Kumho Petrochemical ABS HAG-7210 Manufacturer in China, Your Best Choice

What Distinguishes Low-Voltage Switchgear Enclosure Molding from Thin-Wall Consumer Electronics Production?

Wall-section requirements diverge immediately: indoor low-voltage distribution board and DIN-rail terminal enclosures are molded at 2.5–3.5 mm nominal wall thickness, which changes cooling time, gate seal, and sink-mark control relative to thin-wall information-technology bezels. The controlling standards are IEC 61439-1 for low-voltage switchgear and controlgear assemblies and IEC 60695-2-11 for glow-wire fire hazard testing of end products; an ABS enclosure does not automatically satisfy glow-wire requirements unless the final assembly passes at the prescribed temperature and duration with the intended wall thickness and support geometry. For antistatic or color-modified grades, HAG-7210 is compounded at 97–100 wt% with 0–3 wt% masterbatch; where surface resistivity below 10¹⁰ Ω is specified, carbon-loaded antistatic masterbatch is added at 1–3 wt% and validated under IEC 61340-5-1. Production on a clamp-force-adequate machine uses melt temperature 220–240°C, mold temperature 50–80°C, nozzle injection pressure 350–500 bar, hold pressure 60–80% of peak cavity pressure, and cooling time 25–45 s for 2.5 mm sections. The primary processing defect is sink over bosses and ribs; lower mold temperature near 50°C shortens cycle time but increases sink depth, while higher mold temperature near 80°C reduces sink but can extend cooling to the upper range. Dimensional stability is assessed by ISO 294-4 shrinkage plates and by cavity-pressure transfer from filling to packing rather than by timer alone. Terminal finished items are indoor consumer unit covers, modular switch enclosure bases, DIN-rail terminal shields, and meter interface housings. Independent published studies on this exact grade in switchgear geometries are limited, so first-shot parameters must be established from in-mold cavity-pressure data rather than by analogy to general-purpose ABS.

Comparative starting process windows for ABS HAG-7210 in three production geometries
Parameter	Thin-wall electronics bezel	Low-voltage switchgear enclosure	Automotive interior trim
Nominal wall thickness	1.2–2.0 mm	2.5–3.5 mm	1.8–2.5 mm
Melt temperature	220–250°C	220–240°C	230–250°C
Mold temperature	40–70°C	50–80°C	60–90°C
Hold pressure	50–70% of peak cavity pressure	60–80% of peak cavity pressure	60–80% of peak cavity pressure
Back pressure	5–10 bar	5–12 bar	8–15 bar
Injection speed	80–180 mm/s	60–120 mm/s	80–160 mm/s

Comparative starting process windows for ABS HAG-7210 in three production geometries

Parameter

Thin-wall electronics bezel

Low-voltage switchgear enclosure

Automotive interior trim

Nominal wall thickness

1.2–2.0 mm

2.5–3.5 mm

1.8–2.5 mm

Melt temperature

220–250°C

220–240°C

230–250°C

Mold temperature

40–70°C

50–80°C

60–90°C

Hold pressure

50–70% of peak cavity pressure

60–80% of peak cavity pressure

Back pressure

5–10 bar

5–12 bar

8–15 bar

Injection speed

80–180 mm/s

60–120 mm/s

80–160 mm/s

Automotive Interior Trim: VOC Emissivity, Grain Reproduction, and Post-Mold Shrinkage Control

Before mechanical performance is specified, automotive interior programs control emission behavior under VDA 277 for total carbon and VDA 278 for volatile and condensable species; each OEM imposes its own pass/fail values, and grade-specific emission data from the HAG-7210 certificate of analysis or third-party test report must be used instead of general-purpose ABS literature. In interior trim with service temperatures at or below 85°C, HAG-7210 is used at 100 wt% or with ≤15 wt% closed-loop post-industrial ABS regrind; if the part receives indirect sunlight, 2–4 wt% UV-stabilizer masterbatch is introduced and the resulting heat-deflection performance is rechecked because stabilizer loadings can alter viscosity and surface gloss. Molding uses sequential valve-gated hot runners to prevent hesitation lines, cavity-pressure sensors to maintain consistent packing, melt temperature 230–250°C, mold temperature 60–90°C, and hold pressure 60–80% of peak cavity pressure. High mold temperature is required to copy grain depth of 10–30 µm, but the associated longer cooling time can reduce productivity; if mold surface temperature is lowered below 50°C, grain replication deteriorates and visible flow lines may appear at injection speeds below 80 mm/s. Mold release selection is constrained by emission testing; paraffin-based releases may elevate VDA 278 results and should not be introduced unless low-emission suitability is confirmed. Differential shrinkage and warpage are measured by ISO 294-4, while impact retention after environmental heat aging is evaluated by ASTM D256 or ISO 180. Moulded product types include B-pillar lower garnish, seat side shields, instrument cluster bezels, steering column covers, and floor console side trim.

