PETIA is a multifunctional reactive diluent with a high degree of acrylic unsaturation and finds use in a variety of ultraviolet light (UV) and electron beam (EB) curable coatings and ink systems where a high degree of crosslinking is desired. PETIA is a mixture of predominantly the tri- and tetra-acrylate esters of pentaerythritol. PETIA has a higher ratio of tri - to tetra-acrylate ester than the similar product EBECRYL 180, and therefore remains liquid at normal ambient temperatures.