| HS Code | 289959 |
| Density | 0.91 g/cm³ |
| Melt Flow Rate 230 C 2 16 Kg | 22 g/10 min |
| Tensile Strength At Yield | 17 MPa |
| Elongation At Break | >100% |
| Flexural Modulus 1 Secant | 900 MPa |
| Izod Impact Notched 23 C | 10 kJ/m² |
| Izod Impact Notched 30 C | 5 kJ/m² |
| Hardness Shore D | 65 |
| Heat Deflection Temperature 0 45 Mpa | 80 °C |
| Vicat Softening Temperature A50 | 130 °C |
| Mold Shrinkage Flow Direction | 1.2 % |
| Mold Shrinkage Transverse Direction | 1.4 % |
As an accredited Hifax TKC 2206X BLACK PP Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Hifax TKC 2206X BLACK PP Copolymer is supplied as black pellets in 25 kg bags, shrink-wrapped on pallets for safe transport. |
| Container Loading (20′ FCL) | 20′ FCL loading of Hifax TKC 2206X Black PP Copolymer: 20-foot full container, palletized, secured for safe transport. |
| Shipping | Hifax TKC 2206X Black PP Copolymer ships as solid polypropylene pellets in sealed moisture-resistant bags or bulk containers. It is non-hazardous under normal transport, but keep dry, avoid direct sunlight and high temperatures, and protect bags from tearing during handling. |
| Storage | Store Hifax TKC 2206X BLACK PP Copolymer in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly closed when not in use to prevent contamination and moisture pickup. Protect bags from punctures and mechanical damage. Avoid generating dust and store at ambient temperature, separated from oxidizing agents. |
| Shelf Life | Shelf life is typically 12 months from delivery if stored in original, unopened packaging away from heat, moisture, and sunlight. |
Large-tone fascia tooling imposes a flow-length-to-wall-thickness ratio that rapidly separates melt-front progress from hold-pressure response. In lower front bumper inserts and rear lower fascia sections molded from Hifax TKC 2206X black PP copolymer, the processing window is controlled by the balance between low-temperature impact retention and thin-wall fill capability. The injection shop should document lot MFR under ISO 1133-1:2022 at 230 °C and 2.16 kg before introducing the material into a hot-runner manifold, because a batch MFR shift greater than ±3 g/10 min relative to withdrawal approval changes gate shear heating and moves the frost line inside the cavity. Regulatory compliance for exterior plastic lower trims typically draws on ISO 179-1:2010 for notched Charpy impact at -30 °C, ISO 527-2:2012 for tensile properties, and ISO 4892-2:2013 for xenon-arc weathering; many OEM material specifications add stone-impact and chemical resistance requirements following internal test procedures, whereas REACH and RoHS 2011/65/EU declarations remain mandatory for export. The material is pre-coloured black, so an additional carbon black masterbatch is not used; the relevant addition ratio is closed-loop regrind fraction, which should be held at 15–20 wt% of granulated sprue, runner, and rejected unfilled parts, with fines below 5 wt% of total granulate. Regrind above 25 wt% is not recommended for cold-impact-exposed fascia because the homogenized stabilizer package and impact-modifier domain size cannot be assumed unchanged from the virgin state. Processing on hydraulic or hydro-mechanical presses with clamp force from 2,000 t to 3,000 t uses sequential valve-gate hot-runner actuation to avoid weld lines in the lower grille region. The nozzle melt temperature is maintained at 220–245 °C, while mold wall temperature is set to 30–50 °C; injection speed is profiled so that initial filling velocity is high enough to prevent premature freeze-off, then ramped down before final cavity pressure exceeds the threshold for flash at shut-off faces. Hold pressure is typically 35–50 % of peak injection pressure and is terminated only after gate freeze is confirmed by part weight stability; cooling time is referenced to 90 % solidification on the pressure-volume-temperature curve. End-product configurations include front lower bumper inserts, rear lower fascia, tow-eye cover supports, and license plate recess frames.
