3M Electrically Conductive Adhesive Transfer Tape 97040 pages

Technical Data
May 2011
3M™ Electrically Conductive Adhesive Transfer Tape 9704
Product Description
3M™ Electrically Conductive Adhesive Transfer Tape (ECATT) 9704 is a pressure sensitive adhesive (PSA) transfer tape
with anisotropic electrical conductivity. The PSA matrix is filled with conductive particles which allow interconnection
between substrates through the adhesive thickness (the “Z-axis”) but are spaced far enough apart for the product to be
electrically insulating in the plane of the adhesive. The PSA tack properties and lack of any thermal curing make Tape
9704 easy to use in assembly operations.
Tape 9704 is designed to have lower typical outgassing residuals as compared to a similar type conductive adhesive
product, such as 3M™ Electrically Conductive Adhesive Transfer Tape 9705.
Tape 9704 electrically connects and adhesively bonds medium pitch flexible circuits with other flexible circuits (flex),
rigid printed circuit boards (PCB) or LCD screens. Tape 9704 offers good adhesion to common PCB substrates such as
gold, FR-4 epoxy, Kapton™ polyimide and polyester films. Stable electrical performance in any flexible circuit
interconnection application may require added mechanical reinforcement (clamping or compressing) in the bond area.
Tape 9704 also electrically connects and adhesively bonds EMI/RFI shield and gaskets to metal frames and enclosures.
The low contact resistance and tape construction result in good EMI performance. Tape 9704 can be applied as die cut
parts or in roll form and has good adhesion to common EMI/RFI substrates such as, plated surfaces, stainless steel, and
smooth gasket materials.
Tape 9704 is a more surface aggressive ECATT on many substrates which will allow a higher level of adhesion build as
measured via a peel adhesion test method and as compared to the 3M™ Electrically Conductive Adhesive Transfer Tapes
9703 or 9705. As Tape 9704 is a more aggressive ECATT tape, it is generally not compatible with Indium Tin Oxide (ITO)
coatings or other easily corroded surfaces.
Construction
Property
Value
Adhesive Type
Filled Acrylic Pressure Sensitive
Release Liner
Silicone Treated Polyester liner (PET)
Approximate Thickness
Adhesive
2 mil (50 µm)
Liner
PET = 2 mil (50 µm)
3