Mpp pipe is made of modified polypropylene, which is called modified polypropylene (mpp) pipe, and its cost is high. The pe pipe is extruded by high density polyethylene (hdpe), and the cost is relatively low. However, it is not easy to distinguish whether the pipe composition is modified polypropylene (mpp) or high-density polyethylene (hdpe) from the appearance, so some mpp pipeline manufacturers pass off mpp pipes with recycled or discarded hdpe, and some original regular manufacturers either give up mpp pipe production or step into the ranks of counterfeiting due to the influence of cost and price; Such a mixed situation has left a serious safety hazard for the cable laying of power engineering, because the power cable has been running at 70? The high temperature is around с, and the temperature of hdpe pipe is 40? Above с, the strength drops greatly (70? с strength decreased by 2/3), and it was softened and deformed by external force, which greatly affected the maintenance of cables in the later period.
In fact, it is not difficult to understand the properties of mpp and hdpe materials and distinguish mpp pipes from non-mpp pipes. Mpp pipe has the characteristics of high temperature resistance, the pipe is rigid, while hdpe pipe is thermoplastic because it can't resist high temperature. After understanding this essential difference, it can be easily identified in the construction site without special testing equipment, and the end of the pipe can be planed with the cutting machine attached to the pipe hot-melt docking machine. Because mpp pipe has the characteristics of high temperature resistance, it will not decompose when cutting, and the cutting surface is smooth and flat. However, pe pipe is not resistant to high temperature, and it will soften and decompose when cutting, and the cutting surface is rough. In addition, people who are familiar with the two kinds of pipes can also identify mpp pipes by tapping pipes and tapping sounds. Because it is rigid, the sound is crisp and loud.