CHIMEI (Chi Mei) ABS PA-758S
- Product Name: CHIMEI (Chi Mei) ABS PA-758S
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- CHIMEI (Chi Mei) ABS PA-758S is typically used in formulations when impact resistance and melt processing parameters must be controlled within specific ranges.
| HS Code | 303263 |
| Product | CHIMEI (Chi Mei) ABS PA-758S |
| Manufacturer | CHIMEI |
| Polymer Type | Acrylonitrile Butadiene Styrene (ABS) |
| Grade | PA-758S |
| Form | Pellets |
| Processing Method | Injection molding |
| Density | 1.04 g/cm³ |
| Melt Flow Rate | 45 g/10 min (220 °C/10 kg) |
| Tensile Strength | 39 MPa |
| Flexural Modulus | 2000 MPa |
| Notched Izod Impact Strength | 180 J/m |
| Heat Deflection Temperature | 85 °C |
| Vicat Softening Temperature | 95 °C |
| Flammability Rating | HB |
| Drying Temperature | 80 °C |
| Drying Time | 2-4 h |
As an accredited CHIMEI (Chi Mei) ABS PA-758S factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | CHIMEI ABS PA-758S is supplied in 25 kg moisture-resistant paper bags, palletized for industrial shipment and handling. |
| Container Loading (20′ FCL) | CHIMEI ABS PA-758S is loaded in a 20-foot FCL container, with palletized 25 kg bags secured for safe ocean transport. |
| Shipping | CHIMEI ABS PA-758S is shipped as non-hazardous polymer pellets, typically in 25 kg moisture-barrier bags on pallets. Transport in dry, ventilated vehicles; protect from direct sunlight, heat, moisture, and contamination. No special dangerous-goods classification is required; follow normal industrial hygiene and avoid ignition sources. |
| Storage | Store CHIMEI ABS PA-758S in original sealed bags/containers in a cool, dry, well-ventilated warehouse, away from direct sunlight, heat, flames, and moisture. Keep pallets off the floor and away from strong oxidizers or contaminants. Maintain moderate temperature and humidity, use stock rotation, follow the supplier SDS, avoid prolonged UV exposure, and reseal/dry opened bags per processing recommendations. |
| Shelf Life | Store in a cool, dry place away from sunlight; shelf life is 12 months in original unopened packaging under recommended conditions. |
Front grille and headlamp bezel substrates manufactured from PA-758S require a pellet feed composition of 100 wt% virgin resin; regrind incorporation above 20 wt% is not permitted on electroplating lines because recycled hot-runner scrap raises gel count and generates etch pits with non-uniform depth during the chromic acid stage. The resin is dried in a desiccant dryer with a dew point below -30°C for 3–4 h at 80°C, reducing moisture below 0.02% by Karl Fischer titration before the reciprocating screw injection molding machine reaches the feed throat. Barrel temperature set points are maintained at 230°C, 240°C, and 245°C from feed zone to nozzle, with a mold surface temperature between 60°C and 80°C. A 3-zone screw with an L/D ratio of 20:1 to 25:1 and a non-return valve is standard; fill speed is reduced at the gate to avoid jetting, and holding pressure is set to the minimum required to eliminate visible sink. Excessive packing pressure creates oriented residual stress that accelerates chromic-sulfuric acid attack along flow fronts, producing branched etch pits that reduce peel strength measured per ASTM B533. After molding, the substrate is conditioned at 23°C ± 2°C and 50% ± 5% relative humidity for 24 h before electroplating per ASTM B604-91(2019). The rack plating line sequences through alkaline soak cleaning, chromic-sulfuric acid etch at 60°C to 70°C, neutralization, Pd/Sn colloid activation, electroless nickel at 0.2–0.5 µm, electrolytic copper at 15–25 µm, semi-bright nickel 8–12 µm, bright nickel 8–12 µm, microporous nickel 0.5–1.5 µm, and chromium 0.25–0.5 µm. Corrosion resistance is tested per ASTM B368-21 for 48 h; the minimum acceptable rating is 9 with no blistering at the scribe lines. Terminal finished products are radiator grille surrounds, headlamp bezel rings, and mirror distal scalps supplied to automotive tier-1 decorative trim programs.
