Dongguan Dahe ABS PC 98736 is identified as an unfilled acrylonitrile-butadiene-styrene/polycarbonate (ABS/PC) alloy supplied in pellet form for injection molding and extrusion conversion. The product class occupies a formulation space between amorphous ABS and polycarbonate through a morphology in which the SAN phase limits melt viscosity while dispersed or co-continuous polycarbonate contributes thermal stability and impact resistance. Publicly available product-specific datasheet values for this exact designation are limited; where numerical ranges are provided below, they are derived from commercial unfilled ABS/PC injection-molding alloys of equivalent density and rubber-modifier architecture and should not be read as batch-certificate values. Class-level melt volume-flow rate is commonly measured at 260 °C under 5.0 kg load in accordance with ISO 1133-1:2022 and typically falls between 12 cm³/10 min and 25 cm³/10 min. Density measured by ISO 1183-1:2019 is commonly 1.12 g/cm³ to 1.15 g/cm³, and tensile yield strength of injection-molded type 1A specimens under ISO 527-2:2012 is typically 45 MPa to 60 MPa.

How does Dongguan Dahe ABS PC 98736 differ from unalloyed ABS and neat polycarbonate?

Unalloyed ABS typically exhibits a heat deflection temperature at 1.82 MPa between 70 °C and 90 °C under ISO 75-2:2013, and notched Izod impact strength below 30 kJ/m² at 23 °C under ISO 180:2019, depending on butadiene content. Neat polycarbonate can exceed 125 °C at the same load and 55 kJ/m² notched Izod, but it requires elevated melt temperatures and is hydrolytically sensitive. The 98736 product class typically occupies an intermediate position: heat deflection temperature at 1.82 MPa between 95 °C and 120 °C, notched Izod impact strength from 30 kJ/m² to 55 kJ/m², and practical melt temperatures 40 °C to 60 °C lower than those common for neat polycarbonate. Compared with glass-fiber reinforced ABS/PC grades, the unfilled class has lower tensile modulus but generally better weld-line elongation. Compared with flame-retarded PC/ABS compounds, the 98736 designation should not be assumed to provide a UL 94 V-0 rating unless a batch-specific certification exists; published data for this specific configuration is limited.

A reference property envelope for unfilled ABS/PC alloys of this density class is shown in Table 1. The values are not product-specific quality limits for Dongguan Dahe ABS PC 98736.

On single-stage injection molding lines with clamp force capacities between 1500 kN and 3000 kN and general-purpose screw L/D values of 20:1 to 25:1, the alloy should be pre-dried before plasticizing. Desiccant drying at 80 °C to 100 °C for 3 h to 4 h with a hopper-air dew point of -40 °C or lower is typical; storage above 60 % relative humidity requires moisture verification because residual moisture above 0.02 % hydrolyzes the polycarbonate phase and generates splay, weld-line weakening, and loss of molecular weight. Barrel temperatures for class-level materials often start at 230 °C in the rear zone and rise to 260 °C to 270 °C at the nozzle. Mold temperatures should be held between 60 °C and 90 °C unless texture replication or low-gloss requirements dictate a narrower window. Injection speed and pack pressure are set to prevent delamination between the polycarbonate-rich skin and ABS-rich core; cushion stability and screw recovery time are monitored to hold melt residence time below 8 min and avoid yellowing of the polycarbonate phase.

For twin-screw compounding or re-extrusion of 98736-class pellets, melt temperature at the die is typically maintained below 280 °C to limit butadiene-rubber degradation and polycarbonate chain scission. High-shear dispersion of the polycarbonate-rich phase within the SAN matrix is necessary for uniform impact response; a screw design with L/D 40:1 and vacuum venting at -0.08 MPa gauge is used in production-scale alloying lines to remove residual moisture and low-molecular-weight volatiles. When regrind is incorporated, the addition level is normally held at 20 wt% or lower for injection molders because higher regrind fractions reduce notched impact strength and increase lot-to-lot variability at weld lines. Residual moisture is often verified with Karl Fischer titration or a moisture analyzer calibrated for PC/ABS pellets; a reading above 0.02 % is considered a rejection limit for class-level materials. Published data for this exact 98736 designation is limited, but the hydrolysis sensitivity of the polycarbonate phase justifies drying verification.

Melt viscosity data measured by capillary rheometry at 260 °C indicate a shear-thinning profile typical of PC/ABS blends. Apparent viscosity at 100 s^-1 may be in the range 800 Pa·s to 1200 Pa·s, while at 1000 s^-1 it may fall to 250 Pa·s to 450 Pa·s. These values are point estimates from class-level published data, not batch-specific 98736 measurements. The non-Newtonian behavior requires injection pressure calculations to use shear-rate-corrected viscosity rather than zero-shear values. Rheological boundaries for thin-wall filling are established with spiral-flow or cavity-pressure measurements. For an unfilled ABS/PC alloy in the 12 cm³/10 min to 25 cm³/10 min MVR class, flow-length-to-wall-thickness ratios of 150:1 to 220:1 are attainable at 80 MPa injection pressure and 70 °C mold temperature in a rectangular-edge gate tool. These figures are equipment-dependent and should be verified on a specific hot-runner or cold-runner mold. When wall thickness falls below 2.0 mm, pack-pressure decay and gate freeze time become the dominant variables governing sink and warp.

