Type C vs Type X Gypsum Board: Key Differences for Fire-Rated Wall Systems Type C and Type X gypsum board are both fire rated, and they are often quoted as if they were interchangeable. They are not. The difference lies in how each core behaves once it is exposed to fire. The Differences at a Glance Feature Type X Type C (Improved Type X) Core Glass fibre reinforced with proprietary additives Higher-density core, improved fibre network and adhesion Fire performance Not less
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