Thin-wall automotive interior trim demands a narrow injection window for high-flow ABS

TERLURAN 978T is specified for automotive interior components where melt flow under ISO 1133-1:2022 test conditions permits filling of ribs and bosses with nominal wall thickness 1.8–2.4 mm without exceeding a melt temperature of 250 °C. Compliance documentation for instrument panel surrounds and door trim inserts in passenger vehicles references FMVSS 302 and ISO 3795 for horizontal burn rate; the specification is typically a burn rate not exceeding 100 mm/min for interior materials. Volatile organic compound and fogging requirements are evaluated under VDA 277 and VDA 278. Raw material declarations are checked against REACH Annex XVII and RoHS 2011/65/EU substance restrictions. In the dosing stage, the granulate is blended as 100 kg virgin resin with 2.0–3.0 kg ABS-carrier black masterbatch and 10–15 kg closed-loop in-plant regrind; regrind loading above 20 wt% is not recommended because particle-size heterogeneity produces melt-pressure oscillation in the metering zone. Drying is executed in a desiccant dryer at 80 °C for 2–4 h to achieve residual moisture below 0.05%. The production process is injection moulding with a clamp force derived from projected area; a multi-cavity tool with 1,200–1,500 kN clamping per cavity is typically used. Screws with 20:1–25:1 L/D and a compression ratio of 2.0:1–2.5:1 are selected; melt temperature is held at 230–250 °C, and the mould surface is maintained at 40–60 °C for high gloss. Injection speed is profiled so that shear rate at the gate does not exceed 30,000 s⁻¹, above which surface splay and visible gate blush appear. Terminal component types include instrument cluster bezels, door pull surrounds, HVAC vent vanes, steering column covers, and centre console side panels.

For consumer electronics enclosures with nominal wall thickness 1.2–2.0 mm, the selection of TERLURAN 978T is driven by a balance between high injection fluidity and the ability to withstand repeated drop impacts after assembly. Compliance is documented under IEC 62368-1 for audio/video and information-communication equipment safety, including reduced-risk ignition sources; unfilled ABS is typically classified HB under UL 94, so any application requiring V-0 must substitute a flame-retardant ABS grade rather than relying on additive masterbatches. Substance compliance follows RoHS 2011/65/EU Annex II with limits of 1000 ppm lead, 1000 ppm mercury, 100 ppm cadmium, 1000 ppm hexavalent chromium, and 1000 ppm for PBB and PBDE. The addition ratio is typically 100 parts granulate with 1.5–2.0 parts of metallic-effect masterbatch using an ABS-compatible carrier; polyolefin-carrier masterbatches are excluded because immiscibility at the gate results in delamination streaks. Moulding is performed on a reciprocating-screw injection machine with 20:1 L/D plastication unit, screw back-pressure 5–10 bar, and melt temperature 225–245 °C. The tool temperature is held between 50 °C and 70 °C. Thin-wall filling is sequenced with a high-speed injection profile and a short hold-pressure decay to avoid jetting; hot-runner valve gates are used when gate vestige on visible surfaces must be controlled. Terminal parts include router and smart-speaker shells, Bluetooth speaker enclosures, remote-control housings, and laptop bottom covers where the material is not used as a structural chassis component.

When does regrind addition alter notched impact response in appliance housings?

Appliance housings such as dehumidifier shrouds and air-purifier frames are moulded with thicker ribs and bosses, which makes regrind strategies a central technical variable. Compliance under IEC 60335-1 requires glow-wire flammability testing according to IEC 60695-2-11; for unattended appliances with connections exceeding 0.2 A, the end product must withstand 650 °C for 30 s or comply with IEC 60695-2-12 flame spread limits depending on the construction. Because unfilled ABS is normally HB, TERLURAN 978T is limited to lower-current, attended, or non-charging enclosures; any end product requiring 650 °C glow-wire resistance at the enclosure surface requires a flame-retardant ABS grade. Electrical safety, creepage distances, and material compatibility are reviewed under the appliance standard and RoHS 2011/65/EU. The addition ratio for first-generation reprocessing is 15–20 wt% in-plant regrind blended with 80–85 wt% virgin granulate; when colour changes are frequent, the regrind content is reduced to 10 wt% because layered colour contamination produces visible streaks across large flat surfaces. Drying before blending is at 80 °C for 2–4 h, with a residual moisture ceiling of 0.05%. The production process uses injection moulding with sequential valve-gate opening across large flat surfaces to control weld lines, melt temperature 230–250 °C, mould temperature 50–70 °C, and holding pressure decay profiled to minimize sink over ribs. Screw size is selected to achieve a cushion of 3–5 mm and a residence time not exceeding 5 min at melt temperature, preventing yellowing of the styrenic fraction. Terminal finished parts include vacuum-cleaner dust cup retainers, room air-purifier side panels, dehumidifier condensate tray covers, and washing-machine control panel surrounds.

