Detailed Product Description The emissivity rate is the key index to tell the advantages of off lin

Detailed Product Description The emissivity rate is the key index to tell the advantages of off line low-E from on line low-E reflective glass. The lower the E rate is, the more excellent the efficiency of preventing heating is. According to the national standard, the E rate of on line is below 0.25, off line is below 0.15. It is the main reason that off line low-E reflective glass is more popular in the developed countries..

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