Dongguan Anshuyi ABS 346A-709 Nature
- Product Name: Dongguan Anshuyi ABS 346A-709 Nature
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Dongguan Anshuyi ABS 346A-709 Nature is typically used in formulations when melt flow rate, impact strength, and heat deflection temperature and melt temperature, mold temperature, and drying moisture content must be controlled within specific ranges.
| HS Code | 868163 |
| Polymer Type | Acrylonitrile Butadiene Styrene (ABS) |
| Color | Natural |
| Density | 1.04–1.06 g/cm³ |
| Melt Flow Rate | 10–20 g/10 min |
| Tensile Strength | 40–45 MPa |
| Flexural Modulus | 2100–2300 MPa |
| Notched Izod Impact Strength | 20–25 kJ/m² at 23°C |
| Heat Deflection Temperature | 80–90°C at 1.8 MPa |
| Vicat Softening Temperature | 95–100°C |
| Rockwell Hardness | 100–110 R-scale |
| Molding Shrinkage | 0.4–0.6% |
| Ul Flammability Rating | HB |
| Processing Method | Injection Molding |
| Drying Temperature | 80–90°C |
| Drying Time | 2–4 hours |
As an accredited Dongguan Anshuyi ABS 346A-709 Nature factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Dongguan Anshuyi ABS 346A-709 Nature is typically supplied in sealed 25 kg bags, palletized and shrink-wrapped for secure industrial bulk shipment. |
| Container Loading (20′ FCL) | Dongguan Anshuyi ABS 346A-709 Nature is securely packed and loaded into a 20-foot FCL container for export shipment. |
| Shipping | Dongguan Anshuyi ABS 346A-709 Nature is shipped as non-hazardous ABS resin pellets in sealed, moisture-proof bags or containers. Handle with care, keep dry, avoid direct sunlight, heat, and contamination. No special hazardous transport requirements are expected; maintain moderate temperatures and secure packaging to prevent spillage during transit. |
| Storage | Store Dongguan Anshuyi ABS 346A-709 Nature in a cool, dry, well-ventilated warehouse, away from direct sunlight, heat, flames, moisture, and oxidizing agents. Keep original containers closed and palletized; prevent dust generation and static buildup. Avoid incompatible chemicals, observe local fire and environmental regulations, and maintain good housekeeping with stock rotation. Use appropriate PPE when handling; ensure adequate ventilation and avoid prolonged skin contact. |
| Shelf Life | Store in a cool, dry, well-ventilated area; typical shelf life is 24 months from manufacture in unopened packaging. |
Before thin-wall electronics enclosure moulding begins, moisture control precedes all other processing decisions with ABS 346A-709 Nature. The granulate is dried in a desiccant-bed or rotary dehumidifying dryer with inlet air dew point at or below -35 °C, using a material temperature of 80 °C for 3–4 h when ambient relative humidity exceeds 60 %. Residual moisture above 0.05 % by ISO 15512 Karl Fischer titration generates hydrolysis-induced splay on gate surfaces and reduces notched Charpy impact after moulding. Mould surface temperature is maintained between 60 °C and 80 °C to allow weld lines to heal; lower mould temperatures reduce cycle time but increase orientation and produce differential shrinkage along the flow path. Shrinkage measured in accordance with ISO 294-4 falls between 0.4 % and 0.7 % for unfilled ABS, with variation across a 1.0 mm wall enclosure causing corner lift greater than 0.15 mm when part dimensions exceed 300 mm in flow length. To suppress this warpage, hold pressure is staged from 70 MPa to 100 MPa until the gate freezes, and cooling time is set to achieve average part ejection temperatures below 85 °C. On production-scale hydraulic machines with clamp force between 1,200 kN and 4,000 kN, screw back pressure of 0.5–1.0 MPa maintains melt temperature homogeneity without adding excessive shear heat. No flame-retardant rating should be inferred for this natural grade unless the batch certificate explicitly states a UL 94 V-2 or V-0 classification; general-purpose unfilled ABS typically obtains only a UL 94 HB rating when tested at 1.5 mm thickness under IEC 60695-11-10.
