Plastic recycle icon number 3 and 7 are the lowesest value to recycler. No. 3 is PVC, which has low recycling value, but burning will produce dioxin. As for No. 7, it includes the common transparent plastic egg cartons, which are often directly burned as garbage because recycling is not economical. How to encourage the industry to recycle them has become a huge challenge. But this is reason why we recommned not to use PVC on our production.