Is Lock and Lock Microwave-Safe
What to know

Is Lock and Lock Microwave-Safe?

What is LocknLock and what do they have to do with being microwave-safe or not? Incidentally, LocknLock or Lock&Lock is a company that produces glassware so it’s perfectly valid to ask whether their products can be safely used with a microwave or not.

Some bakeware or glassware can shatter when reaching certain temperatures too fast or even while being used as intended, inside the oven. Thermal shock happens when the bakeware reaches its temperature threshold or if it’s super hot then it suddenly drops in temperature.

This results in pressure cracks and whatnot. So is Lock & Lock microwave safe or not? Is its plastic, glassware, and ceramic containers with air-tight lids safe to microwave?   Keep on reading to find out.

Is Lock & Lock Microwave-Safe or Not?

Yes. Lock&Lock Classic, Krystal, glassware, and ceramics also features dishwasher-safe and microwave-safe guarantees on top of being safe to use inside ovens for baking and cooking. They’re one of the original oven-safe containers, at that, along with Pyrex.

They’re essential to baking things safely inside the oven, reheating meals, or even cooking fresh new cuisine. Each Lock & Lock container piece, from the glassware dish to its lid, is safe for use with the dishwasher, freezer, and microwave as well as standard oven unless specifically told otherwise.

It’s made of borosilicate glass and it can go inside a hot oven with temperatures of up to 400°C or 750°F. It can take the hottest temperatures way beyond what’s needed to bake a cake.

Is Lock and Lock Microwave-Safe
Is Lock and Lock Microwave-Safe

Is Lock & Lock Classic Microwave-Safe in Particular?

Lock & Lock Classic -plastic containers offer air-tight and liquid-tight containment of leftover food or transportable freshly cooked meals. They’re FDA-approved when it comes to being microwaved for sure. They’re essential for food storage and reheating.

The BPA-free containers can take microwave radiation fine as long as you don’t accidentally damage or break them, but that goes for any plastic container. With that said, they’re amazingly durable and they allow you to prepare them straight from the freezer to the microwave oven.

Just don’t forget to undo the container’s airtight lock before microwaving to prevent pressure buildup and food explosions inside your microwave when push comes to shove. The plastic line of containers aren’t bakeware and not ovens-safe though.

The Krystal Line of Containers are also Microwave-Safe

They include the Krystal line containers that offer glass-like transparent plastic as opposed to the standard semi-translucent offerings of the Classic line. They’re made of Tritan TM plastic and feature amazing stain resistance when push comes to shove.  They’re also microwaveable and BPA-free.

Both lines can even serve as containers for dry food to boot. They’re not traditional oven-safe though. That’s Lock and Lock Ceramic or Glassware. They’re mostly designed to be microwave reheatable. They can also take the rigors of being washed in the dishwasher without breakage as well.

Also, undo the airtight lock of the lid when microwaving the Krystal line of containers. Just allow the lid to sit on top of the container or place it slightly ajar to allow air and steam out of the container when being microwaved.

Lock & Lock Glassware is Safe for Use in Various Things

Lock & Lock is safe for use with a traditional oven, microwave oven, dishwasher, and freezer. To be more specific, you can put your food in the fridge or freezer then warm it up in your microwave oven or standard oven without thawing it in room temperature first, thus cutting down on prep time.

This makes the Lock and Lock glassware the practical solution when you need to make food for your breakfast, lunch, or dinner. Moreover, it allows you to have a portable lunch container for picnics or leftover storage after a big banquet to boot.

You can take them straight from the freezer to the oven then to the table with ease, allowing for instant consumption then storage if you still have food leftover afterwards! You can also clean them up in a jiffy with their dishwasher-safeness as well.

See more: Can You Microwave Glass?

What about Lock & Lock Ceramic?

As for Lock and Lock ceramic containers, they’re important in terms of combining tabletop dinnerware with ceramic cookware as well as leftover storage. Ceramic is even more microwave-safe than glassware because of its resistance to sudden high temperatures and microwave radiation.

Each piece of the product, from the container to the lid, is also microwave-safe, dishwasher-safe, and freezer-safe. The vitrified ceramic containers of Lock&Lock can deal with heat of up to 500°C and 932°F, making them even more resistant to thermal shock and heat changes than glassware.

The containers can be used from reheating leftovers inside the freezer to serving at your dinner table in just a few minutes or so—especially when you use the microwave. It also doubles as storage later, plus they’re easy to clean thanks to being dishwasher-safe.

What is the History of Lock & Lock?

Lock and Lock have been around since 1997. They helped revolutionize food storage containers of the non-plastic variety by using borosilicate glass and vitrified ceramic containers along with the standard plastic containers like with Rubbermaid and Tupperware (the Lock & Lock Classic).

They’re known for their resilient silicone seal and 4-locking mechanism that keeps food fresh for a longer time without you worrying about air or liquid leakage that affects freshness.

Their containers are available in two plastic types—the transparent BPA-free Krystal line and the polypropylene Classic line. This makes them handy for reheating, storage, and cooking at the same time.

What Do Lock & Lock Products Bring to the Table?

Lock and Lock products cover all bases in terms of food storage. They also come in hundreds of shapes and sizes in case you wish more variety and versatility out of your food storage needs. For example, certain containers have narrower or flatter designs allowing for better countertop or table placement.

The company basically gives you multiple options and solutions for any space-saving issues you might have. Furthermore, from across the board, all Lock and Lock containers are microwave-safe as well as dishwasher-safe and freezer-safe.

To Sum, it All Up

Lock&Lock, Lock & Lock, or Lock and Lock oven-safe containers also feature microwave-safeness because if something is oven-safe then it’s also likely microwave-safe.  This on top of them posting claims that their glassware offers a microwave-safe, oven-safe, and dishwasher-safe experience.

A microwave oven very rarely exceeds the peak heat possible from a traditional oven and it typically involves microwave-unsafe materials. They’ve tested the tempered glass to be microwave-safe and safe from thermal shock (cracking from the heat or sudden temperature change).


  1. LocknLock“,, Retrieved January 23, 2022
  2. Becky Gilhespie, “6 Reasons to Use Lock & Lock Food Storage Containers“,, July 22, 2019


Through the years, the microwave oven has become a standard appliance for all homes. It is safe to say that there is no home without a microwave oven. If you are looking for a microwave oven that best fits your needs, You find the right website.

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