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
Backing thickness
1
Typical Values
1.4 mil (0,04mm)
4.0 mil (.101mm)
25 lb./in (44 N/10mm)
35 oz/in (3,8 N/10mm)
2
Total thickness (backing plus adhesive)
Breaking strength
Adhesion to steel
1
1
Electrical resistance through adhesive
Flame retardancy
3
0.001 ohm
Pass
* Footnote: 1. Test method ASTM D 1000
2. MIL-STD-202 Method 307 maintained at 5 psi (3,4 N/cm
2
) measured over 1 in
2
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.
3M is a trademark of 3M.
Important Notice
All statements, technical information and recommendations
related to the Seller’s products are based on information
believed to be reliable, but the accuracy or completeness
thereof is not guaranteed. Before utilizing the product, the
user should determine the suitability of the product for its
intended use. The user assumes all risks and liability
whatsoever in connection with such use.
Any statements or recommendations of the Seller which are
not contained in the Seller’s current publications shall have
no force or effect unless contained in an agreement signed
by an authorized officer of the Seller.
The statements contained herein are made in lieu of all
warranties, expressed or implied, including but not limited to
the implied warranties of merchantability and fitness for a
particular purpose which warranties are hereby expressly
disclaimed.
SELLER SHALL NOT BE LIABLE TO THE USER OR ANY
OTHER PERSON UNDER ANY LEGAL THEORY,
INCLUDING BUT NOT LIMITED TO NEGLIGENCE OR
STRICT LIABILITY, FOR ANY INJURY OR FOR ANY
DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR
CONSEQUENTIAL DAMAGES SUSTAINED OR
INCURRED BY REASON OF THE USE OF ANY OF THE
SELLER’S PRODUCTS THAT WERE DEFECTIVE.
Electrical Products Division
6801 River Place Blvd.
Austin, TX 78726-9000
800 676 8381
http://www.3m.com/elpd
© 3M 1998
78-8124-4707-2
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