Covestro Makrolon® 2658 RE PC Resin
Plastic Granules
Makrolon 2658 RE PC Resin
Makrolon® 2658 RE by Covestro is a bio-circular polycarbonate resin (attributed via ISCC PLUS mass balance). With medium viscosity (12 cm³/10 min MVR), it offers easy mold release, biocompatibility per ISO 10993-1, and suitability for steam/ETO sterilization. Available in transparent/opaque colors.
Associated Documents
ISO TDS
Typical property data
Physical Properties (Rheological)
- Melt Volume-Flow Rate (MVR): 12 cm³/10 min (ISO 1133, 300 °C/1.2 kg)
- Melt Mass-Flow Rate (MFR): 13 g/10 min (ISO 1133, 300 °C/1.2 kg)
- Molding Shrinkage (Parallel): 0.7% (ISO 294-4, 60x60x2 mm³/500 bar)
- Molding Shrinkage (Normal): 0.75% (ISO 294-4, 60x60x2 mm³/500 bar)
Mechanical Properties (23 °C/50% r.h.)
- Tensile Modulus: 2400 MPa (ISO 527-1, -2, 1 mm/min)
- Yield Stress: 66 MPa (ISO 527-1, -2, 50 mm/min)
- Yield Strain: 6.1% (ISO 527-1, -2, 50 mm/min)
- Nominal Strain at Break: >50% (ISO 527-1, -2, 50 mm/min)
- Stress at Break: 70 MPa (ISO 527-1, -2, 50 mm/min)
- Flexural Modulus: 2400 MPa (ISO 178, 2 mm/min)
- Flexural Strength: 97 MPa (ISO 178, 2 mm/min)
- Charpy Notched Impact Strength (23 °C, 3 mm): 70 kJ/m² (ISO 21305/ISO 179/1eA)
- Izod Notched Impact Strength (23 °C, 3 mm): 70 kJ/m² (ISO 21305/ISO 180/A)
Thermal Properties
- Glass Transition Temperature: 145 °C (ISO 11357-1, -2, 10 °C/min)
- Temperature of Deflection Under Load (1.80 MPa): 124 °C (ISO 75-1, -2)
- Vicat Softening Temperature: 144 °C (ISO 306, 50 N; 50 °C/h)
- Burning Behavior (UL 94, 0.75 mm): V-2 (UL 94)
- Coefficient of Linear Thermal Expansion (23–55 °C): 0.65 x 10⁻⁴/K (ISO 11359-1, -2)
Electrical Properties (23 °C/50% r.h.)
- Relative Permittivity (100 Hz): 3.1 (IEC 60250)
- Relative Permittivity (1 MHz): 3.0 (IEC 60250)
- Volume Resistivity: 1×10141 \times 10^{14} Ω·m (IEC 62631-3-1)
- Surface Resistivity: 1×10161 \times 10^{16} Ω (IEC 62631-3-2)
- Electrical Strength: 34 kV/mm (IEC 60243-1, 1 mm)
Other Properties (23 °C)
- Water Absorption (Saturation Value): 0.30% (ISO 62, Water at 23 °C)
- Density: 1200 kg/m³ (ISO 1183-1)
- Refractive Index: 1.586 (ISO 489)
- Luminous Transmittance (Clear Transparent, 2 mm): 89% (ISO 13468-2)
Processing and Drying Conditions
- Melt Temperature (Range): 280–320 °C (ISO 294)
- Standard Melt Temperature: 300 °C (ISO 294)
- Mold Temperature (Range): 70–110 °C (ISO 294)
- Dry Air Drying Temperature: 120 °C
- Dry Air Drying Time: 4 hours
- Moisture Content (Max): ≤0.02%
Features & Benefits
Sustainable & ISCC-Certified
It contains bio-attributed content via mass balance, reducing carbon footprint while matching virgin PC performance. Ideal for eco-conscious procurement teams.
Medical-Grade Sterilization
It withstands 121°C steam/ETO sterilization cycles, ensuring compliance for reusable surgical tools, housings, and lab equipment without degradation.
Optimized Processing Ease
Medium flow rate (12 cm³/10 min) and easy-release properties reduce cycle times and ejection failures—saving costs in high-volume molding.
Use & Applications
- Injection-Molded Medical Devices: Surgical instrument handles, transparent housings.
- Sterilizable Equipment: Autoclavable trays, connectors, and fluid reservoirs.
- Industrial Components: Electrical insulators, safety visors, and automotive lenses.