is pyrex glassware environmentally friendly

Is Pyrex Glassware Environmentally Friendly? The Facts

Last Updated on September 12, 2023 by Krystine

Pyrex glass is generally considered environmentally friendly due to its reusable nature and lack of chemical leaching.

However, it cannot be recycled like normal glass due to its heat resistance, which is a downside.

Proper reuse and disposal are key.

Is Pyrex Glassware Environmentally Friendly? 

pyrex glassware
Image Credit: Costco

Pyrex glassware, made from borosilicate or soda-lime glass, is known for its durability and resistance to thermal shock.

Its long lifespan means fewer replacements and less waste over time.

While Pyrex is recyclable, it’s essential to separate it from regular glass due to its distinct composition.

Unlike some plastics, Pyrex doesn’t leach harmful chemicals into food, making it a safer choice.

Although its production requires significant energy, the extended use of Pyrex products can offset this initial environmental cost.

Overall, Pyrex offers an environmentally friendly alternative to single-use plastics, with the best practice being to use it for its full lifespan and recycle appropriately.

Key Points

  • Pyrex glass cannot be recycled like normal glass due to its heat-tempering
  • Pyrex plastic lids are made from polypropylene and are microwavable/dishwasher-safe
  • With reuse and proper disposal, Pyrex is an eco-friendly option vs. plastics

Our Opinion

While not perfectly recyclable, Pyrex glass is one of the better choices for environmentally conscious food storage.

We feel its reusability and inert nature outweigh the recycling issue.

Proper reuse and disposal are key to minimizing any environmental impact.

Is Pyrex Glass Recyclable?

glass recycling
Image Credit: How Stuff Works

However, while Pyrex glass has many benefits, it unfortunately cannot be recycled through standard curbside recycling programs.

Here are the key facts on recycling Pyrex glass:

  • Pyrex glass goes through a thermal tempering process that alters its melting point. This makes it incompatible with remelting with regular glass.
  • Most recycling centers cannot process Pyrex glass since their equipment is not designed to handle the high temperatures needed to melt it down.
  • Some specialized glass recycling plants can recycle Pyrex, but access to these facilities is limited.
  • Single-use Pyrex glass bottles, like those used for spices or cosmetics, often end up in landfills.

While pure Pyrex glass itself cannot be recycled, some Pyrex products do have recyclable components:

  • BPA-free plastic lids can be recycled through plastic recycling programs.
  • Replacement lids are now available in silicone, a more eco-friendly material.
  • Some Pyrex sets come with reusable silicone storage bags that are dishwasher-safe.

The good news is that Pyrex glass is reusable and durable. With proper care, Pyrex containers can be used for years to cook, store, sous vide, and freeze foods. Opting for Pyrex over single-use plastic containers is an eco-friendly choice.

How Is Pyrex Glass Made?

Pyrex glass has a unique manufacturing process that sets it apart from regular glass. Here’s an overview of how this versatile material is made:

The Pyrex glass formula contains boron trioxide, which gives Pyrex its heat resistance and durability. Additional compounds like soda lime and alumina are also added to the molten glass mixture.

After the raw materials are combined and melted into liquid glass, the mixture is cooled rapidly to form a solid sheet of glass. This rapid cooling puts the glass under tension, making it stronger and less prone to shattering.

The glass sheets then go through a thermal tempering process. They are reheated and then cooled quickly with blasts of cold air. This further strengthens the glass by creating compression forces on the surface.

Once the glass is tempered, it can be cut, molded, or pressed into various shapes like dishes, pans, and containers. Extra features like handles and spouts may also be attached.

The finished glassware is then inspected for quality control. Pieces that pass inspection are packaged and shipped out for retail or commercial use.

While the manufacturing process requires high heat, the end product is an inert, nonporous material that won’t interact with food. This makes Pyrex a safe choice for cooking and storage.

The unique thermal tempering is key to Pyrex’s durability and shatter resistance. This process creates glassware perfect for oven-to-table use.

What Chemicals Are Used to Make Pyrex?

