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 “t hrough 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 u sed 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 attenu a tion.
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 mai nta i ned at 5 psi (3,4 N/cm2) measured over 1 in 2 surf ace area. The edges of t he
embossing pattern in the foil backing penet rate t hrough the nonconduc ti ve adhesive to make metal-to-metal contact
with the applicati on substrate.
3. UL-recognized for fl am e retardancy per UL 510, Product Category 0ANZ2, File E17385.
3M is a t rademark of 3M.
Important Notice
All statem ents, tec hnical information and recommendations
related to the Sell e r’s products are based on information
believed to be reliable, but the accuracy or completeness
thereof is not guarant eed. Before utilizing th e product, the
user should determine the suitability of the product for its
intended use. The user assum es all risks and l i abi lity
whatsoev er in connecti on wit h such use.
Any stat ements or recom m endati ons of the Seller which are
not contained i n the Seller’s current publications shall have
no force or effect unl ess cont ai ned in an agreement signed
by an authorized offi cer of the Seller.
The statements contai ned herei n are made in lieu of all
warranties, expressed or implied, incl udi ng but not lim it ed to
the implied warrant ies of merchantability and fitness for a
particular purpose which warranties are hereby ex pressly
disclaimed.
SELLER SHALL NOT BE LIABLE TO THE USER OR ANY
OTHER PERSON UNDER ANY LEGAL THEORY,
INCLUDING B UT NOT LIMITED TO NEGLIGENCE OR
STRICT LIABILITY, FOR ANY INJURY OR FOR ANY
DIRECT, INDIRECT, SPECIAL, INCIDENTA L OR
CONSEQ U ENTI AL DA MAGES SU STAINED OR
INCURRED BY REAS ON OF THE USE OF ANY OF THE
SELLE R’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
