PR-1995 Primerless, Two-Part Firewall Sealant

PR-1995 Class B is a primerless two-part, firewall sealant based on silicone polymer. This material is designed for sealing firewall structures against the passage of air and vapors. The cured compound has a service temperature from -65°F (-54°C) to 400°F (204°C) and will withstand flash temperatures up to 3500°F (1927°C).  PR-1995 Class B will remain an effective sealant after long-term exposure to phosphate ester based hydraulic fluids. The following tests were run in accordance with Northrop’s MS-433 specification test methods.