SWD250 Spray Rigid Polyurethane Foam yog tsim los ntawm SWD Urethane Co. USA nyob rau xyoo 1970s.Nws tau dav siv rau lub tsev phab ntsa hluav taws xob rwb thaiv tsev hauv Teb Chaws Asmeskas thiab tau lees paub tias yog Lub Hnub Qub Zog los ntawm USEPA.SWD250 Polyurethane ua npuas ncauj yog ib cov txheej txheem tuab Microensorized Cov Khoom Siv Hluav Taws Xob Cov Khoom Siv Hluav Taws XobSiv cov cuab yeej tshuaj tsuag ncaj qha, tsis muaj seams ntawm cov npuas npuas uas ua tiav txheej impermeable yog tsim rau ntawm substrate.Nws tsim cov txheej txheem tiv thaiv kom tsis txhob muaj dej nqus dej thiab daws cov teeb meem ntawm cov phab ntsa hauv tsev thiab cov teeb meem kub rwb thaiv tsev.