What Limits Flow Length When Thin-Wall Automotive Trim Tools Exceed 1.0 mm Nominal Wall?
The limiting factor is not barrel temperature but melt front solidification in sections thinner than 1.0 mm. Unfilled ABS of this viscosity class is typically processed at melt temperatures of 230 °C to 250 °C measured at the nozzle under ISO 294-1:2017 conditions. When wall thickness falls below 1.0 mm, the flow length-to-thickness ratio exceeds 150:1 and the melt front temperature drops below the ideal filling window before the cavity is packed. Injection speed is raised to 80–120 mm/s ram velocity, but high shear causes a temperature rise of 20–40 °C in the gate land, which lowers viscosity and can trigger gate blush. To compensate, the mould temperature is set at 70–80 °C for dashboard trim carriers, but ejection becomes problematic when sink marks or distortion exceed tolerance. Published data on exact spiral flow lengths for this specific natural grade is limited; tool trials on a 500 mm flow-length instrumented mould are required before hard tooling freeze. In instrument panel bezel production, textured surfaces mask flow hesitation lines, but gloss black or painted surfaces require uniform mould temperature within ±3 °C across the cavity because ABS molecular orientation visible through clear coatings intensifies at temperature gradients above 5 °C. Dimensional stability after conditioning follows ISO 291:2008 at 23 °C and 50 % RH; post-moulding shrinkage of 0.05 % over 24 h must be added to tool allowance when automotive tolerances are ±0.1 mm.
| Parameter | High-gloss automotive trim regime | General enclosure regime |
|---|---|---|
| Melt temperature at nozzle | 230–250 °C | 220–245 °C |
| Mould surface temperature | 70–80 °C | 40–60 °C |
| Injection ram velocity | 80–120 mm/s | 50–90 mm/s |
| Hold pressure | 80–110 MPa | 60–90 MPa |
| Screw back pressure | 0.5–1.0 MPa | 0.3–0.8 MPa |
| Cooling time to ejection | 25–45 s | 18–35 s |
Chromic Acid Etch Chemistry and Peel Strength Thresholds
When electroplated ABS components are produced from natural-grade ABS, selective oxidation of the butadiene phase creates micro-cavities for mechanical anchoring. The etch bath for standard ABS employs chromium trioxide at 350–450 g/L and sulfuric acid at 250–400 g/L, maintained at 60–70 °C. Immersion times of 6–15 min are typical; longer exposure collapses the etch structure and reduces peel strength below the industrial acceptance threshold of 0.35 N/mm in accordance with ASTM B533-85. After neutralisation and activation with palladium-tin colloid, the part enters electroless nickel or copper deposition with a thickness of 0.25–0.5 µm before electrolytic copper builds to 15–25 µm. The adhesion of the plated layer depends not only on etch depth but on moulding stress frozen into the surface: parts moulded with high injection velocities above 120 mm/s and low mould temperatures below 40 °C exhibit high surface orientation that etches unevenly, producing localised blistering after thermal cycling from -30 °C to 80 °C. Rack plating requires current density of 2–5 A/dm² for initial copper strike; edge effects and air entrapment in deep ribs must be managed with auxiliary anodes. Published data for this specific Dongguan Anshuyi grade after electroplating is limited; pre-production plating trials on moulded plaques are required to establish adhesion stability, because rubber particle size and grafting ratio in the ABS base resin control etch pit distribution.
In refrigerator door liners and interior trim, low-temperature impact is controlled more by rubber-phase morphology than by melt processing. ABS 346A-709 Nature, when evaluated for appliance interior parts, faces competing demands: the material must resist stress cracking from ester-based blowing agents and repeated door impacts at -20 °C. For unfilled ABS, notched Charpy impact measured at -30 °C according to ISO 179-1/1eA is commonly 6–12 kJ/m² depending on butadiene content, while room-temperature values reach 15–35 kJ/m². This drop indicates that designers must avoid sharp radius transitions below 0.8 mm in door bin ribs. In production, the melt temperature is set at 220–240 °C; excessive melt residence time above 250 °C for more than 5 min degrades the butadiene phase and lowers notched impact by 20–40 %. Purging with a high-viscosity acrylic or ABS purge compound after colour change prevents cross-contamination. Parts must pass thermocycling tests from -30 °C to 65 °C in 200 cycles without visible cracks; however, published data for this specific natural grade in refrigerator liner applications is limited, so trial mouldings are required before production release.
