由于分离塑料费力费钱，因此最划算的办法通常是对少数商品热塑性塑料予以二级循环利用 — — 其中大部分是瓶子，其收集基础设施已经建成。
Given the difficulty and expense of separating plastics, the most economically viable option is often secondary recycling of a few commodity thermoplastics – mostly bottles, for which collection infrastructure is already in place.