A rocker panel molding does not fail primarily in single-notch mode; it experiences biaxial impact from stone spray, curb abrasion, and cold impact along the sill line. Because Hifax TKC 2206X black PP copolymer is supplied ready to mold, the compounding line is bypassed, and the formulation addition ratio on the production floor becomes the reprocessed core fraction in two-layer co-injection. In exposed rocker panel and side sill applications, a monolayer construction should not exceed 10 wt% closed-loop regrind if grain depth and weathering stabilizer retention are critical; in a core-skin co-injection configuration, up to 30 wt% of reprocessed black PP from the same lot is confined to the core layer while the skin remains 100 % virgin to preserve surface grain replication and the full UV-stabilized surface film. Weathering is validated under ISO 4892-2:2013 Method A cycle 1 with a radiant exposure commonly specified between 1,500 kJ/m² and 2,500 kJ/m² at 340 nm depending on OEM exterior plastic standards, followed by a ΔE limit of 3.0 against an unexposed control; mechanical acceptance is based on ISO 527-2:2012 tensile elongation at break and ISO 179-1:2010 notched Charpy at -30 °C. Processing uses a co-injection or mono-sandwich injection molding line with a shut-off gate design; the mold texture is typically acid-etched at 25–40 µm to hide micro-scratches, and tool steel surfaces are kept at 30–50 °C. Melt temperature at the nozzle is 230–250 °C, and fill speed is set to prevent jetting at the drop gate, because a high-speed unexpanded melt thread can snake into the cavity and create a visible low-gloss streak along the rocker panel. Hold-pressure decay at long flow lengths exceeding 900 mm requires pressure sensors at the far gate; if cavity pressure at end of fill falls below 80 % of the entry value, gate freezing time is extended before screw rotation. In-house recompounding on a co-rotating twin-screw extruder with L/D 40:1 is not required and can shift the impact-modifier domain size; if reprocessed material is pelletized, it should be done on a single-screw reclaim line with low shear and melt temperature below 230 °C. Terminated parts include rocker panel moldings, side sill extensions, lower door claddings, and stone-deflection lips attached to the sill beam.
| Test/Requirement | Standard or Code | Condition | Reference Value Basis |
|---|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 | 230 °C, 2.16 kg | Supplier datasheet |
| Notched Charpy impact | ISO 179-1:2010 | 23 °C and -30 °C | OEM material specification |
| Tensile properties | ISO 527-2:2012 | Type 1A, 50 mm/min | Supplier datasheet |
| Instrumented puncture impact | ISO 6603-2:2000 | -30 °C | OEM validation protocol |
| Xenon-arc weathering | ISO 4892-2:2013 | Method A cycle 1, 340 nm | OEM ΔE limit |
| Mold shrinkage | ISO 294-4:2018 | 48 h at 23 °C, 50 % RH | Supplier datasheet |
| Article-level declarations | REACH, RoHS 2011/65/EU | Finished article | Per shipment documentation |
The puncture performance of a wheel arch liner cannot be inferred from a single Charpy value because a stone impact occurs at elevated strain rate, under biaxial loading, and frequently near a molded-in rib intersection. In wheel arch liners and fender spats produced from Hifax TKC 2206X black PP copolymer, lot release should include ISO 6603-2:2000 instrumented puncture tests at -30 °C, with the force-deflection trace examined for unstable crack propagation, not only for absorbed energy. The standard set also includes ISO 179-1:2010 notched Charpy at 23 °C and -30 °C, ISO 527-2:2012 tensile tests, and ISO 4892-2:2013 weathering if the part is visible from the wheel opening at rest. The formulation addition ratio for regrind is 25 wt% maximum and only when the grinder knife gap is maintained below 0.3 mm, because fine polyethylene-rich powder from mixed scrap changes local melt viscosity and creates surface pits or microporosity behind the injection gate. The downstream process is injection molding with large projected area and relatively thin ribs; the mold should avoid sharp rib-to-wall tangencies because the notch geometry induces premature cold failure at the base of the wheel arch liner. Rib bases are radiused to 1.5–2.0 mm and are arranged perpendicular to the main flow path only after mold-filling simulation confirms no trapped air. Melt temperature is set at 225–245 °C, while cooling circuit design targets a uniform mold wall temperature of 30–45 °C; differential shrinkage across a deep draw of the liner must be corrected by pack-pressure profiling rather than by increasing melt temperature above 250 °C. Adding mineral-filled PP scrap is incompatible with this part class because the local modulus mismatch at the interface between filled regrind and unfilled virgin matrix creates an early crack path under high-rate puncture. End-products include front and rear wheel arch liners, fender spats, stone deflectors, and splash panels integrated behind bumper corners.