When the mold temperature is held below the effective glass transition of the polycarbonate-rich phase

Mold temperatures below approximately 50 °C force the polycarbonate-rich phase to solidify before complete packing can occur. The result is a frozen-in anisotropic stress profile that lowers weld-line strength and increases susceptibility to environmental stress cracking. For structural snap-fit features and thin-wall bosses, mold temperatures in the upper end of the 60 °C to 90 °C range are preferred. Conversely, mold temperatures above 95 °C can extend cycle time and produce sink marks over ribs unless pack pressure and hold time are increased. Shrinkage after 24 h for unfilled ABS/PC alloys of this class is typically 0.5 % to 0.7 % in the flow direction and 0.5 % to 0.8 % transverse when measured on plaques per ISO 294-4:2018; processors should verify shrinkage on the actual cavity geometry because gate size and packing pressure shift the values.

Weld-line strength reductions are commonly quantified by comparing notched Izod values at weld-line specimens with unwelded controls. A weld-line retention factor below 50 % under ISO 180:2019 indicates that gate location, melt temperature, or mold temperature should be adjusted. Tool design for unfilled ABS/PC alloys in this class should use generous radii and balanced flow paths to minimize notch sensitivity. Sharp corners below 0.5 mm radius can act as stress concentrators in impact-loaded housing bosses and increase crack initiation. Gate placement near thick sections and away from weld-line-prone features improves field performance. In hot-runner systems, thermal homogeneity within the manifold is maintained to avoid pre-solidification in cold spots; shear rates below 50,000 s^-1 are often targeted to avoid melt fracture at gate entry.

Chemical compatibility evaluations for ABS/PC alloys concentrate on polycarbonate-phase hydrolysis and ester/amine attack. Primary and secondary amines, strong alkaline cleaning solutions, aromatic hydrocarbons, ketones, and ester-based plasticizers can reduce molecular weight or cause environmental stress cracking. Color concentrates or flame-retardant masterbatches with amine-bearing carrier resins should be avoided unless melt-flow stability and notched impact values are verified under ISO 1133-1:2022 and ISO 180:2019. For components exposed to cleaning fluids or automotive interior surface conditioners, stress-cracking resistance can be screened with ISO 22088-2:2006 at constant tensile strain or ASTM D543-20. The product class also exhibits limited chemical resistance to windshield washer fluids and polyglycol-based brake fluids; therefore, under-hood or exterior applications require specific compatibility validation. Published data for this specific 98736 configuration in such fluids is limited; qualification on production tooling is required before release.

Unfilled ABS/PC alloys of the 98736 class are used in uncoated electrical enclosure frames, appliance housing components, non-patient-contact medical equipment housings, and automotive interior trim substrates where dimensional stability under load is balanced against low-temperature impact. For snap-fit and clip features, a notched Charpy impact strength above 35 kJ/m² at 23 °C under ISO 179-1:2010 is commonly used as a screening threshold. For thin-wall parts below 2.5 mm wall thickness, notched Izod comparisons should be supplemented with instrumented puncture testing per ISO 6603-2:2000 to capture ductile-to-brittle transitions that single-point Izod values may miss. Polycarbonate-rich alloys can be painted after surface treatment, but solventborne coatings with aggressive ketone or ester carriers may attack the surface if flash-off is inadequate. Waterborne coatings with VOC content below 50 g/L and oven cure temperatures below 80 °C are typically used for ABS/PC automotive interior components to reduce stress cracking. Parts requiring low-gloss, painted class-A surfaces or vacuum metallization may require mold texture maintenance and adhesion promoters verified under ISO 2409:2020 cross-cut adhesion testing; published data for this exact product is limited.

Weathering, flammability, and regulatory benchmarks for unfilled ABS/PC housings

For indoor applications, UV exposure is not the limiting factor; for outdoor or sun-through-glass applications, the polycarbonate phase can yellow and the butadiene phase can embrittle unless UV stabilizers are part of the grade. Product-specific data for 98736 is limited, so outdoor qualification should use accelerated weathering under ISO 4892-2:2013 or ASTM G154-23. In flammability evaluations, unfilled ABS/PC compounds are frequently rated HB rather than V-0; a UL 94 V-0 rating at 1.5 mm should not be assumed for this designation without batch-specific certification. Compliance documentation for electrical and interior automotive components typically includes RoHS Directive 2011/65/EU Annex II substance restrictions, REACH Regulation EC No 1907/2006 SVHC concentration below 0.1 wt% per article, and IEC 62321 test methods for hazardous substance screening.

Table 2 summarizes regulatory and test designations commonly applied to ABS/PC injection-molding compounds in electrical and interior automotive service. Inclusion does not constitute a product certification.