One possible option involves a so-called "refuge floor" at higher levels with extra structural or fire resistance.

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Panels put into Lakanal House in south-east London, which caught fire in 2009, had four-and-a-half minutes of fire resistance.

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The company has also devised molecules for fire retardation and mold resistance.

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Both have been called out for their roles in the housing bubble but their absence during much of the implementation of the financial overhaul will further light a fire under a growing resistance to reform.

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"When an army patrol meets resistance and takes fire from a town or village it is assumed that the entire town is hostile and it is subsequently destroyed, " the 1982 document states.

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Often, when models for buildings are developed, material resistance to blast pressure and fire are unknown, as is the lifetime of materials, microstructure and stresses.

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But Microsoft has barely moved the needle in the tablet space, where Apple still rules the roost, and only a simpler and less expensive device like Amazon's Kindle Fire has been able to put up much resistance.

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They ran into Iraqi resistance, including rocket-propelled grenades and heavy small-arms fire.

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