First of all, it is said that asking this question on Zhihu is a bit too worthy of the power of netizens. Even a professional consulting company after a detailed investigation is difficult to give an accurate answer, no matter how the answer is, there is no way to avoid subjective opinions;
Personal attitude towards this issue is that PETG will not replace PET. Looking back on history, we will find that the earlier the polymer materials appear, the less likely it is to be replaced, such as the early phenolic resin, nylon, PVC, etc., all of which are very vigorous. .
This has a certain scientific principle. The earlier it is invented, it often means that the synthesis process is simple, and the raw materials are abundant and easy to obtain. Although there will be deficiencies in performance, as long as it is not an essential defect, it is difficult to be replaced.
Take PVC as an example. There are so many shortcomings, and the total output is still among the best. In some fields, such as the cable industry, it is gradually replaced by EPDM rubber, but some new industries will try to use it, so from this point of view , PETG is not easy to replace PET;
Finally, in terms of product properties, PETG has limited advantages compared to PET. It is not a cross-generational change and has limited impact on PET. However, it may make achievements in some special fields such as optical materials. Its transparency ratio Comparable to PMMA, which is a valuable feature.
