Dongguan Haiyue ABS 800-LG is a low-gloss injection-moulding grade of acrylonitrile-butadiene-styrene specified for applications where reduced surface glare, balanced impact resistance, and medium flow length are required. The designation is supplier-specific and does not replace the ISO 2580-1 classification that a compounder or moulder may require for material substitution. Because published data for this exact grade configuration is limited, procurement should be tied to a lot-specific certificate of analysis and to the supplier’s technical datasheet. Representative values for this class of ABS are: melt volume-flow rate 12 to 24 cm³/10 min at 220 °C and 10 kg to ISO 1133-1; density 1.03 to 1.06 g/cm³ to ISO 1183-1; tensile yield stress 40 to 50 MPa to ISO 527-2; flexural modulus 2100 to 2600 MPa to ISO 178; and Charpy notched impact strength 16 to 28 kJ/m² at 23 °C to ISO 179-1/1eA. These figures are class-typical and must not be interpreted as guaranteed minima for ABS 800-LG.

Material Constitution and Specification Benchmarks

The product is composed of a styrene-acrylonitrile copolymer continuous phase, grafted polybutadiene rubber particles, and a small fraction of processing stabilizers. The low-gloss character originates primarily from the rubber particle size distribution and from the micro-roughness generated at the mould surface, not necessarily from an external matting filler alone. Incoming resin should be characterized for melt volume-flow rate, density, ash content, moisture, and yellowness index. Batch-to-batch variation in low-gloss grades is commonly observed in the rubber particle size distribution and grafting ratio; incoming inspection should therefore include a 60° gloss plaque measurement on a standard smooth tool to detect lot shifts before production. For injection moulders, the following representative ranges provide an incoming inspection window for this class of ABS.

The values above are derived from class-typical data for low-gloss ABS injection grades, not from a guaranteed specification for Dongguan Haiyue ABS 800-LG. Where a property is release-critical, the lot-specific certificate of analysis controls.

For pre-processing, moisture control is the first boundary condition. ABS 800-LG should be predried in a desiccant hopper dryer supplying air at 80 °C to 90 °C, with a dew point of -30 °C or lower and residence time of 2 to 4 h. In plants where ambient relative humidity exceeds 60 %, closed-loop desiccant drying is mandatory, and open hot-air hoppers are insufficient because surface moisture can persist and generate volatiles at melt temperature. Residual moisture should be verified below 0.05 % by ISO 15512 Karl Fischer or equivalent before plastication. Failure to meet this condition produces splay, silver streaks, and irregular surface dullness across textured surfaces. Central vacuum conveying lines should be purged between resin changes to avoid cross-contamination with polycarbonate or polyamide regrind; isolated hoppers and dedicated lines reduce this risk on production-scale systems.

What Processing Envelope Is Required for Injection Moulding?

For reciprocating-screw injection moulding machines, a screw with an L/D ratio of 20:1 to 24:1 and a compression ratio of 2.0:1 to 2.5:1 provides acceptable plastication. The barrel temperature profile is normally set from 200 °C at the rear zone to 240 °C at the nozzle, with melt temperature measured at the nozzle between 220 °C and 250 °C. If the melt temperature is held below 220 °C, moulded low-gloss surfaces can develop flow lines and jetting on textured cavities; above 250 °C, the butadiene phase may begin generating degradation products that appear as brown streaks and increase 60° gloss on smooth surfaces. Mould temperature should be controlled between 40 °C and 80 °C depending on wall thickness and surface texture. Higher mould temperatures within that range improve replication of fine texture and reduce weld-line visibility, but can increase cycle time and may raise gloss on smooth regions.

Injection pressure depends on flow length, wall thickness, and gate design; hydraulic peak pressures of 70 to 120 MPa are typical for thin-wall components, while clamp force is scheduled at 3 to 5 kN/cm² of projected area. Back pressure is maintained at 0.5 to 1.5 MPa to stabilize melt density without excessive shear heating. Screw surface velocity should be limited to 0.2 to 0.5 m/s for uniform melting. Short cushion distances of 3 to 6 mm are maintained to ensure effective holding-pressure transfer. Holding pressure is typically 50 to 70 % of peak injection pressure for 3 to 10 s depending on gate freeze-off. These values are process engineering starting points, not validated processing windows for every tool; process capability studies should be performed with the actual mould and machine.

