Glass recycling in Cape Town: endlessly recyclable

Of all the materials we recycle, glass has a special superpower: it can be recycled endlessly without losing quality. A glass bottle can become a new glass bottle again and again, forever. That makes glass one of the most sustainable packaging materials — if we keep it in the loop. Here's how glass recycling works in Cape Town and how to do it right.

Why glass is special

Most materials degrade slightly each time they're recycled. Glass doesn't. Made from abundant natural materials — mainly sand, soda ash and limestone — it can be melted and reformed infinitely with no loss of purity or strength. Recycle a bottle today and its glass could still be in circulation generations from now.

The benefits of recycling glass

• Saves raw materials. Every tonne of recycled glass (cullet) replaces virgin sand, soda ash and limestone.
• Saves energy. Recycled glass melts at a lower temperature than raw materials, cutting the energy needed to make new glass.
• Cuts emissions. Less energy and fewer raw materials mean lower carbon emissions.
• Diverts landfill. Glass is heavy and takes up valuable airspace — and never breaks down.
• Supports local industry. South Africa has a well-established glass recycling and manufacturing sector.

How glass recycling works

1. Collection. Bottles and jars are collected through buyback, drop-offs, bottle banks and collectors.
2. Sorting. Glass is sorted, ideally by colour (clear, green, brown), as colour affects how it's reused.
3. Cleaning. Labels, lids and contamination are removed.
4. Crushing. Clean glass is crushed into cullet.
5. Melting and reforming. Cullet is melted with a little raw material and formed into new bottles and jars.

How to recycle glass correctly

• Empty and rinse bottles and jars.
• Remove lids and caps (these are recycled separately as metal or plastic).
• Keep glass whole — don't pre-break it, as broken glass is dangerous for handlers and harder to sort.
• Separate by colour where possible for the best result.
• Keep it separate from other recycling streams.

What glass to recycle

Yes:

• Drink bottles (beer, wine, spirits, soft drinks)
• Food jars (jam, sauces, pickles)

No (different glass types that contaminate the stream):

• Window and mirror glass
• Drinking glasses, Pyrex and ovenware
• Light bulbs and fluorescent tubes
• Ceramics and crockery

These have different compositions and melting points and shouldn't go in with bottle-and-jar glass.

Reuse before recycling

Glass is also wonderfully reusable. Before recycling, consider reusing jars and bottles for storage, preserving, or crafts. Returnable bottles — where a deposit system exists — are reused many times before recycling, which is even better than recycling each time.

The weight factor

Glass is heavy, which has two implications. First, it builds weight quickly at buyback, though its per-kilogram value is lower than lighter materials like aluminium. Second, transport matters — moving heavy glass efficiently is part of making its recycling viable. Bottle banks and collection points help aggregate it economically.

A material worth keeping in the loop

Glass recycling is a near-perfect example of the circular economy: an infinitely recyclable material that saves energy and resources every time it goes around. By keeping bottles and jars out of landfill — where they'd sit forever — and back in the loop, we conserve resources and cut emissions indefinitely.

So rinse those bottles and jars, keep them whole, sort by colour, and send them back into the endless loop. To recycle glass and your other materials, find your nearest WasteGo Green point.