Terluran 997 is an injection-molding ABS grade specified for thin-wall, high-gloss, medium-impact downstream components. Material characterization follows ISO 2580-2, melt volume-flow rate is determined by ISO 1133-1:2022, tensile properties by ISO 527-1, Charpy impact by ISO 179-1:2010, and Vicat softening by ISO 306. The application scenarios below are limited to sectors with documented injection-molding conversion for this grade. Extrapolation to sheet extrusion, blow molding, thermoforming, or solvent casting requires separate validation because the rheology and thermal stability are not interchangeable across these processes.

When high-gloss thin-wall enclosures for small kitchen appliances are specified, the material is selected for melt-flow length in multi-cavity tools and its ability to reproduce polished cavity surfaces. In electric kettle side panels, bean-to-cup coffee machine front frames, hand blender motor shells, and food processor body covers, the molded wall thickness typically falls between 2.0 mm and 2.5 mm, with local ribs and bosses at 0.9–1.2 mm. Under IEC 60335-1 and EN 60335-2-15, the external enclosure must withstand ball pressure testing at 75 °C under IEC 60695-10-2, and accessible surfaces must comply with glow-wire testing under IEC 60695-2-11 where the appliance connection is unattended. For repeated-use food-contact surfaces, the finished article is tested under Commission Regulation (EU) No 10/2011 by overall migration using EN 1186-1, with the limit of 10 mg/dm²; in the United States, acrylonitrile-butadiene-styrene copolymers are evaluated under 21 CFR 180.22. Because the unmodified grade is not inherently flame-retardant, any enclosure adjacent to uninsulated live parts requires additional assessment, and published data for this specific configuration is limited.

On the production floor, the formulation is a let-down of 100 phr Terluran 997 with 2.0–4.0 phr color masterbatch carried on an ABS or SAN carrier. External lubricant addition is held to ≤0.3 phr because free lubricant migrates to the cavity surface and produces flow-line haze under high-polish finish. Regrind from the same grade is limited to ≤20 phr; above this threshold, batch-to-batch Charpy notched impact values can drift downward by more than 10% and polybutadiene phase embrittlement becomes measurable under ISO 179-1:2010. The granules are dried in a desiccant dryer at 80 °C for 3–4 h to a residual moisture of ≤0.05% by ISO 15512, with a dew point of −30 °C or lower. A single-screw injection unit with a 20:1–22:1 L/D screw and a ring-check non-return valve is used; melt temperature is 230–250 °C, mold temperature 50–70 °C, holding pressure 40–60 MPa, and back pressure 0.5–1.5 MPa. The hot runner is valve-gated, with sequential valve opening delayed by 0.2–0.6 s to displace knit lines from the visible Class A surface.

The main process conflict is temperature asymmetry between the high-gloss exterior and thick bosses. If the mold is run below 50 °C, gloss replication drops and the visible surface develops micro-flow lines; if the mold is run above 70 °C, cycle time increases, and ejection marks appear on bosses exceeding a 1.5:1 base-to-height ratio. The acceptable processing window is therefore narrow, typically ±5 °C on the fixed half and ±4 °C on the moving half. Cavity surface roughness should be held below Ra 0.05 µm on the high-gloss side, while the rib side may use Ra 0.8 µm to improve venting. Terminal product types include electric kettle side housings, bean-to-cup coffee machine front bezels, hand blender motor covers, and food processor side shells; all are produced with a high-gloss external surface and a ribbed reverse face for snap-fit assembly.

Why do automotive interior programs require low-fogging high-flow ABS?

Automotive interior trim manufactured from Terluran 997 includes instrument cluster bezels, center console side panels, steering column shrouds, door switch bezels, and speaker grilles. These parts are not structural load-paths but are visible and tactile surfaces, so the material must balance high flow against low volatile condensables and scratch resistance. Automotive converters must maintain IATF 16949 process control and submit PPAP documentation. Flammability is evaluated under ISO 3795 and FMVSS 302; interior parts must meet a burn rate below 100 mm/min in the direction of propagation. Low-fogging and odor limits are tested per ISO 6452, VDA 275, and VDA 270, with OEM-specific maximums. For black piano-black trim, formulation uses 100 phr Terluran 997, 1.5–2.5 phr high-pigment black masterbatch, 0.2–0.5 phr hindered phenolic antioxidant, and 0.1–0.3 phr processing stabilizer. UV stabilization is added at 0.3 phr only when the trim is exposed to direct side-window sunlight; otherwise it is omitted to reduce material cost and potential plate-out.

Processing uses a melt temperature of 220–240 °C and a mold temperature of 30–50 °C for textured interiors. If a piano-black Class A surface is required, mold temperature is raised to 60–80 °C, but this lowers impact strength and increases cycle time by 15–25%. The material must be dried to ≤0.05% moisture. Valves are sequentially opened on the hot runner to prevent visible knit lines at the perimeter of the speaker grille holes. The most common failure mode on production lines is splay on the boss near the parting line if the screw speed exceeds 80 rpm and melt residence time exceeds 8 min; high-friction shear causes local heating in the barrel above 260 °C, degrading the polybutadiene phase. Scrap rates from batch-to-batch color variation are controlled by weighing masterbatch at 2.0 phr ±0.1 phr using gravimetric feeders, not volumetric dosing. Terminal products include cluster bezels, center console inserts, door handle recesses, steering column covers, and HVAC control panels. If electroplating is specified, an electroplating-grade ABS with controlled butadiene phase size should be evaluated; published data for Terluran 997 in chrome-plated automotive trim is limited.

