Covestro Makrolon® 2656 PC Resin
Plastic Granules
Makrolon 2656 PC particles Food contact grades
Makrolon 2656 is a medium-viscosity, food-contact-compliant polycarbonate resin. Optimized for easy release and injection molding, it’s available in transparent, translucent, and opaque colors—ideal for high-clarity, durable industrial components.
Associated Documents
ISO TDS
Typical property data
Physical Properties (Rheological)
- Melt volume-flow rate (300 °C/1.2 kg): 12 cm³/10 min (ISO 1133)
- Melt mass-flow rate (300 °C/1.2 kg): 13 g/10 min (ISO 1133)
- Molding shrinkage (parallel, 60x60x2 mm³/500 bar): 0.7% (ISO 294-4)
- Molding shrinkage (normal, 60x60x2 mm³/500 bar): 0.75% (ISO 294-4)
Mechanical Properties (23 °C/50 % r.h.)
- Tensile modulus (1 mm/min): 2400 MPa (ISO 527-1,-2)
- Yield stress (50 mm/min): 66 MPa (ISO 527-1,-2)
- Yield strain (50 mm/min): 6.1% (ISO 527-1,-2)
- Nominal strain at break (50 mm/min): >50% (ISO 527-1,-2)
- Tensile creep modulus (1 h): 2200 MPa (ISO 899-1)
- Tensile creep modulus (1000 h): 1900 MPa (ISO 899-1)
- Flexural modulus (2 mm/min): 2400 MPa (ISO 178)
- Flexural strength (2 mm/min): 97 MPa (ISO 178)
- Charpy notched impact strength (23 °C, 3 mm): 70 kJ/m² (ISO 21305/based on ISO 179/1eA)
- Charpy notched impact strength (-30 °C, 3 mm): 16 kJ/m² (ISO 21305/based on ISO 179/1eA)
Thermal Properties
- Glass transition temperature (10 °C/min): 145 °C (ISO 11357-1,-2)
- Temperature of deflection under load (1.80 MPa): 124 °C (ISO 75-1,-2)
- Temperature of deflection under load (0.45 MPa): 137 °C (ISO 75-1,-2)
- Vicat softening temperature (50 N, 50 °C/h): 143 °C (ISO 306)
- Burning behavior UL 94 (0.75 mm): Class V-2 (UL 94)
- Coefficient of linear thermal expansion (23 to 55 °C): 0.65 ×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)
- Dissipation factor (100 Hz): 5 ×10⁻⁴ (IEC 60250)
- Dissipation factor (1 MHz): 90 ×10⁻⁴ (IEC 60250)
- Volume resistivity: 1E14 Ohm·m (IEC 62631-3-1)
- Surface resistivity: 1E16 Ohm (IEC 62631-3-2)
- Electrical strength (1 mm): 34 kV/mm (IEC 60243-1)
Other Properties (23 °C)
- Water absorption (saturation value, Water at 23 °C): 0.30% (ISO 62)
- Water absorption (equilibrium value, 23 °C; 50 % r.h.): 0.12% (ISO 62)
- Density: 1200 kg/m³ (ISO 1183-1)
- Refractive index: 1.586 (ISO 489)
- Luminous transmittance (clear transparent materials, 2 mm): 89% (ISO 13468-2)
Processing and Drying Conditions
- Melt temperatures: 280 – 320 °C (Recommended: 300 °C)
- Mold temperatures: 80 – 120 °C
- Dry air drying temperature: 120 °C
- Dry air drying time: 2 – 3 hours
- Moisture content (max): ≤ 0.02%
Features & Benefits
Food-Safe & Globally Compliant
It meets stringent food-contact standards, ensuring safety for food containers, utensils, and packaging without compromising material performance.
Effortless High-Temp Processing
It flows smoothly at 280–320°C (barrel) and 80–120°C (mold), reducing cycle times and warpage for complex geometries like thin-walled housings.
Extreme Impact Resistance
It withstands harsh environments (130% elongation at break, 70 kJ/m² notched Charpy impact), preventing cracks in toddler cups, power tool housings, or automotive parts.
Use & Applications
- Food Packaging: Reusable containers, coffee machine reservoirs, and transparent lids (FDA-compliant).
- Consumer Electronics: Smartphone cases, power tool housings, and appliance components (impact + electrical safety).
- Automotive Interiors: Dashboard panels and light covers (heat resistance + optical clarity).
- Medical/Pharma: Non-implant lab equipment housings (chemical resistance + ease of sterilization).
