PN1 Commercial Grade Aramid Fiber Honeycomb PN1 commercial grade aramid fiber honeycomb is manufactured from DuPont Nomex® paper (or equivalent) and coated with a heat resistant phenolic resin. PN2 Aerospace Grade Aramid Fiber Honeycomb PN2 aerospace grade aramid fiber honeycomb exhibits outstanding flammability properties. It is manufactured from DuPont Nomex® paper (or equivalent) and coated with a heat resistant phenolic resin.