| 摘要 |
A steel-structured door (1), which comprises a steel door frame (2), a refractory thermal insulation, and a door panel (3) on either face of the door, one of said door panels making up an external side of the door, whereby the door has its refractory thermal insulation comprising a layer (5) composed of a gypsum material in a plane defined by the door's height and width (an XY-plane).
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