Unpainted black PC/ABS 10302BK from Dongguan Zhongen is specified for hidden instrument panel carrier brackets, defroster grille bases, and lower steering column shrouds where the carbon black pigment eliminates post-mould topcoat application. In production on cold-runner tools with sequencing valve gates, the compound is heated to a melt temperature of 250 °C to 280 °C, while the tool surface is held at 70 °C to 90 °C. For spans above 400 mm, differential contraction between the polycarbonate-rich surface and the ABS-modified core can produce flatness deviation greater than 0.8 mm if gate-seal is not completed. Packing pressure is therefore sustained at 60 MPa to 80 MPa for 6 s to 10 s; a two-step hold-pressure decay reduces sink around bossed features. Shrinkage is characterized under ISO 294-4; plaques from this class typically show flow-direction shrinkage of 0.5% to 0.7% and transverse shrinkage of 0.6% to 0.8%, but Dongguan Zhongen has not published grade-specific values and mould trials are required. The exact polycarbonate-to-ABS ratio of 10302BK is not disclosed in the grade designation; when heat deflection under ISO 75-1/-2 at 1.8 MPa must exceed 110 °C, the PC content must be confirmed with the supplier because excessive ABS loading reduces the loadbearing ceiling. Volatile emission behaviour is process-dependent; black-pigmented PC/ABS processed with residual moisture not exceeding 0.02% can remain below 100 µg/g VOC and 50 µg/g FOG on VDA 278, but this is not an inherent grade certificate. Weld lines downstream from holes can retain only 50% of nominal ISO 180/1A notched Charpy impact; gate positions should move weld lines away from load-bearing snap fits and mounting bosses.

What Changes When 10302BK Is Moulded Into Handheld Power Tool Housings?

Handheld power tool housings are typically moulded at wall thicknesses of 2.5 mm to 3.5 mm and must survive repeated drops from 1 m onto concrete at -20 °C. Impact performance is measured by ISO 180/1A notched Charpy and ISO 179/1eU unnotched Charpy; the carbon black in 10302BK can reduce low-temperature ductility by a measurable margin compared with natural PC/ABS, so rib roots should not drop below 2.0 mm and snap hooks need a minimum draft angle of 1.5° to avoid ejection stress. Moulding is often conducted on a 350 t to 500 t hydraulic machine with a metered shot volume of 50% to 70% of barrel capacity. Melt temperature is set at 255 °C to 275 °C, and the tool is run with water heating at 60 °C to 80 °C to minimize as-moulded stress. A full hot runner with sequential valve pins is preferred; direct sprue entry into the side wall creates jetting streaks that appear as dark bands on the black surface. Regrind addition up to 20% is used only after drying and fines removal because higher regrind levels in black-pigmented PC/ABS commonly lower ISO 180/1A by 15% to 25% through thermal history concentration at the pellet surface. For double-insulated power tools under IEC 62841-1, the housing is not automatically a flame-rated part; 10302BK carries no FR suffix, so if a UL 94 V-0 or V-1 housing is required, a designated flame-retardant compound must be selected or the specific black batch must be tested under IEC 60695-11-10. The exact PC-to-ABS ratio should be obtained from the supplier because ABS-rich variants in this viscosity class can show softening under service oils; compatibility screening with SAE 20 mineral oil and lithium grease is performed by ISO 22088-3 constant-strain exposure for 48 h.

Thin-wall notebook bottom covers and docking station housings use 10302BK when the moulder needs a black substrate that can be filled below 1.8 mm section thickness without excessive pressure drop. The melt volume-flow rate should be checked under ISO 1133-1:2022 at 260 °C/5 kg; this class of PC/ABS commonly falls between 15 cm³/10 min and 30 cm³/10 min, but the batch-specific value for 10302BK must be taken from the certificate of analysis rather than assumed. Injection velocity is elevated to 150 mm/s to 250 mm/s on thin-wall tools with plate thicknesses below 1.5 mm; filling analysis should target a pressure drop below 1200 bar at the nozzle. The black moulded-in colour removes the need for a cosmetic paint line, but it is not a UV stabilizer. If the top cover is exposed to direct sunlight, accelerated ageing under ISO 4892-2 method A is required, because carbon black alone does not prevent photolytic reduction in molar mass. Tactile and snap-fit areas require rounded internal corners with radius at least 60% of wall thickness to reduce stress concentration. The grade can be metallized by electroless nickel-copper or vacuum sputtering for EMI shielding; the black surface provides visual contrast for coating continuity, but the substrate itself is not sufficiently conductive to provide ESD or shielding function. The PC-to-ABS ratio is not printed in the grade code; for thin-wall flow, ABS contributes melt mobility while PC contributes heat resistance, so users should compare the supplier’s flow-rate ratio and heat deflection temperature before substituting a natural PC/ABS.

