HE421S ni bisphenol isanzwe Epoxy acrylate resin.Ifite ibiranga urumuri rwinshi, ubukana bwinshi, n'umuvuduko wihuse,ni kimwe mubyingenzi bisigaye mumurima UV.Ikoreshwa cyane mubice bitandukanye byo gutwikisha UV nko kumashanyarazi, amashanyarazi ya plastike, wino, no gucapa.