Dow Chemical Company has introduced a new top coat and adhesive polyolefin materials for 3 layer steel pipe coating systems. DOW HDPE 12110G, a black high density polyethylene top coat material and AMPLIFY GR 320 Functional Polymer, a grafted adhesive resin will contribute to the long term corrosion protection of oil and gas pipelines. The new Dow materials meet stringent performance requirements for coating large diameter steel pipes when used in 3 layer coating system with a fusion bonded epoxy. External tests have shown that different coating systems using these materials exceed the requirements of the DIN 30670 and other international standards.
A 3 layer steel pipe coating system comprised of DOW HDPE 12110G and AMPLIFY GR 320, together with an FBE bonded directly on the steel pipe, can help deliver good coating performance for the lifetime of oil and gas pipeline, while also offering excellent process ability on conventional pipe coating lines. As a top coat material, DOW HDPE 12110G in 3 layer steel pipe coating system offers excellent environmental stress crack resistance excellent physical properties and easy processing. AMPLIFY GR 320, Dow's adhesive, offers excellent adhesion to both the FBE and top coat layers in 3 layer coating system, in addition to easy processing, mechanical strength at high and low temperatures, good temperature resistance and low water absorption. The key objective of steel pipe coating is to prevent or minimize the possibility of pipeline corrosion as a result of extreme external conditions, mechanical impacts or degradation by heat or UV irradiation. To help meet this performance requirement, critical parameters for polyolefin materials used in 3 layer steel pipe coating systems are excellent adhesion and adhesion retention, durability, crack resistance and long-term stability, together with low levels of built in stress during the coating process.