3M™ Glass Cloth Electrical Tape 79 is a 7-mil woven insulating glass cloth tape with an acrylic pressure-sensitive adhesive. This tape is used to electrically insulate and provide mechanical protection at temperatures to 302° F (150° C). This tape provides insulation and solvent-resistant protection for use as coil cover, anchor, banding and core, layer and crossover insulation. It is edge-tear resistant, conformable and printable. It also features a superb absorption of resin and varnishes.
The 3M Glass Cloth Electrical Tape 79 is a 7‑mil woven glass‑cloth tape coated with an acrylic pressure‑sensitive adhesive. It provides electrical insulation and mechanical protection up to 150 °C (302 °F) and is suitable for coil, transformer, motor, banding and strapping applications.
The sheet includes typical physical and electrical properties, shelf‑life recommendations, ordering information, and safety notices. The product is UL‑recognized, RoHS‑compliant, and available in standard 60‑yard rolls or custom lengths.
| Backing Thickness | 5.0 mils (0.127 mm) |
|---|---|
| Operating Temperature | 150 °C (302 °F) |
| Adhesion to Steel | 30 oz/in (3.3 N/10 mm) |
| Dielectric Breakdown | 3000 V |
| Breaking Strength | 150 Ibs/in (262 N/10 mm) |
| Insulation Resistance | 2.7 × 10⁸ MΩ |
The tape can operate continuously at temperatures up to 150 °C (302 °F).
It has a 5‑year shelf life when stored at 50 °F‑80 °F (10 °C‑27 °C) and less than 75 % relative humidity.