Release film is .001 inches thick x 15 inches wide and is not perforated. Polyolefin release film is compatible with epoxy systems. Use this film in vacuum presses between the breather and topsheet to prevent sticking. For permeable topsheets, consider using perforated release instead in order to for breather to absorb excess epoxy. The release film is ideal for room temperature curing epoxies, or heated presses up to 284°F.