Dongguan Yiduo ABS 765 is a pelletised acrylonitrile-butadiene-styrene terpolymer supplied under the 700-series designation of Dongguan Yiduo Engineering Plastics Co., Ltd. The product is manufactured for injection-moulding applications in which moderate toughness, dimensional stability, and surface gloss are required at a controlled melt-flow position. The numerical suffix 765 denotes a grade within the producer’s portfolio that is specified for high-flow, thin-wall, fast-cycle moulding rather than for extrusion or high-impact structural components. The polymer consists of a styrene-acrylonitrile continuous phase with a dispersed polybutadiene rubber phase, and the resulting property balance is determined by rubber content, graft morphology, and melt viscosity. The grade is supplied in 25 kg moisture-barrier sacks, with lot certification commonly reporting melt volume-flow rate under ISO 1133-1:2022, Charpy notched impact under ISO 179-1:2010, density under ISO 1183-1:2019, and flammability under UL 94. Because publicly itemised datasheets for this specific configuration are not uniformly distributed, the following data are presented as the supplier’s nominal grade envelope and should not be interpreted as lot-specific guarantee limits.

Does ABS 765 Fit Thin-Wall Injection Moulding Specifications?

The grade is classified as a high-flow ABS on the basis of melt volume-flow rate. Representative values for natural pellets fall between 22 cm³/10 min and 30 cm³/10 min at 220 °C with a 10 kg load when tested to ISO 1133-1:2022. This flow position permits filling of nominal wall sections from 1.2 mm to 2.5 mm in multi-cavity tools, provided gate dimensions and runner balancing are designed for short pressure drops. The associated mechanical and thermal property data are summarised below.

These values place ABS 765 in the general-purpose ABS band rather than in high-impact or high-heat ABS categories. The notched Charpy value at 23 °C indicates a moderate butadiene content, while the drop at -30 °C shows that the grade is not intended for sub-zero load-bearing components. The Vicat softening point below 105 °C requires that sustained service above 80–85 °C be evaluated against creep and load-deflection requirements under IEC 60216 or UL 746B end-use thermal ageing programmes. Published comparative data for this grade against other Dongguan Yiduo ABS types are limited; selection should therefore be confirmed with the current manufacturer datasheet for lot-specific values and updated test dates.

Capillary rheometry at shear rates between 100 s⁻¹ and 5000 s⁻¹ is used for tool design rather than melt-flow-rate alone. At 230 °C, high-flow ABS of this class typically shows shear viscosity in the region of 50–120 Pa·s at 1000 s⁻¹. These values support runner sizing calculations in multi-cavity tools. Hot-runner manifolds for thin-wall enclosures are commonly specified with flow-channel diameters of 8–12 mm on the main manifold and 5–7 mm on valve-gate drops, with the final dimensions derived from shot weight, part geometry, and pressure-drop tolerance.

Thermal Processing Window and Drying Boundaries

Before injection moulding, ABS 765 must be dried to a residual moisture content below 0.05 wt%. A desiccant-bed dryer with a dew point of at least -30 °C and an air volume of 0.8–1.0 m³/h per kg/h is applied. The drying set point is 80 °C for 3–4 h when ambient relative humidity is below 60%. If storage has occurred in non-climate-controlled conditions or relative humidity exceeds 60%, drying time should be extended to 4–6 h. Overdrying above 90 °C or for durations beyond 8 h can yellow the styrene-acrylonitrile phase and should be avoided. Moisture analysis after drying may be performed by ISO 15512:2019 method B or an equivalent Karl Fischer procedure.

Melt preparation is carried out on a reciprocating-screw injection machine with an L/D ratio of 20:1 to 25:1. A three-zone screw with a compression ratio of 2.0:1 to 2.5:1 and a non-return valve of appropriate clearance is used. Indicative barrel zone settings from rear to nozzle are 190–210 °C, 210–220 °C, 220–230 °C, and 225–235 °C. Melt temperature measured by an immersion probe should remain at 220–240 °C. Injection pressure typically falls between 80 MPa and 120 MPa hydraulic, depending on flow length-to-wall thickness ratio. Holding pressure is generally 50–70% of first-stage pressure, with hold time of 3–8 s for wall thickness from 1.5 mm to 2.0 mm. Mould surface temperature is controlled at 40–80 °C, with the upper part of the range used where gloss and weld-line appearance are critical. Back pressure of 0.5–1.0 MPa and screw speed of 60–100 rpm are used to avoid excessive frictional heating.

