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This boardis similar in composition to Type X drywall,

except that it has more glass fibers,

and, it has another ingredient in the

gypsum core. This ingredient is a

shrinkage-compensating additive, a

form of vermiculite. When exposed to

high heat, the gypsum core shrinks

but the shrinkage-compensating element

expands at about the same rate

as shrinkage occurs in the waterdepleted

gypsum.

The gypsum core then is more

stable in a fire and remains in place

even after the combined water in the

gypsum has been driven off.

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