Recycling glass the right way

Glass bottles and jars are among the most valuable materials in your recycling bin — but other types of glass can ruin an entire batch. Knowing the difference saves your effort and keeps the system working.

Why glass recycling is worth doing well

Glass is made primarily from sand, soda ash and limestone — abundant raw materials, but ones that require significant energy to extract, transport and melt together. When glass is recycled, the cullet (crushed recycled glass) melts at a lower temperature than virgin raw materials, which saves energy in the furnace and reduces the demand for quarrying. Unlike many materials, glass doesn't degrade through the recycling process — it can be recycled over and over again and still make perfectly good new bottles and jars.

The catch is that glass recycling is sensitive to contamination. Different types of glass — such as borosilicate cookware, tempered glass and soda-lime container glass — have different chemical compositions and melting points. Even small amounts of the wrong glass mixed into a batch can cause defects in new products, weaken containers or damage furnace equipment. This is why the rules about what goes in are strict, and worth following carefully.

What's accepted — and what commonly isn't

The types of glass accepted in standard recycling vary by location, so always check your local council or waste authority's guidance. That said, the following is broadly consistent across most kerbside and bottle-bank schemes:

Generally accepted:

• Glass bottles — wine, beer, spirits, olive oil, sauce, salad dressing, vinegar
• Glass jars — jam, pickles, pasta sauce, baby food, spreads, condiments
• Medicine and cosmetic bottles (check locally)

Commonly not accepted in standard glass recycling:

• Drinking glasses and glass tableware — tumblers, wine glasses, glass bowls. These are usually made from a different composition and contaminate recycled batches.
• Pyrex and other borosilicate ovenware — casserole dishes, measuring jugs, baking dishes. Borosilicate is heat-resistant precisely because it has a much higher melting point than container glass, making it incompatible.
• Window glass and mirror glass — these are typically float glass or coated glass, again with a different composition.
• Light bulbs — incandescent bulbs contain special glass; energy-saving bulbs may contain mercury and need separate specialist disposal.
• Ceramic and pottery — not glass at all, but often confused with it. Ceramics don't melt at normal glass-furnace temperatures.
• Glass that has been heat-treated or tempered — such as some glass cookware lids or oven doors.

Kerbside collection vs bottle banks

In many areas, glass bottles and jars are collected from your kerbside bin or box as part of your regular recycling collection. In other areas — particularly some rural districts or older schemes — glass is not collected kerbside and instead needs to be taken to a bottle bank or recycling centre.

Bottle banks are the large container-style collection points often found in supermarket car parks, community centres and recycling centres. They are sometimes separated by colour — clear (flint), green and brown (amber) — because glass sorted by colour produces cleaner recycled material for manufacturers. Not all areas do colour separation; some bottle banks accept mixed glass. Follow the signage at your local bank.

If you do have colour-separated bottle banks, it's worth sorting at home before you go — a simple habit that takes seconds. Clear glass is especially valuable because it can be used to make new clear glass; mixing coloured glass into the clear stream means it can only become green or mixed-colour cullet, which has fewer uses.

How to prepare glass for recycling

Getting glass ready is genuinely simple — there's no need to be obsessive about it. Follow these steps and your glass will be in good shape for the recycling process.

1. Empty the container completely. Pour out any remaining liquid. Tip jars upside down over the sink and let them drain. Don't put glass in the recycling with significant amounts of food or liquid still inside — it causes contamination and bad odours.
2. Give it a light rinse. A quick swill with cold water is enough for most bottles and jars. You don't need hot water or washing-up liquid for every container — just enough to remove residue. Heavily soiled jars (those with stuck-on food) benefit from a brief soak first.
3. Check what to do with the lid. Rules genuinely vary here. Some schemes accept metal lids left on; others ask you to remove them. Metal lids are often too small to be sorted by the machinery in a standard recycling facility, so in many areas they should go in general waste unless you can collect them in a tin to put in the recycling. Plastic lids should generally be removed. Check your local guidance and do what it says.
4. Leave the label on. Paper and foil labels don't need to be removed — they burn off cleanly in the furnace. Trying to scrub off labels isn't necessary and wastes water.
5. Don't crush or break it. Glass should go in whole. Broken glass is a safety hazard for waste handlers and can be harder to sort. If glass breaks accidentally, see the broken glass section below.
6. Place it gently in the bin, box or bottle bank. Toss it in carefully — glass shattering inside the collection point is still glass that needs handling safely.

Reuse glass before you recycle it

Recycling is good; reusing is better. Glass jars and bottles are durable, food-safe and airtight — qualities that make them genuinely useful around the house before they go anywhere near the recycling stream.

• Store dry foods. Glass jars are excellent for keeping pasta, rice, oats, lentils, nuts, seeds and spices fresh. They also look good on a shelf, which is a bonus.
• Use for bulk shopping. If you have a bulk or zero-waste shop nearby, you can often bring your own containers — glass jars included — to fill up on staples, cutting packaging entirely.
• Drinks and leftovers. Wide-mouth jars work well as water glasses or for storing leftover soups and sauces in the fridge.
• Propagating plants. Narrow-neck bottles are ideal for water-propagating cuttings.
• Homemade preserves. If you make jam, pickles, chutney or ferments, properly sterilised jars let you skip buying new ones.

For more ideas on giving glass a second life before it enters the waste stream, see our upcycling ideas guide.

Deposit-return schemes

A deposit-return scheme (DRS) is a system where a small deposit — typically a few pence, cents or equivalent — is added to the price of drinks sold in bottles and cans. When you return the empty container to a designated return point (often a machine in a supermarket or shop), you get the deposit back.

These schemes are well established in countries including Germany, the Nordic countries, and several US states, and are being rolled out in various other regions. Where they exist, they achieve very high return rates because the financial incentive is immediate. If your area has a DRS, using it is straightforward and genuinely effective — it keeps containers in a clean, sorted stream that's ideal for recycling.

Check whether your country, state or region has a deposit-return scheme and what containers it covers. The rules about which bottles are included (glass, plastic, cans — or all three) vary by scheme.

Broken glass and disposing of non-recyclable glass

Broken glass — whether it's a dropped wine glass, a shattered jar or a cracked baking dish — needs careful handling to protect waste collectors, household members and pets.

• Do not put broken glass loose in a recycling bin. It's a safety hazard and may not be suitable for the recycling stream anyway.
• Wrap it securely before binning. Use several layers of newspaper, a cardboard box or a paper bag, tape it closed and label it "broken glass" or "sharp" on the outside. This alerts waste handlers.
• For large pieces (broken window panes, mirrors, large ovenware), contact your local council or recycling centre. Some areas have specific guidance for flat glass; others accept it at the household waste and recycling centre (tip).
• Sweep carefully. Use a damp cloth or damp kitchen roll (not your hand) to pick up small fragments. A torch at a low angle helps reveal tiny shards on hard floors.
• For non-recyclable intact glass — drinking glasses, Pyrex, window glass you want to dispose of — the general waste bin or a trip to the household recycling centre is usually the right route. Some specialist glass recyclers accept flat glass; check locally.

Your glass recycling checklist

• Only put bottles and jars in glass recycling — not drinking glasses, ovenware or window glass.
• Empty and lightly rinse all containers before recycling.
• Check your local rules on lids — remove plastic ones, and check whether metal ones should stay or go.
• Sort by colour if your local bottle bank separates clear, green and brown glass.
• Reuse jars at home before recycling them.
• Check if your area has a deposit-return scheme for drinks containers.
• Wrap broken glass securely before putting it in the general waste bin.