Chimei Polylac® PA-77NB ABS
Polylac® PA-77NB ABS Resin High Heat Grade
Chimei POLYLAC PA-77NB is a high-heat ABS resin engineered for demanding applications. Combining exceptional heat resistance (Vicat 115°C) with low VOC emissions and a low-gloss finish, this POLYLAC® ABS variant ensures durability and compliance for automotive interiors, electronics, and industrial components.
Typical property data
Physical Properties
- Melt Flow Index: 10 ml/10 min (ISO 1133, 220°C × 10 kg)
- Mass Density: 1.06 g/cm³ (ISO 1183, 23°C)
Mechanical Properties
- Tensile Strength (Yield): 45 MPa (ISO 527, 50 mm/min)
- Tensile Elongation: 40% (ISO 527, 50 mm/min)
- Flexural Strength: 70 MPa (ISO 178, 2 mm/min)
- Flexural Modulus: 2.2 GPa (ISO 178, 2 mm/min)
- Izod Impact Strength (Notched, 23°C): 23 KJ/m² (ISO 180/1A)
- Charpy Impact Strength (Notched, 23°C): 21 KJ/m² (ISO 179)
Thermal Properties
- Vicat Softening Temperature:
- 115°C (ISO 306, 50°C/hr; 1 kg)
- 108°C (ISO 306, 50°C/hr; 5 kg)
- Heat Distortion Temperature:
- 86°C (ISO 75/A, 1.8 MPa, unannealed)
- 106°C (ISO 75/A, 1.8 MPa, annealed)
- Coefficient of Linear Thermal Expansion: 8.4×10−58.4 \times 10^{-5} (ISO 11359)
Flammability
UL-94 Flammability Rating: HB (1.5mm)
Mold Shrinkage
Mold Shrinkage: 0.3%–0.6% (ISO 294-4)
Process Guide
- Pre-drying Conditions: 90–95°C for 3 hrs (depending on humidity, reground resin ratio, and storage conditions)
- Barrel Temperature Profile:
- Max: 250°C, 250°C, 240°C
- Min: 230°C, 230°C, 220°C
- Mold Temperature: 30–70°C (depending on part thickness, dimensions, and gate/runner system)
- Injection Pressure: 50–70 kg/cm²
- Holding Pressure: 40–60 kg/cm²
- Back Pressure: 5–15 kg/cm²
Features & Benefits
Exceptional Heat Resistance
With a Vicat softening temperature of 115°C and heat deflection up to 106°C, POLYLAC PA-77NB withstands high-temperature environments, preventing warping in automotive dashboards or under-hood components.
Low VOC & Odor
Ideal for enclosed spaces like car interiors, this High Heat ABS minimizes harmful emissions and odors, meeting strict automotive and electronics industry standards for air quality.
Robust Mechanical Performance
A tensile strength of 45 MPa and impact resistance of 23 KJ/m² ensure durability for snap-fit parts, housings, and structural components exposed to stress or vibration.
Use & Applications
- Automotive Interiors: Dashboard panels, trim components, air vents.
- Electronics: Housing for routers, power tools, and heat-sensitive devices.
- Consumer Goods: Appliances requiring low gloss and high dimensional stability.
