Glass is endlessly recyclable. The most common products made from cullet can be reborn, without sacrificing purity. Recycling it also makes sense from a conservation perspective. Recycling a ton of glass saves over a ton of natural resources; every 10 percent of cullet used in manufacturing translates to about 3 percent less energy cost.
The practice makes sense for manufacturers dependent on the commodity. The container and fiberglass industries collectively purchase 3.2 million tons of recycled glass annually, according to the Glass Packaging Institute (GPI).
But the problem is recycling glass doesn’t necessarily work for MRFs. The abrasive material is hard on equipment. It breaks and it is expensive to ship. And there is, at best, spotty infrastructure to support them in this costly, labor-intensive undertaking.