3M Scotch® Rubber Mastic Tape 2228, commonly referred to as 3M 2228, is a conformable, self-fusing rubber electrical insulating and sealing tape. The 3M 2228 tape features an ethylene propylene rubber (EPR) backing coated with a durable, temperature-stable mastic adhesive. With a thickness of 65 mils (1.65 mm), it ensures quick build-up during application. Designed for electrical insulation and moisture sealing, the 3M 2228 tape is UL recognized for applications up to 130°C, offering excellent resistance to moisture and UV exposure. It is suitable for both indoor and outdoor use, even in weather-exposed environments.
Features of 3M Scotch® Rubber Mastic Tape 2228
- Conformable for use over irregular surfaces
- Compatible with solid dielectric cable insulations
- Self-fusing tape for secure bonding
- Flexible across a wide temperature range
- Exceptional weather and moisture resistance
- Strong adhesion and sealing with copper, aluminum, and power cable jacket materials
- Thick construction enables quick build-up and padding over irregular connections
Applications of 3M 2228
- Primary electrical insulation for cable and wire connections rated up to 1000 volts
- Electrical insulation and vibration padding for motor leads rated up to 1000 volts
- Primary electrical insulation for bus bar connections rated up to 35kV (as per 3M drawing 2047B-106)
- Padding for irregularly shaped bus bar bolted connections
- Moisture sealing for cable and wire connections, service drops, and ground wire/rod connections
- Jacket sealing on power cable applications
The 3M 2228 tape delivers superior performance for electrical insulation and sealing, making it an essential choice for professionals.
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| Properties | Typical Value |
| Temperature Rating | 266ºF (130ºC) |
| Color | Black |
| Thickness | 65 mil (1,65mm) |
| Adhesion | Steel 15.0lb/in (26,2N/10mm) PE 10.0lb/in (17,5N/10mm) |
| Fusion | Pass (Type I) |
| Tensile Strength | 150psi (1,03N/mm2) |
| Elongation | 1000% |
| Dielectric Breakdown (Wet or Dry) | 500V/mil (19,7kV/mm) |
| Dielectric Constant | 3.5 |
| Dissipation Factor | 1.0% |
| Water Absorption | 0.15% |
| Water Vapor Transmission Rate | 0.1g/100in2/24hr |
| Ozone Resistance | Pass |
| Heat Resistance | Pass, 130ºC |
| UV Resistance | Pass |
