1345 Tape
Embossed Tin-Plated Copper Foil
Data Sheet
Product Description
3M 1345 Tape consists of an embossed 1-ounce
deadsoft tin-plated 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 tin-plated copper foil
backing
• Conductivity “through the adhesive”
• Supplied on a removable liner for easy handling and
diecutting
Like all 3M shielding tapes, 3M 1345 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 1345 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 tin plating on the copper foil backing
facilitates soldering and improves resistance to
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 1345 Tape, typical shielding effectiveness
(far field) is in the range of 75dB to 95dB (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 45 oz/in (4.9 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.
Innovation
Jan. 2000
3M United Kingdom PLC
Electrical Products Group
Hudson Road
Bedford MK41 0HR
Tel: 01234 268868
Fax: 01234 229433
3M Ireland
Electrical products Group
3M House, Adelphi Centre
Dun Loaghaire, CO. Dublin, Ireland
Tel: (01) 2803555
Fax: (01) 2803509
Important Notice
Technical information provided by 3M is based on experience and/or tests
believed to be reliable, but their accuracy is not guaranteed and the results may
not be relevant to every user’s application. For this reason 3M does not accept
responsibility or liability, direct or consequential, arising from reliance upon any
information provided and the user should determine the suitability of the products
for their intended use. Nothing in this statement will be deemed to exclude or
restrict 3M’s liability for death or personal injury arising from its negligence. All
questions of liability relating to 3M products are governed by the seller’s terms of
sale subject where applicable to the prevailing law
If any goods supplied or processed by or on behalf of 3M prove on
inspection to be defective in material or workmanship, 3M will (at its
option) replace the same or refund to the Buyer the price paid for the
goods or services. Except as set our above, all warranties and
conditions, whether express or implied, statutory or otherwise are
excluded to the fullest extent permissible at law.
3M and Scotchcast are trademarks of the 3M Company. Printed in
the UK.
© 3M United Kingdom PLC, 1999
