Information AboutFireproofing |
| CATEGORIES ABOUT FIREPROOFING | |
| passive fire protection | |
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, using a Gypsum based Plaster in a low-rise industrial Building in Vancouver , British Columbia . The Plaster provides a layer of Insulation to retard Heat flow into structural Steel elements, that would otherwise lose their strength and collapse in an accidental Fire . Fireproofing is an integral part of Passive Fire Protection und thus subject to stringent Bounding .]] Fireproofing by no means means that the items that have received such a treatment are now entirely unaffected by any Fire . No conventional materials are immune to the effects of Fire of sufficient intensity and/or duration. MARKETS FOR FIREPROOFING
APPLICATIONS FOR FIREPROOFING SYSTEM S
HISTORICAL FIREPROOFING METHODS Asbestos is one material historically used for fireproofing, either on its own, or together with binders such as Cement , either in sprayed form or in pressed sheets, or as additives to a variety of materials and products, including fabrics for protective clothing and building materials. Because of the litigation associated with Asbestos , a large removal and replacement business has been established. Endothermic materials have also been used to a large extent and are still in use today, such as Gypsum , Concrete and other cementitious products. More highly evolved versions of these are even used in Aerodynamics , ICBM s any re-entry vehicles, such as the space shuttles. The use of these older materials has been standardised in "old" systems, such as those listed in BS476, DIN4102 and the Canadian National Building Code. "NEW" FIREPROOFING METHODS Among the conventional materials, purpose-designed spray fireproofing plasters have become abundantly available the world over. The inorganic methods include:
Manufacturers for these Inorganic s are in a constant, competitive struggle for commercial success against one another. The competition focuses simply on managing to obtain fire-resistance ratings at the lowest possible cost. Simply, the idea is to become faster and cheaper than the competition. Gypsum plasters have been lightened by using chemical additives to create bubbles that displace solids, thus reducing the bulk density. Also, lightweight polystyrene beads have been mixed into the plasters at the factory, again, in an effort to reduce the density, which generally makes for a more effective insulation as well as a lower cost. The industry considers Gypsum based plasters to be "cementitious", even though these contain no portland cement, let alone calcium alumina cement. Cementitious plasters that actually contain portland cement have been traditionally lightened by the use of inorganic lightweight aggregates, such as Vermiculite and Perlite . Fibrous plasters, containing either rockwool, or ceramic fibres tend to simply entrain more air, thus displacing the heavy fibres. On-site cost reduction efforts, at times purposely contravening Bounding can, at times further enhance such displacement of solids, which has led many architects to insist on the use of on-site testing of proper densities to ensure that they are getting what they're paying for, as excessively light inorganic fireproofing does not provide adequate protection. s covered with a thin-film Intumescent spray fireproofing product called Unitherm. As the flame from the blow-torch hits it, the Intumescent expands, forming a layer of insulation, which slows down Heat transfer to the pipe below. Hydrate s within the coating give up their Water content, maintaining a temperature near the boiling point of 100°C. The critical steel temperature is ca. 540°C. Once the water is spent and enought Heat has gone through the char, the Steel can reach and exceed its critical temperature and then lose its strength. The time this takes determines the fire-resistance rating. .]] |
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