GKG master batch is researched and produced for the heavy calibre buried pipelines. It has good compatibility with HDPE. Its impact strength is slightly higher than the pure HDPE materials. Simple operation. Easy extrusion with a certain ratio mixture, without changing the original production process. Stable quality. The S2 of pipelines with this master batch added is increased greatly, while the toughness keeps unchanged. The master batch well distributes in the resin, and works closely with it. Cost reduction. It can usually save the cost by 20-35%. One pack of GKG and a certain number of color master batch mixing, (50kg:25kg), generally 3-6 minutes, then the pipelines can be directly extruded. Therefore, it can be easily used. Cold water pipe: (12.4Mpa/ 20?) static pressure resistance test 100h, with adding volume 15%. Hot water pipe: (6.5Mpa/ 80?) static pressure resistance test 1000h, with adding volume 8%.