Overthick Mica plate

Product introduction

Pamica 5761 series of silicone-bonded thick mica plates are plate-shaped high-performance thermal and electrical insulation materials made from exceptional high-grade Pamica® Muscovite mica paper or Phlogopite mica paper, bonded with special silicone resin.

They are the ideal alternative for asbestos insulations. Good resistance to high temperatures & chemicals, low heat conductivity, high dielectric strength and good high-voltage proof performance allows usage in a variety of applications in the electro-mechanical sector (railway, industry, arch chambers), as well as in the thermos-mechanical sector (hot presses, glass industry, steel works, aluminum production, induction furnaces, military, gas distribution).

    Pamica® Mica sheet


    Products Type Thickness Standard Size Remark
    Rigid Mica sheets PB5662 0.3-1.5MM 1000x2400MM Suitable for corrugated mica part,small punched mica part,high strength framework of heater.
    Flexible Mica sheet PB5161 0.08-6MM 1000*2400MM Suitable to winding or wrapping, No recovery.
    Overthick Mica plate PB5761 2-100MM 1000*2400MM High dielectric strength, suitable for machined mica parts with drilling,milling and turning.
    Mica Commutator Sheet PB5531 0.15-2.0MM 1000*1200MM Insulation between copper segment of commutators

    Four different grades available:

    PB5761:It has the highest resistance to pressure and is the recommended for complicated cut pieces.
    PJ5761: The resistance to pressure of Phlogopite mica is less than Muscovite mica, and the outstanding high temperature resistance of phlogopite mica is better than Muscovite mica. It can be applied for continuous applications > 700 °C.
    PB5761-L: Our Muscovite degassed grade has low fume emissions during first application at temperatures >250°C, (available in thickness 2.0- 10 mm).
    PJ5761-L: Our Phlogopite degassed grade has low fume emissions, during first application at temperature >250 °C.
     

    Supply Availability

    Max Thickness: 105 mm
    (tolerances 2-5mm +/- 7%, 6-30mm +/- 5%, 31-80mm +/- 3%)
    Standard size: 1000 X 600mm,1000 X 1200mm
    Untrimmed size: 1016 X 1220 or 2420mm
    Max size: 1000 X 2400mm.
    Customized strips or parts according to customers’ drawings and/or requirements under punching, drilling, milling, die-cutting or machining process.
     

    Properties

    Outstanding high temperature resistance
    Excellent electric properties
    Good mechanical strength
    Anti corrosion
    Non-toxic
    Replacement of asbestos
    Great machining performance

    Technical Date


    Type PB5761 PJ5761 PB5761-L PJ5761-L Test Standard
    Mica content % ≥88 ≥88 ≥88 ≥88 -
    Bond content % ≤12 ≤12 ≤12 ≤12 -
    Density g/cm3 2.0-2.35 2.0-2.35 2.0-2.35 2.0-2.35 -
    Heat resistance Continuous ℃ 500 800 500 700 IEC371-2
    Intermittent ℃ 700 1000 700 900 -
    Heat loss at 500 ℃ % <1 <1 <1 <1 -
    at 700 ℃ % <2 <2 <2 <2 -
    Water absorption 24h/23 ℃ % <0.5 <0.5 <0.5 <0.5 -
    Fire resistance classification 94V-0 94V-0 94V-0 94V-0 94V-0
    Dielectric strength Kv/mm 20 ℃ Kv/mm >20 >20 >20 >20 IEC243
    400 ℃ 1hour,tested at 20℃ kV/mm 13 13 13 13 IEC243
    600 ℃ 1hour,tested at 20℃ kV/mm 10 10 10 10 IEC243
    Volume resistivity 20 ℃ ohm.cm 1016 1016 1016 1016 IEC93
    400 ℃ ohm.cm 1012 1012 1012 1012 -
    500 ℃ ohm.cm 109 109 109 109 -