Shanghai Jinhu Rili ABS PC HAC8260 is a melt-compounded acrylonitrile-butadiene-styrene/polycarbonate alloy supplied in pellet form for injection molding and extrusion. The grade is specified where a higher heat deflection temperature than general-purpose ABS and lower melt viscosity than polycarbonate homopolymer are required. The polycarbonate phase contributes rigidity, thermal resistance, and notched impact strength; the ABS phase contributes processability, low-temperature ductility, and reduced injection pressure during cavity filling. Typical usage includes unpainted and painted automotive interior trim, electrical control housings, power tool casings, and thin-wall electronic enclosures where dimensional stability after molding is critical. The melt flow condition commonly applied to this alloy class is 260 °C with 5 kg mass according to ISO 1133-1:2022. Published data for this specific configuration is limited in publicly accessible sources; the numerical profiles in this document are class-typical ranges for medium-flow ABS/PC alloys and must be checked against the supplier’s certificate of analysis for lot-specific values. Equivalent ASTM designations frequently cited for North American specifications include ASTM D638-14 for tensile properties and ASTM D256-23 for notched Izod impact.

What Mechanical and Thermal Property Ranges Define This Product Class?

The class-typical property envelope for HAC8260 is characterized by a density of 1.10–1.16 g/cm³ and a melt flow rate of 8–15 g/10 min at 260 °C/5 kg. Tensile stress at yield is typically 45–55 MPa with elongation at break of 30–70 % when tested at 23 °C according to ISO 527-2. Flexural modulus is generally 2,000–2,400 MPa under ISO 178. Notched Izod impact strength at 23 °C falls between 40 kJ/m² and 60 kJ/m² by ISO 180/A; at -30 °C, the range is 30–45 kJ/m². Thermal resistance is reported as a Vicat softening temperature of 120–135 °C by ISO 306/B50 and a heat deflection temperature of 95–110 °C at 1.8 MPa by ISO 75-2/A. Equilibrium moisture absorption at 23 °C and 50 % relative humidity is 0.2–0.4 % by ISO 62. Specimens are conditioned at 23 °C and 50 % relative humidity before mechanical testing.

When HAC8260 Is Substituted for Medium-Heat ABS in Thin-Wall Housings

The substitution of HAC8260 for medium-heat ABS imposes a narrower processing window because the polycarbonate phase undergoes hydrolytic chain scission at moisture contents above 0.02 wt% and the butadiene phase undergoes thermo-oxidative degradation above 270 °C. Pre-drying in a desiccant dryer with a dew point below -30 °C at 80–90 °C for 3–4 h is required when ambient relative humidity exceeds 60 %. Drying should not exceed 8 h to avoid yellowing. Residual moisture should be verified by Karl Fischer titration or a calibrated moisture analyzer, not by visual pellet appearance. Melt temperature at the nozzle should be maintained between 240 °C and 270 °C. Lower melt temperatures reduce thermal degradation but increase injection pressure and may freeze the polycarbonate-rich skin prematurely, causing delamination or splay. Higher melt temperatures increase flow length but accelerate degradation of the butadiene phase; residence time above 270 °C should not exceed 5 min in the barrel. Mold temperature should be held between 60 °C and 90 °C. Mold temperatures below 50 °C reduce surface gloss and may increase molded-in stress. For thin-wall sections below 1.2 mm, mold temperature at the upper end and injection velocity above 200 mm/s may be required to fill the cavity before the skin freezes. Injection molding machines with 20:1 to 24:1 L/D general-purpose screws and shut-off nozzles are suitable; open nozzles may drool because of the alloy’s lower melt viscosity relative to PC homopolymer. Hydraulic injection pressure between 80 MPa and 140 MPa is typically sufficient, but optimized packing pressure is more important than peak pressure to minimize sink marks and warpage. Packing pressure is commonly maintained at 50–70 % of peak injection pressure. Clamp force requirements for thin-wall moldings are commonly 3–5 kN/cm² of projected area. Avoid combinations with amine-based additives, PVC, acetal, and zinc-based heat stabilizers because these species can attack the polycarbonate phase, generate acidic degradation products, or catalyze chain scission. Regrind from sprues and runners may be reintroduced up to 20 wt%, provided the regrind is dried and free of contamination; repeated heat history above 20 wt% reduces impact strength and darkens the melt.