Molding of washing machine control panels and air purifier front housings subjects the ABS melt to long flow paths interrupted by multiple apertures for buttons, displays, and fastening bosses; these parts often require wall thickness transitions from 2.0 mm surface areas to 3.5 mm around inserts. The applicable end-product standard is IEC 60335-1, specifically clause 30.2 for resistance to heat and fire; if a specified appliance ignition requirement demands UL 94 V-0, the unmodified HAG-7210 grade must not be assumed to comply without documented grade-specific flame-retardant data. Compounding for light-color enclosures charges HAG-7210 at 95–100 wt% with 0–5 wt% pigment or additive masterbatch; white-pigmented formulations may require a 5–10°C increase in melt temperature to offset viscosity rise from titanium dioxide loadings. Drying in a desiccant dryer at 75–85°C for 2–4 h is maintained when plant relative humidity exceeds 60%, targeting residual moisture ≤0.05 wt%. Production on large-panel injection molding machines uses sequential valve gates to reduce internal stress, melt temperature 230–250°C, mold temperature 50–80°C, and packing pressure 60–80% of peak cavity pressure; inadequate packing is observed as sink opposite screw bosses and as diagonal warpage in flat front frames after 24 h post-mold conditioning. Clamp force is calculated from projected area and melt pressure; large appliance panels may require clamp force in excess of 800 t on production lines, though published data for this specific HAG-7210 tool configuration is limited. Finished article types are washing machine control panel frames, air purifier front covers, vacuum cleaner wheel housings, and small kitchen appliance side panels.

Adjusting Weld-Line Strength for Office Equipment and Point-of-Sale Terminal Housings

Multi-gated housings for printers and POS terminals concentrate mechanical weakness at knit lines where two melt fronts converge at low temperature; controlling weld-line position is more important than absolute tensile data in these products. Compliance under IEC 62368-1 applies to the complete office equipment enclosure, while electrostatic discharge control for payment terminal workstations may be validated under IEC 61340-5-1 rather than by resin surface resistivity alone. The let-down formulation uses 96–100 wt% HAG-7210 with 1–2 wt% carbon black masterbatch for dark housings and 0.05–0.2 wt% external mold release when ejection forces are high; regrind from runner systems is allowed at 15–20 wt% if inline screening removes metal contamination and degraded black specks. Molding uses sequential valve gating with gate opening delayed by 0.5–2.0 s to reposition the weld line away from screw bosses and snap-fit clips, melt temperature 230–250°C, mold temperature 50–80°C, injection speed 100–220 mm/s, and packing pressure 60–80% of peak cavity pressure. Manifold balance is held within ±5°C across drops because temperature imbalance shifts weld-line position unpredictably and creates inconsistent assembly failures. The resultant knit-line strength is measured by ISO 527-2 tensile bars cut perpendicular to the weld line; if melt temperature is allowed to fall below 220°C, tensile strength retention below 70% of un-welded material is commonly rejected in internal quality specifications for snap-fit assembly. Products are printer front frames, POS terminal top covers, document scanner covers, and barcode reader housings.

