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    graphite soft felt

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    • 商品说明
    Product Description
    Graphite Soft Felt
    Graphite soft felt (also called flexible graphite felt) is a flexible, high-temperature insulation material.
    I. Thermal Insulation for High-Temperature Furnaces (Primary Application)
    This is the largest application area for graphite soft felt, where it serves as the insulation layer, heat shield, and furnace lining in vacuum or inert-atmosphere furnaces:
    · Crystal growth furnaces: heat shields and hot-zone components for Czochralski (CZ) monocrystalline silicon pullers, multicrystalline silicon ingot furnaces, silicon carbide crystal growth furnaces, and sapphire / synthetic crystal furnaces 
    · Vacuum and atmosphere furnaces: vacuum sintering furnaces, vacuum high-pressure gas quenching furnaces, heat treatment furnaces, brazing furnaces, annealing furnaces, graphitization furnaces, and induction furnaces 
    · Photovoltaic and semiconductor equipment: insulation for high-temperature processes in epitaxy furnaces, diffusion furnaces, and similar tools 
    It is worth noting that soft felt delivers markedly better insulation efficiency than rigid felt — at equal thickness, heat loss is lower (at 1150 °C, thermal conductivity is about 0.14 W/m·K for soft felt versus roughly 0.25 W/m·K for rigid felt, an overall insulation performance improvement of up to 44%). In addition, its flexibility allows it to accommodate thermal expansion, and localized damage can be repaired simply by cutting out and replacing the affected section, keeping maintenance costs low.
    Specification
    Item
    Unit
    Typical Range
    Bulk Density
    g/cm3
    0.06–0.16
    Thickness
    mm
    3 / 5 / 6 / 8 / 10 / 12 / 12.7
    Grammage / Basis Weight
    g/m2
    500–1350
    Width
    mm
    1000 / 1200 / 1350 / 1400 / 1600
    Length
    m
    10–100 (in roll form)
    Carbon Content
    %
    ≥99 (≥95 for carbonized felt)
    Ash Content (unpurified)
    ppm
    ≤200–800
    Ash Content (purified)
    ppm
    ≤20; high-end ≤5
    Sulfur Content
    ppm
    ≤200; ≤5 for purified grades
    Thermal Conductivity
    W/(m·K)
    RT 0.03–0.08; @1000°C 0.10–0.25; @1500°C 0.20–0.38
    Tensile Strength
    MPa
    0.10–0.30
    Breaking Strength
    MPa
    ≥0.2–0.3
    Heat Treatment Temperature
    °C
    1200 (carbonized) / 2000–2600 (graphitized)
    Max. Service Temperature
    °C
    2200–3000 in vacuum/inert; only 350 in air
    Specific Surface Area
    m2/g
    3–7
    Fiber Shedding Rate
    %
    ≤0.3
    Products Pictures
    Factory Direct Graphite Soft Felt for Vacuum Furnace Hot Zone Insulation
    Factory Direct Graphite Soft Felt for Vacuum Furnace Hot Zone Insulation
    Factory Direct Graphite Soft Felt for Vacuum Furnace Hot Zone Insulation
    Factory Direct Graphite Soft Felt for Vacuum Furnace Hot Zone Insulation
    Factory Direct Graphite Soft Felt for Vacuum Furnace Hot Zone Insulation
    Factory Direct Graphite Soft Felt for Vacuum Furnace Hot Zone Insulation


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