It is the composite PPB external pipe product. Differently from a metal pipe, it is the permanent product that is not exposed to the corrosion and electric leakage caused by the contact with cement and water. (The lifetime of the product = the lifetime of a building)
The magnesium having the purity of no less than 95% is put into the pipe and compressed so that the heat transfer speed of the product is three times faster than that of water.
The design of sealing the space between the composite PPB external pipe and the internal pipe (the stainless pipe and the steel pipe) enables the high speed of the 2nd thermal diffusion and the excellent function of the thermal storage.