Black Insulating Mastic Tape is a self-bonding, waterproof sealing tape designed for electrical insulation and environmental protection. It provides a durable, weather-resistant seal around wire connections, splices, and cable terminations. The tape adheres easily to irregular surfaces, forming a long-lasting, moisture-resistant barrier. Ideal for both indoor and outdoor applications, including underground and overhead cable joints. Offers excellent electrical insulating properties and resists UV, ozone, and aging.Commonly used in utility, telecom, industrial, and electrical maintenance work.
Features
| High sealing and waterproof performance |
|---|
| Excellent electrical insulation & adhesion to metals & cable insulations |
| High dielectric strength, making it ideal for splicing and terminating power cables. |
| A perfect environmental seal, protection from moisture, dust, aging & corrosion |
| Self-bonding & conformable as it fuses to itself and adapts to irregular shapes for quick, gap-free insulation |
Technical info
| TEST DESCRIPTION | TEST STANDARD | SPECIFICATIONS | OBSERVED VALUE |
|---|---|---|---|
| Width | Dimensional | 10mm to 150mm | |
| Thickness | Dimensional | 1 to 3 mm | |
| Length | Dimensional | As per Requirement | |
| Softening Point | ASTM D-36 | 100 °C (min) | 110 C |
| Water absorption R.T. for 24 hrs. | 0.5% (max) | 0.30% | |
| Volume resistivity | ASTM D 1373 | 1x10^10 Ohm-cm (min) | 4x10^14 Ohm-cm |
| Needle penetration | ASTM D-5 | 70 to 130 Unit/10sec | 90 |
| Density | ASTM D 792 | 1.5 to 1.65 G/cc | 1.52 |
| Brittleness temperature | ASTM D 2137 | -30 °C (min) | Pass |
| Service Temp. Range | (-)4.4 °C to 93.3 °C | Pass | |
| Penetration 300 gram cone | ASTM D217 | 80 to 95 | 80 |
| Elongation | ASTM C908 | 400% min. | 500% |
| Adhesive Tensile Strength | ASTM C907 | 1.26 kg/cm^2 to 1.40 kg/cm^2 (min) | 1.50 kg/cm^2 |
| Peel Adhesion | ASTM D3330 | >0.6kg/cm2 | 0.8kg/cm2 |
| Water Penetration | ASTM W2140 | No water penetration | Pass |
Specifications
| INSTALLATION | Easily moulded by hand to conform to irregular shapes even during low temperature |
|---|---|
| SHELL LIFE | Permanently elastic & resistant to aging |
| AVAILABLE COLORS | Black |
| VOLTAGE CLASS | 11KV, 25KV and 36KV joints and terminations |
| APPLICATIONS | Reinforcement in heat shrink sealed areas Water resistant sealing at cable entry points Suitable for sealing insulating cables and splices in low, medium and high voltage |