Why Does PA-758S Maintain Plating Adhesion in Faucet Handles After 96-Hour CASS Exposure?
For lavatory faucet handles and shower trim rings, PA-758S is fed at 100 wt% virgin pellet feed; cold-runner sprue regrind is limited to 15 wt% and only after same-lot drying at 80°C for 4 h, because even 5 wt% of contaminated regrind from dusty granulators produces surface haze that a 20 µm bright copper layer cannot conceal. The injection tool for faucet handles typically uses SPI A-1 or A-2 cavity finishes and a mold surface temperature of 60°C to 70°C; gate location is placed on the stem end rather than the visible dome to keep gate blush outside the plated appearance surface. Wall sections for bath spout trim range from 3 mm to 5 mm, requiring a fill time of 1.0–1.5 s and a clamp force calculated at 2.5–3.5 kN/cm² of projected area; hot runner systems with externally heated manifolds are run without shut-off nozzle dead zones because material stagnation increases gel count. The electroplating line uses a chromic-sulfuric etch bath at 55°C to 65°C for 5–8 min, with air agitation rather than mechanical stirring to avoid directional etching. Layer thickness is then built as electrolytic copper 20–30 µm, semi-bright nickel 8–12 µm, bright nickel 8–12 µm, microporous nickel 0.5–1.0 µm, and chromium 0.25–0.8 µm. The plated faucet handles are tested per ASTM B368-21 for 96 h CASS with a minimum rating of 9; thermal shock cycling from 5°C to 80°C for 10 cycles is used to verify adhesion. Mechanical endurance of the assembled handle is validated under ASME A112.18.1/CSA B125.1. Terminal finished product types are lavatory faucet handles, shower trim rings, and diverter knobs.
| End-use segment | Copper layer (µm) | Semi-bright Ni (µm) | Bright Ni (µm) | Microporous Ni (µm) | Chromium (µm) | Primary acceptance test |
|---|---|---|---|---|---|---|
| Automotive bright trim | 15–25 | 8–12 | 8–12 | 0.5–1.5 | 0.25–0.5 | ASTM B368-21 48 h rating ≥ 9 |
| Sanitary fittings | 20–30 | 8–12 | 8–12 | 0.5–1.0 | 0.25–0.8 | ASTM B368-21 96 h rating ≥ 9 |
| Cosmetic packaging | 10–15 | — | 8–10 | — | 0.2–0.3 | EN 1811:2011 + A1:2015 release < 0.5 µg/cm²/week |
| Appliance control knobs | 15–25 | 8–12 | 8–12 | 0.5–1.0 | 0.25–0.5 | Thermal shock -40°C to 85°C, 10 cycles |
| Nameplates and badges | 20–30 | 10–15 | 5–10 | 0.5 optional | 0.3–0.5 | ASTM B533 peel strength per OEM print |
| Building hardware | 15–25 | 8–12 | 8–12 | 0.5–1.0 | 0.25–0.5 | EN 1811:2011 + A1:2015 if skin contact |
Cosmetic packaging closures electroplated with PA-758S are constrained less by CASS rating and more by REACH Annex XVII entry 27 nickel release limits, because lipstick sleeves and fragrance caps are manipulated by bare skin for periods exceeding 10 min. The resin is fed at 100 wt% virgin pellets without color masterbatch; the absence of pigment agglomerates is critical because any particle larger than 20 µm creates a void during chromic-sulfuric etch that develops into a visible unplated pit after chromium deposition. Injection molding uses high-gloss SPI A-1 cavity surfaces maintained at 60°C to 70°C; fill speed is set to produce a frozen skin layer but avoid jetting, and holding pressure is transferred early to minimize gate stress. The electroplating sequence at the cosmetic packaging tier uses a thinner copper layer, typically 10–15 µm, followed by 8–10 µm bright nickel and 0.2–0.3 µm chromium; after plating, the external surface is coated with a 5–10 µm UV-curable clear lacquer when fingerprint resistance is required, but lacquer selection is validated for adhesion using ISO 2409 cross-hatch. Compliance is documented under EN 1811:2011 + A1:2015 for nickel release, with migration below 0.5 µg/cm²/week for articles in prolonged skin contact, and under EU 2011/65/EU RoHS for restricted substances in the ABS substrate and plated layers. Terminal finished product types include jar lids, lipstick cases, fragrance cap shells, and compact mirror covers.
