This type of glass is specially made to increase strength and heat resistance making it a great option for bakeware. However, unlike other types of glass where taking a little chip out of it won’t ruin the dish, with tempered glass, if this happens, the whole dish may break into those tiny chunks.
This types of glass are the most resistant to thermal shock, meaning it can have a huge change in temperature without breaking. For example, for some types of glass, if you take it out of the oven and immediately put cold water on the dish, it will shatter.
This type of glass is also very resistant to corrosion making it perfect for backyard experiments. Soda-lime glass gained popularity because it can be reheated and reformed tons of times which makes recycling it and forming it into things super easy.
This type of glass is durable and can sustain very high temperatures. Ceramics can be exposed to higher temperatures than other kinds of glass and it’s pretty much immune to thermal shock.
Pyrex is usually made of tempered glass which gives it strength and heat resistance. Even their small food storage containers are oven safe which means your leftovers can be warmed right in the oven.
Pyrex is well known for its glass storage container and is a great option for food prepping or, if you’re like me, cooking a big meal and saving the leftovers. One thing to keep in mind if you use Pyrex is that it’s important to check your bakeware regularly for any chips or scratches as this can compromise the integrity of the glass.
The lids that are included with the dishes are made out of different material and are really only meant to be used as a cover after your food has been cooked. This is thermal shock at it’s finest and could cause your bakeware to break in a very glorious fashion.
Because Anchor Hocking dishes are made of tempered glass, also make sure you inspect your pieces for any cracks or damage before using them. With tempered glass, the smallest crack can cause the whole piece to shatter if exposed to heat or cold.
Next up, we’ll briefly cover 3 key ways you can protect your glass bakeware. Thermal shock occurs when there is a rapid change in the temperature of an object.
Such as taking a dish straight from the freezer and putting it into a hot oven. This shock can cause cracks, chips, and in some cases, complete breakage of your glass dish.
These things can also occur if you expose your glassware to a direct heat source such as a broiler or a stove top. To avoid thermal shock from happening, make sure your dish is around room temperature before placing it in the oven or into the fridge or sink.
In other words, don’t use things that will cause scratches or damage to your glassware such as SOS pads or something similar. The best way to get baked-on food out of bakeware is to soak the dish in hot soapy water for a couple of hours and then wash it normally.
This depends on the brand and the type of damage, but hey, it’s worth checking! In general, you shouldn’t put a regular drinking glass in the oven.
The key thing is to avoid temperature shocks (which will cause the glass to shatter). Ovenproof dinnerware pieces have notations such as oven safe or pictures of ovens on the bottoms.
If you see wavy lines and a temperature below 300 degrees Fahrenheit, the bowl can be kept warm in a low-temperature oven, but should not be used for baking food. It has been tested to withstand temperature changes of up to 1000-degrees Celsius, which is the equivalent to 1,832 degrees Fahrenheit.
Yet, ordinary glass would easily shatter if exposed to that extensive level of high temperature. Stainless steel handles are oven safe to 500 °F (260 °C) Phenolic resin (Bakelite) parts to 350 °F (175 °C) Silicone parts to 400 °F (204 °C) 100% ceramic and cast iron will suit very high oven temperatures.
Glass plates, unless they are specifically labeled as oven safe or microwave safe, pose a risk of injury if heated. The key thing is to avoid temperature shocks (which will cause the glass to shatter).
If the recipe calls for baking a food item at 400 degrees, Pyrex glass cookware is safe to use in an oven preheated to that temperature. If the stress is too extreme, the bowl’s structure will fail, causing a spectacular shattering effect.
Some consumers have had incidents of glass bakeware shattering in the oven or when it was placed on the counter to cool. Though the number of reported incidents is small compared to the millions of glass bakeware sold in the U.S. and Canada, there certainly is cause for concern and consumers should take steps to minimize the risk.
