As it can be seen from the attached data, the quality of coating performed by DATA Steel far exceeds the requirements of all international specifications. Tighter specifications can also be met, and clients are requested to discuss their specific requirements with the Customer Liaison Department at DATA Steel.
A number of factors vary with temperature and the combination of layers e.g. peel strength or adhesion - the relative strength of the polar binding between epoxy and adhesive; the mechanical toughness of the adhesive and the thermal welding bond between the outer layer and the adhesive layer. The weakest of these three determines overall adhesion performance, and the design of a coating system must strive to provide optimised adhesion (peel strength) under design conditions. Peel strength is also one of the most important tests in production control.
The extent of the damage likely to result from the total penetration of the coating and the performance of the epoxy adhesion to the steel surface under the influence of Cathodic protection, is tested using Cathodic Disbonding tests. Vulnerability to the type of damage caused to outer pipe coating layers and epoxy layers by rocks and other sharp objects is tested using indentation resistance tests.
Polypropylene Systems: In cases where the operating temperature is between 85 oC and 110 oC, polypropylene systems are used instead of polyethylene systems. Polypropylene systems are very good at sustaining static loads, such as stones.