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Knowledge Center2020-03-30T14:49:53+00:00
1006, 2020

Several important quality indicators for purchase of sunglass lenses

June 10th, 2020|Categories: Knowledge Center|

Quality requirements for sunglasses. The current sunglass standard implemented by the spectacles industry of China is QB2457-1999 Sunglasses. On the basis of the differences in luminous transmittance, the standard [...]

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