Dongguan Qiantai PC/ABS C02 is a pelletized polycarbonate/acrylonitrile-butadiene-styrene blend supplied for injection moulding and, in selected formulations, extrusion. The C02 designation identifies a specific melt-viscosity and phase-morphology position within the manufacturer’s C-series; it is not a published blend ratio, and exact lot values must be obtained from the supplier’s certificate of analysis. Publicly available datasheets for this exact configuration are limited, therefore the numerical ranges cited in this document are derived from ISO and ASTM methods applied to commercially available PC/ABS blends of equivalent architecture. The grade is typically specified for electronic equipment housings, automotive interior trim, domestic appliance enclosures, and structural clips where heat deflection, impact resistance, and thin-wall filling must be balanced without the cost and processing difficulties of neat polycarbonate or the lower heat resistance of neat ABS.

Material form is normally opaque pellets in natural or black, supplied in moisture-proof packaging; packaging configuration should be confirmed with the manufacturer. The pellets are moisture-sensitive because the polycarbonate segment undergoes hydrolytic chain scission at melt-processing temperatures when retained moisture exceeds 0.02 % as measured by ISO 15512 method. Unopened containers should be stored at 5–35 °C and kept away from direct UV exposure. Before processing, the material must be dried in a desiccant dryer rather than a hot-air oven because the dew point of the drying air must remain below -20 °C to reduce moisture to an acceptable level.

What Property Set Distinguishes C02 from Neat PC, ABS, and Flame-Retardant PC/ABS?

Polycarbonate contributes tensile elongation, heat deflection under load, and notched impact. The ABS phase lowers melt viscosity, improves processability, and reduces material cost. In commercial C-series PC/ABS blends of this type, room-temperature notched Izod impact typically remains above 35 kJ/m² when tested according to ISO 180/A, while heat deflection temperature under 1.8 MPa remains in the 95–115 °C range when tested according to ISO 75-2. A direct comparison with neat PC shows that C02 accepts lower melt pressure and provides longer flow length in thin-wall sections, but it sacrifices upper continuous service temperature and optical clarity. A direct comparison with neat ABS shows that C02 raises heat resistance and low-temperature impact but increases density and requires tighter drying control. When compared with flame-retardant PC/ABS grades containing halogenated or organophosphate flame retardants, C02 is generally not positioned as a UL 94 V-0 material at wall thickness 1.5 mm unless an independent UL Yellow Card for the exact grade states otherwise.

The tabulated values are comparative ranges for C-series PC/ABS architecture and are not supplier-certified C02 lot values. A batch release certificate must supersede the ranges when production decisions require exact minimums.

Rheological characterization on a capillary rheometer with a 1 mm diameter die and 20 mm length at 260 °C typically shows pronounced shear thinning between apparent shear rates of 100 s⁻¹ and 5000 s⁻¹. The viscosity at 1000 s⁻¹ is commonly two to three times lower than at 100 s⁻¹ for unfilled PC/ABS blends, which is why thin-wall filling improves when injection velocity is increased. However, published master curve constants for this exact C02 configuration are limited.

Hydrolytic degradation kinetics in PC/ABS are dominated by carbonate linkage scission in the polycarbonate phase. At melt temperatures above 260 °C, a residual moisture level above 0.03 % reduces molecular weight rapidly, causing splay, silver streaks, and a measurable drop in notched Izod impact of 10–20 % after a single residence cycle. Drying to below 0.02 % at 80–100 °C for 3–4 h in a desiccant dryer with a dew point below -20 °C is therefore a critical processing boundary. If ambient relative humidity exceeds 60 %, open-container exposure should be limited to 30 min to prevent reabsorption.

Residence time distribution in the barrel should be minimized during colour or material changeovers. Purging with a low-viscosity acrylic or polypropylene compound at 230–250 °C is common on production lines, but C02 should not be left stagnant at melt temperature for more than 12 min because polycarbonate discolouration begins as an off-yellow shift. Screw pull-out or hourly purges on idle machines have been used to prevent deposit formation on barrel walls and check rings in continuous operation.

For verification of thin-wall filling, a spiral-flow mould with channel thickness 1.0 mm and width 5 mm at melt temperature 260 °C and mould temperature 70 °C can be used. Commercial PC/ABS of this type typically achieves spiral lengths of 80–120 mm under 100 MPa injection pressure, but exact C02 spiral-flow data should be determined on the intended machine because flow length depends on gate geometry and injection rate.