When Dishwasher Control Knobs Require Laser Etching After Micro-Porous Nickel Plating
In dishwasher and washing machine control knob production, the PA-758S feed is held at 100 wt% virgin pellets; antistatic additives and external mold-release sprays are excluded because residues reduce electroless nickel coverage at the base of shallow dial indicators. Molding is performed with a mold temperature of 50°C to 60°C and a slow injection speed at the gate to prevent flow hesitation; the gate is located on a non-appearance surface or on an edge later covered by a stainless steel spring clip. After molding, the knobs are rack-plated with 15–25 µm copper, 8–12 µm semi-bright nickel, 8–12 µm bright nickel, 0.5–1.0 µm microporous nickel, and 0.25–0.5 µm chromium. Laser etching is performed at 1064 nm wavelength and 20–30 W power to remove the plated layer and expose the ABS surface for backlit indicator windows. The production bottleneck is the adhesion between the laser-etched edge and the plated layer; if the microporous nickel is below 0.5 µm, delamination occurs during thermal shock testing per IEC 60335-1 sub-zero to 85°C cycles. The ABS substrate is additionally assessed under UL 94 HB. Terminal finished product types are dishwasher control knobs, washing machine rotary selectors, and oven timer dials.
| Application segment | Standard or test method | Acceptance criterion |
|---|---|---|
| Automotive bright trim | ASTM B604-91(2019), ASTM B533 | No blistering after 48 h ASTM B368-21; peel strength per OEM print |
| Sanitary fittings | ASME A112.18.1/CSA B125.1, ASTM B368-21 | 96 h CASS rating ≥ 9 |
| Cosmetic packaging | REACH Annex XVII entry 27, EN 1811:2011 + A1:2015, EU 2011/65/EU | Nickel release < 0.5 µg/cm²/week |
| Appliance control knobs | IEC 60335-1, UL 94 HB | Thermal shock -40°C to 85°C, no delamination |
| Nameplates and badges | ASTM B604-91(2019), ASTM B533, EU 2011/65/EU | Peel strength per OEM drawing; RoHS compliance |
| Building hardware | EU 2011/65/EU, REACH SVHC, EN 1811:2011 + A1:2015 | Nickel release < 0.5 µg/cm²/week where skin contact occurs |
Automotive nameplates and liftgate badges molded from PA-758S are processed as flat or slightly curved plaques with wall thickness between 2 mm and 3 mm. The pellet stream is maintained at 100 wt% virgin PA-758S; in-mold texture is produced by tool surface rather than chemical blowing agents, since gas bubbles near the surface are amplified in the etch bath and appear as pits after bright chromium. Drying is executed at 80°C for 3–4 h; the feed throat is kept under nitrogen blanket if ambient relative humidity exceeds 60%. Injection molding uses a sequential valve gate system for letterforms to avoid weld lines across the badge face; weld lines in electroplating-grade ABS are preferential etch sites and form hairline defects after chromium. The plating stack for badges includes 20–30 µm copper to level micro-waviness, 10–15 µm semi-bright nickel, 5–10 µm bright nickel, and 0.3–0.5 µm chromium; some OEM prints specify a microporous nickel strike of 0.5 µm before chromium to improve corrosion resistance on fender badges exposed to salt spray. Peel strength is measured per ASTM B533; acceptance values are specified on OEM drawings, and published general industry data for this badge configuration is limited. Compliance is supported by ASTM B604-91(2019), EU 2011/65/EU RoHS, and REACH SVHC screening. Terminal finished product types are hood badges, liftgate letter clusters, and fender nameplates.
