R-value (insulation) contain no trapped CFCs or HFCs (e.g., half-pound low density foams). On certain brands, twenty-year tests have shown no shrinkage or reduction in insulating value. This has led to controversy as how to rate the insulation of these products. Many manufacturers will rate the R-value at the time of manufacture; critics argue that a more fair assessment would be its settled value. The foam industry adopted the LTTR (Long-Term Thermal Resistance) method, which rates the R-value based on a 15-year weighted average. However, the LTTR effectively provides only an eight-year aged R-value, short in the scale of a building that
Advanced materials industry in China Advanced materials industry in China As an important part of the national sustainable development strategy, the development of advanced materials is advancing the competitive nature and state of the art for Chinese industry. The State has put advanced materials high on its development agenda for the next decade and listed it among the key high-tech industry sectors that would be given priority for development by the State Council. At present, the pace of building China's advanced materials industry is accelerating. Advanced materials have been key fields in China's national R&D system (National High Technology Research and Development Program (863 Program)