Covestro Makrolon® 2558 PC Resin
Plastic Granules
Makrolon 2558 PC Resin Medical Grade
Makrolon 2558 is a medical-grade polycarbonate resin with medium viscosity (MVR 14 cm³/10 min) and easy-release properties. Biocompatible per ISO 10993-1, it withstands ETO/steam sterilization at 121°C and is available in transparent/opaque colors for versatile medical device manufacturing.
Associated Documents
ISO TDS
Typical property data
Physical Properties (Rheological)
- Melt volume-flow rate (MVR): 14 cm³/10 min (ISO 1133, 300 °C/1.2 kg)
- Melt mass-flow rate (MFR): 15.5 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): 0.7% (ISO 294-4, 60x60x2 mm³/500 bar)
- Molding shrinkage (range): 0.6–0.8% (ISO 2577, based on general experience)
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)
- Strain at break: >50% (ISO 527-1,-2, 50 mm/min)
- Tensile creep modulus (1h): 2200 MPa (ISO 899-1)
- Tensile creep modulus (1000h): 1900 MPa (ISO 899-1)
- 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/based on ISO 179/1eA)
- Izod notched impact strength (23 °C/3 mm): 65 kJ/m² (ISO 21305/based on ISO 180/A)
Thermal Properties
- Glass transition temperature: 144 °C (ISO 11357-1,-2, 10 °C/min)
- Deflection temperature under load (1.80 MPa): 124 °C (ISO 75-1,-2)
- Deflection temperature under load (0.45 MPa): 136 °C (ISO 75-1,-2)
- Vicat softening temperature (50 N; 50 °C/h): 144 °C (ISO 306)
- Coefficient of linear thermal expansion (23–55 °C): 0.65 × 10⁻⁴/K (ISO 11359-1,-2)
- Thermal conductivity (23 °C): 0.20 W/(m·K) (ISO 8302)
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)
- Volume resistivity: 1 × 10¹⁴ Ohm·m (IEC 62631-3-1)
- Surface resistivity: 1 × 10¹⁶ Ohm (IEC 62631-3-2)
- Electrical strength (1 mm): 34 kV/mm (IEC 60243-1)
Other Properties (23 °C)
- Water absorption (saturation): 0.30% (ISO 62, Water at 23 °C)
- Water absorption (equilibrium): 0.12% (ISO 62, 23 °C; 50% r.h.)
- Density: 1200 kg/m³ (ISO 1183-1)
Processing and Drying Conditions
- Injection molding melt temperature: 280–320 °C (ISO 294)
- Injection molding mold temperature: 80 °C (ISO 294)
- Drying temperature: 120 °C
- Drying time: 2–3 hours
- Moisture content (max): ≤0.02%
Features & Benefits
Biocompatible & Sterilization-Ready
Makrolon® 2558 meets ISO 10993-1 standards for bio-compatibility and endures repeated ETO/steam sterilization cycles. This ensures patient safety and reduces device replacement costs in hospitals.
Effortless Injection Molding
With medium viscosity and smooth mold release, it minimizes production delays and defects. Ideal for complex parts like surgical housings or IV connectors, cutting cycle times by 15-20%.
High Clarity & Durability
It delivers 88% light transmittance (3mm thickness) and >130% strain at break. Perfect for clear surgical instruments or impact-resistant casings that stay crack-free in cold environments (-30°C).
Use & Applications
- Medical Devices: Surgical tools, IV components, dialysis equipment.
- Sterilizable Parts: Autoclavable trays, reusable diagnostic housings.
- Injection-Molded Components: Transparent covers, connectors, and safety-critical casings.