Abstract A container protective against high temperature of restricted duration is formed of a mixture of plaster of paris containing incombustible reinforcing filler, such as glass fibers, and/or insulating filler, such as glass spheres; and a particulate inorganic hydrate, such as magnesium sulphate, which may have a water-insoluble coating. It may also contain an infrared opacifier, such as chromium oxide. The container cover is preferably stepped, to eliminate a direct radiation path between the cover and the container; and the stepped seat or the stepped edge of the cover may be covered with a fusible incombustible material, such as a glass cloth of suitable melting point, to seal the joint between cover and container in the existence of high temperature. The wall structure may be graded, having higher melting filler and reinforcement at the exposed face, and lower melting filler at the interior portions.
In a high-temperature-resistant container having an opening into its interior which opening is closable by a cover which when closed forms an interface between surfaces of the container and of the cover, the improvement comprising a facing affixed to a surface at the interface, which facing is a cloth of fibers of a glass hard at normal ambient temperature and having a softening point below the said high temperature.
Claim 2
Dependent Claim
69 words
In a high-temperature-resistant container having an opening into its interior which opening is closable by a cover which when closed forms an interface between surfaces of the container and of the cover, the improvement comprising a facing affixed to a surface at the interface, which facing is a cloth of fibers of a glass hard at normal ambient temperature and having a softening point below the said high temperature.
Claim 3
Dependent Claim
30 words
The improvement claimed in claim 1 in which the therein said container and cover are formed of a composition comprising gypsum and therein dispersed particles of a hydrated inorganic salt.