Covestro Makrolon® 2258 RE PC Resin
Plastic Granules
Makrolon 2258 RE PC Resin
Makrolon® 2258 RE is a low-viscosity, partially bio-circular polycarbonate resin with 34 cm³/10 min MVR (300°C/1.2 kg). It offers easy mold release, biocompatibility per ISO 10993-1, and renewable content via ISCC PLUS mass balance. Ideal for transparent/opaque medical and industrial parts needing steam/ETO sterilization.
Associated Documents
ISO TDS
Typical property data
Physical Properties (Rheological)
- Melt Volume-Flow Rate (MVR): 34 cm³/10 min (300 °C / 1.2 kg, ISO 1133)
- Melt Mass-Flow Rate (MFR): 37 g/10 min (300 °C / 1.2 kg, ISO 1133)
- Molding Shrinkage (Parallel/Normal): 0.65% (ISO 294-4)
Mechanical Properties (23 °C / 50% r.h.)
- Tensile Modulus: 2400 MPa (1 mm/min, ISO 527-1/-2)
- Yield Stress: 65 MPa (50 mm/min, ISO 527-1/-2)
- Yield Strain: 6.0% (50 mm/min, ISO 527-1/-2)
- Nominal Strain at Break: >50% (50 mm/min, ISO 527-1/-2)
- Flexural Modulus: 2350 MPa (2 mm/min, ISO 178)
- Flexural Strength: 97 MPa (2 mm/min, ISO 178)
- Charpy Notched Impact Strength (23 °C): 55 kJ/m² (ISO 21305 / ISO 179/1eA)
- Charpy Notched Impact Strength (-30 °C): 12 kJ/m² (ISO 21305 / ISO 179/1eA)
Thermal Properties
- Glass Transition Temperature: 145 °C (10 °C/min, ISO 11357-1/-2)
- Deflection Temperature Under Load:
- 124 °C (1.80 MPa, ISO 75-1/-2)
- 137 °C (0.45 MPa, ISO 75-1/-2)
- Vicat Softening Temperature:
- 145 °C (50 N, 50 °C/h, ISO 306)
- 146 °C (50 N, 120 °C/h, ISO 306)
- Burning Behavior:
- UL 94 V-2 at 0.75 mm
- UL 94 HB at 2.9 mm
Electrical Properties (23 °C / 50% r.h.)
- Relative Permittivity:
- 3.1 (100 Hz, IEC 60250)
- 3.0 (1 MHz, IEC 60250)
- Dissipation Factor:
- 5.0 × 10⁻⁴ (100 Hz, IEC 60250)
- 90 × 10⁻⁴ (1 MHz, IEC 60250)
- Volume Resistivity: 101410^{14} Ohm·m (IEC 62631-3-1)
- Surface Resistivity: 101610^{16} Ohm (IEC 62631-3-2)
- Electrical Strength: 34 kV/mm (1 mm, IEC 60243-1)
- Comparative Tracking Index (CTI): 250 (Solution A, IEC 60112)
Other Properties (23 °C)
- Density: 1200 kg/m³ (ISO 1183-1)
- Water Absorption (Saturation Value): 0.30% (ISO 62)
- Water Absorption (Equilibrium Value): 0.12% (23 °C, 50% r.h., ISO 62)
Processing and Drying Conditions
- Injection Molding Melt Temperature: 280–320 °C (ISO 294)
- Injection Mold Temperature: 80–120 °C (ISO 294)
- Drying Temperature: 120 °C
- Drying Time: 2–3 hours
- Maximum Moisture Content: ≤0.02%
Features & Benefits
Sustainable & Renewable Sourcing
Covestro PC Makrolon 2258 RE uses ISCC PLUS-attributed bio-circular content, reducing carbon footprint without compromising performance – perfect for eco-driven procurement targets.
Medical-Grade Safety & Compliance
Biocompatible (ISO 10993-1) and sterilizable (121°C steam/ETO), it ensures reliability for surgical tools, lab equipment, and FDA-compliant devices.
Easy Processing & High Efficiency
Low viscosity and easy release cut cycle times by 15% in injection molding, reducing waste and energy costs for complex parts like connectors or housings.
Use & Applications
- Medical Devices: Sterilizable surgical instruments, IV connectors.
- Industrial Components: Electrical housings, automotive sensors.
- Consumer Tech: Transparent covers, wearables, and lenses.
- Packaging: Sustainable, shatter-resistant containers.