GB/T 28609-2012
ActiveOptical functional films - Polyethylene terephthalate（PET）-Determination of birefringence
光学功能薄膜 聚对苯二甲酸乙二醇酯(PET)薄膜 双折射测定方法
Application Summary AI generated
This standard specifies a test method for measuring the birefringence of polyethylene terephthalate (PET) optical functional films. It is applied in the manufacturing and quality control of optical films used in displays, polarizers, and other optical devices where precise control of optical anisotropy is critical. The method ensures consistent optical performance by quantifying the refractive index difference between the in-plane and thickness directions of the film.
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