Technical datasheet

Makroblend® M4000 FR

Supplied byCovestro- Last Updated on Sep 23, 2025

Makroblend® M4000 FR by Covestro is a flame retardant, biocompatible polycarbonate (PC) & polybutylene terephthalate (PBT) blend. Exhibits high toughness, modulus, excellent flow and high.
  • Provides reduced susceptibility to stress cracking.
  • Recommended for electronic medical devices.
  • Makroblend® M4000 FR complies with ISO 10993-5 (cytotoxicity), ISO 10993-10 (irritation & sensitization) and UL 94 V0 & 5VA flame rating.
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Compliance

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Makroblend® M4000 FR properties

Electrical properties

PropertiesValue & unitTest conditionTest method
Comparative Tracking Index (CTI)0.0 Visible After LoginVisible After LoginVisible After Login
Dielectric Strength0.0 Visible After LoginVisible After LoginVisible After Login
Dissipation Factor0.0 Visible After LoginVisible After LoginVisible After Login
Dissipation Factor0.0 Visible After LoginVisible After LoginVisible After Login
Surface Resistivity0.0 Visible After LoginVisible After LoginVisible After Login
Volume Resistivity0.0 Visible After LoginVisible After LoginVisible After Login

Flammability properties

PropertiesValue & unitTest conditionTest method
Flame Rating, UL 940.0 Visible After LoginVisible After LoginVisible After Login
Flame Rating, UL 940.0 Visible After LoginVisible After LoginVisible After Login

Mechanical properties

PropertiesValue & unitTest conditionTest method
Flexural Modulus0.0 Visible After LoginVisible After LoginVisible After Login
Flexural Strength0.0 Visible After LoginVisible After LoginVisible After Login
Flexural Strength at 3.5% Strain0.0 Visible After LoginVisible After LoginVisible After Login
Impact Strength, Notched Izod0.0 Visible After LoginVisible After LoginVisible After Login
Impact Strength, Notched Izod0.0 Visible After LoginVisible After LoginVisible After Login
Modulus of Elasticity0.0 Visible After LoginVisible After LoginVisible After Login
Nominal Strain at Break0.0 Visible After LoginVisible After LoginVisible After Login
Yield Strain0.0 Visible After LoginVisible After LoginVisible After Login
Yield Stress0.0 Visible After LoginVisible After LoginVisible After Login

Other properties

PropertiesValue & unitTest conditionTest method
Dielectric Constant0.0 Visible After LoginVisible After LoginVisible After Login
Dielectric Constant0.0 Visible After LoginVisible After LoginVisible After Login
Hardness, Ball Indentation0.0 Visible After LoginVisible After LoginVisible After Login

Physical properties

PropertiesValue & unitTest conditionTest method
Density0.0 Visible After LoginVisible After LoginVisible After Login
Linear Mold Shrinkage, Normal0.0 Visible After LoginVisible After LoginVisible After Login
Melt Volume Flow Rate (MVR)0.0 Visible After LoginVisible After LoginVisible After Login
Viscosity, Melt0.0 Visible After LoginVisible After LoginVisible After Login
Water Absorption at Equilibrium0.0 Visible After LoginVisible After LoginVisible After Login
Water Absorption at Saturation0.0 Visible After LoginVisible After LoginVisible After Login

Thermal properties

PropertiesValue & unitTest conditionTest method
CTE, Linear, Parallel to Flow0.0 Visible After LoginVisible After LoginVisible After Login
CTE, Linear, normal to Flow0.0 Visible After LoginVisible After LoginVisible After Login
Deflection Temperature at 0.46 MPa (66 psi)0.0 Visible After LoginVisible After LoginVisible After Login
Deflection Temperature at 1.80 MPa (264 psi)0.0 Visible After LoginVisible After LoginVisible After Login
Thermal Conductivity0.0 Visible After LoginVisible After LoginVisible After Login
Vicat Softening Temperature0.0 Visible After LoginVisible After LoginVisible After Login

Makroblend® M4000 FR Processing Guidelines

Injection Molding Processing Guidelines

PropertiesValue & unitTest conditionTest method
Drying TemperatureVisible After LoginVisible After Login
Melt TemperatureVisible After LoginVisible After Login
Moisture ContentVisible After LoginVisible After Login
Mold TemperatureVisible After LoginVisible After Login

Injection molding Processing Guidelines

PropertiesValue & unitTest conditionTest method
Back PressureVisible After LoginVisible After Login
Barrel Front TemperatureVisible After LoginVisible After Login
Barrel Middle TemperatureVisible After LoginVisible After Login
Barrel Nozzle TemperatureVisible After LoginVisible After Login
Barrel Rear TemperatureVisible After LoginVisible After Login
Drying TimeVisible After LoginVisible After Login
Hold PressureVisible After LoginVisible After Login
Screw SpeedVisible After LoginVisible After Login
Shot-to-Cylinder SizeVisible After LoginVisible After Login
Vent DepthVisible After LoginVisible After Login

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