Proprietary Product Significantly Improves Fiber Stiffness

While Minimizing Air Pollutants

SHANGHAI: Sept. 2, 2009 – Owens Corning (NYSE: OC), a world leader in glass fiber reinforcements and residential and commercial building materials, announced today that a technical seminar at China Composites Expo will highlight the performance of their corrosion-resistant, boron-free Advantex® glass fibers. The revolutionary reinforcement is not only stiffer than traditional E-glass, but its patented manufacturing platform also offers a significantly reduced environmental footprint. The process is fluorine free and more energy efficient, resulting in less demand for fossil fuel and emissions reductions of up to:

40 percent carbon dioxide
75 percent nitrogen oxide
40 percent sulfur oxide
90 percent particulates

The above comparison was typical for OCV plant conversions. Actual results vary from plant to plant.

“Advantex glass fibers provide a competitive advantage for our customers in China by helping them create more-durable, high-value applications for the benefit of their customers and the end-users,” said Gyeongho Kim, product and process leader, Owens Corning Composites Group. “Advantex glass provides superior corrosion resistance in any liquid or wet environment, including water and acidic or alkaline solutions.”

“As China continues to increase its commitment to sustainable development, products like durable Advantex glass fibers that have a smaller environmental footprint to manufacture, are critical to meeting those objectives,” added Kim. “Materials with long service lives are replaced less often so they need fewer raw materials and create less waste.”

While composites have long been known for excellent durability compared to standard steel and aluminum, there is now a proliferation of applications where special corrosion-resistant properties are required. Examples include flue-gas desulphurization equipment used in coal-fired power plants, underground water and sewage pipe, desalination plants and a variety of saltwater marine applications including tidal energy installations.

“Flue-gas desulphurization equipment is a perfect example of why corrosion resistance is growing in importance,” said Kim. “The equipment costs millions of dollars and is expected to run continuously to protect the environment. The cost of failure can be very high so fabricators are using state-of-the-art materials to assure reliable, long-term performance.”

In the first years the breakthrough technology was available more than 80 percent of the Owens Corning reinforcement plants were converted to Advantex glass. In 2007, the company substantially increased its composites manufacturing plants by acquiring the reinforcements businesses of Saint-Gobain. Owens Corning immediately started changing the facilities to Advantex technology. The first conversions took place in China, India, Japan and Korea.

About Owens Corning

Owens Corning is a leading global producer of glass fiber reinforcements and engineered materials for composite systems and residential and commercial building materials. A Fortune 500 Company for 55 consecutive years, Owens Corning is committed to driving sustainability through delivering solutions, transforming markets and enhancing lives. Founded in 1938, Owens Corning had sales of $6 billion in 2008 and about 16,500 employees in 30 countries. OCV™ Reinforcements, OCV™ Technical Fabrics and OCV™ Non-Woven Technologies are the three main business units that make up the Owens Corning Composite Solutions Business. The business delivers a broad range of reinforcement products that provide lightweight alternatives to steel, wood and aluminum, thereby reducing weight and improving energy efficiency. Additional information is available at <a href="http://www.owenscorning.com/" target="_blank">www.owenscorning.com</a>.