Keratherm KL90 and KL91

Keratherm® KL 90 and KL 91 are thermal conducting, electrical isolating double sided adhesive films. They have an excellent, permanent adhesive strength with high thermal conductivities and at the same time very good insulation characteristics.

Low thermal contact resistances can be achieved with a very reliable adhesive strength on different surfaces. There are no mechanical fixation with clips, screws or rivets needed.

Due to the soft surface finish tolerances can be compensated very good. Light weight, easy handling and high elasticity are further advantages.

Possible Thickness: 0.30mm

Applications

  • CPU’s, LED’s
  • Flip Chips, DSP’s
  • BGA’s, PPGA’s
  • MOSFET’s on heat sinks

Examples:

  • power supplies and inverter modules
  • computers
  • telecommunication electronics
  • automotive electronics
  • Property Symbol Unit KL 90 KL 91
    Color black black
    Adhesive acrylic acrylic
    Reinforcement (fiberglass) without with
    Thermal Properties
    Thermal Resistance Rth K/W 0.52 0.55
    Thermal Impedance Rti °Cmm²/W
    Kin²/W
    208
    0.32
    220
    0.34
    Thermal Conductivity ? W/mK 1.4 1.35
    Electrical Properties
    Breakdown Voltage Ud;ac kV 6.0 6.0
    Dielectric Breakdown Ed;ac kV/mm 20.0 20.0
    Volume Resistivity Ocm 2.6×104 2.6×104
    Dielectric Loss Factor tan d 1 30.5×10-2 30.5×10-2
    Dielectric Constant er 1 18.5 18.5
    Mechanical Properties
    Measured Thickness mm 0.300 0.300
    Density ? g/cm³ 1.98 1.87
    Hardness Shore A 45 59
    Tensile Strength N/mm² 0.25 11.28
    TML Ma.% 0.15 0.15
    Flame Rating UL 94V-0 94V-0
  • Specific Film Characteristics Unit KL 90 KL 91
    Reinforcement (fiberglass) without with
    Application (pressure/time) N/cm2/sec 10/10 10/15
    Tensile Shear Strength
    [25mmx25mm-adhesive area-180°
    aluminum – adhesive film – aluminum]
    N/cm2
    [DIN EN 1645]
    >30 >25
    Tensile Shear Strength
    temperature-depending **
    [25mmx25mm-adhesive area-180°
    aluminum – adhesive film – aluminum]
    -20°C
    +20°C
    +60°C
    +70°C
    +80°C
    N/cm2
    [DIN EN 1645]
    157.2
    51.7
    14.1
    12.0
    10.7
    146.8
    50.3
    13.6
    10.7
    9.5
    Adhesion* (bonding strength) N/mm >1.2 >1.0
    Tack* (surface adhesiveness) mm >1.5 >1.2
    Peel Strength (90° on aluminum) N/25mm 3 [adhesive] 9 [adhesive]
    Application Temperature (continuous) °C -40 to +125 -40 to +125
    Overall Thickness (±10%) mm 0.300 0.300
    Shelf Life months 12 12
      * – used measurement – Texture Analyser (TA.XT-plus)
    ** – according to test standard DIN EN 1645; test speed 0,5 inch/min;
    adhesion area of 25×25 mm² (1inch²);
    glued on an AlCuMg1-substrate, stored at room temperature for 62 hours.
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