The source material of our UV-Silo's® is the fibre KoSa high-tenacity polyester yarn. The Hoechst AG, former manufacturer of this polyesterfibre, ran tests in the area of Frankfurt/Main with this material under the name of TREVIRA-HOCHFEST® for its resistance against sunlight and UV radiation. One result was, that a black thread ist much more UV-resistant than a white thread. This knowledge was the basis of a patent that was given to Silobau Steinecke by the German Patent Office after thorough testing (DBP Nr. 32 04 758.4).