When Natural ABS Is Used in Unpainted Appliance Housings, Screw Configuration Dictates Colour Stability
Because unpainted appliance housings reveal yellowing caused by thermal oxidation and shear-induced material degradation, screw configuration becomes the primary control variable. In single-screw machines with screw diameter 60–80 mm and L/D ratio 25:1, barrel temperature profiles are set from 210 °C in the feed section to 240 °C at the metering section, with nozzle temperature capped at 245 °C. The screw should contain a dispersion section, such as a Maddock mixer, but high shear in this section can raise melt temperature by 10–20 °C; residence time is limited to 3–4 min at maximum screw speed. In injection moulding machines with accumulator-assisted high-speed injection, shear rates at the gate reach 10,000–50,000 s⁻¹, enough to lower molecular weight and produce yellow streaks if the gate diameter is below 1.0 mm. To avoid visible discolouration, gate diameter is sized for a shear rate below 30,000 s⁻¹ using melt viscosity data measured at 100–1,000 s⁻¹ on a capillary rheometer under ISO 11443:2014. The natural grade does not contain titanium dioxide or optical brighteners; therefore the final colour is established by masterbatch dosing at 2–4 wt%, with predrying of the masterbatch at 80 °C for 4 h. If flame resistance is required, the housing specification must call a pre-compounded flame-retardant ABS because dry-blending FR additives with natural ABS at the press usually reduces notched Charpy impact by 30–50 % and impairs surface gloss.
Vacuum Metallizing Demands Volatile Control Below 0.05 % Moisture
After demoulding, metal-coated front panels require ABS surfaces free of volatile residues and mould release agents. Parts are washed in an aqueous alkaline cleaner at 50–60 °C to remove external release, then dried in a vacuum oven below 0.1 kPa for 2–3 h. Residual moisture above 0.05 % outgasses during base coat curing at 70–80 °C and creates pinholes in the evaporated aluminium layer. In the metallizing chamber, pressure is reduced to 1×10⁻³ Pa or lower before tungsten filaments evaporate aluminium wire of 99.99 % purity; the aluminium thickness is typically 80–120 nm. Adhesion is evaluated by cross-cut tape testing according to ISO 2409:2013, requiring classification of 0 or 1 for cosmetic front panels. The base coat must withstand the thermal expansion difference between aluminium and ABS, especially when parts undergo 20 cycles of thermal shock from -20 °C to 60 °C. Outgassed hydrocarbons during pumpdown indicate incomplete cleaning or excessive processing temperatures; a total ion current monitor should show stable base pressure below 5×10⁻⁴ Pa. Because natural ABS grades generally do not contain internal mould release agents, volatile contamination is usually controllable, but published data for vacuum metallizing this exact grade is limited; first-article qualification is mandatory.
Regulatory status for ABS 346A-709 Nature under food-contact and medical-device frameworks must be established from the supplier’s documentation. General-purpose ABS is not automatically compliant with EU 10/2011 for food contact, and USP Class VI or ISO 10993 biological evaluation is outside the scope of a natural injection-moulding grade unless explicitly stated on the certificate of analysis. If the part is intended for a medical enclosure with incidental skin contact, the moulder has to request documentation covering REACH 1907/2006 Article 33 SVHC disclosure and the absence of phthalates regulated under EU 2011/65/EU Annex II. For electrical safety, the grade’s comparative tracking index and glow-wire performance under IEC 60695-2-12 must be evaluated on the final wall thickness, not on the raw granulate certificate. Published data for this specific natural grade in medical device enclosures is limited; downstream testing under ISO 10993-5 and ISO 10993-10 is required before commercialization. Cleanroom moulding, if required, should use oil-free demoulding, as silicone-based external release agents create surface energy changes that interfere with subsequent solvent bonding or coating.
