Guangzhou Keyuan New Material ABS 810 is charged into a desiccant-bed hopper dryer with a dew point of -30 °C or lower and dried at 80±5 °C for 2–4 h. Residual moisture is determined by ISO 15512:2019 and held at ≤0.05%; lots exposed to ambient air for more than 4 h at RH 60% are redried. In desktop power adapter enclosure production, a nominal wall thickness of 0.9–1.2 mm is filled on a 1200 kN hydraulic injection moulding machine with a 35 mm general-purpose screw and an open nozzle. Barrel settings from rear to nozzle are 220–230–235–240–235 °C, with nozzle melt temperature measured at 230–245 °C. First-stage injection pressure is recorded at 850–1150 bar; holding pressure is set at 50–70% of the actual fill pressure, and holding time is established by gate-seal time rather than part weight only. Screw speed is limited to 60–90 rpm, back pressure to 5–10 bar hydraulic, and shot size to 40–70% of barrel capacity so that residence time at 240 °C remains below 6 min. Mould surface temperature is controlled at 45–60 °C; mould temperatures below 40 °C deepen weld lines at boss intersections and reduce small-radius gloss, while mould temperatures above 70 °C extend required cooling time without measurable property gain. Cold-runner regrind is added at no more than 20 wt%; higher regrind fractions reduce instrumented puncture energy under ISO 6603-2 and increase lot-to-lot colour drift. A 1 wt% carbon black masterbatch is used for black enclosures, and colour-matched lots are verified for melt-flow stability under ISO 1133-1:2022 at 220 °C/10 kg. Lot-to-lot melt-flow variation is monitored because a shift of ±2 g/10 min is enough to change thin-wall injection pressure by 60–100 bar. Enclosure safety is evaluated under IEC 62368-1:2023; flammability classification of ABS 810 in this end use is UL 94 HB at 1.5 mm unless a lot-specific UL Yellow Card lists another rating. ABS 810 is not substituted for flame-retardant ABS or PC/ABS where a V-0 rating at 0.8 mm is required by the product standard. RoHS screening under 2011/65/EU Annex II and REACH SVHC communication under 1907/2006 are managed through supplier declarations; these are not substitutes for end-product conformity.

What Prevents a 0.8 mm Automotive Pillar Garnish from Reaching Both Class-A Gloss and Full Rib Fill?

In high-gloss black pillar garnishes, ABS 810 is processed on a 1600 kN accumulator-assisted or high-speed electric machine. The cavity wall is 0.8 mm at the visible face; attachment ribs are 0.45–0.55 mm thick and must fill without flash. The critical interaction is between melt temperature, surface replication and resin residence time. Melt temperature below 230 °C increases shear viscosity and produces short shots or deep weld lines at rib roots; melt temperature above 245 °C can volatilize low-molecular-weight additives and generate splay at the gate, reducing 20° gloss under ISO 2813. A control band of ±5 °C around the optimal nozzle temperature is therefore maintained. Capillary rheometry under ISO 11443:2021 at 230 °C and 1000 s⁻¹ typically places shear viscosity in the 90–160 Pa·s band for high-flow injection ABS; lot-specific curves from the ABS 810 certificate of analysis determine the final setpoint. Injection time is set at 0.45–0.75 s; longer fill times create hesitation marks where the melt front crosses rib intersections. Holding pressure is 65–80 MPa, with switch-over position controlled to 2–4 mm cushion. Tool temperature is kept at 50–70 °C to reproduce the polished cavity finish; above 75 °C parts tend to stick to the cavity and colour shift becomes measurable. Formulation for this application is 100 mass parts ABS 810 with 0.3–0.5 phr external lubricant, 0.2 phr antioxidant and 1.0–1.5 phr UV stabiliser. Regrind is restricted to 10 wt% or less because higher regrind fractions lower 60° gloss below 90 GU and widen the shot-to-shot peak injection pressure. Gate location is placed at a hidden edge to avoid visible gate blush; sequential valve gates are avoided because they introduce flow-front temperature loss of 5–10 °C and create halo marks. Rib root radius is specified at 0.4–0.6 mm; sharp corners below 0.2 mm radius produce stress concentration and reduce weld-line strength by 30–40% in short-beam tests under ISO 178. Flammability of the finished trim is tested under ISO 3795:1989 or FMVSS 302; ABS 810 does not provide inherent flame retardance and is used only where the prescribed burn rate is met by part design and wall section. The grade should not be mixed with PVC or acetal regrind; HCl from PVC decomposition catalyzes ABS chain scission, while formaldehyde from acetal degradation produces voids and delamination. Automotive fogging and odour requirements such as DIN 75201 or VDA 278 must be verified separately because published data for ABS 810 in this specific configuration is limited.

