Abstract: A gypsum-based construction material may include a gypsum core. The gypsum core may include a physically modified starch component, and a core bubble median size (D50) of at least about 80 microns and not greater than about 800 microns. The gypsum core may further have a thickness of not greater than about 27 mm, a board weight of at least about 1150 lbs/msf and not greater than about 2600 lbs/msf, a core hardness of at least about 60 N, and a nail pull of at least about 60 lbf.

Abstract: A gypsum-based construction material may include a gypsum core. The gypsum core may have a core bubble median size (D50) of at least about 150 microns and not greater than about 600 microns, and a contacting bubble surface percentage of not greater than about 50%. The gypsum core may further have a water absorption of not greater than about 5.0%.

Abstract: According to one embodiment, a gypsum-based slurry composition is disclosed. The gypsum-based slurry composition can include a precursor stucco component, a precursor reinforcement component comprising glass fibers coated with a glass fiber coating. The glass fiber coating can comprise PVOH, PVAC, hydrophilic silane, or a combination thereof.

Abstract: A method for measuring the weights of phase components in a calcium sulphate material, e.g., gypsum or stucco, in particular for measuring the weights of DH, HH and AIII phases. The method includes (a) weighing a given amount of calcium sulphate material at ambient temperature; (b) placing the weighed calcium sulphate material in a moisture balance at ambient temperature; (c) drying the calcium sulphate material at temperature between 40° C. and 50° C.; (d) waiting until the weight is constant; (e) weighing the dried calcium sulphate material; (f) calculating the weight gain between (a) and (e), the weight gain being related to the amount of AIII phases in the calcium sulphate material.

Abstract: A gypsum-based construction material can include gypsum core including a stucco component, a siloxane component at a content of not greater than about 2.0 wt. % relative to a content of the stucco component, and a calcium hydroxide catalyst at a content of at least about 0.01 wt. % and not greater than about 0.1 wt. % relative to the content of the stucco component. The gypsum-based construction material can have a pH of at least about 7.5 and not greater than about 10.