What You Need to Know About Glass Recycling

As sustainability becomes a higher priority, more consumers want to know which materials can be recycled, and how to do it properly. Glass is one of the most common household materials, but not all glass is treated the same when it comes to recycling. Generally, only glass jars and bottles used for food, beverages, and cosmetics are accepted in standard recycling programs. Despite these limitations, recyclable glass is still one of the most sustainable packaging materials available. It can be melted down and reused endlessly without any loss in quality, making it ideal for sustainability efforts. Let’s explore the glass recycling process and how collected glass is transformed into new material.

Glass recycling is the process of turning used glass into new, usable products. Glass that is recycled is brought to a processing facility where it is cleaned, color sorted, and ground up into small pieces called glass cullet. This cullet is then sold to manufacturers to be melted into new glass. Glass can be recycled endlessly without losing quality, making this process one of the most sustainable options for glass waste management.

Recyclable glass must be processable by local recycling facilities. In many locations, the following types of glass are most commonly accepted:

• Food jars and containers

• Beverage bottles

• Cosmetic jars

• Green, blue, and brown colored glass

Some glass products are made with added chemicals or treated to withstand higher temperatures. These materials melt differently from standard glass, and can contaminate a recycling batch. The following types of glass typically cannot be recycled:

• Cooking equipment (Pyrex)

• Mirrors

• Ceramics (cups, vases, etc.)

• Automotive glass

Additionally, broken glass is often not accepted. Glass shards may pose safety risks for workers who handle and sort materials, making it unsafe to collect and process. Policies can vary based on location, so it is best to check with your local facility to see what glass waste management programs are available.

Creating glass from scratch requires quarrying raw materials. This process consumes significant energy, relies heavily on fossil fuels, and generates high CO2 emissions. Glass recycling helps limit these impacts by reusing existing glass, therefore reducing reliance on raw materials and conserving energy. As glass is prepared to be recycled, it is turned into small pieces called glass cullet, which is melted down to then become new glass. Cullet has a lower melting point than raw material, saving additional energy in the recycling process. 

Glass does not lose its purity throughout the recycling process. It can be reused again and again without any loss in quality, making it ideal for sustainability initiatives.

Most recycling facilities will only accept glass jars or bottles originally used for food, beverages, and cosmetics. While exact recycling procedures vary based on location, most locations follow similar guidelines to ensure that glass is safely and efficiently recycled. 

1. Clean Your Container: Glass containers should be rinsed to remove any remaining food, liquid, or product. The glass does not need to be perfectly clean, as the recycling facilities perform additional cleaning. However, a quick rinse of the glass helps prevent contamination of other recyclable materials. 

2. Remove Lids: Lids and closures should typically be removed. Many recycling facilities are unable to process mixed materials, meaning that closures such as metal caps or corks can contaminate the glass recycling system.

3. Remove Labels: Labels typically burn off during the recycling process, but removing them in advance helps keep the recycled glass cleaner and can reduce overall processing emissions.

Glass collection methods also vary by community. Some areas collect glass in curbside bins alongside other materials, while others require glass to be sorted separately or taken to a designated drop-off location. Regardless of the collection system, removing food residue, lids, and excess materials helps ensure that glass containers are fully recyclable and ready for processing.

At the recycling facility, glass goes through a series of processing steps before being made into new products.

First, the glass is cleaned and color-sorted. Sorting glass by color prevents unintended color contamination during recycling.

Once the glass is cleaned and separated, it is crushed into a sand-like material called glass cullet.

Cullet is then sold to manufacturers, who melt the glass back down to create new glass products. Glass cullet can be used for new bottles and jars, but also may be used for glass wool insulation for homes or water filtration media.

The Cary Company offers a wide range of glass jars and bottles to help you meet your sustainability goals while maintaining product integrity. If you need help, our experts are available to assist you with finding the perfect packaging for your product. Contact one of our product specialists at 630-629-6600, or email us at sales@thecarycompany.com.