Dongguan Heweigui ABS HWG110 is an acrylonitrile-butadiene-styrene terpolymer sold as an injection-moulding raw material for thin-section enclosures, appliance trim and low-stress functional components. The HWG110 designation is a supplier model code; published product-specific datasheets are not standardised across distribution channels, so the following representative values are drawn from commercially available high-flow ABS grades of the same nominal melt-volume-flow class and should be verified against the lot certificate. The material is not classified as a high-heat ABS or an inherently flame-retardant system unless the certificate explicitly lists those additives.

Which Melt-Volume-Flow Ranges Differentiate HWG110 from Lower-Flow ABS Grades?

High-flow ABS grades are typically specified by melt volume-flow rate under ISO 1133-1:2022 at 220 °C/10 kg. HWG110, when supplied as a standard moulding grade, is expected to fall into the melt volume-flow rate range of 15 cm³/10 min to 25 cm³/10 min; published data for this specific configuration is limited and must be confirmed. Lower-flow general-purpose ABS grades generally exhibit 5 cm³/10 min to 10 cm³/10 min. The increase in flow is obtained by adjusting acrylonitrile-styrene copolymer molar mass and by controlling rubber particle size distribution; it sacrifices some low-temperature toughness and rigidity.

Pre-drying of HWG110 is required at 80 °C for 2 h to 4 h in a desiccant dryer to achieve a residual moisture level at or below 0.05 wt%. In high-humidity environments above 60% RH, drying time is extended toward the upper bound. Melt temperature measured at the nozzle is normally set between 220 °C and 250 °C; mould temperature is held at 40 °C to 70 °C. Too low a mould surface temperature reduces gloss and increases visible knit lines; too high a temperature extends cooling time and can provoke plate-out in unplated grades.

For multi-cavity tools with more than 8 cavities, cavity balance is checked by short-shot progression. When fill imbalance exceeds 5% by part weight, runner diameter or gate land length is adjusted because the shear rate at the gate of a high-flow ABS can exceed 10,000 s⁻¹. Venting depth at the parting line is maintained between 0.02 mm and 0.04 mm; deeper vents create flash because the lower-viscosity melt fills thin gaps rapidly. Weld line strength in HWG110 is typically 60% to 75% of the parent material tensile strength, depending on melt temperature and holding pressure; raising mould temperature to 70 °C extends weld line rehealing time. Gas-assisted and water-assisted injection moulding are possible for hollow profiles, but the higher melt flow of HWG110 requires a narrower gas delay time window of 0.2 s to 0.8 s to avoid gas breakthrough.

The use of regrind is generally limited to 20 wt% to 30 wt% because repeated heat history degrades the butadiene phase and shifts impact downward. Shrinkage anisotropy in an edge-gated rectangular plaque can be 0.4% to 0.7% in the flow direction and 0.5% to 0.8% transverse to flow; post-mould shrinkage at 85 °C for 1 h can add 0.1% to 0.3%. These values are class-typical rather than lot-specific and should be measured on the actual tool using ISO 294-4:2018.

Capillary rheometry at 230 °C shows shear thinning of unfilled high-flow ABS; apparent viscosity may decline from approximately 900 Pa·s at 100 s⁻¹ to 100 Pa·s at 10,000 s⁻¹. These values are representative for the class, not a specification for HWG110. This shear sensitivity means that full flow length is strongly dependent on injection speed and gate shear rate. Processors who set injection pressure-limiting controls too low may not achieve full packing and will see larger part-to-part weight variation. Injection speed should be profiled with a fast initial fill in the runner and gate region, then decelerated to avoid jetting in the cavity. Holding pressure is typically 50% to 70% of peak injection pressure. Back pressure from 0.5 MPa to 1.0 MPa improves melt homogeneity without excessive screw recovery time. Production-scale machines with reciprocating screws of L/D ratio 20:1 to 24:1 and compression ratio 2.0:1 to 2.5:1 provide acceptable plasticating for this rheological class. Barrel residence time should be kept below 6 min at full melt temperature to limit thermal yellowing and rubber phase degradation.

When HWG110 Replaces HIPS in Thin-Wall Electronic Housings

Replacement of high-impact polystyrene in electronic housings is driven by the higher tensile modulus and greater resistance to scratch-induced whitening of ABS. A thin-wall housing with nominal wall thickness of 1.2 mm to 1.8 mm can be filled at lower injection pressure with HWG110 than with a lower-flow ABS; however, compared with HIPS the melt is less forgiving of sharp corners and abrupt wall-thickness transitions. Typical processing windows narrow to ±5 °C in melt temperature when the wall thickness drops below 1.0 mm. HWG110 differs from HIPS by a higher heat deflection temperature under load at 1.8 MPa—generally 75 °C to 85 °C for high-flow ABS versus 70 °C to 78 °C for HIPS—and by greater resistance to vegetable-oil and weak-acid stress cracking. Its trade-off is higher melt viscosity and less generous flow-length capability at equivalent wall thickness compared with HIPS.