Before coating or bonding, the molded surface of HAC8260 must be evaluated for contamination from mold release agents because polycarbonate-rich skins are sensitive to hydrocarbon-based external release sprays. Solvent-borne two-component polyurethane coatings with chlorinated polyolefin adhesion promoters are commonly applied to ABS/PC alloy surfaces; adhesion is assessed by cross-cut tape testing according to ISO 2409 or ASTM D3359-17. The alloy has limited resistance to ketones, esters, and chlorinated solvents; aromatic hydrocarbons induce stress cracking in molded parts under residual stress. Environmental stress cracking resistance should be evaluated according to ASTM D543-21 or ISO 22088-3 using bent-strip specimens. Annealing at 80 °C for 1 h may be used to reduce molded-in stress before exposure to aggressive cleaners or paint solvents. For exterior applications, UV stabilization is required because the butadiene phase undergoes photo-oxidative degradation on prolonged exposure; accelerated weathering is assessed by ISO 4892-2 or ASTM D2565-16.

Morphology-Driven Property Differences from Other ABS/PC Grades

The performance difference between HAC8260 and unmodified ABS originates in the dispersed polycarbonate phase and the co-continuous morphology that develops during compounding. General-purpose ABS typically has a heat deflection temperature at 1.8 MPa of 80–95 °C; the ABS/PC alloy class containing HAC8260 raises that value to 95–110 °C without glass fiber reinforcement. Notched Izod impact at 23 °C increases from 15–30 kJ/m² for ABS to 40–60 kJ/m² for the alloy class. At -30 °C, retained impact strength remains above 30 kJ/m² in the alloy class, whereas many ABS grades drop below 10 kJ/m². Compared with polycarbonate homopolymer, the alloy shows lower melt viscosity at 260 °C, reducing injection pressure and improving flow length in thin ribs. The trade-off is lower heat deflection temperature: PC homopolymer typically reaches 120–135 °C at 1.8 MPa, whereas the alloy class is limited to 95–110 °C. The alloy also shows better resistance to environmental stress cracking from aliphatic hydrocarbons but lower resistance to aromatic solvents than PC homopolymer. Differences among ABS/PC grades are governed by the PC-to-ABS ratio, butadiene rubber particle size, and additive package. High-PC grades with PC content above 60 wt% show higher Vicat softening temperatures of 130–140 °C but require melt temperatures of 270–290 °C and yield longer cooling times. Mineral-filled ABS/PC grades offer higher flexural modulus, typically 3,000–4,500 MPa, but sacrifice impact strength and surface quality. Flame-retardant grades may achieve UL 94 V-0 at 1.5 mm but often use phosphorus-based additives that reduce heat deflection temperature and require lower processing temperatures to avoid degradation. The alloy class is typically compounded on twin-screw extruders with L/D 40:1 and vacuum devolatilization; the screw design must limit peak melt temperature below 280 °C to avoid degradation of the butadiene phase.

In incoming material qualification, the melt flow rate is measured according to ISO 1133-1:2022 at 260 °C/5 kg; a deviation greater than ±10 % from the supplier’s reference value indicates a shift in PC-to-ABS ratio or thermal degradation during compounding. Density is checked by ISO 1183-1. Moisture content is determined by Karl Fischer titration before processing. Tensile and Izod specimens are molded according to ISO 527-2 and ISO 180/A to verify that the lot falls within the agreed mechanical property window. Melt flow rate drift above ±10 % between lots may produce visible flow-line differences in molded parts. Regulatory compliance for the alloy class is typically documented through REACH SVHC declarations and RoHS screening for lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE; certificates for HAC8260 must be obtained from Shanghai Jinhu Rili. The product is not recommended for food-contact or medical applications without additional certifications and extractables testing.

For outdoor exposure, unpainted HAC8260 should be considered UV-limited unless a weather-resistant capstock, paint, or UV stabilizer package is specified. Accelerated weathering by ISO 4892-2 shows that unpigmented ABS/PC alloys can develop surface chalking and a reduction in impact strength after 1,000 h of xenon-arc exposure; actual performance depends on pigment grade and UV absorber concentration. Parts with thick walls above 3 mm should be designed with uniform wall thickness to avoid differential cooling stresses, because the alloy shrinks less than ABS but more than PC homopolymer. The typical mold shrinkage for the class is 0.4–0.7 % determined according to ISO 294-4, and cavity dimensions should be validated on the intended tool before production release.