Dongguan Haohan Plastic PC/ABS JH3006C（2） is an unfilled polycarbonate/acrylonitrile-butadiene-styrene alloy supplied for injection-moulded structural parts that require a controlled balance of low-temperature ductility, heat resistance, and melt processability on equipment running below polycarbonate homopolymer temperatures. The model designation JH3006C（2） is a supplier-specific grade identifier; the parenthetical numeral may indicate a packaging or colouring variant and should be confirmed against the supplier certificate of analysis. The material is not a polymer blend containing glass fibre, mineral filler, or halogenated flame retardant. It belongs to the medium-flow unfilled PC/ABS class, and published reference data for that class place melt volume-flow rate under ISO 1133-1:2022 at 260 °C/5.0 kg between 8 cm³/10 min and 20 cm³/10 min. The polycarbonate phase contributes tensile modulus and heat deflection, while the ABS phase reduces warpage and improves processing latitude. Published multi-lot data for this exact grade are limited; therefore, the values in this document are representative public ranges for unfilled medium-flow PC/ABS and must not replace lot-specific test documentation.

What Drying and Melt Preparation Requirements Apply Before Injection Moulding?

Moisture control is the primary processing boundary condition. Unfilled PC/ABS absorbs atmospheric moisture, and processing at moisture contents above 0.02 wt% can generate splay, silver streaks, and molecular weight reduction through hydrolysis of the polycarbonate phase. A desiccant-bed dryer with supply-air dew point of -30 °C or lower is required. Drying at 80 °C to 100 °C for 3 h to 4 h is specified for opened bags that have been exposed for more than 30 min. In production areas above 60 % relative humidity, hopper residence time should not exceed 8 h unless a closed-loop conditioned-air hopper is used. Melt temperature measured at the nozzle should remain between 250 °C and 275 °C. Residence above 280 °C or total melt residence times beyond 10 min can generate dark specks and reduce notched impact strength. Mould surface temperature is normally maintained between 60 °C and 90 °C. Settings below 60 °C can produce flow hesitation and poor surface replication; settings above 100 °C may extend cycle time without proportional improvement in gloss or weld-line strength.

Twin-screw compounding of unfilled PC/ABS in the 8 cm³/10 min to 20 cm³/10 min melt-flow band has been documented on lines with L/D ratios from 36:1 to 44:1. The ABS component is commonly side-fed after the PC melting zone to limit thermal history on the butadiene phase. For injection moulding, screw compression ratio should be 2.0:1 to 3.0:1, and back pressure should be held between 0.3 MPa and 0.7 MPa. Sustained back pressure above 1.0 MPa can increase shear heating and degrade the elastomeric phase. Shot weight should be 40 % to 75 % of barrel capacity. Below 40 % capacity, residence-time distribution widens and light-colour parts may show yellowing. Capillary rheometry on unfilled PC/ABS of this class indicates pseudoplastic behaviour: apparent viscosity at 260 °C and 1000 s⁻¹ is generally 180 Pa·s to 250 Pa·s, rising to 400 Pa·s to 600 Pa·s at 100 s⁻¹. The power-law index is typically 0.35 to 0.50. For a 1.5 mm nominal wall section, fill time should be 0.4 s to 0.8 s to avoid premature flow-front freeze-off.

When Medium Flow and Low-Temperature Ductility Define the Selection Window

Selection of JH3006C（2） rather than a high-heat PC/ABS or a mineral-filled PC/ABS occurs when the component must fill wall thicknesses between 1.2 mm and 2.5 mm without exceeding injection pressures of 120 MPa, and when the part must retain impact resistance at -30 °C without a separate elastomer-rich modifier. In this unfilled PC/ABS class, tensile stress at yield under ISO 527-2:2012 is commonly 50 MPa to 60 MPa, tensile modulus is 2100 MPa to 2500 MPa, and notched Charpy impact at 23 °C under ISO 180:2023 is 35 kJ/m² to 55 kJ/m². Test specimens are conditioned at 23 °C and 50 % relative humidity for at least 40 h under ISO 291:2008. Heat deflection temperature at 1.8 MPa under ISO 75-2:2020 is generally 100 °C to 118 °C, which is below polycarbonate homopolymer but adequate for painted interior trim, enclosures, and brackets exposed to localised temperatures up to 85 °C.

The tabulated values are public reference ranges for unfilled medium-flow PC/ABS, not certified lot-specific values for JH3006C（2）. A supplier certificate of analysis should be obtained for production qualification, and specimen preparation should follow the exact conditioning and test-speed provisions in the cited standards.

