Thermafiber® FireSpan® products are designed to provide enhanced fire protection in curtain wall and perimeter fire containment systems. These products are non-combustible, moisture-resistant, non-corrosive, non-deteriorating, mildew-resistant and vermin-resistant. Its natural dark color provides shadowing in glass spandrels. FireSpan® 90 insulations provide thermal insulation, fire containment, enhanced acoustical performance, and vapor control.