Electroplated ABS Interior Building Hardware and Decorative Trim Systems
For door lever escutcheons, cabinet knobs, and display fixture endcaps, PA-758S is processed at 100 wt% virgin pellet feed; post-industrial regrind may be used up to 20 wt% only when the regrind is produced from the same lot and dried at 80°C for 4 h in a desiccant dryer with dew point below -30°C. Unlike automotive parts, building hardware components are plated in rack configurations; barrel plating is rejected for appearance domes because tumbling generates micro-scratches that bright nickel magnifies. The chromic-sulfuric etch is maintained at 55°C to 65°C to preserve matte and satin textures; etch time is shortened by 20–30% relative to automotive plaques for parts with fine grain texture, because over-etching rounds grain peaks and reduces tactile definition. Plated layer thicknesses are 15–25 µm copper, 8–12 µm semi-bright nickel, 8–12 µm bright nickel, 0.5–1.0 µm microporous nickel, and 0.25–0.5 µm chromium; microporous nickel is retained where the hardware is exposed to hand sweat in high-traffic corridors. Compliance is documented under EU 2011/65/EU RoHS Annex II, REACH SVHC screening, and EN 1811:2011 + A1:2015 for nickel release where the plated surface is touched by skin; release values below 0.5 µg/cm²/week are required for articles in prolonged skin contact. Terminal finished product types are door lever escutcheons, cabinet knobs, display fixture end caps, and retail display hooks.
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- CHIMEI (Chi Mei) ABS PA-758S 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.
CHIMEI (Chi Mei) ABS PA-758S is an injection-molding grade of acrylonitrile-butadiene-styrene terpolymer supplied within the Polylac series. The material is positioned as a high-flow ABS for thin-wall and long-flow-length mold filling where melt viscosity, rather than elevated melt temperature, controls filling pressure and surface appearance. Because PA-758S is an amorphous terpolymer, it does not exhibit a discrete melting point; processing behavior is governed by glass transition dynamics, pseudoplastic melt rheology, and the thermal degradation kinetics of the polybutadiene phase. Commercial technical bulletins list the grade for injection-molded components such as telephone and office-equipment enclosures, appliance fascia, computer peripheral housings, and high-gloss covers that require replication of polished tool surfaces. PA-758S should not be assumed to be a dedicated electroplating grade unless etch performance and metal deposit adhesion have been qualified on production-scale tooling and plating line fixtures.
What Distinguishes PA-758S From Medium-Flow ABS Grades in Thin-Wall Mold Filling?
The primary distinction is rheological. Under ASTM D1238 at 220 °C with a 10 kg load, PA-758S is reported in commercial datasheets with a melt mass-flow rate typically higher than that of general-purpose Polylac PA-757 and other medium-flow ABS grades. The elevated melt flow rate corresponds to lower melt viscosity at injection shear rates, which permits reduced injection pressure demand, increased cavity count, or shorter cycle time in multi-cavity tools. In thin-wall work, the practical benefit is most evident when nominal wall thickness falls below 1.2 mm and flow length-to-thickness ratio exceeds 150:1. On 800–1,500 kN toggle-clamp injection molding machines using general-purpose screws with 22:1 or 24:1 L/D ratios, the viscosity difference may allow a lower transfer pressure or a lower melt temperature while maintaining complete filling. Published spiral-flow lengths for PA-758S are limited; processors therefore verify filling behavior with in-mold pressure transducers and short-shot studies rather than relying solely on melt flow rate.
At apparent shear rates between 100 s⁻¹ and 1,000 s⁻¹, high-flow ABS displays pseudoplastic behavior: apparent viscosity decreases as shear rate increases, with power-law index below 1.0. PA-758S is formulated for lower zero-shear viscosity than medium-flow ABS, but the relative viscosity gap narrows under high shear because both grades shear-thin. This means the benefit of PA-758S is greater in thin-wall sections and high-speed filling; however, lower melt strength can increase the tendency for jetting, gate blush, or drool in hot-runner drops. Gate geometry and injection velocity profile must therefore be adjusted when switching from a medium-flow grade. In valve-gated hot-runner systems, valve stem timing and holding pressure require re-qualification to avoid hesitation and overpacking of the last-filled cavities.
