Fulltech warm edge spacer is made of polypropylene and stainless steel usingthe main processing technology in glass processing industry.It has almost thesimilar shape as aluminum spacer bar with the same dimension specification.Polypropylene has the thermal conductivity about 1/1000 of that inaluminum,which helps greatly enhance the heat insulation.What's more,thestainless steel can improve the strength of the spacer,prolong the service lifeof IGU as well as guarantee the water tightness and air tightness of the doorsand Windows.