In upper-cowl and plenum locations, dimensional tolerance is dictated by clip retention and wiper-system sealing rather than by visual gloss. Hifax TKC 2206X black PP copolymer must fill long thin channels around windshield support brackets without warping the part after ejection; therefore the acceptance criteria include ISO 294-4:2018 shrinkage measured after 48 h at 23 °C and 50 % relative humidity, and ISO 75-2:2013 heat deflection temperature at 0.45 MPa for body-in-white bake or solar soak conditions. For high-temperature exposure, ISO 188-based heat-aging is applied by OEM specifications rather than as a stand-alone pass/fail; the part must retain clip engagement after 1,000 h at 120 °C when specified by the platform. The addition ratio of reprocessed material is restricted to 5 wt% maximum in cowl vent grilles and plenum covers, and only when the reprocessed material is free of glass-filled PP fragments from other production cells; a single glass-fiber cluster in the melt stream is sufficient to clog a 0.8 mm gate land and produce an incomplete fill in the vent slot array. Processing uses an injection-molding machine with sufficient dosing precision for shot-to-shot mass variation below 0.3 %, because the thin louvers of a cowl grille magnify filled volume deviations as visible spacing error. Melt temperature is maintained at 220–240 °C, the mold is set at 30–45 °C, and pack pressure is applied through a short gate land to freeze quickly before screw rotation; premature screw rotation pulls molten polymer backward from the cavity and produces sink marks at the louver roots. End-products are cowl vent grilles, plenum chamber water deflectors, wiper motor cover supports, and end-caps that surround the windshield base.
The dominant difficulty in high-gloss D-pillar appliqués is sink formation at the backside rib anchor points and gloss variation along the flow front. For Hifax TKC 2206X black PP copolymer in exterior vertical trim, the compliance package is defined by ISO 294-4:2018 for shrinkage, ISO 4892-2:2013 for weatherability, ISO 1133-1:2022 for melt-flow stability, and ISO 2813:2014 gloss measurement; exterior gloss limits for high-gloss black applications often require gloss at 20° geometry above 85 GU on the Class A surface. The formulation addition ratio is effectively 0 wt% for external carbon black or masterbatch because the material is supplied pre-coloured black; introducing 1–2 wt% of a generic black masterbatch into the hopper changes the surface gloss and creates visible streaks from incomplete distributive mixing. If post-industrial reprocessed material is used in the same part, it should be limited to 5 wt% and only in non-appearance regions through a core-skin feed system, because minuscule color mismatch is visible on a polished D-pillar surface under side light. If the material is brought from cold storage into a warm molding hall with relative humidity above 60 %, surface condensation on pellets must be removed by pre-drying at 80 °C for 2–4 h before molding high-gloss surfaces. The downstream process is injection molding with an indirect gate that impinges on the hidden side of the part or a hot-tip gate behind the pillar location; the mold surface is maintained at SPI A1 or equivalent with surface temperature variation across the cavity of no more than 5 °C. Melt temperature is 235–250 °C to permit gloss replication from the polished steel, while pack pressure is raised early to 60–80 % of peak injection pressure before the gate freezes; cooling time is extended until the part surface temperature falls below 70 °C before ejection to minimize sink and post-mold dimpling. Backside attachment ribs follow a rib-to-wall ratio not exceeding 0.5:1, and any thicker boss is cored from the back to reduce localized mass. Tagged part types include D-pillar upper appliqués, liftgate garnish surroundings, roof ditch moldings, and body-color black trim on rear quarter windows.
