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Copper Shielding

Copper Foil3M™ Embossed Tin-plated Copper EMI Shielding Tape 1345 has an 1.4-mil embossed tin-plated copper foil backing with acrylic pressure-sensitive adhesive and liner. Emboss makes contact thru adhesive. Tin-plate is for soldering and corrosion resistance.

Description
3M™ Embossed Tin-Plated Copper Foil Tape 1345 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

Agency Approvals & Self Certifications
Meets flame retardant requirements of UL510, Product Category OANZ2, and 3M File No. 17385
RoHS 2011/65/EU compliant.
"RoHS 2011/65/EU" means that the product or part does not contain any of the substances in excess of the maximum concentration values ("MCVs") in EU RoHS Directive 2011/65/EU. The MCVs are by weight in homogeneous materials. This information represents 3M's knowledge and belief, which may be based in whole or in part on information provided by third party suppliers to 3M.

Applications
3M™ Embossed Tin-Plated Copper Foil Tape 1345 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 1345 tape, typical shielding effectiveness (far field) is in the range of 75dB to 95dB (30 MHz to 1 GHz).

Specifications
3M™ Embossed Tin-Plated Copper Foil Tape 1345 shall be coated on one side with pressure-sensitive adhesive, which shall not require heat, moisture or other preparation prior to or subsequent to application. The adhesive coating shall be smooth and uniform and be free of lumps and bare spots. There shall be no separator between adjacent layers of the roll. The tape shall perform at a temperature of -40F° (-40°C) to 266°F (130°C) without substantial loss of tensile or electrical properties.

Typical Properties
Not for specifications. Values are typical, not to be considered minimum or maximum. Properties measured at room temperature 73°F (~23°C) unless otherwise stated.

Property (Test Method) Typical Value
US units (metric)
Color Acrylic
Adhesive EMI Shielding, Grounding, LV Conductor
Type of Backing Tin–Plated Copper
Backing Thickness 1.4 mil (0.04 mm)
Total Thickness (ASTM D1000) 4.0 mils (0.101 mm)
Electrical Resistance * 0.001 Ω
Flame Retardancy ** Pass
Breaking Strength (ASTM D3759) 25 lbs/in (44N/10 mm)
Adhesion Strength (ASTM D3330) 45 oz/in (4.98N/10 mm)
Temperature Range -40ºC to +130ºC
Shielding Effectiveness ( ASTM 4935)

75dB to 95 dB, 30 MHz to 1 GHz

* Mil-STD-202 Method 303 maintained at 5 psi (3.4N/cm2) measured over 1 in** 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.
** UL Recognized for flame retardancy per UL 510, Product Category OANZ2, File E17385