Abstract: A gypsum-based building material containing from 1 to 25% by weight of zeolites.

Abstract: The invention concerns a projectile-resistant partition construction realized as a stand comprising on both sides a single- or multilayer plating (11, 12) with cover plates (13 to 16) and a plurality of stands (17 to 19; 51 to 53) arranged between the plating (11, 12) provided on both sides, where the plating (11, 12) is held directly or indirectly on the stands (17 to 19; 51 to 53), where furthermore bombardment plates (21 to 24) form an extensive projectile barrier (25) in the interior region of the partition construction, and where the bombardment plates (21 to 24) consist at least partly of plaster fiber materials.

Abstract: An access door has a rectangular outer frame adapted to be set in a wall and having two longitudinal sides and two transverse sides defining four corners and a rectangular inner frame congruent to the outer frame, having longitudinal and transverse sides and four corners, and dimensioned to fit within the outer frame. Hinges at corners at ends of one of the longitudinal sides hold the inner frame in the outer frame and allow pivoting of the inner frame in the outer frame generally about the one longitudinal side. Two transversely effective spring latches are provided at the other longitudinal side near ends thereof between the inner and outer frames, and two longitudinally effective spring latches are provided at the transverse sides near the other longitudinal side between the inner and outer frames.