Thermal and Rheological Property Benchmarks for PA-758S
Representative property ranges assembled from published PA-758S datasheets are tabulated below. Values apply to conditioned specimens tested at 23 °C and 50 % relative humidity unless otherwise specified. Lot-specific certificate-of-analysis data take precedence; colorants, regrind content, and molding conditions shift measured values, particularly impact strength. The ranges are not certification limits and should not be used as release criteria without supplier confirmation.
| Test method | Property | Representative range |
|---|---|---|
| ASTM D792 / ISO 1183-1 | Density | 1.04–1.06 g/cm³ |
| ASTM D1238 / ISO 1133-1:2022 | Melt mass-flow rate, 220 °C, 10 kg | 40–60 g/10 min |
| ASTM D638-14 | Tensile stress at yield | 41–47 MPa |
| ASTM D638-14 | Tensile elongation at break | 10–25 % |
| ASTM D790 | Flexural modulus | 2,000–2,400 MPa |
| ASTM D256 | Izod notched impact strength, 23 °C | 15–25 kJ/m² |
| ASTM D648 | Deflection temperature under load, 1.82 MPa | 78–88 °C |
| UL 94 | Flammability at 1.5 mm thickness | HB typical |
The tabulated data indicate the expected trade-off in the high-flow ABS segment: melt flow is elevated relative to high-impact grades, while notched Izod impact and heat deflection temperature are lower than those of high-impact ABS formulations. Because ABS is a two-phase system, Izod impact strength is strongly sensitive to butadiene particle size distribution, grafting efficiency, and SAN matrix molecular weight. The high-flow formulation of PA-758S may therefore show lower toughness than medium-impact or high-impact grades in the same Polylac family; the relationship between melt flow rate and impact loss is not linear. For impact-critical parts, notched Izod values from ASTM D256 should be interpreted together with ductile-brittle transition behavior and multiaxial impact data from ISO 6603-2. Processors should also verify lot-specific heat deflection temperature before using the grade in under-hood or heat-generating appliance enclosures.
When PA-758S Replaces Medium-Impact ABS in High-Gloss Enclosures or Electroplating Trials
High-gloss and electroplating applications impose different requirements. PA-758S may be selected for polished mold surfaces because its higher melt flow aids replication of microtextured cavity geometry; however, surface gloss is not solely a material property. Mold temperature, packing pressure, gate freeze time, and cooling rate control the final polished appearance. For electroplating trials, the molded part must undergo chromic acid or chromium-free etching to create microporous surface topography for electroless copper or nickel deposition and subsequent mechanical anchoring. Dedicated electroplating ABS grades are formulated with controlled butadiene particle size distributions and crosslink densities that produce uniform etch pit formation. PA-758S is positioned as a high-flow general-purpose grade and may exhibit greater sensitivity to etch bath temperature, etch time, and bath agitation. Published data for PA-758S electroplating peel strength is limited. Qualification should include ASTM B533 peel adhesion testing after thermal cycling, and adhesion promotion should not be assumed to correct inconsistent etch morphology. If the replacement is intended for decorative chrome plating on non-load-bearing interior parts, the minimum peel strength should be defined from the production plating line, not from laboratory plaques.
This substitution also affects paint adhesion and solvent resistance. Lower melt viscosity may improve flow-line concealment in high-gloss black or high-gloss white enclosures, but it does not eliminate weld lines. When PA-758S is compared with a medium-impact ABS or a dedicated plating grade, the differences in rubber morphology can shift the response of the molded surface to acid etching and subsequent adhesion. Therefore, each colorant package and regrind fraction should be qualified as a separate system, because pigment dispersion and low-molecular-weight additives may alter surface wetting and etch uniformity.
Prior to molding, pellets should be dried to a residual moisture content below 0.05 % by weight, measured by ISO 15512 Method B or equivalent. A desiccant dryer producing air with a dew point below -20 °C, operated at an inlet air temperature of approximately 80 °C, typically reaches this target in 2 to 4 hours for virgin material. The required drying time increases when ambient relative humidity exceeds 60 %, when regrind is present, or when storage containers have been opened for extended periods. Regrind particles have higher specific surface area and may promote channeling in the drying hopper; feed screw speed and hopper fill level should be reduced to maintain residence time. Melt temperature measured at the nozzle should be maintained in the range of 210–240 °C for high-flow ABS. Barrel residence time should not exceed 5 minutes at maximum settings because thermal degradation of the polybutadiene phase causes yellowing, loss of Izod impact strength, and generation of conjugated species. A general-purpose injection screw with 20:1 to 24:1 L/D, compression ratio 2.2:1 to 2.8:1, and a low-dead-volume non-return valve is suitable. Mold temperature is normally 40–80 °C; higher mold temperatures improve gloss transcription and knit-line strength but increase cycle time and cooling load.