If the Grade Is Applied to Thin-Wall Housings and Clips, Processing Parameters Shift

Thin-wall filling at nominal wall thickness 1.0–1.5 mm requires higher melt temperature and injection velocity than solid-section parts. On a 120 t hydraulic injection moulding machine running electronic enclosures with 1.2 mm nominal wall thickness, stable filling is typically achieved at melt temperatures of 250–270 °C, mould temperatures of 60–80 °C, and injection pressure of 80–120 MPa. The melt temperature is measured at the nozzle by an immersion thermocouple. Mould temperatures below 50 °C create visible knit lines at hole boundaries and reduce weld-line strength by 20–30 % relative to the bulk tensile value. Low mould temperature also reduces gloss consistency on untextured surfaces. High melt temperature above 280 °C should be avoided because degradation volatiles from the butadiene phase produce brown streaking and surface deposits on the mould.

These processing ranges are observations from commercial PC/ABS moulding lines and are not certified C02 machine settings. Start-up trials should use the lowest melt temperature and fill pressure that produce complete packing, then adjust based on short-shot or flash observations under actual runner and gate conditions.

Mould shrinkage measured to ISO 294-4 for unfilled PC/ABS of this class generally falls in the range 0.5–0.7 % in the flow direction and 0.6–0.8 % across flow, depending on wall thickness and packing pressure. Thick sections above 3 mm may exhibit sink marks if packing pressure is removed before gate freeze. Wall thickness changes from 1.2 mm to 3.0 mm in the same part generate differential shrinkage that becomes visible as warpage after ejection. Gate location should place weld lines away from load-bearing snap features; a single gate at the thickest section is preferred for housings, while multiple gates require weld-line impact validation.

Applications for C02 are typically those in which ABS-like processability and PC-like heat resistance are needed but UL 94 V-0 classification is not mandatory. Automotive interior air vent housings and steering column covers processed at melt temperatures near 255 °C benefit from reduced shear viscosity compared with neat PC; however, unpainted parts show lower scratch resistance than glass-filled or coated grades. In appliance housings, C02 may be selected for internal structural brackets exposed to 60–80 °C ambient air where high-gloss appearance is not required. The material is generally not recommended for direct food contact, medical device body contact, or continuous exposure to aqueous alkaline detergents above 60 °C; these limitations should be confirmed against the manufacturer’s declarations.

When used for electronic equipment housings, surface resistivity and volume resistivity are usually characterized by IEC 62631-3-1 or ASTM D257. Unfilled PC/ABS grades typically show volume resistivity above 10^14 Ω·cm at 500 V and surface resistivity above 10^15 Ω; exact C02 values require the supplier’s lot data. These values are sensitive to moisture and surface contamination, so testing should be performed on conditioned specimens at 23 °C/50 % RH.

Paint Adhesion and Low-Temperature Impact as Coupled Variables

Paint adhesion on PC/ABS C02 is influenced by mould release type, solvent selection, and internal stress distribution. Solventborne one-component acrylic or two-component polyurethane paints typically require a surface treatment and a bake cycle that does not exceed 80 °C for unannealed parts; higher bake temperatures may reduce Izod impact by more than 15 % if residual stress is present. Low-temperature ductility, measured by notched Izod at -30 °C, tends to be higher in C-series PC/ABS than in neat ABS but lower than in high-rubber ABS grades. A weld line formed at low mould temperature behaves as a notch and may fail at 5–10 kJ/m² when the bulk material shows 40–50 kJ/m² at 23 °C; therefore structural clips with multiple gates require validation of knit-line location. Published data for this specific configuration is limited, so paint adhesion testing to ISO 2409 or ASTM D3359 and low-temperature impact testing to ISO 180/A are required before production.

Robustness against stress cracking in the presence of solvents is not identical to chemical resistance in neat PC or neat ABS. Aliphatic hydrocarbons and many silicone greases are generally tolerated, but aromatic solvents, ketones, esters, and chlorinated hydrocarbons can initiate crazing under sustained mechanical load. The sensitivity increases when the part contains moulded-in stress from insufficient packing or from sharp internal corners. Chemical compatibility testing to ASTM D543 is applicable for critical housing and clip applications. If a part is exposed to repeated condensation and drying cycles, the moisture uptake of the ABS phase can be 0.2–0.4 % at 50 % RH, which is low but sufficient to alter dimensional stability in precision assemblies.

RoHS compliance should be verified against Directive 2011/65/EU Annex II for lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers at the 0.1 % w/w homogeneous material threshold, or 0.01 % w/w for cadmium. REACH SVHC declarations should be requested from the supplier against the current candidate list. If the intended electrical application requires a UL Recognized Component rating, a UL Yellow Card with the exact grade designation and wall thickness must be obtained; absence of such documentation should not be assumed to indicate failure. Contact with ketones, chlorinated solvents, or strong alkaline solutions above room temperature may cause surface crazing or stress cracking in PC/ABS. Storage life is improved by keeping unopened bags in a dry area at 5–35 °C and away from ultraviolet exposure.