3M™ Dyneon™ TFM™ (Modified PTFE Granules TFM 1635)

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Modified semi-free-flowing suspension PTFE of the 2nd generation for moulding applications like diaphragms, bellows, shaped parts and skived films.

Special Features are:

  • Meets ASTM D 4894 - Type IV, Grade 2 classification
  • Produced by suspension polymerisation
  • Homogenous mould filling and reduced moulding pressure
  • Substantially lower deformation under load (“cold flow”)
  • Improved particle coalescence
  • Better surface finish
  • Dense polymer structure with very low void content
  • Low permeability
  • Good weldability
  • Improved flex life
  • Good electrical and mechanical properties Excellent chemical resistance
  • Low friction behaviour
  • Good flame retardance
  • Exceptional temperature resistance

  • Typical Properties:

    PTFE moulding powder with semi-free-flowing properties and high bulk density is the preferred grade for shaped parts requiring improved flexlife properties, a denser polymer structure, significantly lower deformation under load and very good mechanical properties.

    This material data has been provided by Matmatch.

    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.

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    Bulk density

    23.0 °C

    0.83 g/cm³

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    DIN EN ISO 60


    23.0 °C

    2.16 g/cm³

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    DIN EN ISO 12086

    Particle size

    230000 nm

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    ISO 13320, average value



    Elastic modulus

    23.0 °C

    0.65 GPa

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    DIN EN ISO 527


    23.0 °C

    600 %

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    DIN EN ISO 527-3, 0.2 mm film

    Hardness, Shore D

    23.0 °C

    59 [-]

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    DIN EN ISO 868

    Tensile strength

    23.0 °C

    35 MPa

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    DIN EN ISO 527-3, 0.2 mm film



    Coefficient of thermal expansion

    100.0 °C

    1.2E-4 1/K

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    DIN 53 752, from 30°C to the mentioned temperature

    200.0 °C

    1.4E-4 1/K

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    DIN 53 752, from 30°C to the mentioned temperature

    260.0 °C

    1.7E-4 1/K

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    DIN 53 752, from 30°C to the mentioned temperature

    Thermal conductivity

    23.0 °C

    0.22 W/(m·K)

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    DIN 52612



    Dielectric strength

    23.0 °C

    78 kV/mm

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    DIN EN ISO 12086, 0.2 mm film

    Electrical resistivity

    23.0 °C

    1.00E+16 Ω·m

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    IEC 60093

    Surface resistivity

    23.0 °C

    1.00E+17 Ω/sq

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    IEC 60093

    Rheological Properties



    23.0 °C

    4.1 %

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    Internal Dyneon method, Cylinder 45 mm diameter

    Technological properties

    Application areas

    3M™ Dyneon™ TFM™ Modified PTFE Granules TFM 1635 is especially suitable for the manufacturing of shaped parts and large cylinders,forskivedfilms of >250 μm(e.g. aslinings in the chemical processing industry (CPI)), articles requiring improved flexlife properties (diaphragms, bellows etc.), large compression moulded sheets and isostatically moulded articles.