Dongguan Haiyue ABS HY700-HG is identified in the supplier’s nomenclature as an acrylonitrile-butadiene-styrene copolymer grade, with the HG suffix conventionally denoting a high-gloss surface response after injection moulding. The product is positioned for rigid thermoplastic applications in which specular surface appearance, dimensional stability, and moderate impact resistance are required on conventional screw injection moulding lines. Because a fully public supplier datasheet is not available at the time of writing, the specification framework below cross-references ISO 19062-1 and ISO 2580-1 classification terminology rather than assigning proprietary melt flow or impact coefficients to the product. Purchase specifications should require a batch-specific certificate of analysis before release for production. The polymer class consists of a continuous styrene-acrylonitrile matrix, a dispersed grafted polybutadiene rubber phase, and low-molecular-weight processing aids; the high-gloss variant is generally associated with reduced gel particles and controlled rubber particle size to limit surface haze under ISO 2813 and ASTM D523 measurement conditions.

When Does a High-Gloss ABS Grade Diverge from Standard ABS?

In comparative evaluations, the departure from general-purpose ABS becomes visible first in 60° specular gloss and in visual haze under unidirectional illumination. High-gloss ABS grades are formulated to shift the rubber-phase particle-size distribution toward smaller domains and to reduce cross-linked gel population, which lowers micro-roughness on the frozen surface layer. The effect is measured as an increase in specular gloss at 60° under ISO 2813, typically exceeding 90 GU on highly polished tools, whereas standard ABS often falls below 80 GU under the same cavity finish. The trade-off is usually a change in impact response: notched Izod values measured under ISO 180/A may remain within the broad 15 kJ/m² to 30 kJ/m² range, but the orientation of shear-induced rubber deformation can shift failure from hinge to brittle depending on gate type and wall thickness. High-gloss grades also tend to exhibit lower melt viscosity for the same impact rating, because the reduced rubber particle size contributes less melt elasticity; capillary rheometry under ISO 11443 typically shows a stronger shear-thinning slope than a general-purpose ABS with the same Vicat softening temperature. The comparison is not absolute: colour concentrates, regrind content, and mould release residue can all suppress gloss before polymer morphology becomes the limiting variable.

Table 1 provides the standard characterization matrix used to detect divergence from standard ABS. The ranges are typical literature values for high-gloss ABS, not batch-specific release data for HY700-HG.

At relative humidity above 60%, pre-drying of ABS HY700-HG is required before melt processing because moisture above 0.05% by mass, determined by ISO 15512, leads to splay, silver streaking, and loss of gloss on the flow front. Drying in a desiccant forced-air hopper at 80 °C to 90 °C for 2 h to 4 h is a standard starting condition for high-gloss ABS, but the exact dew point should be maintained below −30 °C at the hopper inlet. On single-screw reciprocating machines with a 20:1 to 25:1 L/D screw and a compression ratio of 2.2:1 to 2.8:1, melt temperatures between 220 °C and 250 °C are typical. Mold temperatures of 40 °C to 80 °C are used; polished cavity surfaces at the upper end of that range improve contact replication but extend cycle time. Production-scale trials on ABS high-gloss grades show that gate blush and jetting are more visible than on textured or low-gloss grades, so lower injection velocity and higher melt temperature at the gate often reduce flow-front fracture. The use of a hot runner with external heating is preferred over cold runner systems; if a cold runner is unavoidable, the sprue and runner should be polished and generously sized to avoid pressure-loss-induced surface striations. Regrind levels above 20% in the feedstock can introduce additional volatile residues and colour shift, and should be validated by MVR retention and gloss consistency on a production tool.

Rheological Constraints in Thin-Wall Injection Moulding

In thin-wall sections below 2.0 mm, the ability of HY700-HG to replicate a polished cavity is limited by fountain-flow cooling and by the pressure drop across the gate. Capillary rheometry under ISO 11443 at 230 °C and apparent shear rates from 100 1/s to 5,000 1/s provides the viscosity curve that should be imported into injection moulding simulation; without that curve, a trial with an unfilled high-gloss ABS should still be started with a fill time near 0.5 s to 1.5 s for cold-runner plaques, adjusted to maintain a uniform velocity-to-position switch. At high shear rates, high-gloss ABS exhibits a steep reduction in shear stress; however, if the melt enters the cavity too quickly, the frozen surface layer fractures and creates a visible flow mark that cannot be removed by polishing. Cavity pressure transducers mounted in the end of fill should record 60 MPa to 90 MPa at pack; lower values may indicate premature freeze-off, while higher values can cause flash and ejection distortion. Published batch-specific rheological data for Dongguan Haiyue ABS HY700-HG is limited; therefore, the preceding values are typical processing brackets for high-gloss ABS and should be confirmed by in-plant capability studies on the actual mould.

