8940 3M

Technical Data August 2014 3M Thermally Conductive Adhesive Tape 8940 Product Description 3M Thermally Conductive Adhesive Tape 8940 is designed to provide an efficient heat transfer path between heat generating components and heat sinks or other cooling devices. The tape consists of a carrier, highly loaded with ther- mally conductive fillers, coated on both sides with a high temperature resistance acrylic pressure sensitive adhesive. Features and Benefits High mechanical strength Ideal for thin bonding applications Wider and longer roll is available Good thermal transfer Halogen free High temperature resistance Low outgassing Easy to convert Product Construction 3M Thermally Conductive Adhesive Tape 8940 Color Beige Carrier Filled Copolymer Adhesive Type Modified Acrylic Adhesive Tape Type Double-Coated Tape Thickness 0.190 mm Liner Thickness 0.075 mm Typical Applications Applications requiring thin bonding with good thermal transfer. The tape performance properties have been primarily adapted to meet the demanding criteria for use in Automotive Electronic Thermal Management. Typical applications are: Engine Control Units, ABS Systems, Gear Control Units. 3M Thermally Conductive Adhesive Tape 8940 Typical Properties and Performance Characteristics Note: T he following technical information for 3M Thermally Conductive Adhesive Tape 8940 should be considered representative or typical only and should not be used for specification purposes. Thermal Properties Test Unit Value Test Method Thermal Conductivity at 25C W/m*K 0.4 Mod. ASTM D 5470 6 Coefficient of Thermal Expansion (-40 to +150C) mm/C 140 x 10 3M Method (TMA) 2 Cin /W 0.78 3M Thermal Impedance 2 Ccm /W 5.1 3M Electrical Properties Test Unit Value Test Method (*1) Breakdown Voltage typical value kV 9.5 IEC 60243-1 (*2) Dielectric Strength typical value kV/mm 52.8 IEC 60243-1 13 Volume Resistivity cm 2.5 x 10 ASTM D257 Footnote: (*1) Average value (not for specification purposes). Standard deviation of 1.6 kV has been observed. (*2) Average value (not for specification purposes). Standard deviation of 10 kV/mm has been observed. Mechanical Properties Test Unit Value Test Method 90 Peel Adhesion to 20 min dwell time room temperature N/cm 5.0 AFERA 4001 Aluminum Substrate 24 hour dwell time room temperature N/cm 6.0 AFERA 4001 (AlMg R 0.48 m R 2.4 m) a z 3 150C N/cm 4.9 AFERA 4001 180C N/cm 2.4 AFERA 4001 Lap Shear 20 min dwell time room temperature MPa 5.3 ASTM D 1002 24 hour dwell time room temperature MPa 9.0 ASTM D 1002 After 24 hour 150C MPa 6.8 ASTM D 1002 After 24 hour -40C MPa 9.0 ASTM D 1002 Holding Power 1000 g load room temperature Minutes 10,000+ AFERA 4012 500 g load 70C Minutes 10,000+ AFERA 4012 2 Tensile Strength Tensile Strength N/mm 6-7 EN ISO 527-2 Elongation at break % 80-120 EN ISO 527-2 Liner Properties Liner release cN/25.4 mm 15 FINAT TM3 Temperature Performance Thermal Stability Visual No Change 3M 225C Dwell 60 min (Tape was applied between a glass and an aluminum panel) Continuous Operating Temperature Range C -40 up to 150 3M (2)