General Information of 3M Scotch Varnished Cambric Tapes 2520
3M Scotch Varnished Cambric Tapes 2520 are made from straight-cut woven cotton cambric fabric. The fabric is oil primed and coated with a high-grade yellow electrical insulating varnish. Varnished cambric tapes are flexible, electrically insulating and moisture resistant with a smooth finish. Scotch Varnished Cambric Tape 2520 is yellow with a pressure-sensitive adhesive and 8 mils thick.
They are designed to perform continuously in temperatures up to 105°C (220°F) with excellent resistance to abrasion, puncture and cut-through. The adhesive on Scotch Varnished Cambric Tape 2520 holds the tape in position after application.
Key Features
- Excellent dielectric strength.
- Electrical properties are stable up to 105°C.
- High puncture and cut-through resistance.
- Varnished cambric tapes are rated for Class A (105°C).
- Non-corrosive adhesive on Scotch Varnished Cambric Tape 2520. Adhesive holds film in position until the jacket is applied.
Key Applications
- For insulating joints requiring rapid and clean re-entry such as motor lead and service drop connections, heavy split- bolts in raceways and bus bar insulating. Use in areas where mechanical protection and puncture resistance is critical.
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| Physical Properties (Test Method) | 2520 |
| Color | Yellow |
| Surface Finish | Dry with Adhesive |
| Thickness (ASTM D 374) | 8 mils |
| Tensile Strength (ASTM D 295) | 50 ils./in. |
| Adhesion to Steel (ASTM D 1000) | 13 oz./in |
| Adhesion to Backing (ASTM D 1000) | 8 oz./in. |
| Thermal Stability | Class A |
| Solvent Resistance | Excellent |
| Oil Resistance | Excellent |
| Dielectric strength (ASTM D 295) | 800 V/mil |
