1245 Tape
Embossed Copper Foil
Data Sheet
Product Description
3M 1245 Tape consists of an embossed 1-ounce
deadsoft copper foil backing and an aggressive
pressure-sensitive acrylic adhesive. The edges of the
embossed pattern pressed into the foil cut through the
adhesive layer to establish reliable metal-to-metal
contact between the backing and the application
substrate.
• Embossed deadsoft 1-ounce copper foil backing
• Conductivity “through the adhesive”
• Supplied on a removable liner for easy handling
and diecutting
Like all 3M shielding tapes, 3M 1245 is available in
standard and custom widths and lengths. Standard
length is 18 yards.
• Widths from 1/4” to 23”
• Longer lengths up to several times normal length,
dependent upon width. Check with Customer
Service.
Applications
3M 1245 Tape is typically used for applications
requiring excellent electrical conductivity from the
application substrate through the adhesive to the foil
backing. Common uses include grounding and EMI
shielding in equipment, components, shielded rooms,
etc. The copper foil backing is solderable and resists
oxidation and discoloration.
Shielding Effectiveness
Many factors determine the true shielding
effectiveness of a shielding tape, including type and
thickness of foil, adhesive type, intimacy of contact,
smoothness of application surface, strength and
frequency of the EMI signal, etc. However, using
standard tests and fixtures, it is possible to determine
a value for the attenuation.
For 3M 1245 Tape, typical shielding effectiveness
(far field) is in the range of 75dB to 85dB (30 MHz
to 1 GHz).
Properties Typical Values
Backing thickness 11.4 mil (0,04mm)
Total thickness (backing plus adhesive) 4.0 mil (.101mm)
Breaking strength 1 25 lb./in (44 N/10mm)
Adhesion to steel 1 35 oz/in (3,8 N/10mm)
Electrical resistance through adhesive 2 0.001 ohm
Flame retardancy 3 Pass
* Footnote: 1. Test method ASTM D 1000
2. MIL-STD-202 Method 307 maintained at 5 psi (3,4 N/cm2) measured over 1 in2 surface area. The edges of the
embossing pattern in the foil backing penetrate through the nonconductive adhesive to make metal-to-metal contact
with the application substrate.
3. UL-recognized for flame retardancy per UL 510, Product Category 0ANZ2, File E17385.