DPHI took the lead in the research and development of flame retardant antistatic functional materials, bonded resin materials, conductive flame retardant epoxy resin coating materials, multi-layer reinforced composite technology for coal mine composite pipes, ensuring the industry position and leading the development of the industry, the industry's first color pipe conductive technology, providing Donghong strength for the standardization construction of coal mine pipe systems. In terms of pipeline connection, according to the needs of coal mine for convenient, safe and mechanical connection of pipeline connection, pipeline connection methods such as first-generation crimping connection, second-generation double-sealed connection and third-generation integrated connection have been developed to provide Donghong solutions for safe and efficient connection of coal mine pipeline system.