One of the original ingredients used in the manufacture of glass bakeware is borosilicate. According to the Anchor Hocking site, the change to soda lime (from borosilicate) was made about thirty years ago in an effort to make their bakeware safer. According to Anchor Hocking, soda lime glass is also more resistant to breakage when it comes into contact with hard surfaces or sharp utensils.
So the switch in materials was justified for safety reasons and both manufacturers stand by claims that their bakeware is safe to use. You can read the full report, but in short, bakeware manufactured in the U.S. was more prone to shattering than those made in other countries, under certain conditions.
Here are some general tips for safe use of glass bakeware and follow links for specific instructions for Anchor Hocking or World Kitchen Pyrex brand products. The Pyrex Use & Care guidelines state that Pyrex glassware can be used for warming, cooking, baking, and reheating food in microwave ovens as well as preheated standard and convection ovens.
If your Pyrex is in the fridge or freezer, allow it to come to room temperature before you put it in the oven. Also, never use Pyrex glassware on top of the oven, e.g. on ceramic or induction cook tops or burners.
In response to a customer’s question, the company’s consumer care department replied that the glassware has no maximum temperature so long as you preheat the oven before putting it inside. If you bought a regular Pyrex dish, it is designed only for kitchen use.
If you are careful when using your Pyrex, there is no reason it will shatter inside the oven or on an open stove. Instructions from the company forbid you from adding liquid to hot Pyrex, not to put it directly on the countertop, sink, or metal surface, not to put it on a cool or wet surface, and not to handle it with a damp cloth.
Don’t use your Pyrex for cooking dishes that need high heat techniques. Avoid placing your hot Pyrex on top of the metal eyes of your open stove.
Make sure that the cloth or oven mitt you are using to handle hot Pyrex is thoroughly dry. You don’t want to suffer burns because of holding hot glassware with wet gloves or cloth.
Don’t use Pyrex to cook, broil, heat, or grill food on a stove top or toaster oven. If you need to cook food straight from the freezer, start by adding some liquid to the glassware.
This technique will cause the frozen fluids from the food to thaw and get to room temperature. It will also prevent the frozen food from subjecting the glassware to sudden temperature changes.
As the oven is preheating, its gas burner or heating element will be working at full power. In an electric oven, a huge amount of radiant heat is generated.
Therefore, if you put Pyrex glassware inside a cold oven and turn it on, the radiating heat will make some parts of the glassware hot as the oven continues to heat up. If you preheat the oven before putting in the Pyrex glassware, the radiant heat will make some of its part hot.
Most of these newer machines have preheating buttons to make it easier for you not to forget. As long as you follow the Pyrex safety instructions, you won’t experience this accident.
If Pyrex shatters or if you accidentally break it, pray that you are wearing shoes and oven mitts. In other words, you should be ready for anything that would happen when you are working with Pyrex glassware, particularly if you place it in a running oven.
Carefully pick up the broken pieces of glasses with a tong or something similar. Collect the shards in a pan and then put them all in a suitable waste bag.
After cleaning the oven, stove, or floor, inspect the rest of the room for stray glass shards. Don’t put a hot Pyrex dish directly on a cool or wet metal surface or a countertop.
Put it first on a dry potholder or cloth, a cooling rack, or a wooden trivet. Don’t use Pyrex glassware on a stove top with an electric burner or an open flame, a barbecue grill, a toaster oven, or broiler.
Never use Pyrex to heat foods in brown paper bags or wrappers. Let Pyrex cool down at room temperature before placing it in the freezer or immersing it in water.
This technique will prevent any sudden changes in temperature that may happen as the food releases fluids. To underline the need and if you want to enjoy the service of your Pyrex for a long time, follow the Safety & Usage instructions issued by the company.
Somewhere along the line, the Pyrex glass changed to no longer be resistant to thermal shock. This type of glass made Pyrex kitchenware thermal shock resistant.
In 1998, Corning sold its Pyrex brand to World Kitchen, LLC. The company’s Use & Care guidelines state that Pyrex glassware can be used for warming, cooking, baking, and reheating food in preheated standard and convection ovens, including microwave ovens.