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- Dongguan Anshuyi ABS 346A-709 Nature is manufactured under an ISO 9001 quality system and complies with relevant regulatory requirements.
- COA, SDS/MSDS, and related certificates are available upon request. For certificate requests or inquiries, contact: sales8@ascent-chem.com.
Designated Dongguan Anshuyi ABS 346A-709 Nature, the material is an unpigmented, unfilled acrylonitrile-butadiene-styrene terpolymer supplied in natural pellet form. The “Nature” suffix identifies a pigment-free formulation; it does not denote a flame-retardant, electroplating, or UV-stabilised grade. This distinction permits downstream colouring with pelletized masterbatch or liquid colourant, but it also means the resin reaches the moulder without the opacifying or UV-shielding effect of carbon black, titanium dioxide, or organic pigments. Compositionally, ABS 346A-709 Nature belongs to the two-phase terpolymer class in which polybutadiene rubber particles are grafted with styrene-acrylonitrile copolymer and dispersed within a continuous SAN matrix. Acrylonitrile content in general-purpose ABS typically lies between 15 wt% and 35 wt%, butadiene between 10 wt% and 25 wt%, and styrene forms the balance. These proportions govern solvent resistance, hardness, melt flow, and low-speed ductility. The polymerisation route can influence residual monomers, rubber particle size distribution, and base colour; natural pellets may therefore exhibit a slight ivory-to-translucent appearance. The grade is intended for injection moulding and is compatible with standard cold-runner and hot-runner tooling; published batch-specific data for this specific designation should be obtained from the supplier before tool construction or process release.
What Drying, Melt, and Mould-Temperature Boundaries Apply to ABS 346A-709 Nature?
ABS is hygroscopic, and the natural unfilled grade is not exempt from moisture pickup. At ambient relative humidity above 60%, pellet surface moisture can rise to levels that generate silver streaking, splay, and loss of surface gloss during injection. Drying is therefore mandatory prior to processing. A desiccant dryer with a dew point of −20°C to −40°C and supply air at 80–90°C for 2–4 h is representative for this flow class. Residual moisture should be verified below 0.05% by Karl Fischer titration or an equivalent loss-on-drying method. Hopper residence time should not exceed 4 h unless the dryer is sized for full throughput. The narrow processing window arises from the butadiene phase, which is sensitive to prolonged thermal exposure. Melt temperature is typically set between 200°C and 240°C, with nozzle temperature controlled at 210–230°C and a nozzle temperature stability of ±5°C. Mould surface temperature should be held between 40°C and 80°C; the upper end improves knit-line strength and flow length but extends cooling time. Injection velocity is moderate to high, holding pressure is commonly 30–70 MPa, and screw back pressure is maintained at 0.5–2 MPa. Barrel residence time should be limited; extended residence above 250°C can yellow the natural resin, reduce impact through rubber-phase crosslinking or chain scission, and release degradation volatiles. Screw L/D of 20:1–24:1 and compression ratio of 2.0:1–2.5:1 are adequate for homogenization without excessive shear. Melt temperature excursions above 240°C can produce a measurable yellow shift before mechanical loss is detected, so hot-runner manifold zones should be profiled so that no zone exceeds the barrel set-point by more than 5°C.
Capillary rheometry of unfilled ABS in the 15–25 g/10 min melt-flow range typically shows apparent viscosity between 200 and 400 Pa·s at 220°C and a shear rate of 100 s⁻¹, falling to 50–120 Pa·s at 1,000 s⁻¹ when measured according to ISO 11443:2021. This shear-thinning behaviour supports thin-wall filling, but gate land shear should be controlled. For wall thickness of 1.2–2.5 mm, gate diameter should not fall below 0.8 mm; smaller gates increase shear heating and may yellow the natural resin at the gate vestige. Hot-runner channels should be sized for shear rates below 50,000 s⁻¹ where practical. Published data for this specific Dongguan Anshuyi designation is limited; the cited rheological window is representative of unfilled ABS in this flow class and should be confirmed by on-press injection-pressure curve analysis or capillary measurement on the actual lot.
