PR-1428 Class B is a low adhesion sealant. It has a service temperature range from -65F (-54C) to 250F (121C), with intermittent excursions up to 275F (135C). The material is designed for use as an access door sealant or in the fabrication of form-in-place (FIP) gaskets. It can also be used to protect electrical wires, terminals and equipment against fuel, moisture, dirt and short circuits.PR-1428 Class B is a two-part, manganese dioxide cured, polysulfide compound. The uncured material is a low sag, thixotropic paste suitable for application by extrusion gun or spatula. It cures at room temperature to form a removable seal to common aircraft substrates.
