People Are Just Finding Out About the Major Difference Between PYREX and pyrex (We Had No Idea!)

There are a lot of different kitchen items we use that tend to be synonymous with the brand name in which they come from. Slow cookers are commonly called Crock-Pots. Plastic zip-top bags are referred to as Ziplock bags. And pieces of glass cookware are typically called Pyrex dishes. However, while the Pyrex name is well-known, not all Pyrex dishes are created equal. In fact, the specific capitalization of letters used on the labels of these dishes makes a huge difference when it comes to the materials and types of dishes you are using — as well as the price!

Originally founded in 1915, Pyrex was a brand introduced by Corning Inc. as a line of clear oven-safe laboratory glassware and kitchenware. The material is a borosilicate and soda-lime glass that can handle high temperatures, and is popularly used as a material in kitchens for measuring cups, casserole dishes, and so on.

However, with the popularity of this dish over the years, Pyrex the brand had to trademark their products, given all of the knockoff options that were now crowding the market. This is also why you’ll see different label variations of Pyrex on materials sold in your store — and at different price points.

So what’s the difference?

• Products with PYREX in all uppercase letters is the real-deal bakeware made with the borosilicate glass that is high-temperature safe for ovens and microwaves. Some products will also include the Pyrex brand name (with a single capital letter) followed by a registered trademark.
• Products with pyrex in all lowercase letters refers to a trademark kitchenware that is made with a variety of materials that isn’t borosilicate and soda-lime glass, and cannot be heated in a microwave or oven.

While there is a clear distinction between the two, consumers might not be able to tell the difference when purchasing an item — especially when both logos are red with similar-looking typefaces. This has caused safety issues with the U.S. Consumer Product Safety Commission, with many safety concerns reported with shattering pyrex glasses over the years due to materials unfit for the oven.

So before placing your PYREX (or pyrex) dish in the oven, be sure to make sure it is the proper type made with a material that can handle high heat.

Buy: Pyrex®  Easy Grab 4-Piece Glass Bakeware Set, $17.98

This post originally appeared on The Kitchn. See it there: People Are Just Finding Out About the Major Difference Between PYREX and pyrex (We Had No Idea!)