Processing window matrix for ABS 810 across three principal conversion routes.

In cyclone housings for canister and upright vacuum cleaners, ABS 810 is processed as a 2.0 mm main wall with 1.2 mm scroll ribs and multiple snap-fit tabs. The tooling is a multi-plate mould on a 1600 kN hydraulic press with a valve-gated hot runner. Drying before use follows 80±5 °C for 3–4 h; residual moisture above 0.08% is associated with silver streaking at the hot gate and reduced weld strength. Melt temperature at the nozzle is kept at 230–245 °C, and mould temperature is set at 50–65 °C. The annular scroll geometry creates converging flow fronts; weld lines inside the scroll are unavoidable, so the gate is positioned to shift the weld line to a low-stress region and the cavity is vented around the convergence line. Weld factor for static strength under ISO 527-2:2012 at 23 °C is typically 0.7–0.8 of the bulk tensile yield value; if higher retention is required, a lower-viscosity or higher-toughness grade should be evaluated. Impact resistance at the snap-fit tab is checked with notched Izod under ISO 180/A at 23 °C and at -10 °C; failure of sharp-corner tabs below 0.2 mm root radius is often due to tool wear rather than resin lot variation. Regrind is added at 15 wt% maximum, and black colour is obtained with a 2 wt% carbon black masterbatch. Electrical safety is assessed under IEC 60335-1:2020; ABS 810 is used for structural enclosures that do not exceed 75 °C surface temperature during normal operation. Glow-wire testing under IEC 60695-2-11 is performed at the end-product level; if an unattended appliance requires 850 °C glow-wire ignition temperature, plain ABS 810 may not pass and a flame-retardant or mineral-filled grade should be selected. Avoid dry blending with amine-based flame retardant additives; amine species can interfere with moisture uptake and accelerate yellowing at 240 °C. To avoid sink marks over 2.5 mm bosses, gas counterpressure or foaming is not recommended; instead the boss is cored and gusseted at 0.8–1.0 mm wall to maintain packing.

When Chrome Plating Lines Specify ABS 810 for Sanitary Fittings

Chrome-plated bathroom and sanitary fittings are produced from ABS 810 by injection moulding a low-stress preform, followed by etch-and-plate processing. The first requirement is that the moulded surface be free of high shear stress; internal mould release levels above 0.2 phr or silicone-containing mould release residues migrate to the surface and cause skip plating. The plating line operates with a chromic acid etch bath containing 380–420 g/L chromium trioxide and 180–220 g/L sulphuric acid at 60–70 °C. Etch time is set at 8–15 min, depending on butadiene particle etch rate; a uniform microporous surface with Ra in the 0.2–0.5 µm range is required before neutralization. After etch, parts are treated in a neutralizer, then electroless or electrolytic copper strike is applied, followed by bright nickel and decorative chromium layers. Current density for copper strike is controlled at 2–5 A/dm²; higher current densities produce roughness at high current density edges. Adhesion of the plate is evaluated by thermal cycling under ASTM B604, with no blistering, cracking or peel-back after cycles between -40 °C and 80 °C. Coupon peel strength is commonly required above 100–200 N/m; if ABS 810 has not been specifically designated as a plating grade, a lot-specific etch-rate and peel-strength validation must be performed because published data for this grade in electroplating systems is limited. The compound must not be contaminated with PVC or acetal; polyolefin contamination produces unetched islands and local loss of plate adhesion. Regrind above 10 wt% is not recommended for plated parts because regrind history widens surface etch rate and creates visible pits after plating. Preform moulding uses melt temperature 220–235 °C rather than the higher settings used for thin-wall parts, because lower melt temperature reduces residual stress; mould temperature is set at 60–75 °C to minimise frozen-in orientation. After electroplating, dimensions grow by the thickness of the deposited metal stack; tolerances must allow for 20–40 µm total plate thickness on functional bosses and threads.

