3M 1345 Tape is a conductive backing used for grounding and EMI shielding applications. It consists of a 1-ounce deadsoft tin-plated copper foil backing and an aggressive pressure-sensitive acrylic adhesive.
3M 1345 Tape consists of an embossed 1‑ounce dead‑soft tin‑plated copper foil backing with an aggressive pressure‑sensitive acrylic adhesive. The embossed pattern penetrates the adhesive to create reliable metal‑to‑metal contact, making it suitable for grounding and EMI shielding applications.
The sheet provides key technical values such as backing thickness, breaking strength, adhesion, electrical resistance, and flame‑retardancy, as well as typical shielding effectiveness ranging from 75 dB to 95 dB across 80 MHz to 1 GHz.
| Backing thickness | 1.4 mil (0.04 mm) |
|---|---|
| Total thickness (backing plus adhesive) | 4.0 mil (0.101 mm) |
| Breaking strength | 25 Ib./in (44 N/10 mm) |
| Adhesion to steel | 45 oz/in (4.9 N/10 mm) |
| Electrical resistance through adhesive | 0.001 Ω |
| Flame retardancy | Pass (ASTM D 1000, UL 510) |
| Typical shielding effectiveness (far field) | 75 dB to 95 dB (80 MHz to 1 GHz) |
| Standard widths | 1/4" to 23" |
It provides 75 dB to 95 dB attenuation in the far field over 80 MHz to 1 GHz.
The backing thickness is 1.4 mil (0.04 mm).
Yes, it passes flame‑retardancy testing per ASTM D 1000 and UL 510.
Standard widths range from 1/4" to 23".