Gypsum products with high efficiency heat sink additives

An assembly of at least two gypsum panels and each gypsum panel comprises a set gypsum core disposed between two paper cover sheets,

• the set gypsum core formed from at least water, stucco, wherein the stucco is selected from the group consisting of beta calcium sulfate hemihydrate, water-soluble calcium sulfate anhydrite, alpha calcium sulfate hemihydrate, and any mixture thereof, and aluminum trihydrate, with a portion of the stucco has been replaced with the aluminum trihydrate and the aluminum trihydrate present in the amount from 2% to 10% by weight of the stucco, and wherein the ratio of the amount of added aluminum trihydrate to the amount of stucco omitted on the weight basis is about 1:1 to about 1:2, and
• the panel having a density of about 27 lb/fit3 (about 430 kg/m3) to about 37 lb/ft3 (about 590 kg/m3), and the panel effective to inhibit the transmission of heat through the assembly of said panels prepared pursuant to UL U419 procedures wherein one surface is exposed to a heat source and an opposite unheated surface includes a plurality of sensors applied thereto such that the maximum single sensor temperature on the unheated surface is less than about 415° F. at about 30 minutes elapsed time when measured pursuant to UL U419, the heat source following a time-temperature curve in accordance with ASTM standard E119-09a, and the sensors arrayed in a pattern in accordance with UL U419 procedures.