Professional-grade 125 mil thick mastic tape for electrical insulation, moisture sealing, and corrosion protection. UV-resistant with self-healing properties, rated for 1,000V connections and temperatures up to 90°C.
The 3M™ Scotch-Seal™ Mastic Tape Compound 2229 is a premium-grade, 125 mil thick, highly conformable tacky mastic tape designed specifically for demanding electrical insulation, padding, and environmental sealing applications. This professional-grade tape features a rubber-backed mastic adhesive that provides excellent adherence over irregular surfaces while maintaining superior stability across a wide temperature range from -20°C to 90°C (up to 194°F). The tape is engineered with self-healing properties that allow the mastic to flow and restore sealing performance after minor cuts or punctures, ensuring long-lasting protection in both indoor and outdoor environments.
This versatile sealing solution is ideal for insulating electrical connections rated up to 1,000 volts when overwrapped with vinyl or rubber electrical tape, and is specifically formulated for sealing high-voltage cable splice and termination accessories. The UV-resistant construction ensures durability in outdoor weather-exposed conditions, while the tacky mastic layer creates tight seals around complex shapes and contours. It adheres exceptionally well to metals, rubbers, synthetic cable insulations, and jackets, providing comprehensive corrosion protection for cable end seals, duct seals, and exposed electrical hardware.
Each case contains 5 rolls of 1-1/2 inch wide by 30 feet long tape with an easy-release liner for efficient installation. The product is RoHS 2011/65/EU compliant, manufactured in the USA, and backed by a 5-year shelf life. This industrial-grade tape is designed for trained professionals and occupational use only, making it the preferred choice for electricians, cable technicians, and industrial maintenance specialists requiring reliable moisture-sealing performance and environmental protection.
Key Features
- 125 mil thick tacky mastic construction for superior insulation and padding
- Rated for electrical connections up to 1,000 volts when overwrapped with vinyl or rubber tape
- Self-healing mastic properties that restore seal integrity after cuts or punctures
- UV resistant formulation for outdoor and weather-exposed applications
- Easy-release liner for efficient installation and handling
- Excellent moisture resistance and corrosion protection
- Maintains stability across wide temperature range from -20°C to 90°C
- Strong adhesion to metals, rubbers, synthetic cable insulations, and jackets
- RoHS 2011/65/EU compliant for regulatory compliance
- 5-year shelf life with consistent performance
Technical Specifications
| Specification |
Value |
| Product Type | Mastic Tape Compound |
| Brand | 3M Scotch-Seal™ |
| Model Number | 2229 |
| Part Number | 2229-1.5X30FT-K |
| UPC | 00051128585962 |
| Width | 1.5 inches (38.1 mm) |
| Length | 30 feet per roll |
| Thickness | 125 mil (3.18 mm) |
| Color | Black |
| Adhesive Material | Tacky Mastic |
| Backing Material | Rubber-backed with easy-release liner |
| Quantity per Case | 5 rolls |
| Application Temperature Range | -20°C to 90°C (-4°F to 194°F) |
| Maximum Operating Temperature | 90°C (194°F) |
| Application Method | Apply by hand |
| Industries | Electrical, General Industrial |
| Voltage Rating | Up to 1,000 volts when overwrapped |
| UV Resistant | Yes |
| Self-Healing Properties | Yes |
| Shelf Life | 5 years (60 months from manufacture) |
| Regulatory Compliance | RoHS 2011/65/EU Compliant |
| Manufacturing Origin | USA |
| Use Category | Industrial/Occupational use only |
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