure hydraulic conduits where semi-flexible, low-moisture-regain, high-toughness behaviour is required. Polyamide 12 absorbs less water than PA6 or PA66: equilibrium water uptake at 23°C and 50% RH is typically 0.7% to 0.9% by mass for PA12, whereas PA6 absorbs approximately 2.8% to 3.2% under the same conditions and greater than 9% at saturation. This lower moisture regain limits dimensional drift and mechanical-property loss in humid under-vehicle service. The “T8L” designation identifies a carbon-black-filled, UV-stabilized formulation; published data for the exact lot-to-lot variation of AECV BLACK T8L is limited, but manufacturer technical literature positions the grade for extrusion-grade tube and hose applications. End-use requirements are typically verified at component level under SAE J844, DIN 73378, or ISO 7628.
Table 1 summarizes representative published engineering data for Rilsamid AECV BLACK T8L PA12. These values are typical lot values, not release limits, and must be confirmed against the supplier certificate of analysis for each production batch.
| Property | Standard | Reported typical range |
|---|---|---|
| Density at 23°C | ISO 1183-1 | 1.01–1.03 g/cm³ |
| Melt volume-flow rate at 235°C and 2.16 kg | ISO 1133-1 | 8–15 cm³/10 min |
| Tensile modulus | ISO 527-1/-2 | 420–480 MPa |
| Yield stress | ISO 527-1/-2 | 20–25 MPa |
| Nominal strain at break | ISO 527-1/-2 | >300% |
| Charpy notched impact at 23°C | ISO 179-1/1eA | 6–10 kJ/m² |
| Charpy notched impact at −30°C | ISO 179-1/1eA | 4–6 kJ/m² |
| Melting temperature by DSC | ISO 11357-1/-3 | 174–177°C |
| Vicat softening temperature | ISO 306/B50 | 142–148°C |
| Shore D hardness | ISO 868 | 52–58 |
The tensile elongation above 300% is reported for dry-as-moulded specimens tested at 23°C under ISO 527-1/-2; after conditioning at 50% RH, the modulus usually decreases and elongation may increase. Melt volume-flow rate is sensitive to moisture and temperature; low values support thick-wall tube extrusion, while higher values improve injection moulding fill.
Before any melt processing operation, moisture control is the first technical barrier. The resin must be dried to a residual moisture content below 0.10% by mass. Hot-air drying at 80°C for 4–6 hours is acceptable when ambient relative humidity remains below 60%; above that threshold, desiccant drying with a dew point below −30°C is required. Undried pellets produce hydrolysis-induced silver streaks, diameter pulsation in extruded tube, and reduced burst-pressure retention. Single-screw extrusion is typically performed on a 24:1 to 30:1 L/D extruder with a three-zone compression screw. Barrel set temperatures from feed to metering are commonly 210°C, 230°C, 240°C, and 245°C, while the die and adaptor are held between 235°C and 245°C. Melt temperature measured at the die entry should remain between 230°C and 250°C. In injection moulding, the melt temperature is typically set at 240°C to 260°C, mould temperature at 40°C to 80°C, and screw back pressure below 0.5 MPa. A vacuum calibration tank at 20°C to 40°C is typical for tube production; rapid quenching reduces crystallinity and increases flexibility, while slow cooling can raise modulus and moisture uptake.
