Dongguan Xinsu Source PC/ABS 5060BK01 is supplied as a black-pigmented polycarbonate/acrylonitrile-butadiene-styrene blend intended for injection-moulded structural enclosures, brackets, appliance housings, and non-transparent interior components. The model string 5060BK01 does not, in publicly available documentation, define the polycarbonate-to-ABS ratio, melt volume-flow rate, flame-retardant content, impact modifier package, or filler content; BK01 is consistent with a black colouration suffix but must be verified against the supplier’s lot-specific certificate of analysis. Published data for this specific configuration is limited. Class-level unfilled PC/ABS alloys typically have a density of 1.08 to 1.16 g/cm³ when measured according to ISO 1183-1:2019. The grade is not appropriate for transparency-dependent applications because the black pigmentation prevents light transmission. Thin-wall sections below 1.5 mm require elevated mould temperatures and high injection velocities to avoid short-shot and weld-line defects; these constraints are inferred from general PC/ABS processing literature rather than from a supplier-specific datasheet.

In production-scale injection moulding, the practical performance of a black PC/ABS such as 5060BK01 is strongly affected by pigment dispersion and melt-temperature history. Carbon black masterbatch at loadings above 0.2 wt% may raise low-shear viscosity and nucleate the polycarbonate phase, producing moderate increases in tensile modulus but also reductions in notched impact strength and weld-line elongation. On multi-gate tools, weld-line regions in black PC/ABS compounds commonly show tensile strength reductions of 20% to 40% relative to non-weld areas when injection speed, melt temperature, and mould temperature are not optimised. This failure mode is observed on injection moulding machines with clamp forces between 80 and 120 tonnes when mould temperatures drop below 50°C. The mechanical response of 5060BK01 at weld lines has not been released in public datasets; therefore, first-article weld-line testing should be conducted before series production.

Applications for this class of black PC/ABS include interior brackets for automotive instrument panels, appliance control panels, power-tool housings, and enclosures for low-voltage electrical equipment. Use conditions should be matched to the material’s heat deflection and impact ranges. For electrical enclosures, creepage and clearance distances are governed by part design rather than resin properties; the material must, however, resist deformation during hot-condition tests such as IEC 60068-2-2. Black colouration is often favoured for aesthetic consistency and hiding minor surface contamination, but it also masks scorch marks and degraded resin streaks, which complicates visual inspection on the production line.

Which Test Methods Apply to the Unfilled PC/ABS Alloy Class?

Incoming inspection for a black-pigmented PC/ABS grade should include melt volume-flow rate, moisture content, tensile stress at yield, notched impact resistance, deflection temperature under load, and Vicat softening temperature. The relevant test designations for this material class are ISO 1133-1:2022 for melt flow, ISO 527-2:2012 and ASTM D638-14 for tensile properties, ISO 178:2019 and ASTM D790-17 for flexural modulus, ISO 179-1:2010 and ASTM D256-10 for notched impact, ISO 75-2:2013 and ASTM D648-18 for heat deflection temperature, and ISO 306:2022 for Vicat softening. Because the supplier does not publish a complete datasheet for 5060BK01, lot acceptance must be based on internally derived control limits rather than nominal values taken from another PC/ABS product.

The tabulated values are class-level control ranges for unfilled PC/ABS, not certified values for 5060BK01. Published data for this specific configuration is limited; if a certificate of analysis from Dongguan Xinsu Source does not include ISO 527-2 yield stress and ISO 179-1 notched impact values, incoming batches should be tested on a calibrated universal testing machine with a clip-on extensometer and a motorised impact tester. Drying to below 0.02% moisture is critical because polycarbonate hydrolyses at melt temperatures above 260°C. Moisture above 0.05% can generate silver streaks, reduce molecular weight, and lower notched impact resistance by more than 20% in this class of material.

