Covestro Makrolon® 6457 PC Resin
Makrolon 6457 Medium Viscosity Transparent UV
Covestro Makrolon 6457 is a flame-retardant, medium-viscosity polycarbonate resin offering UL 94V-0 compliance (3.0 mm), UV stability, easy mold release, and 12 cm³/10 min flowability. Ideal for injection molding (280–320°C), it’s available in transparent/opaque hues for demanding technical applications.
Plastic Granules
Typical property data
Physical Properties (Rheological)
- Melt volume-flow rate: 12 cm³/10 min (300 °C/1.2 kg, ISO 1133)
- Melt mass-flow rate: 12.5 g/10 min (300 °C/1.2 kg, ISO 1133)
- Molding shrinkage, parallel: 0.65% (60x60x2 mm³, 500 bar, ISO 294-4)
- Molding shrinkage, normal: 0.7% (60x60x2 mm³, 500 bar, ISO 294-4)
Mechanical Properties (23 °C/50 % r. h.)
- Tensile modulus: 2450 MPa (1 mm/min, ISO 527-1,-2)
- Yield stress: 67 MPa (50 mm/min, ISO 527-1,-2)
- Yield strain: 6.1% (50 mm/min, ISO 527-1,-2)
- Nominal strain at break: >50% (50 mm/min, ISO 527-1,-2)
- Flexural modulus: 2400 MPa (2 mm/min, ISO 178)
- Flexural strength: 99 MPa (2 mm/min, ISO 178)
- Charpy notched impact strength (23 °C, 3 mm): 70 kJ/m² (ISO 21305/based on ISO 179/1eA)
- Charpy notched impact strength (-30 °C, 3 mm): 14 kJ/m² (ISO 21305/based on ISO 179/1eA)
- Puncture impact maximum force (23 °C): 5400 N (ISO 6603-2)
- Puncture impact maximum force (-30 °C): 6300 N (ISO 6603-2)
Thermal Properties
- Glass transition temperature: 144 °C (10 °C/min, ISO 11357-1,-2)
- Temperature of deflection under load (1.80 MPa): 123 °C (ISO 75-1,-2)
- Temperature of deflection under load (0.45 MPa): 135 °C (ISO 75-1,-2)
- Vicat softening temperature: 142 °C (50 N, 50 °C/h, ISO 306)
- Burning behavior UL 94 (3.0 mm): V-0 Class (UL 94)
- Oxygen index: 35% (Method A, ISO 4589-2)
Electrical Properties (23 °C/50 % r. h.)
- Relative permittivity (100 Hz): 3.1 (IEC 60250)
- Relative permittivity (1 MHz): 3.0 (IEC 60250)
- Electrical strength: 34 kV/mm (1 mm, IEC 60243-1)
Other Properties (23 °C)
- Density: 1200 kg/m³ (ISO 1183-1)
- Water absorption (saturation value): 0.30% (Water at 23 °C, ISO 62)
- Water absorption (equilibrium value): 0.12% (23 °C; 50 % r. h., ISO 62)
Processing and Drying Conditions
- Melt temperature: 280-320 °C (Recommended)
- Mold temperature: 80-120 °C (Recommended)
- Dry air drying temperature: 120 °C
- Dry air drying time: 2-3 hours
- Moisture content (max.): ≤0.02%
Features & Benefits
Safety-Compliant Flame Resistance
It achieves UL 94V-0 rating at 3.0 mm thickness, enabling use in electrical/electronic components without secondary fireproofing. Reduces compliance costs and simplifies design.
Optical Clarity + Durability
It boasts 89% light transmission (1–2 mm) with UV stabilization, resisting yellowing in outdoor/light-exposed settings. Ideal for transparent covers, lenses, and displays.
Optimized Processing Efficiency
Medium viscosity (12 cm³/10 min MVR) and easy-release additives ensure fast cycle times and minimal mold fouling. Lowers production downtime and maintenance costs.
Use & Applications
- Electrical Safety: Circuit breakers, switch housings (UL V-0 compliance).
- Transparent Enclosures: Meter covers, LED diffusers (UV stability + clarity).
- Industrial Components: Flame-retardant connectors, tool housings.
- Transportation: Interior panels, lighting components (FMVSS burn rate passed).
Makrolon® 6457 Related Flame Retardant Grades
Disclaimer: Grades below are potential alternatives for comparison only. Not direct drop-in replacements. Typical values from Covestro ISO TDS; verify UL94 colors/thickness on current UL Yellow Card. RoHS/REACH/halogen/PFAS status not confirmed unless report provided.
| Grade | Positioning | UL94 (ISO TDS) | MVR | HDT (1.80 MPa) | Notched Impact (23°C/3mm) | Color | UV / UL 746C f1 |
|---|---|---|---|---|---|---|---|
| 6455 | Medium viscosity; transparent | V-2 @1.5mm; V-0 @3.0mm | 12 cm³/10min | 124°C | Charpy 70P; Izod 65P | T/T/O | No / N/A |
| 6557 | Medium viscosity; UV; transparent | V-2 @1.5mm; V-0 @3.0mm | 10 cm³/10min | 124°C | Charpy 70P(C); Izod 65P | T/T/O | Yes / N/A |
| 6487 | Medium viscosity; 5VA; UV; opaque | V-0 @1.5mm; 5VA @3.0mm | 9.0 cm³/10min | 122°C | Charpy 70P(C); Izod 70P(C) | Opaque | Yes / N/A |
| 2467 | Low viscosity; UV; transparent | V-2 @0.75mm; V-0 @6.4mm | 19 cm³/10min | 124°C | Charpy 65P(C); Izod 60P | T/T/O | Yes / N/A |
👉 Full Portfolio: Browse all 27+ grades on the Covestro Flame Retardant PC Resin Hub.