3M Scotch Self-Fusing Silicone Repair Tape 4704, 25 mm x 3 m, Black

Electricians and maintenance crews reach for this tape when a quick, permanent fix is needed on cables, hoses, or pipes in harsh environments. The 3M Scotch Repair Tape 4704 is a self-fusing silicone tape that bonds to itself, creating a seamless, waterproof, and insulating barrier without any adhesive residue.

Key specifications

• Tape type: Self-fusing silicone repair tape
• Material: Silicone rubber
• Colour: Black
• Tape width: 25 mm
• Tape length: 3 m
• Tape thickness: 0.5 mm
• Temperature resistance: -60°C to +260°C
• Dielectric strength: 12 kV/mm
• Tensile strength: 4.8 MPa
• Elongation at break: 450%
• Water resistance: Waterproof
• UV resistance: Excellent
• Chemical resistance: Good (fuels, oils, acids, solvents)
• Adhesive type: Non-adhesive (self-amalgamating)
• Insulation class: H (180°C)
• Conformability: Highly conformable
• Residue: Leaves no residue upon removal

Why choose it

This tape fuses to itself within minutes, forming a solid, homogeneous layer that resists moisture, UV, and chemicals. Unlike standard adhesive tapes, it won't unravel or leave sticky residue, making it ideal for both temporary and permanent repairs. Its high dielectric strength and broad temperature range ensure reliable electrical insulation in demanding conditions.

Ideal use cases

• Emergency repair of electrical cables and wiring
• Sealing and repairing hoses, pipes, and tubing
• Corrosion protection for metal surfaces
• Insulating connections in outdoor or wet environments
• Automotive and marine maintenance

Good to know

For best results, stretch the tape while wrapping and overlap each layer by half. The tape will bond to itself, creating a uniform, void-free covering. It can be removed cleanly with a knife, leaving no residue on the underlying surface.