When underbody panels are bolted at multiple points and exposed to radiated road heat, creep at the compression limiter boss controls the clamp load over vehicle life. Hifax TKC 2206X black PP copolymer is evaluated for underbody aerodynamic covers only where the part is not continuously wetted by hot engine oil and not exposed to direct exhaust impingement; local skin temperatures above 85 °C require a heat-shield sleeve or a metallic insert. The compliance basis for hidden structural covers includes ISO 527-2:2012 tensile modulus and yield stress, ISO 75-2:2013 heat deflection temperature at 0.45 MPa, ISO 6603-2:2000 multi-axial puncture for stone ejection, and ISO 1183-1:2019 density for mass tracking; supply chain declarations are aligned with REACH and RoHS 2011/65/EU. The addition ratio of post-industrial regrind in underbody covers may be increased to 30 wt% when the regrind source is segregated to black unfilled polypropylene from the same product family, because surface appearance requirements are lower than in exterior vertical panels. Post-consumer recyclate or unknown mixed PP scrap is not substituted without full lot testing under ISO 6603-2:2000 at -30 °C and ISO 1133-1:2022 melt-flow analysis, since oil-absorbed fines from mixed origins shift the melt flow and can reduce impact resistance near molded-in metal inserts. The production process is large-area injection molding with accumulator-assisted injection units and clamp force between 1,200 t and 2,200 t; melt temperature is 220–240 °C, mold temperature 30–50 °C, and fill speed is set high enough to avoid premature freeze-off but low enough to prevent flash along multi-drop edges. Compression limiter bosses are gated with center injection through a cold runner block, and the metal inserts are preheated to 80–100 °C to reduce differential contraction cracking. Published data for this exact molded configuration is limited; validation must be run on the production tool with the actual bolt spacing and insert geometry. End-products include engine splash shields, transmission lower covers, and floor underbody aero panels with integrated service access flaps.
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In the landscape of mineral-reinforced polypropylene compounds for exterior automotive applications, Hifax TKC 2206X BLACK occupies a distinct node between high-flow processability and low-temperature impact integrity. It is a heterophasic ethylene-propylene copolymer modified with a proprietary blend of elastomeric domains and a lamellar alkaline earth mineral filler at approximately 20 wt%, according to compositional analyses typically disclosed for the Hifax series. The grade enters the process stream pre-pigmented with a fully compounded carbon black masterbatch, eliminating the need for in-line liquid colour addition and the associated variance in dispersion quality. Melt volume-flow rate, as measured per ISO 1133-1:2022 at 230°C and 2.16 kg, falls within the 18–25 cm³/10 min corridor, placing it among the medium-high fluidity TPO materials suited for long flow-length, thin-wall geometries. Direct published data for the exact TKC 2206X formulation remain limited; the performance boundaries discussed herein draw from parallel Hifax grades and from the broader class of impact-modified, mineral-filled PP copolymers validated on production-scale injection moulding systems of 800 to 1,600 metric tons clamping force.
