HE421S shi ne daidaitaccen bisphenol A epoxy acrylate guduro.Yana da halaye na babban sheki, babban tauri, da saurin warkarwa, wandayana ɗaya daga cikin resins na asali a cikin filin UV.Ana amfani da shi a fannoni daban-daban na UV kamar su electroplating bottoms, filastik coatings, tawada, da kuma bugu.