Unsaturated polyester Reinforced with 15% Glass Fibres and 60% Mineral Powder (UP+GF15+MD60), Type 804

Alternative and trade names
Bakelite®, Melopas®
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Polyester moulding compound, inorganically filled, glass fiber reinforced, styrene free, high dimensional stability and good mechanical properties.

This material data has been provided by M-Base.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts

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1.98 - 2.28 g/cm³

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23.0 °C



Elastic modulus

11 - 13 GPa

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23.0 °C


0.6 - 1.2 %

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23.0 °C

Impact strength, Charpy notched

2.4 - 7 kJ/m²

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23.0 °C

Impact strength, Charpy unnotched

5 - 13 kJ/m²

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23.0 °C

Tensile strength

45 - 65 MPa

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23.0 °C

at 0.6-1.2% strain



Coefficient of thermal expansion

1.5E-5 - 4E-5 1/K

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23.0 °C


UL 94 V1-V0

Max service temperature, long

170 °C

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Max service temperature, short

210 °C

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Specific heat capacity

1200 J/(kg·K)

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23.0 °C

Thermal conductivity

0.6 - 0.8 W/(m·K)

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23.0 °C



Dielectric constant

3 - 7 [-]

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Electrical resistivity

1.00E+10 - 1.00E+12 Ω·m

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23.0 °C





Technological properties

Application areas

explosion proof switches, safety switch housings, oven knobs, lamp parts


15% Glass Fiber and 60% Mineral Powder

Processing methods

Injection molding, transfer molding, compression molding