Fiber Glass market, both insulated as well as composites, is a part of the glass industry. Over the years, this industry has maintained a steady growth rate and is largely characterized as a market, where “demand exceeds supply”. In the recent years, the demand for durable, light-weight and non-corrosive components has increased and this has fuelled the growth of the fiber glass industry.

Source: http://www.prlog.org/10220302-demandsupply-imbalance-in-the-global-fiber-glass-industry-new-report-by-koncept-analytics.html

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When it comes to innovation in the window and door market, much of the recent change can be traced to the use of fiberglass as a structural and design component. Today, manufacturers are providing more fiberglass-based options as consumer awareness and acceptance of the material grows.

The look of fiberglass windows and doors rivals that of its elite competition. Fiberglass doors are increasingly detailed to mimic the appearance of their wood and steel counterparts and can be easily painted, unlike vinyl. Because of higher demand for these products in the market, several window and door manufacturers are also introducing fiberglass in their window and door products.

Source: http://articles.directorym.net/The_Might_of_Fiberglass-a907983.html

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In this economy, JELD-WEN is seeing increasing demand for its fiberglass line of exterior doors, which closely resemble wood doors and provide an elegant appearance. The company’s fiberglass doors are available in a wide variety of designs and with hundreds of glass choices; come standard with an oak, alder or mahogany wood grain; and a smooth option that can be painted. Fiberglass also saves on maintenance costs because it’s a durable, long-lasting material that will hold up to harsh weather in most regions of the country.

Source: http://www.jeld-wen.com/pressroom/press.cfm/idpress/409

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Owens Corning, giant of the fiberglass composite industry, has planned to idle half its production lines, and close one plant in Amarillo, TX as company spokesman Scott Dietz says "the demand for this glass fiber that is used in other products has significantly declined."