Door is capable of bearing Up to 4 Hours.
Door shall be a minimum of 44 mm thick.
As door core, Rockwool is used to fill in cavities of steel-stiffened doors. Steel Stiffened doors are used mainly for exterior doors, where rigidity is important. They are available in varying degrees of strength and quality. While the thickness of the stiffeners can vary, the majority are made of 20 gauge steel. Heavier gauges sometimes are used, particularly on security doors. Spacing between stiffeners may vary.
The Rockwool Core Bristol use for its fire doors has service temperature of 780oC when tested in accordance to DIN 52271 for 42 mm thickness and 80kg/m3 density. Additionally, the core is water repellent, non-hygroscopic, and non-capillary.
A door with a fire-resistance rating (sometimes referred to as a fire protection rating for closures) used as part of a passive fire protection system to reduce the spread of fire and smoke between separate compartments of a structure and to enable safe egress from a building or structure.
As per below list.
Bristol Rockwool Fire Doors have qualified for the following ratings
According to BS 476 part 22 standards Integrity up to 240 minutes.
ANSI/UL10C- Up to 90 minutes, for double door