MUSCOVITE VS PHLOGOPITE MICA SHEETS - KEY DIFFERENCES

Material Type

Potassium   aluminum silicate

Potassium   magnesium aluminum silicate

Max Continuous   Temp

~500–600 ℃

~800–1000 ℃

Max Peak Temp

~700 ℃

~1000 ℃

Dielectric   Strength

Higher   relative

Very good

Primary   Advantage

Electrical   insulation performance

Thermal   resistance at elevated temperatures

Best-Fit Uses

Electrical   components & moderate heat insulation

Extreme heat   insulation & thermal barriers

Mica   Content: (IEC 60371-2)

85 – 90 %

85 – 90 %

Silicone   Binder Content: (IEC 60371-2)

10 – 15 %

10 – 15 %

Density:   (IEC 60371-2)

2,2 – 2,3   g/cm³

2,2 – 2,3   g/cm³

Heat   Resistance:

In   Continuous Service: 500 °C In Intermittent Service: 800 °C

In   Continuous Service: 700 °C In Intermittent Service: 1.000 °C

Tensile   Strength: (ISO 527)

150 N/mm²

110 N/mm²

Bending   Strength: (ISO 178)

230 N/mm²

170 N/mm²

Water   Absorption:

<1 %   (24h/23°C)

<1 %   (24h/23°C)

Dielectric   Strength: (IEC 60243)

at 20°C: 25   KV/mm at 400°C: 13 KV/mm at 600°C: 10 KV/mm

at 20°C: 25   KV/mm at 400°C: 13 KV/mm at 600°C: 10 KV/mm

Volume Resistivity:   (IEC 60093)

at 20°C:   >1016 Ω/cm >1016 Ω/cm at 400°C: >1012 Ω/cm >1012 Ω/cm at 500°C:   >109 Ω/cm >109 Ω/cm

at 20°C:   >1016 Ω/cm at 400°C: >1012 Ω/cm at 500°C: >109 Ω/cm

Weight Loss   Continuous: (IEC 60371-2)

at 500°C:   <1 %

at 500°C:   <1 % at 700°C: <2 %

Thermal   Conductivity:

Perpendicular   to Plane of the Plate: 0,3 W/mK 0,3 W/mK Along the Plane of the Plate: 3,0   W/mK 3,0 W/mK

Perpendicular   to Plane of the Plate: 0,3 W/mK Along the Plane of the Plate: 3,0 W/mK

Thermal   Expansion:

Perpendicular:   100 x 10-6 /°K Parallel: 10 x 10-6 /°K

Perpendicular:   100 x 10-6 /°K Parallel: 10 x 10-6 /°K