Correction: June 2012 CT

Correction to error in story published in April 2012 issue of CT.

In the April 2012 issue of Composites Technology magazine, the feature article titled “Thermoplastic wind blades: To be or not?” contained two typographical errors that impact the accuracy of important factual content. On p. 31, under the subhead “Not yet in Denmark,” Dr. R. T. Durai Prabhakaran of the Materials Research Div. at Risø DTU (Technical University of Denmark, Roskilde) notes in the fourth paragraph that a cooling rate possible with current large wind blade tooling does not match what is needed for thermoplastics. He is then credited with saying that “cooling rates of 8°C/min to 100°C/min are required to enable the formation and degree of crystallinity necessary for semicrystalline thermoplastics to achieve structural properties and to prevent embrittlement, which results when crystallization occurs too slowly.” Prabhakaran alerted CT to the fact that the upper end of that temperature range has one too many zeros. The correct required cooling rate range is 8°C/min to 10°C/min. The same error is duplicated in point #2 in Table 2, on the same page. CT regrets the inaccuracies, with apologies to Dr. Prabhakaran and all of our readers.