Passive Fire Protection
Firestopping and fireproofing products can be ablative in nature. This can mean endothermic materials, or merely materials that are sacrificial and become "spent" over time while exposed to fire such as silicone firestop products. Given sufficient time under fire or heat conditions, these products char away, crumble, and disappear. The idea is to put enough of this material in the way of the fire that a level of fire-resistance rating can be maintained, as demonstrated in a fire test. Ablative materials usually have a large concentration of organic matter that is reduced by fire to ashes. In the case of silicone, organic rubber surrounds very finely divided silica dust (up to 380 m² of combined surface area of all the dust particles per gram of this dust). When the organic rubber is exposed to fire it burns to ash and leaves behind the silica dust with which the product started.
Read more about this topic: Ablation
Famous quotes containing the words passive, fire and/or protection:
“It is my conviction that in general women are more snobbish and class conscious than men and that these ignoble traits are a product of men’s attitude toward women and women’s passive acceptance of this attitude.”
—Mary Barnett Gilson (1877–?)
“The divinity in man is the true vestal fire of the temple which is never permitted to go out, but burns as steadily and with as pure a flame on the obscure provincial altar as in Numa’s temple at Rome.”
—Henry David Thoreau (1817–1862)
“We cannot spare our children the influence of harmful values by turning off the television any more than we can keep them home forever or revamp the world before they get there. Merely keeping them in the dark is no protection and, in fact, can make them vulnerable and immature.”
—Polly Berrien Berends (20th century)