Differential Formulation Constraints Against Flame-Retardant and High-Heat PC/ABS Grades

JH3006C（2） differs from flame-retardant PC/ABS in that no phosphate ester or brominated flame-retardant system is intentionally added. Flame-retardant PC/ABS grades may be classified UL 94 V-0 at 1.5 mm, but phosphate plasticisation can reduce heat deflection temperature below 95 °C at 1.8 MPa and increase mould deposit formation in hot-runner systems maintained above 260 °C. High-heat PC/ABS grades incorporating α-methylstyrene-based SAN raise Vicat softening temperature above 130 °C under ISO 306:2022, but their melt volume-flow rate at 260 °C/5.0 kg may fall below 6 cm³/10 min, increasing injection pressure requirements by 20 % to 35 % in multi-cavity tools. Compared with mineral-filled PC/ABS, JH3006C（2） has lower flexural modulus and higher elongation at break. Mineral-filled PC/ABS can achieve flexural modulus above 3000 MPa, but notched Charpy impact at -30 °C may fall below 6 kJ/m², making it unsuitable for cold-impact interior mounts. Compared with general-purpose extrusion PC/ABS, the injection-moulding designation JH3006C（2） is expected to have a narrower molecular weight distribution to reduce warpage and improve knit-line strength, although published comparative size-exclusion chromatography data for this exact grade are limited.

The unfilled composition also affects shrinkage and post-moulding dimensional movement. Unfilled PC/ABS in this class typically exhibits parallel flow shrinkage of 0.5 % to 0.7 % and perpendicular flow shrinkage of 0.5 % to 0.8 % when measured under ISO 294-4:2018. Shrinkage anisotropy is lower than that of glass-fibre-reinforced grades, which can show a parallel-to-perpendicular shrinkage ratio exceeding 3:1. For painted parts, unfilled PC/ABS also avoids fibre read-through on Class A surfaces. The absence of mineral filler minimises tool wear, but the mould should still use hardened steel or stainless tooling for production runs above 500 000 cycles because of abrasive pigments or release agents that may be present in specific colour-matched lots.

Application environments include interior structural brackets, electronic device enclosures, painted bezels, and plated or solvent-bonded subassemblies. Adhesion of polyurethane and acrylic coatings is evaluated under ASTM D3359-17 cross-cut tape test; unfilled PC/ABS with surface energy above 40 mN/m after corona or plasma treatment generally meets classification 5B. Solvent bonding to itself or to PC substrates is performed with methyl ethyl ketone or dichloromethane-based cement. Because the butadiene phase contains unsaturation, exposure to aromatic or ketone solvents above 40 °C should be limited to avoid stress crazing in regions with moulded-in stress. Thermoforming of extruded sheet from the same resin family is possible at wall thicknesses above 2.0 mm, with sheet surface temperature maintained between 150 °C and 170 °C; published data for this specific configuration is limited and should be validated on production tooling.

Mould Filling, Gate Freeze-Off, and Clamp Force Boundaries

Flow length in unfilled PC/ABS of this melt-flow class is approximately 0.8 mm to 1.0 mm per MPa of injection pressure for a 2.0 mm wall. For a 150 mm flow path, required hydraulic pressure can therefore exceed 180 MPa if the gate is undersized or melt temperature is below 240 °C. Gate land length should not exceed 0.5 times gate diameter, and valve-gated hot-runner nozzles should be set at 250 °C to 270 °C. Clamp force for multi-cavity tooling is calculated from projected part area; at a cavity pressure of 40 MPa, approximately 4 kN of clamp force is required per cm² of projected area. Hot-runner drops should avoid dead spots because residence above 10 min at 270 °C can produce black specks. After colour changes, purge intervals of 50 shots are typical in production troubleshooting literature for this resin family.

Injection speeds below 60 mm/s have been associated with hesitation marks and incomplete packing on thin-wall sections below 1.2 mm. Holding pressure below 40 MPa can cause gate freeze-off before packing is complete, especially with subgates or tunnel gates of diameter below 0.8 mm. Mould filling simulations should use melt density of approximately 1.0 g/cm³ at processing temperature and solid density of 1.10 to 1.14 g/cm³. The thermal conductivity of unfilled PC/ABS is generally 0.20 W/(m·K) to 0.25 W/(m·K), which slows core cooling in thick sections; mould cooling channels should be sized to maintain a temperature differential below 10 °C across the tool face.

Regulatory documentation for JH3006C（2） should confirm the presence or absence of substances listed in REACH Regulation (EC) No 1907/2006 as amended and RoHS Directive 2011/65/EU Annex II restricted substances. Ash content is determined under ISO 3451-1:2019; unfilled PC/ABS normally yields ash below 1.0 %. Moisture analysis is performed by Karl Fischer titration under ISO 15512:2019 or a thermogravimetric moisture balance calibrated to 0.01 wt% sensitivity. Because the grade contains butadiene-based rubber, prolonged exposure to ultraviolet radiation without UV stabilisation or coating leads to surface oxidation and gloss reduction. Components exposed to direct sunlight should be painted or use a UV-stabilised protective coating. Published compositional data for the specific antioxidant and release-agent package in JH3006C（2） are limited; therefore, adhesive bonding and coating compatibility should be verified on moulded plaques using the intended production paint line and ASTM D3359-17 cross-cut tape test.