Thin-wall exterior trim—rocker panels, lower bumper stiffeners, wheel-arch extensions—demands a melt that resists premature freeze-off without sacrificing stiffness or dimensional fidelity. On a 1,200-ton toggle-clamp machine running a single-cavity fascia tool, melt temperatures are typically sustained between 220°C and 250°C, with hot-runner manifold set-points stabilized to ±2°C across all nozzles. At wall stocks of 1.8 mm and flow- length-to-thickness ratios exceeding 250:1, the compound’s pronounced shear-thinning behaviour becomes the primary enabler of full cavitation. Capillary rheology data from analogous TPOs indicate a power-law index of approximately 0.32–0.38 at the typical melt-processing temperature, which translates into a steep pressure-drop reduction when injection velocities push above 80 mm/s. The processing window, however, narrows sharply: if cavity wall shear rate exceeds 15,000 s⁻¹, the elastomeric phase can undergo localised viscous heating and subsequent micro-delamination at the mineral-polymer interface, visible as silver streaking parallel to flow. Production-scale trials have identified a safe upper envelope at 120 mm/s linear injection speed for gate diameters over 2.5 mm; with pin-point gates smaller than 1.8 mm, jetting becomes the dominant defect unless melt temperature is raised to 245°C, at which point oxidative degradation of the unstabilised ethylene-rich tails may begin within 12 seconds of residence time above the threshold. Holding pressure profiles are typically configured with a step-down gradient from 55 MPa to 25 MPa hydraulic pressure over 6 seconds to offset differential shrinkage while avoiding overpacking-induced warpage at the gate pucker region. Mould temperature, maintained at 35°C–50°C via turbulent-flow water circuits, promotes a frozen skin layer that assists pigment encapsulation; operators report that a drop below 30°C can introduce a matte surface hetereogeneity under oblique lighting due to differential carbon-black agglomeration in the shear field.
The compound’s linear mould shrinkage—recorded per ISO 294-4 on 60×60×2 mm plaques with end-gated injection—is typically 0.9%–1.1% parallel-to-flow and 1.0%–1.3% transverse, values that align with a mineral fraction that disrupts polypropylene’s inherent post-crystallisation contraction. This anisotropy, if ignored during tool-cut compensation, leads to gap-and-flush mismatches exceeding 0.4 mm on assembly lines where body-side datum tolerances are held to ±0.5 mm. Therefore, tooling adjustments are integrated into the pre-series dimensional maturation loops, not post-hoc.
Unfilled random PP copolymers with equivalent room-temperature impact resistance frequently exhibit a flexural modulus below 1,200 MPa (ISO 178) and retain only 30–40% of that stiffness at 80°C, the paint-oven temperature. The mineral phase in Hifax TKC 2206X BLACK shifts the mechanical profile into a domain accessible otherwise only through more expensive engineering thermoplastics. Published data for comparable Hifax compounds place the flexural modulus at 1,700–2,100 MPa, with the tensile yield stress (ISO 527-2, 50 mm/min) near 24–26 MPa. The offset is not merely stiffness; the filler network also depresses the coefficient of linear thermal expansion (CLTE, ISO 11359-2, −30 to +100°C range) to approximately 55–65 µm/m·°C, compared with 90–110 µm/m·°C for unfilled PP, reducing thermal cycling stress at bolted fastening points. Charpy notched impact strength (ISO 179-1/1eA) at 23°C is kept above 30 kJ/m², though at −30°C it may decline to 4–6 kJ/m², a ductile-to-brittle transition that is partly mitigated by the ethylene-propylene copolymer matrix’s sub-ambient glass transition. The table below contrasts critical property bands with those of a standard unfilled impact copolymer (PP-copo) at the same melt flow classification.
| Property | Test Standard | Hifax TKC 2206X BLACK (typical range) | Unfilled PP Impact Copolymer (typical range) |
|---|---|---|---|
| Melt Volume-Flow Rate | ISO 1133-1 (230°C, 2.16 kg) | 18–25 cm³/10 min | 18–24 cm³/10 min |
| Density | ISO 1183-1 | 1.05–1.08 g/cm³ | 0.90–0.91 g/cm³ |
| Flexural Modulus | ISO 178 | 1,700–2,100 MPa | 1,000–1,300 MPa |
| Tensile Yield Stress | ISO 527-2 (50 mm/min) | 24–26 MPa | 22–25 MPa |
| Charpy Notched Impact 23°C | ISO 179-1/1eA | 30–40 kJ/m² | 35–50 kJ/m² |
| Charpy Notched Impact −30°C | ISO 179-1/1eA | 4–6 kJ/m² | 6–10 kJ/m² |
| CLTE (−30 to +100°C) | ISO 11359-2 | 55–65 µm/m·°C | 90–110 µm/m·°C |
A secondary operational consequence emerges in fastening and welding. The increased modulus and mineral content raise the thermal conductivity modestly, which can cool hot-plate welded joints faster by 1.5–2.0 seconds versus unfilled grades, requiring tighter weld-cycle control. In ultrasonic welding, the stiffened matrix transmits vibrational energy more efficiently but also narrows the amplitude window before cavitation damage appears at mineral-matrix interfaces.