Dynamic mechanical analysis of unfilled PC/ABS alloys of this class typically resolves two glass transitions. The ABS-rich phase commonly exhibits a loss peak near 100–120°C, while the polycarbonate-rich phase commonly exhibits a loss peak near 140–155°C. The exact peak temperatures depend on blend ratio, ABS composition, and pigmentation. No dynamic mechanical data for 5060BK01 have been published, so the location of these transitions should be confirmed by differential scanning calorimetry or dynamic mechanical analysis on representative moulded specimens before high-temperature dimensional stability is specified.

At shear rates typical of thin-wall filling, approximately 500 to 5000 s⁻¹, PC/ABS alloys of this class usually exhibit shear thinning. Capillary rheometry at 260°C can be used to compare incoming lots. A melt volume-flow rate shift of more than 10% from the first-approved lot should trigger a process window review, because viscosity changes alter filling pressure, weld-line position, and shrinkage anisotropy. In-mould rheometry on a production machine provides a more representative signature than laboratory MVR when the mould has long flow paths or wall thicknesses below 2.0 mm.

When Moisture Content Exceeds 0.02% Before Melt Processing

Moisture is a threshold processing variable for PC/ABS. Polycarbonate undergoes hydrolytic chain scission at elevated melt temperatures, and the ABS phase can contribute to splay and surface haze when venting is insufficient. A desiccant-bed hopper dryer with a dew point below -30°C should be used. Drying at 80 to 100°C for 2 to 4 h generally reduces pellet moisture below 0.02%; ambient relative humidity above 60% shortens the allowable open-container hold time and favours closed conveying from dryer to feed throat. Material removed from the dryer should be consumed within 30 min under high-humidity plant conditions unless a dry-air hopper receiver maintains pellet temperature and dew point. Overdrying above 110°C for more than 6 h can cause pellet sintering, yellowing, and additive loss. The optimum drying profile for 5060BK01 should be confirmed by Karl Fischer titration rather than inferred from time alone because lot-specific moisture content has not been publicly characterised.

At the injection moulding machine, the barrel temperature profile from feed to nozzle should be maintained in the range of 240–280°C, with the nozzle set between 250 and 270°C. Mould temperatures of 60 to 90°C are used for unfilled PC/ABS to support surface replication and reduce weld-line weakness. If mould temperature falls below 50°C, the polycarbonate-rich skin can freeze before the ABS-rich core has fully packed, producing visible flow marks and embrittled weld lines. Holding pressure should be determined by a gate-seal study; insufficient holding pressure creates sink marks in thick sections, while excessive pressure may flash the tool and overload the clamp. For a part with a projected area of 300 cm² and a cavity pressure of 30 MPa, the required clamp force is approximately 900 kN. Selection of a machine with lower clamp force is a known production constraint when moulding larger PC/ABS housings.

Compounding of PC/ABS of this class is normally carried out in a co-rotating twin-screw extruder with an L/D ratio from 36:1 to 44:1. The addition point for black masterbatch affects dispersion and impact retention. Feeding carbon black at the main throat can raise melt temperature and reduce throughput; side-feed addition after the polycarbonate melting section preserves ABS rubber particle size and reduces the loss of impact strength. These compounding details for 5060BK01 are not disclosed in public supplier documentation.

Compared with a natural, unfilled PC/ABS blend of similar melt viscosity, the black-pigmented 5060BK01 is expected to differ in colour-related rheology, weld-line tensile strength, and surface defect sensitivity. Carbon black particles increase low-shear viscosity and can obscure early discolouration that would otherwise indicate thermal degradation. Weld lines in black PC/ABS parts often show lower elongation at break than natural grades because pigment particles concentrate at the melt front and restrict polymer chain interdiffusion. Surface quality is also more demanding for black grades: gloss variation, gate blush, and flow hesitation are more visible, so mould temperature uniformity and injection velocity profiling must be stable. These comparisons are based on general PC/ABS processing behaviour and should not be interpreted as lot-specific data for 5060BK01.

Relative to unmodified polycarbonate, this alloy class reduces melt processing temperature and improves resistance to environmental stress cracking in contact with oils and low-molecular-weight plasticizers, but sacrifices clarity, some UV stability, and some tensile strength. Relative to neat ABS, the PC/ABS class increases heat deflection temperature and low-temperature impact resistance while requiring more disciplined drying and higher melt temperatures. These comparisons are based on the general PC/ABS class; the absence of a public datasheet for 5060BK01 means that substitution into existing parts should be validated by full mechanical, rheological, and thermal testing on moulded specimens.