Pyrex glassware is made from a unique formula that gives it strength and heat resistance. Here are the key ingredients:

  • Boron oxide – This chemical reduces thermal expansion, preventing the glass from expanding too much when heated. This is what gives Pyrex its resistance to thermal shock.
  • Soda lime – Soda lime glass makes up the bulk of standard glass. It provides workability and stability to the Pyrex formula.
  • Alumina – Aluminum oxide further stabilizes the glass, making it more resistant to chemical corrosion.
  • Barium oxide – Barium oxide allows Pyrex to soften at higher temperatures, enabling easier manufacturing.
  • Zinc oxide – Zinc oxide raises the melting point of the glass, contributing to Pyrex’s high heat tolerance.
  • Titanium dioxide – This whitening agent gives Pyrex its clear, transparent appearance.
  • The percentages of each compound can vary between Pyrex products. But the unique blend of these chemicals produces glassware that can safely withstand extremes of temperature, from freezer to oven. This makes Pyrex a versatile choice for cooking, baking, and food storage.

Does Pyrex Contain BPA or Other Toxins?

Pyrex glass itself contains no BPA or other toxic chemicals. Here’s a breakdown:

  • The glass is made purely from the borosilicate compounds listed above – no plastics or resins are used. So there is no risk of BPA leaching from the glass.
  • The glass formula is stable and nonporous, so it does not interact with or absorb food contents. You can safely cook, store, and reheat foods in Pyrex without chemical transfer.
  • Pyrex products are proudly BPA-free – this applies to any plastic lids, handles, or accessories too. Silicone, not BPA plastic, is used for lids and grips.
  • The glass is impermeable and shatterproof. So there’s no danger of chemicals leaking, even if the glass breaks.
  • When properly recycled, Pyrex glass poses no environmental contamination risk. It’s inert and stable.

The pure borosilicate glass formula is what makes Pyrex so versatile for cooking and storage. You get no unwanted chemical interactions with your food. Pyrex lives up to its reputation for safety and purity.

What Are Some Eco-Friendly Alternatives to Pyrex?

Beeswax Wraps

While Pyrex is an excellent eco-friendly option, here are some other reusable products to consider:

  • Glass food storage containers from brands like Anchor Hocking are made from soda-lime glass. This type can’t handle thermal shocks as well as borosilicate Pyrex but provides an affordable glass alternative.
  • Stainless steel containers are fully reusable, recyclable, and impermeable. Popular brands are Lock&Lock and ECOlunchbox. Stainless steel works for freezing, baking, and microwaving.
  • Silicone bags from Stasher and Zip Top are pliable, freezable containers. They are durable, stain-resistant, and contain no BPAs.
  • Bamboo fiber or cotton canvas bags are reusable and compostable. Brands like If You Care and Ecobags make these products.
  • Ceramic bakeware and crockery, like those from Le Creuset, are PTFE, PFOA and BPA-free. Ceramics are durable and naturally non-stick.
  • Beeswax paper wraps are reusable and compostable alternatives to plastic wrap. Many small businesses sell these online.

The eco-friendly options above provide versatility for cooking, storing, and transporting food. Reusability is key – avoiding single-use plastics makes a big environmental difference.


Why Is Pyrex Not Recyclable?

Pyrex glass goes through a thermal tempering process that alters its chemical makeup, raising its melting point. This makes it incompatible with standard glass recycling systems, which are designed to melt glass at lower temperatures.

What Are Pyrex Plastic Lids Made Of?

Pyrex plastic lids are made from polypropylene plastic. This type of plastic is microwavable and dishwasher safe.

Is Pyrex Plastic Safe?

Yes, Pyrex plastic lids are considered safe for food storage. The polypropylene plastic does not contain BPA or phthalates.

Can You Recycle Corningware?

Corningware is made from glass ceramic, which has a higher melting point than regular glass. Most curbside recycling programs cannot process Corningware. It should be taken to a specialty glass recycler if one is available in your area.


While Pyrex glass containers are very useful and safe for baking and food storage, they pose some environmental challenges when it comes to recycling. The durability that makes Pyrex glass ideal for high-heat applications also prevents it from being recycled in standard glass recycling streams. However, Pyrex glass itself is an inert material that does not leach chemicals into food. With proper reuse and disposal, Pyrex can still be considered an environmentally friendly option compared to single-use plastics.


Scroll to Top