| Parameter | Condition | Range |
|---|---|---|
| Residual moisture | Before processing | <0.10% |
| Hot-air drying | At ambient RH below 60% | 80°C for 4–6 h |
| Desiccant drying dew point | At ambient RH above 60% | <−30°C |
| Extrusion melt temperature | Die entry measurement | 230–250°C |
| Injection moulding melt temperature | Nozzle | 240–260°C |
| Mould temperature | Injection moulding | 40–80°C |
| Extruder L/D | Single-screw | 24:1–30:1 |
Thermal degradation of Rilsamid AECV BLACK T8L PA12 becomes measurable when the melt temperature at the die exceeds 250°C. Because carbon black raises absorptivity, the melt surface temperature can rise 5–10°C above the barrel set point in high-shear zones. Thermo-oxidative chain scission reduces melt viscosity, narrows the processing window, and generates low-molecular-weight fractions that migrate to the tube surface. At residence times above 6 min, molecular weight distribution broadens; die swell becomes unstable, and weld-line or surface defects appear. A gear pump upstream of the die stabilises output when screen-pack pressure drop exceeds 1.5 MPa. With a 20 µm woven screen pack, pressure drop should not exceed 3 MPa; higher differential pressure indicates carbon black agglomeration or degraded gel accumulation. Capillary rheometry under ISO 11443 at 240°C is used to verify the apparent viscosity at 100 s⁻¹. If the value falls outside the medium-viscosity envelope of approximately 300–600 Pa·s, thermal damage should be suspected. The extrusion melt-temperature window is therefore maintained within ±5°C of 245°C. Excursions beyond 260°C for more than 10 min can cause irreversible loss of elongation and surface yellowing. In injection moulding, residence time should remain below 8 min for shot sizes below 60% of barrel capacity.
When automotive air brake tubing is produced from this grade, burst pressure, cold impact, salt-spray exposure, and heat-aging tests govern acceptance. Extruded tubing is typically produced at outer diameters from 6 mm to 16 mm and wall thicknesses from 1 mm to 2 mm. Burst-pressure values vary with diameter and wall ratio, so no single value is stated here. Unfilled PA12 tubing of comparable dimensions is generally rated for working pressures above 1.0 MPa at ambient temperature, with failure often initiated at the fitting insertion point rather than in the tube wall. Low-temperature impact is verified under ISO 179-1/1eA at −30°C or by component-level cold burst tests; the material retains notched impact strength above 4 kJ/m² in the dry state. Hot-air aging at 100°C for 1000 h under ISO 188 is used to screen oxidative stability; retention of more than 50% of original elongation is considered robust for truck air brake service. Immersion testing based on ISO 1817 in diesel, lubricating oil, and salt solutions demonstrates the PA12 chemistry’s resistance to zinc chloride and calcium chloride, which attack PA6 and PA66 more aggressively.
Selection of Rilsamid AECV BLACK T8L over a natural Rilsamid PA12 grade or a glass-filled variant is based on measurable differences in flexibility, weathering resistance, and extrusion stability. Compared with a standard unfilled medium-viscosity PA12 extrusion grade, the AECV designation is associated with Shore D hardness of approximately 52–58 under ISO 868 and tensile elongation above 300% under ISO 527-1/-2, which permits tighter bend radii without kinking. The carbon black in the T8L formulation provides accelerated weathering resistance; natural PA12 exhibits more pronounced surface cracking after xenon-arc exposure under ISO 4892-2. Glass-filled PA12 grades with nominal 20% glass fibre have tensile modulus values above 2000 MPa, but elongation at break is typically below 10%, making them unsuitable for small-diameter dynamic pneumatic line. The AECV grade has higher melt strength than injection-moulding PA12, which is required for vacuum calibration of tube; the higher viscosity may require greater screw torque, but published data for the exact load difference between AECV and lower-viscosity grades is limited.
For regulatory compliance, the status of the grade is supply-chain-specific. The resin is expected to comply with REACH and RoHS for automotive and industrial use; however, a component certificate must be requested for each production batch. The black T8L grade is not normally promoted as a food-contact material; if migration limits under EU 10/2011 are required, the finished article must be tested because carbon black and processing aids can affect specific migration. Incompatibility with concentrated formic acid, phenols, resorcinol, and certain chlorinated solvents should be assumed; PA12 may swell or degrade in these media. Blending with amine-rich color concentrates or uncapped polyamide oligomers should be avoided because such additions can accelerate chain scission during melt processing. Storage in sealed containers below 30°C and below 60% RH is recommended to preserve drying efficiency and prevent moisture regain during silo storage.
