Form: This specification establishes the requirements for two types and three classes of a two component@ fast curing at low and ambient temperature@ polythioether sealing compound for use in sealing integral fuel tanks and other aircraft structures. Temperature capabilities are identified in 1.2.1. Classification: The sealing compound shall be classified as follows: Types: There are two types of sealants furnished to this document. Additionally@ Type I is furnished in 3 grades as shown below. Type I - Fuel resistant sealant for use form -80?F to +300?F (-63?C to +149?C) with intermittent use to +400?F (204?C). Grade A - For general use in fuel tanks and aircraft structures Grade AI - Ambient cure or immediate heat cure at temperatures up to 350?F (175?C) immediately after application. Available as class B and Class C. Grade B - Enhanced craze resistance@ for use with acrylic aircraft transparencies. Type II - Corrosion inhibitive@ fuel resistant sealant for use form -80?F to +300?F (-62?C to +149?C) with intermittent use to +360?F (+182?C). Classes: Class A - Suitable for brush application Class B - Suitable for application with extrusion gun or spatula Class C - Suitable for faying surface sealing applications Application time: The minimum application time in hours for each class shall be: Class A - 1/4@ 1/2@ 2 class B - 1/4@ 1/2@ 2 Class C - 4