Covestro Makrolon® 2658 PC Resin
Makrolon 2658 Polycarbonate Resin Medical Devices Uses
Makrolon 2658 is a medium-viscosity Covestro PC resin engineered for medical devices. Biocompatible (ISO 10993-1), it withstands ETO/steam sterilization at 121°C and offers easy mold release. Available in transparent/opaque colors—ideal for injection-molded healthcare components.
Associated Documents
ISO TDS
Typical property data
Physical Properties (Rheological)
- Melt Mass-Flow Rate (MFR): 13 g/10 min (ISO 1133, 300 °C/1.2 kg)
- Molding Shrinkage (Parallel): 0.7% (ISO 294-4, 60 × 60 × 2 mm³/500 bar)
- Molding Shrinkage (Normal): 0.75% (ISO 294-4, 60 × 60 × 2 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)
- Flexural Modulus: 2400 MPa (ISO 178, 2 mm/min)
- Flexural Strength: 97 MPa (ISO 178, 2 mm/min)
- Charpy Notched Impact Strength (23 °C): 70 kJ/m² (ISO 21305, based on ISO 179/1eA)
- Charpy Notched Impact Strength (-30 °C): 16 kJ/m² (ISO 21305, based on ISO 179/1eA)
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 (50 N, 50 °C/h): 144 °C (ISO 306)
- Burning Behavior (UL 94, 0.75 mm): V-2 (UL 94)
- Oxygen Index: 27% (ISO 4589-2)
Electrical Properties (23 °C/50 % r.h.)
- Relative Permittivity (100 Hz): 3.1 (IEC 60250)
- Volume Resistivity: 1×1014 Ω⋅m1 \times 10^{14}\, \Omega·m (IEC 62631-3-1)
- Surface Resistivity: 1×1016 Ω1 \times 10^{16}\, \Omega (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 Value): 0.30% (ISO 62, Water at 23 °C)
- Water Absorption (Equilibrium Value): 0.12% (ISO 62, 23 °C/50 % r.h.)
- Refractive Index: 1.586 (ISO 489)
- Luminous Transmittance (2 mm, Clear Transparent): 89% (ISO 13468-2)
Processing and Drying Conditions
- Melt Temperature (Injection Molding): 280–320 °C (ISO 294)
- Mold Temperature (Injection Molding): 70–110 °C (ISO 294)
- Drying Temperature (Dry Air): 120 °C
- Drying Time: 4 hours
- Moisture Content (Max): ≤ 0.02%
Features & Benefits
Medical-Grade Safety & Sterilization
Covestro PC Makrolon 2658 medical devices resin is biocompatible per ISO 10993-1 and endures repeated ETO/steam sterilization cycles at 121°C, ensuring patient safety and device longevity.
Robust Mechanical Performance
With high tensile strength (70 MPa) and impact resistance (70 kJ/m²), it prevents cracks in high-stress medical parts like surgical tools or housings during daily use.
Optical Clarity & Versatility
It achieves 89% light transmittance (1mm thickness) and offers transparent/opaque color options—perfect for diagnostic windows or aesthetic device components requiring precision.
Use & Applications
- Medical Devices: Surgical instruments, housings, connectors.
- Sterilizable Components: Trays, fluid-handling parts, diagnostic equipment.
- Injection-Molded Healthcare Items: IV components, drug-delivery systems, transparent casings.