Fire Rated Gypsum Board Type X: Ratings, Standards and Specification Guide Fire rated gypsum board Type X is a gypsum panel formulated with glass fibres and other additives so that it performs substantially better than standard board when exposed to fire. It is the base component of rated partitions, ceilings and shaft walls. What "Type X" Actually Means Type X is a defined designation, not a marketing term. Under ASTM C1396, a Type X gypsum board must achieve a fire
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