For moulds with long flow paths from the sprue to the last-filling feature, the pressure drop across the runner can exceed the cavity pressure available for gloss generation. A 25 mm diameter reciprocating screw with a 20:1 L/D ratio and a melt cushion of 3 mm to 5 mm is a practical reference for stable shot-to-shot density. Back pressure of 5 bar to 10 bar and screw surface speed below 0.3 m/s reduce unmelted material and air entrapment that appear as splay on high-gloss surfaces. However, actual settings depend on screw wear profile, non-return valve condition, and the presence of masterbatch colourants.

For appliance housings, cosmetic packaging, and interior trim components, the high-gloss grade is evaluated against scratch resistance, chemical resistance to skin oils and cleaning agents, and dimensional stability after multiple thermal cycles. ABS HY700-HG is not inherently weather-stable; ultraviolet exposure without protective capstock or pigmentation leads to yellowing and loss of gloss, so outdoor applications require validation under ISO 4892-2 or ISO 4892-3. The grade is incompatible with ketones, esters, and chlorinated solvents; these fluids cause crazing and stress-cracking in polybutadiene-modified styrenics. Compared with ABS/PC blends, an unfilled high-gloss ABS such as HY700-HG generally offers lower heat deflection temperature under ISO 75-2/B, typically 90 °C to 100 °C for ABS versus 100 °C to 125 °C for many ABS/PC grades, and lower multi-axial puncture energy under ISO 6603-2, but it provides easier flow and a higher specular gloss at the same mould polish. In environments requiring repeated contact with isopropanol or ethanol, chemical resistance should be tested under ISO 22088-3 at a defined strain; published product-specific data for HY700-HG is limited. The material is not an electroplating grade unless qualified by etch adhesion trials; high-gloss morphologies may exhibit lower chromic acid etch microporosity than dedicated plating ABS grades because the rubber particle distribution is tuned for surface gloss rather than etch uniformity.

If a High-Gloss Surface Finish Must Survive Demoulding Without Secondary Coating

If the moulded article must retain high gloss directly after demoulding, tool steel selection and ejection design become part of the material specification. High-gloss ABS lines show flow marks more strongly than low-gloss grades, so the mould parting line should be relocated away from visible surfaces and venting depth kept below 0.03 mm on ABS to avoid flash. Draft angles of at least 1° per side on polished cores and 2° on textured surfaces reduce ejection drag; ejector pins should be located on hidden ribs or bosses. External or internal mould release agents must be avoided unless their dosage is below the threshold that causes haze; silicone-based release agents can reduce gloss under ISO 2813 even when no surface residue is visible. For high-gloss ABS, a mirror-polish cavity surface of SPI A1 to A2 is commonly specified; measured gloss on the moulded part is then influenced more by material gel content and screw plasticating history than by cavity polish alone.

Batch-to-batch variation in melt viscosity and rubber particle size can produce gloss drop of several GU on identical moulds; incoming QC should track MVR under ISO 1133-1 and notched Izod under ISO 180/A as release criteria before the material enters the drying hopper. In addition, mould temperature stability must be maintained within ±3 °C across the cavity because high-gloss ABS surfaces are sensitive to cooling rate differences; warmer regions develop higher gloss and lower residual stress, while colder regions can appear dull or hazy. This condition represents a process boundary, not a material defect, but it is frequently misdiagnosed as batch inconsistency.

Specifying the Supplier Datasheet for an ABS HG Grade

When a product-specific datasheet is not publicly available, the supplier should be asked to report the following against the current method revisions: melt volume flow rate under ISO 1133-1, density under ISO 1183-1, tensile yield stress and elongation at yield under ISO 527-2, flexural modulus under ISO 178, notched Izod impact strength under ISO 180/A, Vicat softening temperature under ISO 306/B50, heat deflection temperature under ISO 75-2/B, and moulding shrinkage under ISO 294-4. For high-gloss grades, the additional surface specification should include specular gloss at 60° under ISO 2813 and a visual gel count on a standard plaque. The absence of these data prevents reliable comparison between HY700-HG and other ABS grades such as general-purpose, high-impact, plating, or flame-retardant ABS. In particular, a flame-retardant grade may report UL 94 V-0 at a specified thickness, while an unfilled high-gloss grade may only carry the UL 94 HB classification; electrical applications require a separate UL Yellow Card evaluation. The selected test method must be recorded in the certificate of analysis; changing the ISO 180 notch type from A to B or the Vicat heating rate from 50 °C/h to 120 °C/h changes the result substantially.