GRP internal pipe:
is  manufactured  using  engineered material that consists of a thermoset resin and afiber fiber reinforcement.The liquid resin is combin ed with the fiber reinforcement in the  manu ufacturing  process  and  cures into  a  solid laminate.

 Polymer Concrete External Pipe

 Polymer Concrete as an exterior structure of the pipe provides the high-compressive and high stiffness strength required in microtunneling installations. Like the GRP internal pipe its bonding material is polyester resin and when fully cured gives the pipe additional properties of elasticity, safety against fracture and  Corrosion resistance.

 Manufacturer of the HPHS Pipe System:

GRP internal pipe is produced by continuous filament winding process. The pipe in itself is constructed with a special corrosion-barrier which provides protection of the structural layers against chemical attack. After calibrating and chamfering the GRP spigot ends, polymer concrete is cast around it and when cured the pipe system becomes monolithic with the GRP interior pipe