Post-moulding operations for HWG110 include hot-plate welding, ultrasonic welding, solvent bonding, painting and vacuum metallisation. For high-gloss painted surfaces, the moulded part is normally cleaned with a non-aromatic solvent wipe and flame-treated to raise surface energy above 38 mN/m before basecoat application. Stress-cracking resistance after painting depends on avoiding aggressive aromatic solvents in the coating; ketone-based thinners and chlorinated hydrocarbons are incompatible and can induce crazing in high-flow ABS at moulded-in strain concentrations. If the component is electroplated, an etch cycle based on chromic acid is used to selectively oxidise the butadiene phase. Processors must verify that the grade selected is a plating-grade ABS; generic HWG110 material may require a plating trial because butadiene distribution influences adhesion peel strength.

Ultrasonic welding of HWG110 to itself uses 20 kHz or 30 kHz equipment; joint amplitude of 30 µm to 60 µm and trigger force of 100 N to 300 N are typical for unfilled ABS. Weld strength is sensitive to moisture; dried parts are preferred to reduce steam bubble formation at the bond line. Laser marking on natural ABS produces a dark mark under 1064 nm Nd:YAG systems; contrast is improved by titanium dioxide-free formulations or by a laser-sensitive additive package. Print adhesion for in-mould labels is determined by surface roughness and surface energy; corona treatment above 40 mN/m improves ink adhesion on flame-retardant-free ABS.

Graft Morphology, Molecular Weight Distribution and Property Trade-Offs

ABS property balance is controlled by polymerising styrene-acrylonitrile in the presence of polybutadiene latex. The rubber phase in high-flow HWG110 is typically present as grafted particles with a bimodal or broad size distribution; larger particles contribute to impact strength, while smaller particles improve gloss and rigidity. Molecular weight distribution of the matrix SAN phase is shifted toward lower molar mass fractions relative to a general-purpose ABS to achieve the higher melt volume-flow rate. This shift produces a lower steady-shear viscosity at 220 °C and 100 s⁻¹. It also reduces the critical thickness for plane-strain fracture; thin sections may remain ductile, while thick sections can fail in a more brittle mode. Higher rubber content can recover some low-temperature impact but lowers modulus and heat resistance. The product is therefore differentiated not by a single maximum property but by the balance of flow, impact and thermal performance demanded in high-cavitation tools.

For comparison against other styrenic materials, HWG110 occupies an intermediate position between high-impact polystyrene and polycarbonate/ABS blends. General-purpose ABS of lower melt flow retains more low-temperature impact and exhibits greater weld line strength; HWG110 compensates with shorter fill time and lower clamp force demand. Polycarbonate/ABS blends offer higher heat resistance and notched impact, often exceeding 35 kJ/m² at 23 °C, but require melt temperatures of 260 °C to 280 °C and predrying at 100 °C or above. HIPS is easier to process at melt temperatures of 200 °C to 230 °C but has lower modulus and lower chemical resistance. The table below summarises the differentiation using representative values for the high-flow ABS class, general-purpose ABS, HIPS and PC/ABS; product-specific data for HWG110 should be verified from the supplier certificate.

HWG110 is not a candidate for continuous load-bearing parts above 80 °C without creep testing under ISO 899-1:2003. It is also incompatible with aromatic hydrocarbons, chlorinated solvents, esters and concentrated oxidising acids; environmental stress cracking can occur at moulded-in strains above 0.5% when contacted by these agents. For outdoor use, UV stabilisation is generally required because unpigmented ABS yellows and loses surface gloss after extended exposure; QUV exposure data should be requested for specific grades. If flame retardancy to UL 94 V-0 at 1.5 mm is required, the unfilled HWG110 baseline is not sufficient unless a flame-retardant system is added. Compliance with RoHS 2011/65/EU and REACH SVHC declarations should be obtained from the supplier for the specific lot.

Environmental stress cracking is evaluated by constant-strain exposure in accordance with ISO 22088-3:2006; high-flow ABS grades tend to crack earlier than lower-flow ABS because the lower matrix molar mass reduces craze stability. Transparent or light-coloured HWG110 parts exposed to isopropanol or hand cream can show surface whitening if moulded-in stress exceeds 2 MPa to 4 MPa; annealing at 80 °C for 2 h can reduce residual stress. However, annealing may lower impact and cause dimensional movement. Published data for this specific configuration is limited; therefore the numerical ranges above should be treated as class-typical boundaries rather than lot-specific specifications.