Monitor bezels and audio-video panel frames are moulded from ABS 810 in multi-cavity tools with cold runner gates of 0.8–1.0 mm and a projected area that typically requires a 2000 kN or larger press. The dimensional specification is tied to ISO 291 standard atmosphere 23±2 °C, 50±5% RH and ISO 294-4 for moulding shrinkage. For ABS 810, moulding shrinkage is 0.4–0.6% in the flow direction and 0.5–0.7% transverse, with post-mould shrinkage less than 0.1% after annealing at 80 °C for 2 h. These values are not constants; they shift with wall thickness, gate geometry and packing time. Cavity-to-cavity mass variation is held below 0.2% by balancing hot runner or cold runner scrap, and cushion position is kept at 2–4 mm to maintain consistent packing. Weld lines formed at screen cutouts and cable exit slots are moved to non-appearance zones by gate relocation or flow leaders. A 2 wt% colour masterbatch produces colour consistency; shade is measured at D65/10° using ISO 11664-4. Surface quality is checked under ISO 2813 at a 60° geometry; visible splay, halo and gate blush are rejected. Flammability classification remains UL 94 HB at 1.5 mm unless the final product standard permits horizontal burning; if the display enclosure is specified under IEC 62368-1:2023, the end product must meet the enclosure flammability and ball-pressure requirements, and ABS 810 is used only for parts that do not require V-0 at wall sections below 1.5 mm. To avoid warpage after painting or metallizing, parts are stress-relieved at 70–80 °C for 30–60 min; skipping this step increases paint crazing and dimensional drift in assemblies. Compatibility with cleaning agents is tested under ISO 175:2010 before production; ABS 810 is not recommended for direct contact with ketone-based solvents.

Regulatory and test method matrix for ABS 810 target end uses.

Luggage shell sag control is not improved by raising melt temperature alone.

ABS 810 sheet for thermoformed luggage shells is produced on a co-rotating twin-screw extruder with an L/D ratio of 33:1 and vacuum venting. The resin is dried at 80±5 °C for 4 h minimum to a moisture content below 0.05%; wet resin causes steam bubbles in the sheet that become pinholes after thermoforming. Screw speed is set at 35–60 rpm, melt temperature at the die is 220–240 °C, and die pressure is recorded to detect gel or filler accumulation. The three-roll polishing stack is held at 85–110 °C; lower roll temperatures increase gloss but produce higher sheet orientation and warp, while higher roll temperatures cause sheet sticking and cooling line slowdown. Raising die temperature above 250 °C does not improve sheet sag; in 400 mm unsupported sheet spans on a single-station thermoformer, sag depth increases by 6–10 mm and draw uniformity deteriorates. Sag is controlled instead by lowering melt temperature to 215–230 °C, increasing roll stack speed, and using sheet-edge heating to reduce local cooling. During thermoforming, the sheet surface is heated to 150–180 °C; plug assist temperature is 110–130 °C and mould temperature is 40–55 °C. Typical draw ratio is 1:1.5 to 1:2.0; deeper draws cause thin-out below 0.3 mm at corners unless pre-stretch is optimised. The ABS 810 core is capped with a 10–15% ASA layer of total sheet thickness where UV stability is needed; testing is performed under ISO 4892-3 to the end-product ΔE limit. Regrind from skeleton trim is reintroduced at no more than 25 wt% in the core layer. Higher regrind content raises the thermoforming temperature and increases brittleness after low-temperature drop tests. If a customer-specific drop test at -20 °C is specified, a separate low-temperature impact grade should be screened because published data for ABS 810 at this condition is limited.

In non-patient-contact diagnostic device enclosures, ABS 810 is used for external shells that are not intended for skin contact beyond occasional handling and are cleaned with 70% isopropanol or quaternary ammonium disinfectants. The grade is not certified for body-contact or fluid-path applications under ISO 10993-1:2018, and no biocompatibility claim is made. Moulding is performed on a 1200–1600 kN electric press with a 30 mm or 35 mm screw, melt temperature 225–240 °C, and mould temperature 50–65 °C. The shell design uses a 1.5–2.0 mm wall to meet impact and structural requirements, with snap-fit retention features and ultrasonic weld joints. Ultrasonic welding is performed at 20 kHz with a 0.25–0.5 mm shear-joint interference and amplitude of 30–40 µm; excessive amplitude creates weld flash and weakens the joint because ABS 810 dissipates energy rapidly at the weld interface. Regrind is allowed up to 15 wt% internally, but regrind from painted or metallized parts is excluded. Chemical resistance is a key processing boundary; ABS 810 is incompatible with ketones, esters and aromatic hydrocarbons. Compatibility with the intended hospital disinfectant is tested under ISO 175:2010 before production; stress cracking can occur at moulded-in stress if the part is exposed to solvent without post-mould annealing. Annealing at 70 °C for 1 h reduces solvent stress-cracking in critical snap-fit regions. Electrical safety of the finished device is assessed under IEC 60601-1:2005/AMD1:2012/AMD2:2020; ABS 810 contributes mechanical enclosure protection but does not provide electrical insulation or flame retardance beyond its natural polymer limits. Where the product standard requires flame-rated enclosures, ABS 810 is not a substitute for flame-retardant ABS or PC/ABS.