Within black PC/ABS product families, differentiation depends on the base polycarbonate melt flow rate, ABS rubber particle size, stabiliser package, flame-retardant chemistry, and pigment type. Some grades use brominated flame retardants with antimony trioxide; others use phosphorus-based or silicone-based systems. Without a public UL yellow card for 5060BK01, no flame-retardant classification can be assumed. If the component requires glow-wire compliance under IEC 60695-2-12, the test must be performed on the final wall thickness. Black colouration can alter ignition behaviour by absorbing radiant heat, so natural-grade flammability data should not be transferred to this product without verification. If the 5060BK01 designation is assumed to indicate an unfilled grade, it would be expected to have lower flexural modulus and higher impact strength than mineral-filled PC/ABS, and lower tensile modulus than glass-fibre-reinforced PC/ABS; however, an ash-content determination under ISO 3451-1:2019 is required to confirm the absence of talc, glass fibre, or other mineral filler.

Flammability, Regulatory Compliance, and Incompatibility Boundaries

Regulatory compliance for a black-pigmented PC/ABS blend must be established at the compounded-formulation level. The RoHS Directive 2011/65/EU Annex II restricts lead to 0.1% by weight in homogeneous material and cadmium to 0.01%. Carbon black feedstocks may be associated with polycyclic aromatic hydrocarbons controlled under REACH Regulation 1907/2006 Annex XVII, depending on the manufacturing route and supplier quality system. A supplier declaration for 5060BK01 should state the SVHC candidate list status and identify whether the carbon black is furnace-based or pyrolysis-derived. In food-contact applications, a PC/ABS alloy is not automatically covered by FDA 21 CFR 177.1580 because that section addresses specific polycarbonate resins; compounded alloys require migration testing under the relevant food-contact regulation before use.

Flammability class is thickness-dependent under UL 94. A material may achieve V-0 at 3.0 mm but HB at 1.5 mm, and black colorants can affect the flame front, dripping behaviour, and ignition time. UL tests should be performed on specimens moulded with the same shrinkage, surface finish, and regrind content as production parts. For appliance applications, glow-wire flammability index and glow-wire ignition temperature may be evaluated according to IEC 60695-2-11 and IEC 60695-2-12. The applicable test thickness should match the final component wall thickness because results from thicker or natural-colour specimens cannot be transferred automatically to the black 5060BK01 grade.

Melt processing of PC/ABS should avoid contact with PVC and polyacetal. PVC can release hydrogen chloride at processing temperatures, causing acid-catalysed degradation of the polycarbonate phase. Polyacetal can decompose to formaldehyde and formic acid, which produce surface defects and chain scission. Amine-based heat stabilisers and strongly alkaline additives should not be incorporated without thermogravimetric and melt stability verification because polycarbonate is sensitive to base-catalysed hydrolysis and transesterification at melt temperatures above 280°C. If regrind from black 5060BK01 is reused, the maximum allowable loading should be set by notched impact testing and melt volume-flow rate shift. For many unfilled PC/ABS grades, regrind levels up to 20% by weight are tolerated in non-critical parts; higher loadings raise the risk of lot-to-lot viscosity drift, colour streak formation, and weld-line weakening. No supplier-specific regrind data for 5060BK01 is available in public documents, so the 20% figure is a class-level boundary rather than a certified recommendation.

Outdoor use of black PC/ABS is often more stable than natural PC/ABS because carbon black acts as an ultraviolet absorber; nevertheless, surface chalking and gloss loss can develop after prolonged xenon-arc exposure. Accelerated weathering according to ISO 4892-2:2013 cycle A should be used to compare colour change and retention of notched impact strength. Published data for the 5060BK01 grade in outdoor environments is limited, so field-equivalent testing on final moulded parts is required before specifying the product for exterior applications.