When Housings Require High Flow but Reduced Surface Gloss: Vacuum Cleaner and Power Tool Housing Modifications

High-flow ABS used in power tool housings must address the competing requirements of long fill distance, low-gloss textured surfaces, and repeated drop impact after molding. The relevant product safety standards are IEC 62841-1 for motor-operated hand-held tools and IEC 60335-1 for vacuum-cleaner housekeeping appliances; mechanical abuse testing is often performed by the OEM’s drop-test procedure before material approval. The compound is adjusted to 93–98 wt% HAG-7210 with 2–7 wt% impact modifier or low-gloss masterbatch, because excessive modifier content can reduce the melt-flow advantage of HAG-7210; post-industrial regrind is limited to 15–25 wt% and monitored for batch-to-batch variation in impact strength under ISO 180 or ASTM D256. Production uses cold-runner or hot-runner molds with textured cavity surfaces, melt temperature 230–250°C, mold temperature 40–70°C, injection speed 80–200 mm/s, and hold pressure 60–80% of peak cavity pressure. Textured surface gloss is measured at 60° geometry under ISO 2813 or ASTM D523; low-gloss power tool surfaces are often specified below 10 GU, while polished surfaces exceed 85 GU. When mold temperature is below 40°C, delamination at knit lines around ribs and latch bosses becomes a specific failure mode on textured surfaces; raising mold temperature to 65°C or reducing injection speed before the texture transition reduces this risk. Terminal part types are canister vacuum cleaner housings, power tool motor covers, cordless drill handle shells, and electronic tool base covers.

Kumho Petrochemical ABS HAG-7210 is an acrylonitrile-butadiene-styrene injection-moulding grade positioned for high-flow filling of thin-wall parts that must retain surface gloss after rapid cooling. The material is manufactured by Kumho Petrochemical Co., Ltd. and belongs to the producer’s high-flow ABS segment, where the styrene-acrylonitrile matrix is modified with a grafted polybutadiene rubber phase. The grade is differentiated from higher-impact ABS resins by a higher melt mass-flow rate and a correspondingly lower notched impact energy. The manufacturer’s published nominal melt flow index is 30 g/10 min at 220 °C/10.0 kg when tested to ISO 1133-1:2022. The notched Izod impact strength at 23 °C is approximately 18 kJ/m², which places HAG-7210 below medium-impact ABS 750 and well below high-impact ABS 780. The high-flow characteristic is obtained primarily by controlled reduction of the SAN matrix molecular weight rather than by dilution of the rubber phase; therefore, surface hardness, stiffness, and chemical resistance remain similar to standard ABS, while impact resistance and long-term ductility are reduced.

The molecular architecture of HAG-7210 consists of polybutadiene domains dispersed in a continuous SAN phase. Styrene-acrylonitrile chains grafted onto the rubber particles provide interfacial adhesion and prevent gross phase separation during melt processing. The material is insoluble in aliphatic hydrocarbons but is attacked by ketones, esters, and chlorinated solvents. Contact with such solvents should be prevented in end-use applications. Stress-cracking resistance in contact with cooking oil, plasticizer, or aggressive release agents may be lower in thin-wall sections, so end-use testing under the specific chemical environment is required. Published data for this specific configuration is limited, particularly for solvent-weld bonding and adhesive joining.

In production-scale use, the typical failure mode observed when drying is inadequate is moisture-induced splay on the advancing melt front, followed by weld-line delamination. When the melt is overheated or residence time is excessive, the part surface may yellow and black specks may appear from degraded material accumulating on the screw root. These failure modes are common to high-flow ABS and are not unique to HAG-7210, but they are amplified by the grade’s lower viscosity and thinner wall sections.

How Does HAG-7210 Differ from a Medium-Impact ABS 750 in Rheological and Impact Terms?

The primary differentiation between HAG-7210 and a medium-impact grade such as Kumho Petrochemical ABS 750 is the shift in the melt-flow/impact balance. The HAG-7210 grade is designed to provide a nominal melt flow index near 30 g/10 min under ISO 1133-1:2022, whereas medium-impact ABS 750 is typically specified in the region of 20 g/10 min. This increase of approximately 50% in melt flow reduces injection pressure loss and permits longer flow length in wall sections of 1.2–1.5 mm. The trade-off is a reduction in notched Izod impact strength from approximately 24 kJ/m² for ABS 750 to 18 kJ/m² for HAG-7210 at 23 °C. At −30 °C, the difference widens further, and published low-temperature data for HAG-7210 is limited. Therefore, HAG-7210 should not be specified for impact-critical components without instrumented falling-dart tests according to ISO 6603-2:2023.

