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 120°C (250°F) or a 176°C (350°F) lay-up in an autoclave or oven. Maximum use temperature is 230°C (450°F). 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.