DNV GL certifies rotor resin
Covestro-developed polyurethane for turbine blades passes test
DNV GL has certified a new resin developed by Covestro that is to be used to manufacture wind turbine rotor blades.
Polymer materials supplier Covestro said the blades are fabricated in a special process from the polyurethane resin and a glass fibre fabric.
The resin is the first to receive the certification, the company said.
It was developed by the Covestro Wind Competence Center in Denmark and the Polyurethane Research Center in Leverkusen.
Covestro has tested the resin on an industrial scale together with Saertex, a manufacturer of glass and carbon fibre fabrics, and engineering specialist Hubers.
A prototype of a 45-meter-long spar cap has been fabricated at the German Aerospace Center in Stade.
Covestro wind energy program global head Kim Klausen said: “This brings us a big step closer to our goal of increasing the efficiency of wind power generation.
“After epoxy resins mainly were used in the industry in the past, the time has come to establish the high performance and cost advantages of polyurethane in wind power generation.”