SonexProspec foam is 1" thick willtec with a sculpted SonexMini pattern for lining compartments and enclosures. The 2' x 4' panels are coated with a light gray Hypalon coating for oil, water and solvent resistance. SonexProspec foam in FIBER-FREE and ASTM E 84 Class 1 rated for low flammability. SonexProspec composite is fabricated by floating a layer of SonexProspec barrier in 1.25" of SonexProspec foam, resulting in exceptional sound absorbency and sound transmission benefits. The 2' x 4' panels are coated with light gray Hypalon coating for oil, water and solvent resistance. SonexProspec composite is FIBER-FREE and ASTM E 84 Class 1 rated for low flammability.