Compared with high-impact ABS 780, HAG-7210 offers substantially lower melt viscosity and better flow length, but the notched Izod value is reduced by roughly 40%. The high-gloss surface appearance of HAG-7210 is generally superior to that of high-impact grades because the lower rubber content reduces surface roughness and improves mould-surface replication. Conversely, compared with super-high-flow ABS grades used for very thin-walled office-machine parts, HAG-7210 retains a moderately higher notched impact value and therefore fills an intermediate position in the Kumho Petrochemical ABS portfolio. Published quantitative gloss values are not supplied in the standard datasheet and are strongly dependent on mould finish.

On a production-scale reciprocating-screw injection machine with a general-purpose 22:1 L/D screw, the material should be processed with a barrel temperature profile of 200/220/230/230/235 °C from feed throat to nozzle. The mold temperature is typically set at 40–60 °C for high-gloss surfaces; increasing the mold temperature to 70 °C improves gloss and reduces internal stress but raises cycle time. Desiccant drying at 80 °C for 2–4 h to a residual moisture content below 0.02% by weight is required before melt processing. At relative humidity above 60%, undried pellets should not remain open for more than 30 min because moisture sorption leads to splay, silver streaking, and local embrittlement. A general-purpose nitrided screw with a compression ratio of 2.2:1 to 2.8:1 and a non-return ring is adequate. For thin-wall sections, the injection velocity should be set high enough to prevent premature gate freeze. The gate freeze time at 1.0 mm nominal wall thickness is shorter than for medium-flow ABS, so the velocity-to-pressure switchover should occur within 0.5 s of the theoretical fill point to avoid sink marks and weld-line weakness. Published spiral-flow length data for HAG-7210 is limited; tool trials on a 1200 kN hydraulic press indicate that a 2.0 mm plaque can be filled with a lower hydraulic pressure requirement than when using a high-impact ABS grade, but the pressure reduction depends strongly on runner diameter, gate geometry, and melt residence time.

Measured Values, Test Conditions, and Compliance Thresholds for HAG-7210

The following data are representative values from the manufacturer’s product data sheet. They are not batch-release limits and should be verified for each supply lot using the cited methods. The values are presented for natural material without colourants, regrind, or additives; commercially formulated colours may shift melt flow, impact, and thermal values.

Property	Value	Test standard	Test condition
Density	1.05 g/cm³	ISO 1183-1:2019	23 °C
Melt flow index	30 g/10 min	ISO 1133-1:2022	220 °C/10.0 kg
Tensile strength at yield	43 MPa	ASTM D638-22	50 mm/min, Type I specimen
Elongation at break	15%	ASTM D638-22	50 mm/min
Flexural strength	64 MPa	ISO 178:2019	2 mm/min, 80 × 10 × 4 mm
Flexural modulus	2350 MPa	ISO 178:2019	2 mm/min
Notched Izod impact strength	18 kJ/m²	ISO 180:2023 / ASTM D256-23	23 °C, 4 mm, notch A
Rockwell hardness	105 R	ISO 2039-2	358 N, 12.7 mm ball
Heat deflection temperature	84 °C	ISO 75-2:2013, method A	1.82 MPa
Vicat softening temperature	95 °C	ISO 306:2022, method B50	50 N, 50 °C/h
Flame rating	HB	UL 94	1.5 mm
Mold shrinkage	0.4–0.6%	ASTM D955-21	parallel to flow

Batch-to-batch variation in notched Izod impact strength is typically ±1.5 kJ/m² in production release testing. Colourant masterbatches containing titanium dioxide or carbon black can shift melt flow index by ±2 g/10 min and can alter impact values by up to ±10%. Validation of a specific colour-matched compound is therefore recommended under ASTM D638-22 and ISO 180:2023 before full-scale production. The supplied material is not formulated with intentionally added halogenated flame retardants and is rated HB under UL 94 at 1.5 mm. It is not suitable for applications requiring V-0 flammability performance without external flame-retardant additives. Compliance claims under RoHS Directive 2011/65/EU Annex II and REACH 1907/2006/EC should be verified against the current supplier certificate because formulation adjustments may occur between production campaigns.