Low-Voltage Switchgear Covers, Terminal Covers, and Wiring Enclosure Compliance

Black PC/ABS 10302BK can be evaluated for terminal shrouds and non-current-carrying covers in low-voltage switchgear assemblies operating below 1000 V AC or 1500 V DC. The decisive limitation is flame classification: the grade designation carries no FR suffix, so a UL 94 V-0 rating must not be assumed. If the enclosure is used near arcing contacts, it should be tested under IEC 60695-11-10 and glow-wire tested per IEC 60695-2-11, with the final part thickness from 1.5 mm to 3.0 mm. Comparative tracking index under IEC 60112 is required for functional insulation; typical PC/ABS can fall between PLC 2 and PLC 4 at 400 V to 600 V, but the carbon black loading and ABS ratio in 10302BK are not published, so CTI cannot be derived from the grade name. Dimensional stability is evaluated after heat ageing at 80 °C for 500 h; tensile retention is measured by ISO 527-2, and a fall-off greater than 15% indicates hydrolytic degradation. Processing uses wall thicknesses from 2.0 mm to 3.2 mm, melt temperature 250 °C to 275 °C, and mould temperature 70 °C to 90 °C. To reduce internal stress near metal inserts, the inserts are preheated to 90 °C to 110 °C before overmoulding; cold inserts cause microcrazing around the interface after thermal cycling. The PC phase concentration must be confirmed with Dongguan Zhongen because high PC content raises deflection temperature but also increases moulded-in stress if cooling is too rapid. Published data for this specific black formulation in switchgear enclosures is limited, so each loadcase requires first-article testing under IEC 60664-1 clearance and creepage assumptions.

Diagnostic analyser shells and bedside monitor enclosures are moulded from black 10302BK when the device is classified as a non-applied part. The material is not biocompatible by designation; if the housing can be touched by the patient for extended periods, ISO 10993-5 cytotoxicity and ISO 10993-10 irritation testing are required on the moulded part. For normal cleaning, surfaces are exposed to 70% isopropanol and quaternary ammonium agents; black-pigmented PC/ABS can stress-crack under constant strain if disinfectant remains pooled at bosses and snap features. Compatibility screening follows ISO 22088-3 with 24 h to 48 h immersion or wet-patch contact at 23 °C to 40 °C. The tool is run with a mould temperature of 80 °C to 95 °C to minimize residual stress; lower temperatures create a frozen skin that later amplifies chemical attack at gate vestiges. Melt temperature is kept at 255 °C to 275 °C, and hot runner drops are balanced to ± 1.5 °C because asymmetric fill can produce visible flow lines on black glossy covers. The exact PC-to-ABS ratio is not stated in the 10302BK grade code; users selecting the compound for alcohol-heavy cleaning should request the ratio, because ABS-rich formulations show earlier cracking under ISO 22088-3 constant-strain ethanol exposure. The black colour may help mask minor marring from cleaning, but it does not increase chemical resistance beyond the underlying alloy chemistry.

When the Paper Path Frame Requires Low Warpage After Heated Enclosure Duty

In printer and multifunction device chassis plates, 10302BK is selected when internal ambient temperatures reach 60 °C to 70 °C during sustained duplex printing. Heat deflection temperature is measured by ISO 75-1/-2 method A at 1.8 MPa; the black grade should remain above 100 °C for this duty, but the result depends on the exact PC-to-ABS ratio and carbon black level. Flatness is checked after 24 h at 70 °C using ISO 294-4 shrinkage plaques or a datum-point fixture; warpage above 0.5 mm on a 300 mm side indicates gate-freeze imbalance. Moulding uses a single end-gated lance to orient flow along the long axis. Melt temperature is set at 260 °C to 275 °C, mould surface at 80 °C to 90 °C, and hot runner manifold balance is maintained within ± 2 °C because the viscosity of PC/ABS shifts strongly with temperature. Residual moisture above 0.04% creates splay at thin rib intersections and reduces snap-fit impact; drying to 0.02% or below by ISO 15512 is mandatory. The compound does not carry a flame-retardant suffix; if the paper path passes near a fuser or DC controller, the OEM may require UL 94 V-2 or better, which must be tested or confirmed with the supplier. The blend ratio should be obtained from Dongguan Zhongen before qualifying, because higher ABS content improves flow for long ribs but reduces the upper operating temperature. Machined or insert-moulded metal bushings in paper path frames are preheated to 90 °C to 100 °C to prevent radial cracks at the insert after thermal cycling between 20 °C and 70 °C.

White goods control consoles and top-loading washer fascia frames are injection moulded from 10302BK where the OEM design specifies a black surface without painting. Melt temperature is held at 250 °C to 270 °C, with mould coolant at 60 °C to 80 °C. For textured surfaces with SPI D-2 finish, black gloss at 60° is typically below 10 GU under ISO 2813, but gloss is tool-finish-dependent and not a fixed grade property. Detergent splash exposure is screened by 24 h contact with 5% sodium carbonate solution and 1% nonionic surfactant at 40 °C; tensile strength retention above 90% is the pass criterion under ISO 527-2. The ratio of polycarbonate to ABS in 10302BK is not printed in the grade designation; prolonged contact with acetone-based cleaners and butyl cellosolve should be avoided because ABS phase plasticization can reduce weld-line strength. The black carbon black addition can hide light staining from detergent film, but it does not provide resistance to strong alkali at temperatures above 60 °C. If the fascia is retained by heat staking, stake temperature should not exceed 250 °C for more than 2 s per boss to prevent black surface blisters at the backside.