ABS-Chi Mei POLYLAC PA-757
ABS-Chi Mei POLYLAC PA-757 is a premium general-purpose acrylonitrile butadiene styrene copolymer engineered by Chi Mei Corporation, celebrated for its exceptional surface gloss, high rigidity, and robust medium-impact resistance[2][3]. Featuring a density of 1.05 g/cm³ and a stable melt flow index of 1.8 g/10 min (at 200°C/5kg), this grade is the global standard for high-aesthetic consumer electronics, household appliance bezels, and structural toy components[4]. Jucheng Precision, under IATF 16949 and ISO 9001 quality frameworks, specializes in molding POLYLAC PA-757 to yield high-gloss, defect-free parts. Supported by our 5-axis CNC mirror-polished tooling and 35+ advanced injection presses, we prevent weld lines and control shrinkage (0.4%-0.7%), verified by Zeiss CMM inspection.
POLYLAC PA-757 Mechanical & Aesthetic Profile
POLYLAC® PA-757 is a premium general-purpose ABS copolymer engineered by Chi Mei Corporation, designed to provide high surface hardness, medium impact strength, and an exceptional gloss finish:
| Property Standard | POLYLAC PA-757 Typical Metric | Molding & End-Use Advantage |
|---|---|---|
| Surface Hardness | Rockwell Hardness 116 R-Scale | Provides exceptional scratch resistance and solid hand feel, ensuring consumer casings retain a premium look over long-term use. |
| Stiffness-Impact Balance | Flex Modulus 2650 MPa / Impact 190 J/m | Combines robust structural load-bearing rigidity with decent drop-test impact strength for dynamic outer enclosures. |
| Process Melt Flow | MFR 1.8 g/10 min (200°C x 5kg) | Delivers outstanding mechanical strength and viscosity stability, minimizing gate blush and cold-flow marks on large cosmetic parts. |
Process & Aesthetic Adaptability for POLYLAC PA-757
With excellent flow uniformity and high gloss potential, POLYLAC PA-757 processes reliably across advanced molding lines:
| Process Category | Molding Compatibility & Operational Details |
|---|---|
| High-Gloss Consumer Electronics | Excellent. Highly optimized for gaming controllers, smart home hubs, cosmetic console shells, and luxury speaker housings requiring a piano-black mirror finish. |
| Structural & Mechanical Components | Excellent. Well-suited for heavy-duty household appliance bezels, office copier internal frames, and rigid structural toy blocks. |
| Overmolding & 2K Assemblies | Good. Acts as a highly rigid base substrate that overmolds beautifully with TPE or TPU soft elastomers, creating secure, high-aesthetic grips. |
ABS-Chi Mei POLYLAC PA-757 Tooling & Gloss Optimization Guide
Molding an amorphous polymer like POLYLAC PA-757 requires strict thermal boundaries and diamond-polished tools to eliminate splay and visible knit lines:
- Prisinte Gloss Surface (Mirror-Finished Molds): To exploit PA-757’s high-gloss potential, Jucheng’s tooling division uses hardened S136 stainless steel mold cavity inserts heat-treated to 50 HRC and mirror-polished with high-grade diamond pastes. This ensures flawless aesthetic replication directly from part ejection.
- Hygroscopic Splay Prevention: ABS is moderately hygroscopic. Pre-drying in desiccant dryers at 80°C–85°C (176°F to 185°F) for 2–4 hours is mandatory. Failure to dry will result in moisture-induced splay, silver streaks, and loss of tensile strength.
- Melt and Mold Temperature Control: Barrel temperatures are kept tightly at 200°C–240°C (392°F to 464°F) to prevent thermal degradation. Mold temperatures are managed between 40°C and 80°C (104°F to 176°F) to maximize surface gloss, reduce internal stresses, and completely eliminate weld lines near bosses.
- Stable Low Shrinkage: POLYLAC PA-757 exhibits low and predictable shrinkage (0.4% to 0.7%), supporting high-precision dimensions. Our five-axis CNC machines cut highly accurate cavities with conformal cooling loops to prevent thermal warpage.
Key Application Fields for ABS-Chi Mei POLYLAC PA-757
- Consumer Electronics: High-gloss television bezels, gaming console housings, remote control bodies, high-aesthetic printer covers, and router housings.
- Household Appliances: Air conditioner front panels, washing machine control surrounds, vacuum cleaner bodies, and kitchen coffee maker structural shells.
- Precision Consumer Products: Robust structural toys, high-grade snap-fit storage bins, cosmetic containers, and heavy-duty protective cases.
Properties
| Density | 1.05 g/cm³ |
| Melt Mass-Flow Rate (MFR) (200°C/5.0kg) | 1.8 g/10 min |
| Melt Mass-Flow Rate (MFR) (220°C/10.0kg) | 19 g/10 min |
| Tensile Strength at Yield | 47 MPa |
| Tensile Elongation at Break | 20 % |
| Flexural Strength | 80 MPa |
| Flexural Modulus | 2,650 MPa |
| Izod Notched Impact Strength (1/8", 23°C) | 190 J/m |
| Rockwell Hardness (R-Scale) | 116 - |
| Vicat Softening Point (50°C/hr, 5kg) | 105 °C |
| Heat Deflection Temperature (HDT @ 1.82 MPa) | 88.0 °C |
| Linear Mold Shrinkage | 0.40 - 0.70 % |
| Flammability Rating (1.6mm) | UL 94 HB - |
| Maximum Part Size | 1000 x 800 mm |
| Minimum Part Size | 1 x 1 mm |