Tooling dimensions for the natural grade require a mould shrinkage allowance of 0.4–0.7% as defined in ISO 294-4:2018, with the exact value depending on wall thickness, gating, and hold pressure. Cooling circuits should maintain turbulent flow; a Reynolds number above 10,000 is desirable to avoid laminar flow and non-uniform shrinkage. On a 1,200 kN hydraulic injection moulding machine with a full-flight screw, short-shot studies typically begin at the lower limit of the melt window and raise injection speed until the cavity fills without flash; hold pressure is then increased until gate freeze and sink are eliminated. Specific injection pressure commonly ranges from 70–120 MPa, and clamp force requirement is approximately 3–5 kN/cm² of projected area. Insufficient clamp force may produce flash at the parting line, particularly when packing pressure is increased to control sink. Suitable end uses for this general-purpose ABS grade include appliance control-panel housings, vacuum cleaner shells, consumer electronics enclosures, business-machine covers, printer trays, and industrial guards. Parts that require food-contact acceptance are not automatically cleared by the resin grade; they must be evaluated against FDA 21 CFR 177.1020 or the corresponding regional migration standard after finished-article testing.
Comparative Mechanical, Thermal, and Regulatory Data
Table 1 summarises representative physical, mechanical, and thermal values for unfilled natural ABS in this general-purpose flow class. The values are drawn from standard test methods for ABS terpolymers and supplier technical documentation for comparable grades; they are not batch-release limits. For specification-critical components, the certificate of analysis for the exact lot of Dongguan Anshuyi ABS 346A-709 Nature should be used as the controlling document.
| Property | Test method | Representative range |
|---|---|---|
| Density | ISO 1183-1:2019 | 1.04–1.06 g/cm³ |
| Melt mass-flow rate | ISO 1133-1:2022, 220°C/10 kg | 15–25 g/10 min |
| Tensile yield stress | ISO 527-2:2012, Type 1A, 50 mm/min | 40–50 MPa |
| Tensile elongation at yield | ISO 527-2:2012 | 2–4% |
| Tensile elongation at break | ISO 527-2:2012 | 10–25% |
| Flexural modulus | ISO 178:2019 | 2,000–2,600 MPa |
| Flexural strength | ISO 178:2019 | 55–75 MPa |
| Charpy notched impact | ISO 179-1:2010, 23°C | 15–30 kJ/m² |
| Charpy notched impact | ISO 179-1:2010, −30°C | 5–10 kJ/m² |
| Heat deflection temperature | ISO 75-2:2013, 1.8 MPa | 85–95°C |
| Vicat softening temperature | ISO 306:2022, B50 | 95–105°C |
| Ball indentation hardness | ISO 2039-1:2018 | 90–110 MPa |
| Water absorption | ISO 62:2008, 24 h/23°C | 0.3–0.7% |
| Mould shrinkage | ISO 294-4:2018 | 0.4–0.7% |
| Flammability | UL 94 | HB at 1.5 mm typical for unfilled natural ABS; listing required |
Table 2 lists the standard-based compliance assessments that are applied to natural ABS supplied for general-purpose moulding. Regulatory status is not absolute; it depends on batch composition, pigment-free status, and the final article thickness.
