Covestro

Makrolon 6557 550115 Clear

Makrolon 6557 550115 Clear is a flame-retardant (UL94 V-0 at 3.0 mm), medium-viscosity Polycarbonate (PC) grade (clear, colour/batch 550115). UV stabilized with easy release.
Key properties: Density 1.20 g/cm³ | MVR 10 cm³/10 min @ 300°C/1.2 kg | Oxygen index 36% | Vicat 143°C.
GradeMakrolon 6557 550115 Clear
MaterialPC
ColorClear (550115)
MFI10 cm³/10 min (MVR @ 300°C/1.2 kg)
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Material Snapshot

Grade
Makrolon 6557 550115 Clear
Material Type
PC
Manufacturer
Covestro
Brand
Makrolon
Color
Clear (550115)
Density
1.20 g/cm³
MFI
10 cm³/10 min (MVR @ 300°C/1.2 kg)
Supply Form
Granules

Applications

  • Electrical & electronic enclosures requiring flame retardancy
  • EV battery components and connectors
  • Power supply, charger and adapter housings
  • Switchgear and circuit-breaker parts
  • Appliance housings needing UL94 V-0
  • LED luminaire bodies with flame-retardant requirements
  • Office and IT equipment housings

Key Features

  • Flame retardant — UL94 V-0 at 3.0 mm
  • High oxygen index (36%)
  • Medium viscosity (MVR 10 cm³/10 min)
  • UV stabilized
  • Easy mould release
  • High impact strength (Charpy notched 70 kJ/m²)
  • Heat resistant (Vicat 143°C)

Mechanical Properties

Impact Strength
Izod Notched: 65 kJ/m²
Tensile Strength
66 MPa
Tensile Modulus
2400 MPa
Flexural Strength
99 MPa
Flexural Modulus
2400 MPa

Thermal & Processing

Heat Deflection Temperature
124°C at 1.80 MPa; 136°C at 0.45 MPa
Vicat Softening Temperature
143°C (50 N)
Melt Temperature Range
Melt: 280 - 320°C / Mold: 80 - 120°C
Drying Conditions
120°C / 2 - 3 hr
Processing Temp
Melt: 280 - 320°C / Mold: 80 - 120°C

Performance Properties

Electrical Properties
Dielectric Strength: 34 kV/mm
Volume Resistivity: 1E14 Ohm·m
Optical Properties
Light transmittance 89% (2 mm); Refractive index 1.586
Flammability Rating
V-2
Water Absorption
0.30% (saturation); 0.12% (equilibrium)
Mold Shrinkage
0.6 - 0.8%

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