Ddd-20 butyl semi-conductive self-adhesive rubber tape is a kind of polyvinyl chloride insulating tape with excellent performance and economic practicality. It has excellent wear resistance, moisture resistance, acid and alkali resistance, and the ability to resist environmental changes (including ultraviolet rays). It is an ideal material for waterproof sealing and joint insulation of various rubber and plastic wires and cables, including power cables and communication cables. It can also be used for temporary waterproofing and anti-corrosion of pipelines.