Pressure Strip is an uncured modified butyl rubber designed to be placed in corners where pressure is difficult to apply with only a vacuum bag. Pressure Strip will cure on a 250°F (120°C) or a 350°F (176°C) lay?up in an autoclave or oven. Maximum use temperature is 450°F (230°C). Pressure Strip is used as an expendable item and discarded after each cure. Pressure Strip is applied on top of the release film in the corner of the lay?up prior to vacuum bagging. Pressure Strip is a compound of butyl rubber, resin plasticizers and fillers. There are no silicones used in the manufacture of this product.