Diagnostic laboratory equipment housings that are not intended for patient contact use TERLURAN 978T where high-flow injection moulding reduces cycle time in multi-cavity tools for benchtop analyzer faces. The compliance assessment is narrowly defined: if the housing is not operator-contact for prolonged periods and not patient-contact, biocompatibility evaluation under ISO 10993-1 is not automatically required; electrical safety for medical electrical equipment is reviewed under IEC 60601-1, while material documentation is aligned with RoHS 2011/65/EU and REACH SVHC declarations. The formulation is kept as 98.0–99.0 parts virgin granulate; colour adjustment uses 1.0–2.0 parts medical-sector masterbatch with an ABS carrier. Reuse of regrind is generally excluded unless the moulding operation has validated that ≤10 wt% closed-loop regrind does not alter tensile elongation and impact retention under ISO 527-2 and ISO 179-1/1eA. Drying is performed at 80 °C for 3–4 h in a desiccant dryer with dew-point monitoring at −30 °C or lower. Moulding takes place in a controlled environment to limit particulate deposition; screw L/D is 20:1–25:1, melt temperature 225–245 °C, mould 45–65 °C, and clamp force calculated from projected area without relying on pack pressure to hold the mould closed. Terminal products include polymerase chain reaction instrument covers, hematology analyzer front bezels, laboratory centrifuge outer shells, and diagnostic monitor frames.

If gate vestige control is critical in power-tool and outdoor-equipment enclosures

In power-tool and outdoor-equipment enclosures, TERLURAN 978T is processed where the part design includes deep bosses, snap-fit features, and elevated surface area. Compliance for electrical power tools references IEC 62841-1 for motor-operated hand-held tools; material-level flammability classification under UL 94 is typically HB, and any V-0 requirement demands a flame-retardant ABS variant rather than this unfilled grade. Environmental substance restrictions under RoHS 2011/65/EU and REACH are applied to the complete assembly. The addition ratio in these semi-structural enclosures is 100 parts virgin resin with 1.0–2.5 parts pigment masterbatch and 0–10 parts reprocessed sprues/runners; the upper regrind limit is set at 10 wt% because higher recycled content has been observed to widen notched impact variance under ISO 179-1/1eA at −30 °C in ribbed sections. Moulding equipment includes a hydraulic or hybrid injection press with screw compression ratio 2.0:1–2.5:1 and shot capacity such that melt residence time remains below 5 min. Melt temperature is 230–245 °C, mould temperature 40–60 °C, injection pressure sequenced to constrain peak cavity pressure below 700 bar, and gate size at least 60% of the nominal wall thickness to prevent jetting. Terminal components include drill motor housings, leaf-blower engine covers, portable saw guards, and battery-tool handle shells.

When toy-safety traceability requires batch-level pigment documentation, TERLURAN 978T is moulded for rigid ride-on toy body panels and sports-timing device housings. Compliance is dominated by the EU Toy Safety Directive 2009/48/EC, which invokes EN 71-3 for migration of 19 elements; the relevant limits for lead, cadmium, chromium(VI), and other elements apply to the final coloured compound, not only the base polymer. U.S. market requirements reference ASTM F963-23 heavy-element limits and consumer product safety rules under the CPSIA. The addition ratio is 100 parts ABS granulate with 1.0–3.0 parts high-purity pigment masterbatch; only pigment masterbatch with documented EN 71-3 migration test results is permitted. No post-industrial regrind is used in toy formulations because batch-level traceability and colour-batch separation are part of OEM inspection plans. Moulding is performed on a single-screw injection machine with 20:1 L/D, melt temperature 215–235 °C, and mould temperature 35–55 °C. Lower melt temperature within this range is preferred to reduce odour and volatile generation, but it demands higher injection speed to fill ribbed sections without short shots. Terminal components include ride-on toy wheel arches, dashboard facias, handheld game housings, and protective shells for sports scorekeeping devices.