T.R.U. REF-7 Blue Engineering Grade Reflective Tape: 1 in. wide x 30 ft. length Thickness: 5.5 MIL With Enclosed Lens Retroreflective Urethane Film Coated With a Aermanent Acrylic Adhesive. Meets or exceeds requirements of Federal Specification LS-300C (Reflectivity 1, Class 1), FP-85 (Type II), and ASTM D4956-94 (Type 1). Primarily designed for permanent and temporary traffic signage. Temperature Range resistance: -40 F to +140 F (40 C to 82 C). Adhesion: 24 hours dwell time, but in 15 minutes adhesive will reach 75%.