Power adapter and router shells present a rheology-limited process window in multi-cavity, hot-runner molds with wall sections frequently reduced to 0.9–1.2 mm. In these parts, the governing compliance framework is IEC 62368-1 for audio/video and information technology equipment, supplemented by UL 94 HB flammability classification and the European RoHS Directive 2011/65/EU with its delegated directive (EU) 2015/863. REACH SVHC screening is applied to imported feedstock and finished articles. The formulation is kept as simple as possible: 100 phr Terluran 997 plus 2.0–3.0 phr carbon black masterbatch for black enclosures; for light gray or white shells, a titanium dioxide-containing masterbatch at 3.0–4.0 phr is used, but the carrier must be SAN or ABS to avoid surface delamination. Regrind at ≤15 phr is recommended because thin-wall filling length falls measurably above this level due to melt-flow reduction after multiple heat histories. An antistatic additive is generally not required for router shells because surface resistivity is not specified for this class.

On the injection-molding line, the melt temperature is set at 230–250 °C and mold temperature at 40–60 °C. Thin walls demand high injection speed, often 80–120 mm/s ram speed depending on screw diameter, with holding pressure 50–70 MPa and cooling time from 8 s to 14 s for a 1.0 mm wall with a 60 °C mold. Back pressure is limited to 0.5–1.0 MPa to avoid excess shear heating. The main process risk is short-shot at the last-fill area when the flow length/wall thickness ratio exceeds 120:1; this is corrected by adding a flow leader or moving the gate, not by raising melt temperature above 260 °C. Terminal products include router base shells, optical network terminal top covers, smart speaker frames, power adapter housings, and remote control battery covers.

Toy and juvenile product components under EN 71-3 migration limits

Injection-molded toy components made from Terluran 997 include interlocking construction blocks, board game tokens, toy vehicle body shells, and action figure accessories. The regulatory load is higher than for industrial goods. Under EN 71-3, accessible polymer substrates and dried coating layers are tested for migration of 19 elements, with limits that vary by element and material category. In the United States, ASTM F963-23 and 16 CFR 1303 govern heavy metals and small parts, while 16 CFR 1307 restricts specific phthalates in accessible plasticized components. Terluran 997 is unplasticized, but masterbatch carriers must be verified under REACH Annex XVII for phthalate content. The formulation is 100 phr Terluran 997 with 2.0–4.0 phr color masterbatch; only pigments listed as compliant with EN 71-3 are used. No external lubricant is added because silicone migrating to the surface could affect print adhesion on board game tokens. Regrind is limited to ≤10 phr when the part is a small component that can be placed in a small-parts cylinder under ISO 8124-1; higher regrind may increase brittleness after repeated drop cycles.

Processing is straightforward and deliberately conservative. The granules are dried at 80 °C for 3 h, melt temperature is held at 220–240 °C, and mold temperature is set at 40 °C. Injection speed is moderate to reduce weld lines at gate regions, and holding pressure is 35–50 MPa. The main field failure is drop-impact cracking at the weld line near the gate, which is corrected by increasing mold temperature to 50 °C or moving the gate to a non-appearance area. Terminal toys are not painted; color is integral to the polymer to avoid flaking and small-part ingestion. The final parts are washed or wiped with ethanol only if mold release-free processing cannot be maintained; otherwise no post-mold surface treatment is needed.

When valve-gated hot runners are used for wall sections below 1.2 mm

When the tool contains valve-gated hot runners and the nominal wall section falls below 1.2 mm, Terluran 997 is used for electrical installation faceplates, junction box covers, and control panel bezels. The compliance stack is dominated by IEC 60670-1 for boxes and enclosures for electrical accessories, IEC 60669-1 for switches, and IEC 60529 for ingress protection marking where the product is sealed with a gasket. Glow-wire testing under IEC 60695-2-11 is typically performed at 650 °C or 750 °C depending on the final product standard; unmodified Terluran 997 does not satisfy 750 °C glow-wire at 0.8 mm without an FR package, so the application must be limited to lower-temperature accessibility classes or an FR ABS grade must be substituted. The formulation is 100 phr Terluran 997 with 2.0–3.0 phr color masterbatch. For white faceplates, the titanium dioxide content in the finished part is 2.0–2.5 wt%, which is sufficient for hiding power without causing excessive nozzle wear if screw tip clearance is maintained.

Processing conditions are set to balance surface gloss and dimensional stability. The melt temperature is 230–250 °C, mold temperature 60–80 °C, holding pressure 50–65 MPa, and back pressure 0.8–1.2 MPa. Valve pins are opened when the melt front reaches the gate, not on a fixed timer, to avoid gate blush. The most common injection defect is weld line formation around the switch aperture; the weld line is moved into a non-visible edge by offsetting the gate or adding a flow-restrictor channel. Because the wall is thin, cooling time is held between 6 s and 12 s, and ejection is assisted by a two-stage ejector with air poppets to prevent white stress marks on the high-gloss surface. Terminal products include rocker switch faceplates, rotary dimmer knobs, socket outlet cover plates, and DIN rail enclosure front panels.