The elimination of an in-line painting stage for non-visible Class-B or Class-C exterior trim removes volatile organic compound emissions, capital investment in a paint line, and the cycle-time penalty of a separate coating and curing step. The carbon-black package in TKC 2206X is pre-dispersed at the compounding stage, typically via a side-fed masterbatch with a carbon-black concentration of 35–45% on a LDPE carrier, achieving a final gravimetric loading of approximately 2.2–2.8 wt% in the pellet. Accelerated weathering per SAE J2412 (xenon-arc, 0.55 W/m² at 340 nm, continuous light) with black-standard temperature 70°C has been applied to similar Hifax black TPO formulations; after 2,500 kJ/m², tensile elongation at break retention typically exceeds 85% provided the carbon-black primary particle size remains below 25 nm and dispersion quality measured by optical microscopy shows no agglomerate larger than 12 µm. If agglomerates exceed that threshold, surface chalking and a delta E colour shift beyond 1.2 CIELAB units emerge within 1,200 hours of exposure.
On the production floor, colour consistency between extrusion lots is monitored with an integrating sphere spectrophotometer under D65/10° conditions; a batch-to-batch delta E of less than 0.5 is sustained through gravimetric feeder accuracy of ±0.3% on the masterbatch additive stream. A limitation arises when full-colour matching is required: the grade is supplied only in black, and any attempt to dry-blend with an organic pigment masterbatch risks partial agglomeration that attenuates impact strength at weld lines by 15–20%. Additionally, the uncoated surface, while durable against UV and moisture, lacks the high-gloss distinctness-of-image needed for Class-A body-colour surfaces; a textured or grained tool finish is the recommended approach to cosmetically manage flow lines and minimise visible scratch whitening.
Pre-drying is mandatory when pellet moisture content exceeds 0.08% by weight: 2–4 hours at 80°C in a desiccant-bed dryer with a dew point below −30°C, verified by a Karl Fischer titrator at material change-over.
In multi-gated fill patterns for radiator grille surrounds or rear spoiler substructures, converging melt fronts carry a history of shear and thermal profile that directly affects the mechanical soundness of the weld region. With mineral-filled TPOs, the near-weld morphology shows a platelet-depleted zone with elongated elastomer domains oriented perpendicular to the flow direction, a structure that becomes the weak link under impact. On a 1,600-ton machine running a sequential valve-gate manifold, probes inserted in the runner reported temperature variations of up to 12°C between the first and last gate to open. If the cooler front arrives below 215°C, the weld line Charpy impact measured on cut specimens (ISO 179-1, weld at centre) drops below 12 kJ/m²—a 60% reduction from the bulk value. Mitigation strategies include sizing the hot-runner channels to impose a shear-heating effect that compensates for transit-time cooling, and programming a short (0.2–0.5 s) melt decompression before valve actuation to suppress cold-slug formation. Published data for this specific grade’s weld-line flow length under sequential gating has not been disclosed, but comparable data from equivalent talc-filled TPOs indicate that a temperature delta > 8°C at the confluence is the inflection point for brittle failure.
