When glass products are made from recycled glass, the resulting products can be equal in quality to glass products made from quartz sand, the usual raw material  When plastics are recycled, however, the result is inevitably a plastic of a lower grade than the plastic from which it is derived
Products cannot presently be made out of plastic recycled entirely from the currently lowest commercial grade.
 Moreover, no applications have been found for grades of plastic that are lower than the currently lowest commercial grade