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Fiber cements contain the fibers made from steel, glass, polymers, asbestos and other materials. These fibers keep the concrete from crumbling and prevent opening out of any cracks that might have formed in it.

Steel-fiber cements have been developed that can withstand impacts up to 1,000 times more energetic than those withstood by ordinary cements.

One type of fiber cement, called SIFCON (i.e. Slurry-Infiltrated Fiber-CONcrete) is especially tough and has been considered for use in missile silos.

Because it can be formed into complex shapes, researchers envision SIFCON replacing wood, cast iron, steel and fiber-reinforced plastics in a multitude of uses. SIFCON joints are being designed and tested for the parts of buildings most vulnerable to earthquakes.

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