At the melt delivery stage, the material follows pseudoplastic shear-thinning behaviour; apparent viscosity decreases as screw rotation and injection speed increase. Capillary rheometry to ISO 11443 is recommended for obtaining the viscosity coefficients used in Moldflow or Moldex3D simulation of ABS 800-LG. Hot-runner manifold temperature should not exceed 250 °C, and total residence time in the melt delivery system should be kept below 5 min; during unscheduled interruptions, barrel temperatures in the front zones may need to be reduced to 200 °C until restart. Regrind addition up to 20 % by weight is common for non-appearance parts, but low-gloss surface stability can be affected by particle size distribution changes in the regrind fraction; incoming regrind should be sieved and blended uniformly. When mould-filling simulation is performed, the low-gloss surface texture should be modelled as part of the cavity roughness because it alters melt front resistance and weld-line position.

When Low Gloss Becomes a Specification Variable in Interior Trim

Low gloss is not a single material property; it depends on cavity texture, mould temperature, cavity pressure at end of fill, and the rubber particle size distribution in the resin. When a part specification requires a 60° gloss value, measurement should follow ASTM D523 or ISO 2813 on a flat representative region of the moulded part, not on the raw pellet. Textured surfaces can show 60° gloss values below 20 GU, while smooth plaques from the same lot may read between 20 and 45 GU depending on mould temperature and tool polish. A change of 5 °C in mould temperature can shift gloss by several gloss units on shallow-textured cavities. For this reason, gloss specifications for ABS 800-LG should reference the exact cavity texture number, moulding machine, and measurement location. Process capability studies should include at least 30 shots for gloss stability after the process has reached thermal equilibrium.

The low-gloss character of this grade is generated by a combination of rubber particle size distribution and surface micro-roughness; therefore, high gate shear and excessive melt temperature can orient the surface layer and increase gloss. Melt front velocities above 300 mm/s on textured surfaces may increase gloss variability; this is a general observation for ABS, not a supplier specification. Gate sizes and injection profiles should avoid jetting. Weld lines in low-gloss ABS can appear as bright lines even when mechanical strength is adequate; placing weld lines in obscured areas or using sequential valve gating reduces this visual defect.

Application selection for ABS 800-LG follows from its balance of low surface gloss, medium melt flow, and practical impact resistance. In automotive interior trim, the grade may be specified for lower instrument panel components, glove box doors, knee bolsters, centre console side panels, HVAC louvers, and seat back covers where reduced glare under windscreen sunlight is required. Such components must be validated for vehicle-specific requirements such as FMVSS 302 or ISO 3795 horizontal burning rate, and dimensional stability after heat ageing to OEM standards. In appliance housings and consumer electronics, the material may be used for vacuum cleaner housings, air purifier panels, monitor rear covers, and printer side panels where a controlled matte surface reduces visible fingerprints and scratches. For electrical enclosures, standard ABS generally carries UL 94 HB at the relevant thickness; if a UL 94 V-0 rating is required, flame-retardant ABS or PC/ABS should be substituted because ABS 800-LG is not positioned as a flame-retardant grade. Outdoor applications require a UV stabilization package and painted or film-laminated surfaces because unmodified ABS can embrittle under extended ultraviolet exposure.

Regulatory acceptance of ABS 800-LG must be confirmed at the lot level. Suppliers typically provide REACH compliance under EU 1907/2006 and RoHS compliance under EU 2011/65/EU, but these are legal declarations, not engineering property data. If direct food-contact use is required, documentation under 21 CFR 177.1020 must be obtained; standard injection grades are not automatically compliant. The material is not recommended for outdoor unpainted service because the polybutadiene phase can undergo photo-oxidation and surface embrittlement. It is also not intended to replace polycarbonate or PC/ABS in applications requiring continuous service above 100 °C or low-temperature impact below -20 °C unless specific validation data are available. These boundaries define substitution limits, not general product shortcomings.

Differentiating ABS 800-LG from High-Gloss and High-Impact ABS Classes

Material substitution within the ABS family requires attention to three variables: melt flow, impact resistance, and surface gloss. A general-purpose high-gloss ABS with the same melt flow may exhibit 60° gloss above 80 GU on smooth plaque surfaces, whereas low-gloss ABS of this class is typically specified below 45 GU under the same measurement geometry. A high-impact ABS may exceed 30 kJ/m² in Charpy notched impact at 23 °C, but often carries higher rubber content, lower flexural modulus, and higher visible surface gloss variation on textured surfaces. A high-flow ABS may reach 30 to 50 cm³/10 min MVR, but the trade-off is lower impact strength and less consistent texture replication. The following matrix compares the classes under identical test methods.

Before substituting a high-gloss or high-impact grade for ABS 800-LG, the moulder should replicate surface gloss measurements on the production-textured cavity, not on smooth plaques, because the ranking of materials on smooth plaques does not always match textured part behaviour. Shrinkage, mould temperature sensitivity, and weld-line visibility must also be revalidated on the intended tooling before material substitution is accepted.