Keratherm KL90, KL91 & KL95 - MH&W Thermal Products

Keratherm® KL 90, KL 91 and KL 95 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 Thicknesses: 0.18 – 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 KL 95
    Color     black black grey
    Adhesive     acrylic acrylic acrylic
    Reinforcement (fiberglass)     without with without
    Thermal Properties
    Thermal Resistance Rth K/W 0.52 0.55 0.32
    Thermal Impedance Rti °Cmm²/W
    Kin²/W
    208
    0.32
    220
    0.34
     
    Thermal Conductivity λ W/mK 1.4 1.35 1.3
    Electrical Properties
    Breakdown Voltage Ud;ac kV 6.0 6.0 2.0
    Dielectric Breakdown Ed;ac kV/mm 20.0 20.0 10.0
    Volume Resistivity   Ωcm 2.6×104 2.6×104 2.4×1011
    Dielectric Loss Factor tan δ   3.1×10-1 3.1×10-1 2.4×10-1
    Dielectric Constant εr   18.5 18.5 1.7
    Mechanical Properties
    Measured Thickness   mm 0.300 0.300 0.180
    Density   g/cm³ 1.98 1.87 2.24
    Hardness   Shore A 45 59 60
    Tensile Strength   N/mm² 0.3 11.3 <6.5
    TML   Ma.% <0.15 <0.15  
    Flame Rating   UL 94V-0 94V-0  
  • Specific Film Characteristics   Unit KL 90 KL 91 KL 95
    Reinforcement (fiberglass)     without with without
    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
     
    Tensile Shear Strength
    [after vibration test (sinusoidal at 60ºC)
    10-500 Hz, 50s/m2 (5g)
    24h test cycle (8h per axis)]
      N/cm2
    [DIN EN 60068-2-2/6]
    31.5 32.5  
    Tensile Shear Strength
    [after vibration test (sinusoidal at RT)
    10-500 Hz, 100s/m2 (10g)
    24h test cycle (8h per axis)]
      N/cm2
    [DIN EN 60068-2-2/6]
    32.1 35.9  
    Adhesion* (bonding strength)   N/mm >1.2 >1.0 >0.5
    Tack* (surface adhesiveness)   mm >1.5 >1.2 >1.0
    Peel Strength (90° on aluminum)   N/25mm 3 [adhesive] 9 [adhesive]  
    Application Temperature (continuous)   °C -40 to +125 -40 to +125 -40 to +100
    Overall Thickness (±10%) mm 0.30 0.30 0.18-0.30
    Shelf Life   months 12 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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