Covestro Makrolon® 2258 PC Resin
Plastic Granules
Makrolon 2258 PC Resin Medical Grade
Makrolon 2258 is a medical-grade polycarbonate resin designed for precision medical components. With low viscosity (34 cm³/10 min MVR), easy mold release, and ISO 10993-1 biocompatibility, it excels in steam/ETO sterilization at 121°C. Available in transparent/opaque colors for versatile device design.
Associated Documents
ISO TDS
Typical property data
Physical Properties (Rheological)
- Melt Volume-Flow Rate (MVR): 34 cm³/10 min (ISO 1133, 300 °C/1.2 kg)
- Melt Mass-Flow Rate (MFR): 37 g/10 min (ISO 1133, 300 °C/1.2 kg)
- Molding Shrinkage (Parallel): 0.65% (ISO 294-4, 60x60x2 mm³/500 bar)
- Molding Shrinkage (Normal): 0.65% (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: 65 MPa (ISO 527-1, -2, 50 mm/min)
- Yield Strain: 6.0% (ISO 527-1, -2, 50 mm/min)
- Nominal Strain at Break: >50% (ISO 527-1, -2, 50 mm/min)
- Tensile Creep Modulus (1h): 2100 MPa (ISO 899-1)
- Tensile Creep Modulus (1000h): 1700 MPa (ISO 899-1)
- Flexural Modulus: 2350 MPa (ISO 178, 2 mm/min)
- Flexural Strength: 97 MPa (ISO 178, 2 mm/min)
- Charpy Notched Impact Strength (23 °C/3 mm): 55 kJ/m² (ISO 21305/ISO 179/1eA)
- Charpy Notched Impact Strength (-30 °C/3 mm): 12 kJ/m² (ISO 21305/ISO 179/1eA)
- Puncture Impact Max Force (23 °C): 4900 N (ISO 6603-2)
- Puncture Energy (23 °C): 55 J (ISO 6603-2)
Thermal Properties
- Glass Transition Temperature: 145 °C (ISO 11357-1, -2, 10 °C/min)
- Deflection Temperature Under Load (1.8 MPa): 124 °C (ISO 75-1, -2)
- Deflection Temperature Under Load (0.45 MPa): 137 °C (ISO 75-1, -2)
- Vicat Softening Temperature (50 N, 50 °C/h): 145 °C (ISO 306)
- Thermal Conductivity (Through-plane, 23 °C/50% r. h.): 0.20 W/(m·K) (ISO 8302)
- Burning Behavior (UL 94, 0.75 mm): V-2 (UL 94)
- Burning Behavior (UL 94, 2.9 mm): HB (UL 94)
Electrical Properties (23 °C/50% r. h.)
- Relative Permittivity (100 Hz): 3.1 (IEC 60250)
- Relative Permittivity (1 MHz): 3.0 (IEC 60250)
- Dissipation Factor (100 Hz): 0.0005 (IEC 60250)
- Dissipation Factor (1 MHz): 0.009 (IEC 60250)
- Volume Resistivity: 1 × 10¹⁴ Ω·m (IEC 62631-3-1)
- Surface Resistivity: 1 × 10¹⁶ Ω (IEC 62631-3-2)
- Electrical Strength: 34 kV/mm (IEC 60243-1)
- Comparative Tracking Index (CTI): 250 (IEC 60112)
Other Properties (23 °C)
- Density: 1200 kg/m³ (ISO 1183-1)
- Water Absorption (Saturation): 0.30% (ISO 62, Water at 23 °C)
- Water Absorption (Equilibrium, 23 °C/50% r. h.): 0.12% (ISO 62)
- Refractive Index: 1.586 (ISO 489)
- Luminous Transmittance (Clear, 2 mm): 89% (ISO 13468-2)
Processing and Drying Conditions
- Melt Temperature: 280–320 °C (ISO 294)
- Mold Temperature: 80–120 °C (ISO 294)
- Drying Temperature: 120 °C
- Drying Time: 2–3 hours
- Moisture Content (Max): ≤ 0.02%
Features & Benefits
Sterilization-Ready Medical Compliance
Makrolon® 2258 meets ISO 10993-1 biocompatibility standards and withstands repeated ETO/steam sterilization cycles (121°C), ensuring safety for surgical tools and implants without degradation.
Low Viscosity, High Efficiency
Its optimized flow (34 cm³/10 min MVR) enables easy injection molding of thin-walled parts (280–320°C melt temp), reducing cycle times and production costs for high-volume medical devices.
Optical Clarity & Durability
It delivers 89% light transmittance (1mm thickness) and impact resistance (>50 kJ/m²), ideal for transparent housings, lenses, and diagnostic equipment requiring scratch resistance and clarity.
Use & Applications
- Medical Devices: Surgical instruments, drug delivery systems, implantable components.
- Sterilization-Compatible Parts: Reusable trays, housings, connectors
- High-Clarity Components: Diagnostic equipment lenses, transparent covers, sample chambers.