Products

Keratherm Double Sided Thermal Adhesive Tape KL 90 & KL 91

Keratherm Green

Kertherm® 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

Graphs (Click for full-size)

Compressibilities of
KL 90 and KL 91

Properties

Keratherm KL 90 & KL 91
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 λ W/mK 1.4 1.35
Electrical Properties
Breakdown Voltage Ud;ac kV 3 3
Dielectric Breakdown Ed;ac kV/mm 10.0 10.0
Volume Resistivity   Ωcm 2.6x104 2.6x104
Dielectric Loss Factor tan δ 1 30.5x10-2 30.5x10-2
Dielectric Constant εr 1 18.5 18.5
Mechanical Properties
Measured Thickness   mm 0.300 0.300
Density ρ g/cm³ 1.98 1.87
Hardness   Shore A 45 59
Tensile Strength   N/mm² 0.25 0.25
TML   Ma.% 0.15 0.15
Flame Rating   UL 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 25x25 mm² (1inch²);
        glued on an AlCuMg1-substrate, stored at room temperature for 62 hours.