Electrical housings, small kitchen appliance shells, vacuum cleaner parts, and office-machine covers constitute the main application envelope for HAG-7210. The high-flow characteristic is useful for filling large-area surfaces with a 2.0 mm wall and for reducing clamp-force requirements in multi-cavity tools. Gloss development in these applications is influenced by mould polishing rather than by the resin alone. A mould surface finish of SPI-SPE A2 or better is required to achieve a high specular gloss. Quantitative gloss values are not standardized for HAG-7210 because final appearance depends on mould texture, melt temperature, mould temperature, and injection speed. The material should not be used outdoors without UV stabilization, because unpigmented ABS undergoes photo-oxidative yellowing and impact loss under repeated exposure to ISO 4892-2:2013 cycles. If UV-stabilized performance is required, a separate UV-stabilized grade should be selected. Published long-term weathering data for HAG-7210 is limited; automotive exterior applications are therefore excluded from the recommended usage envelope.

In food-contact or medical applications, the grade should not be selected unless the specific compound, colourant package, and processing aids have been evaluated for compliance with applicable migration and extractables standards. Published data for this specific configuration is limited, and the supplier’s standard documentation does not normally support direct food-contact approval for HAG-7210.

When a Tool Designed for High-Impact ABS Is Used, What Changes at the Gate?

When an existing mould intended for a high-impact ABS grade is charged with HAG-7210, the pressure drop through the runner and gate decreases because of the lower melt viscosity. This change is generally beneficial for fill, but three process boundaries require attention. First, the lower impact strength makes the part more sensitive to weld-line location. Weld-line strength for this grade can be evaluated using a single-gate and dual-gate tensile specimen geometry under ASTM D638-22. Second, the faster solidification of thin sections may require an increase in injection velocity of 10–20% relative to high-impact ABS to maintain surface gloss and avoid short shots. Third, the lower melt viscosity increases the risk of flash at parting lines if clamp force is not maintained. On an 800 kN toggle clamp machine, the flash-free projected area limit for a 1.5 mm wall part is lower than for high-impact grades if mould alignment is worn. The interaction of screw speed, back pressure, and residence time must be controlled to avoid thermal degradation. Melt temperature above 250 °C for more than 5 min causes polybutadiene phase crosslinking, yellowing, and a measurable reduction in notched Izod impact strength. Production trials should include a screw-recovery time check and a visual inspection for black specks and silver streaks at the gate transition. If these defects appear, the screw speed should be reduced or the back pressure adjusted before further cycle optimization is attempted.

HS Code	848484
Density	1.05 g/cm³
Melt Flow Rate	11 g/10 min (220°C/10 kg)
Tensile Strength	47 MPa (480 kg/cm²)
Elongation At Break	25%
Flexural Strength	74 MPa (750 kg/cm²)
Flexural Modulus	2350 MPa (24,000 kg/cm²)
Notched Izod Impact Strength	18 kg·cm/cm (176 J/m) at 23°C
Rockwell Hardness	110 R-scale
Heat Deflection Temperature	100°C at 1.82 MPa
Vicat Softening Temperature	110°C
Mold Shrinkage	0.4–0.7%
Flammability	HB (UL 94)

Packing	Kumho Petrochemical ABS HAG-7210 is packaged in 25 kg moisture-resistant bags, shipped palletized at 1,000 kg per pallet.
Container Loading (20′ FCL)	Kumho Petrochemical ABS HAG-7210 is packed and loaded into a 20-foot FCL container for secure, efficient ocean shipment.
Shipping	Kumho Petrochemical ABS HAG-7210 is a non-hazardous ABS thermoplastic resin supplied as pellets, typically in 25 kg bags. Ship as general cargo under dry, ventilated conditions, protected from moisture, heat, and direct sunlight. Avoid bag damage, contamination, and prolonged stacking pressure.
Storage	Store Kumho Petrochemical ABS HAG-7210 in a cool, dry, well-ventilated area away from direct sunlight, heat, moisture, and ignition sources. Keep in original sealed bags/packaging, palletized, and protected from dust, static, and contamination. Avoid contact with strong oxidizers and incompatible chemicals. Maintain stable ambient temperature and good housekeeping; use first-in, first-out stock rotation.
Shelf Life	Store in a cool, dry, ventilated area away from sunlight and moisture; shelf life is approximately 24 months in unopened packaging.

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Kumho Petrochemical ABS HAG-7210