This breather or bleeder is a non-woven polyester that is 15 inches wide. Use in the vacuum press directly below the bagging film. It allows for the vacuum pressure to be applied evenly across the part and helps to protect the bag against failure from sharp corners and edges. When used as a bleeder with the perforated film, it will absorb the excess resin in the layup. The breather/bleeder is ideal for room temperature curing epoxies, or heated presses up to 375°F.