Material-handling protocols must exclude zinc stearate, calcium stearate, and other metallic carboxylates used as lubricants in upstream equipment when processing TKC 2206X BLACK. At melt temperatures exceeding 230°C, these additives catalyse oxidative chain scission preferentially in the ethylene-propylene rubber phase, generating free radical species that discolour the carbon-black pigmented matrix to a cloudy grey-black within 30 minutes of residence time. Simultaneously, the acid-neutralising capability of the stearates attacks the acidic surface treatment on the mineral filler, releasing Ca²⁺ ions that can nucleate uncontrolled beta-crystal formation and subsequent shrinkage anisotropy. Trials on single-screw extruders with 25:1 L/D at 60 rpm confirm that even 0.1 wt% of carry-over zinc stearate from a previous PVC run can elevate melt pressure instability and cause surging of ±5 bar at the screw tip. Dedicated screws, barrel coatings, and a minimum 30-minute purging with a high-viscosity polyethylene cleaning compound at 240°C are required before introducing the TPO feed.
On the same topic, regrind usage is permitted up to 20% by weight of the shot size without re-stabilisation, provided that the regrind is sourced from a closed-loop system with no contamination and that its melt flow rate drift is less than 3 cm³/10 min compared with virgin pellets. When injection operators increase regrind content beyond that ratio, notched impact at −20°C can drop by approximately 25%, an effect traceable to cumulative thermal history degrading the ethylene segments in the copolymer.
Substantiation of regulatory compliance is summarised in the matrix below, which lists the standards frequently referenced during material qualification for global automotive platforms.
| Regulation / Standard | Typical Status for Hifax TKC 2206X BLACK | Applicable Clause / Method |
|---|---|---|
| EU End-of-Life Vehicles Directive 2000/53/EC | Compliant; no intentionally added heavy metals (Pb, Cd, Hg, Cr6+) | Annex II exemption review, recast 2022 |
| REACH (EC 1907/2006) | No SVHC above 0.1% w/w for candidate list substances as of latest update | Article 33, Annex XVII |
| RoHS 2011/65/EU (recast) | Within prohibited substance limits for non-exempted categories | Annex II, Category 11 (if applicable) |
| IMDS / GADSL | Registered; contains carbon black, mineral filler, PP copolymer, stabilisers | IMDS Recommendation 019 |
| ISO 14021 recycled content claims | Not applicable; no post-consumer recyclate incorporated | Section 7, self-declared environmental claims |
| UL 94 flame classification | HB (3.0 mm thickness), typical of mineral-filled PP | Section 8, horizontal burn test |
| FDA 21 CFR 177.1520 | Olefin polymer specification; must be verified per specific use conditions | Subpart D for PP copolymer |
In cowl vent grilles and interior substructures, structure-borne noise transmits through the body-in-white into the passenger compartment. The mineral platelets in TKC 2206X exhibit an aspect ratio of approximately 5:1 to 10:1, as determined by scanning electron microscopy of cryofractured specimens. This plate morphology introduces energy-dissipating friction at the matrix-filler interface under cyclic deformation, shifting the tan delta peak (measured via DMA in tensile mode at 1 Hz) toward +5°C relative to the unfilled copolymer. The result, documented on comparable Hifax grades in a laboratory study published by the manufacturer’s technical centre, is a 2–3 dB (A) sound-pressure reduction in a panel resonance test at 200–500 Hz compared with an unfilled TPO panel of similar mass. Production-scale NVH validation, however, remains component-specific, and the exact contribution of the mineral network in the TKC 2206X variant has not been isolated in a peer-reviewed publication.
The economic calculus favours this grade when the cumulative cost of a separate primer, basecoat, and clearcoat application is removed from B-surface trim, provided that the tool texture is engineered to hide flow marks and that the processing boundary conditions described in the thin-wall injection scenario are maintained without deviation. Without adherence to the prescribed drying, shear-rate, and temperature windows, the yield of parts that pass both dimensional audit and post-moulding impact test can decline to below 85% on a #4 cavity tool, erasing the material-cost advantage.
