Glass Recycling: Applications and Technologies

Glass is one of the most recyclable materials available – it can in principle be recycled indefinitely without loss of quality. In practice, what determines whether collected glass actually gets recycled, and into what, is largely a question of sorting: by colour, by contaminant level, and by particle size.

Applications of recycled glass

The most familiar use for recycled glass is as cullet for new glass containers – bottles and jars – where it can replace a significant proportion of the virgin raw materials in the furnace. But recycled glass also has applications well beyond packaging: as an aggregate in construction materials, as a component in fibreglass insulation, and in some specialist applications like abrasives and filtration media.

Integrating recycled glass into the circular economy by sector

Each of these applications has different quality requirements. Glass-to-glass recycling for food and beverage containers requires high colour purity and very low contamination, since even small amounts of certain materials (like ceramics or heat-resistant glass) can cause defects in new containers. Construction and insulation applications are typically more tolerant of mixed colours and some contamination, which means recycled glass that doesn't meet container-grade standards can still find a productive use elsewhere – provided sorting facilities can identify which stream it belongs in.

Technology for glass recycling

Sorting glass to meet these varying quality requirements depends on optical sorting technology capable of separating glass by colour and identifying contaminants like ceramics, stones and metals that are visually similar to glass but would cause problems if they ended up in the furnace. PICVISA's ECOGLASS systems are designed for exactly this kind of separation, helping recycling facilities direct glass towards the application – container-grade or otherwise – where it can be put to the best use.

Discover ECOGLASS for glass sorting