3M™ Flame Resistant Hook Fastener SJ3519FR is one part of our two-part fastener solution designed to provide great durability for thousands of closures. This nylon, woven loop reclosable fastener features a rubber based adhesive and is flame resistant meeting F.A.R. 25.853 paragraph (a)(1)(i) 60 second vertical burn test. It mates with SJ3518FR.