Processing degradation is a critical boundary for this material. At melt temperatures above 250 °C or with residence times longer than 5 min, the polybutadiene phase can thermally degrade, producing gassing, silver streaks, odour, black specks, and loss of notched impact. Production-scale observation in hot-runner tools indicates that dead spots at manifold ends and poorly balanced drops can generate surface defects even when the barrel temperature remains within specification. Start-up after stoppage should include purging with a suitable styrenic purge compound until discoloured material is eliminated. Regrind addition is generally limited to 20 wt% for appearance parts and up to 30 wt% for non-critical black or internal components. Higher regrind levels reduce melt stability and can increase ash content. Pigmentation should be conducted with a styrene-acrylonitrile carrier masterbatch at 1–3 wt%; loadings above 4 wt% may shift melt volume-flow rate and reduce weld strength. Incompatible additives include high-acid-bearing flame retardants, which can plate out on tool surfaces, and amine-based thermal stabilisers, which may accelerate discolouration during melt residence.

The grade is not inherently UV-stabilised. Parts intended for outdoor exposure require a UV concentrate or coating, and colour matching should be validated after weathering according to ISO 4892-2 or an equivalent programme. Dimensional stability is checked by post-moulding shrinkage under ISO 294-4:2018. Typical mould shrinkage for unfilled ABS of this class is 0.4% to 0.7% in the flow direction and 0.5% to 0.8% across flow, depending on wall thickness, gate freeze time, and mould temperature. These values are not lot-specific and should be validated on a test mould that includes ribs, bosses, and step changes in wall thickness.

The Grade’s Position Is Not Interchangeable with High-Heat or Electroplating ABS

Compared with high-impact ABS grades, ABS 765 has a higher melt-flow rate and better spiral-flow length. A high-impact injection or extrusion grade with an MVR below 10 cm³/10 min may display a notched Charpy impact above 30 kJ/m² at 23 °C but requires higher injection pressure and is less suited to thin-wall filling. The 765 grade exchanges some impact resistance for processability. It should not be specified for thick-section parts requiring high ductility or for components that must remain fracture-resistant below -20 °C.

When compared with heat-resistant ABS grades based on alpha-methylstyrene or maleimide-modified styrene-acrylonitrile, ABS 765 shows a lower Vicat softening temperature. Heat-resistant grades can achieve Vicat softening above 110 °C or even 115 °C, while ABS 765 remains below 105 °C. Applications requiring sustained service above 85 °C under mechanical load should be verified with UL 746B relative thermal index data. Public RTI values for this specific grade are not consistently itemised, so continued-use temperature claims require component-specific testing.

For electroplating ABS, the polymer is formulated with a controlled polybutadiene particle-size distribution and a surface chemistry that permits uniform etching in chromic acid solutions. ABS 765 is not positioned as an electroplating grade. If plating adhesion must meet automotive OEM peel-strength methods or other application-specific requirements, a dedicated electroplating ABS should be selected. The limiting constraint is not melt processing behaviour but poor etch uniformity and delamination risk after plating.

When ABS 765 Is Selected for Indoor Enclosures and Thin-Wall Components

The practical application envelope for Dongguan Yiduo ABS 765 includes indoor injection-moulded enclosures, appliance trim, small appliance housings, thin-wall electrical enclosure parts, and consumer components where UL 94 HB at 1.5 mm is acceptable. Applications requiring translucency, high stiffness at elevated temperature, chemical resistance to ketones, esters, or strong acids, or outdoor weatherability fall outside this grade’s intended use. The material is attacked by concentrated acetic acid, methyl ethyl ketone, and aromatic hydrocarbons; chemical compatibility should be tested according to ISO 175:2010 using the actual service fluid at the maximum use temperature.

For food-contact applications, specific certifications under EU 10/2011 or FDA 21 CFR 181.32 must be confirmed with the supplier. A general-purpose ABS grade should not be assumed compliant without lot-specific declaration. For electrical enclosures, end-product flammability class should be verified at the minimum wall thickness and final colour because pigment packages can alter UL 94 performance. In comparison with polycarbonate/ABS blends, the 765 grade has lower heat resistance and lower notched impact. In comparison with medium-impact ABS grades in the same supplier family, the 765 grade’s higher flow makes it more suited to multi-cavity tools with long flow paths but less suitable for components requiring high toughness or elevated-temperature rigidity. The selection boundary is therefore defined by the combination of melt flow, notched impact, Vicat softening, surface gloss, and end-use regulatory requirements, with the specified test methods forming the specification basis.