| Standard or regulation | Assessment scope | Typical declaration basis |
|---|---|---|
| RoHS Directive 2011/65/EU Annex II | Homogeneous-material restricted substances | 0.1 wt% Pb, Hg, CrVI, PBB, PBDE; 0.01 wt% Cd |
| REACH Regulation (EC) No 1907/2006 | Candidate List substances of very high concern | 0.1 wt% per article; batch-specific confirmation required |
| FDA 21 CFR 177.1020 | Acrylonitrile-butadiene-styrene for food contact | Resin may be permitted if finished-article migration limits are met; not self-certifying |
| UL 94 | Flammability of plastic materials | HB at 1.5 mm typical for unfilled natural ABS; V-0 not applicable |
| Regulation (EU) 10/2011 | Plastics food-contact overall migration | 10 mg/dm²; finished-article testing mandatory |
When Natural ABS 346A-709 Nature Is Substituted for Pre-Coloured, Heat-Resistant, Flame-Retardant, or PC/ABS Grades
Compared with pre-coloured ABS, the Nature grade eliminates the additional thermal history and potential pigment dispersion variability of ready-coloured compounds. However, the absence of opacifying pigments reduces ultraviolet stability; unpigmented surfaces may exhibit photoyellowing and embrittlement under sustained outdoor exposure unless a UV-stabilised formulation or opaque coating is used. Compared with heat-resistant ABS grades, which can exhibit Vicat softening temperatures above 110°C, ABS 346A-709 Nature is a general-purpose product with a Vicat B50 range of 95–105°C; continuous service should be limited to 60–80°C under low mechanical load. Compared with flame-retardant ABS rated V-0 at 1.5 mm under UL 94, the unfilled natural grade is typically HB and is not a substitute for electrical enclosures, battery housings, or other applications requiring defined flammability certification.
Compared with PC/ABS blends, the natural ABS grade has lower heat deflection, lower multi-axial impact, and lower flexural modulus but offers easier flow and less demanding drying; PC/ABS typically requires drying at 100–110°C and melt temperatures above 250°C. The linear coefficient of thermal expansion for unfilled ABS is typically 70–100 µm/m·°C when measured according to ISO 11359-2:1999, which is higher than some PC/ABS blends; thermal expansion mismatch must be considered when the part is assembled with metal inserts or larger metallic housings. Compared with ASA, which retains surface appearance and impact after weathering to ISO 4892-2:2013, unfilled natural ABS without UV modification is not recommended for exterior automotive or outdoor enclosure use. For filled ABS grades containing glass fibre or mineral, tensile modulus may exceed 4,000 MPa, while unfilled natural ABS remains below 2,600 MPa; this lower modulus is beneficial for snap-fit assemblies but reduces load-bearing capacity.
Solvent exposure data for ABS indicate that aliphatic hydrocarbons and dilute aqueous acids are generally acceptable for short-term contact, while aromatic hydrocarbons, ketones, esters, and chlorinated solvents can induce environmental stress cracking. Acetone, methyl ethyl ketone, toluene, and methylene chloride should not be used for cleaning natural ABS surfaces, and adhesives or paints should be screened on moulded plaques before full-scale use.
Incoming inspection of Dongguan Anshuyi ABS 346A-709 Nature commonly includes melt mass-flow rate according to ISO 1133-1:2022, density by ISO 1183-1:2019, moisture content by Karl Fischer or loss-on-drying, and visual pellet colour on a pressed plaque. Lot-to-lot MFR variation within the published range can alter fill pressure and sink behaviour in thin-wall tools; therefore, processors should adjust hold pressure and melt temperature when a new lot enters the production schedule. For parts with dimensional or impact requirements, batch acceptance should include notched Charpy impact at 23°C and tensile yield stress according to ISO 527-2:2012. The absence of pigment eliminates colour-lot matching but also means translucent natural plaques can reveal contamination or black specks more readily than black or opaque pre-coloured grades.
Because the Nature designation is unpigmented, visual quality is sensitive to thermal history and machine cleanliness. Residual PVC, acetal, or polyethylene contamination can generate delaminated streaks, brown specks, or chemical degradation products. Purging with general-purpose ABS or a commercial purging compound after material changes is advised, particularly when switching from heat-sensitive polymers. Reprocessed natural ABS can be melt-blended with virgin pellets at concentrations up to 20–30% for non-safety-critical components, but each regrind cycle reduces butadiene-phase impact retention and increases yellowing risk. Repeated extrusion cycles can lower melt viscosity through chain scission while increasing yellowing; a maximum of two regrind cycles is common for non-appearance parts, but impact-sensitive mouldings may require a lower threshold. Retained notched Charpy impact after regrind should be verified to ISO 179-1:2010. Hot-runner manifold dead zones and screw check-ring wear are the principal equipment-related causes of black specks and inconsistencies in natural unpigmented ABS; check-ring non-return leakage should be monitored by observing injection cushion stability to within ±1 mm.
