<Li> Other metals used include chrome, gold, silver, and titanium . Titanium can be used for structural purposes, but it is much more expensive than steel . Chrome, gold, and silver are used as decoration, because these materials are expensive and lack structural qualities such as tensile strength or hardness . </Li> <P> The term "plastics" covers a range of synthetic or semi-synthetic organic condensation or polymerization products that can be molded or extruded into objects, films, or fibers . Their name is derived from the fact that in their semi-liquid state they are malleable, or have the property of plasticity . Plastics vary immensely in heat tolerance, hardness, and resiliency . Combined with this adaptability, the general uniformity of composition and lightness of plastics ensures their use in almost all industrial applications today . High performance plastics such as ETFE have become an ideal building material due to its high abrasion resistance and chemical inertness . Notable buildings that feature it include: the Beijing National Aquatics Center and the Eden Project biomes . </P> <P> Building papers and membranes are used for many reasons in construction . One of the oldest building papers is red rosin paper which was known to be in use before 1850 and was used as an underlayment in exterior walls, roofs, and floors and for protecting a jobsite during construction . Tar paper was invented late in the 19th century and was used for similar purposes as rosin paper and for gravel roofs . Tar paper has largely fallen out of use supplanted by asphalt felt paper . Felt paper has been supplanted in some uses by synthetic underlayments, particularly in roofing by synthetic underlayments and siding by housewraps . </P> <P> There are a wide variety of damp proofing and waterproofing membranes used for roofing, basement waterproofing, and geomembranes . </P>

Material used for construction of houses in india