How Does Batch-to-Batch Melt Viscosity Variation Affect Thin-Wall Production?
Incoming lot variation in melt flow rate directly shifts filling behavior in thin-wall tools. Commercial ABS specifications often state a melt mass-flow rate tolerance of approximately ±10 % relative to the nominal datasheet value. A shift of 5 g/10 min in ASTM D1238 melt flow rate may change fill time, transfer position, and cavity pressure profile, particularly in multi-cavity tools with flow-length-to-thickness ratios above 120:1. On a 1,000 kN toggle-clamp press with a 36 mm diameter screw, lot-to-lot viscosity variation can be detected by nozzle pressure sensors and cavity pressure transducers. Machine settings should not remain fixed when the certificate of analysis indicates that a new lot lies at the opposite end of the specification range. Processors control such variation by adjusting switch-over point, holding pressure, and melt temperature within the qualified window. For hot-runner systems, valve-gate opening timing may also require adjustment to prevent sequential filling defects or overpacking of the first-filled cavities.
A stable melt cushion of 2–4 mm at transfer is typically maintained to avoid cushion loss and shot-volume variation. The non-return valve should be inspected for wear when cavity pressure consistency drifts beyond the normal lot-to-lot range. Because PA-758S is a high-flow grade, even small changes in melt temperature produce measurable changes in melt viscosity; nozzle thermocouple deviation and heater band cycle time should be calibrated before attributing filling instability to the resin. Published data for this specific lot-to-lot configuration is limited, so processors are advised to conduct incoming resin melt flow checks and retain molded plaque samples for impact and gloss comparison.
Compliance Positions Vary by Lot, Region, and End-Use Application
Compliance claims for PA-758S are supplier-issued and application-dependent. The following table records standard designations commonly associated with ABS grades supplied into electrical enclosures and consumer articles. The absence of a listed certificate from a specific lot does not constitute a regulatory exemption, and the compounder or converter remains responsible for end-article compliance.
| Requirement | Designation or method | Typical position |
|---|---|---|
| Restriction of hazardous substances | RoHS Directive 2011/65/EU, amended by (EU) 2015/863 | Supplier declaration required; commonly available for natural and standard colors |
| REACH Regulation | Regulation (EC) No 1907/2006, Article 33 SVHC communication | Lot-specific producer statement tied to region |
| Flammability | UL 94 at 1.5 mm thickness | Class HB typical; color-specific testing required |
| Material designation | ISO 1043-1:2011 + A1:2016 | Acrylonitrile-butadiene-styrene, injection molding grade |
| Food-contact suitability | FDA 21 CFR 177.1020 | Not automatically conveyed; migration testing required by converter |
| Electrical end-product safety | IEC 62368-1 | Material flame class alone does not satisfy end-product evaluation |
For electrical enclosures evaluated under IEC 62368-1, a UL 94 HB material classification at thickness is only one input; the assembled part must satisfy the relevant fire enclosure, thermal, and electrical spacing requirements. Translucent grades, heavily pigmented variants, or regrind-containing lots may require separate flammability testing because colorants and additive packages can shift ignition resistance.
Post-molding shrinkage of PA-758S is not a single material constant. It varies with mold temperature, packing pressure, gate geometry, insert location, and wall thickness. Cavity dimensioning should be based on shrinkage measurements from the same tool geometry, not from generic ABS reference values. High-flow ABS grades are often assigned mold shrinkage values in the range of 0.4 % to 0.7 % per ISO 294-4, but actual values depend on packing time and cooling layout. For tight-tolerance enclosures, parts should be conditioned at 60 °C for 1 hour to relieve molded-in stress before dimensional inspection; published data for this specific conditioning scenario is limited. The material should not be mixed with acetal residues, polycarbonate scrap, or PVC contaminants because melt-phase incompatibility causes delamination and gas evolution. Ketone-based solvents and strong oxidizing agents should be excluded from cleaning operations because they induce environmental stress cracking in molded ABS parts. These operational boundaries define the practical substitution envelope for PA-758S in production environments.
